Skocz do pozycji: 1.

Tytuł:

Effect of Zr Purity and Oxygen Content on the Structure and Mechanical Properties of Melt-Spun and Suction-Cast Cu46Zr42Al7Y5 Alloy

Autorzy:

Kozieł, T.
Latuch, J.
Cios, G.
Bała, P.

Powiązania:

https://bibliotekanauki.pl/articles/352353.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

metallic glasses
bulk metallic glasses
melt spinning
suction casting

Opis:

The effect of oxygen content in zirconium on the structure and mechanical properties of the Cu₄₆Zr₄₂Al₇Y₅ alloy, in the form of melt-spun ribbons and suction-cast rods, was investigated. Two types of Zr, rod and crystal bar of different nominal purities and oxygen contents, were used to synthesize the alloy by arc melting. Rapidly solidified ribbons were produced by melt spinning and their amorphous structures were confirmed by X-ray diffractometry (XRD) and differential scanning calorimetry (DSC). Bulk samples in the form of rods were cast using a special water-cooled suction casting unit attached to the arc melting system. XRD and DSC studies proved the amorphous structure of the bulk alloy synthesized from low-oxygen Zr and partial crystallization of the same alloy for high-oxygen Zr. In both bulk samples, uniformly distributed crystalline particles were identified as yttrium oxides. Higher mean compressive strength of amorphous alloy was observed. The hardness of amorphous phase was close to 500 HV1 in both bulk alloys, while the hardness of crystalline dendritic areas, observed in the alloy synthesized from high oxygen Zr, was lower by about 50 HV1.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 2B; 1215-1219
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:

Surface modifications of clinically used metallic implants for enhancing their biocompatibility and bioactivity – a review

Autorzy:

Bacakova, L.
Liskova, J.
Stankova, L.
Kromka, A.

Powiązania:

https://bibliotekanauki.pl/articles/284504.pdf

Data publikacji:

2014

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

metallic implants
biocompatibility
bioactivity

Źródło:

Engineering of Biomaterials; 2014, 17, 125; 2-5
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:

Adhesion, growth and differentiation of human osteoblast-like cells on thermally oxidized Ti and TiNb substrates

Autorzy:

Bacakova, L.
Vandrovcova, M.
Jirka, I.
Novotna, K.
Stary, V.

Powiązania:

https://bibliotekanauki.pl/articles/285115.pdf

Data publikacji:

2013

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

osteoblasts
substrates
metallic materials

Opis:

Metallic materials are essential for construction of load-bearing bone implants, such as replacements of hip, knee and other joints. For these applications, modern materials used in advanced tissue engineering, e.g. resorbable porous or fibrous polymeric and ceramic scaffolds are mechanically insufficient, even if these materials enable the ingrowth of bone cells and bone tissue formation. Therefore, searching for new metallic materials and their surface modifications improving their biocompatibility and osseointegration is still desirable. As first metallic materials for bone implantation, AISI 316L stainless steel and Co-Cr alloys were used. In the 1950’s, the Ti-6Al-4V alloy was developed. These materials are still frequently used for construction of implants because of their relatively low price [1]. However, these materials are biomechanically incompatible with the bone tissue, because their Young’s modulus is markedly higher (110-220 GPa) than that of the bone (10-40 GPa). Implants with high stiffness take over a considerable part of load from the bone. This phenomenon, referred as “stress-shielding effect”, can then cause the bone resorption and loosening of the implant [1]. Also chemical compositions of the mentioned metallic materials limit their biocompatibility, because they contain harmful elements as V, Al, Co and Cr, which can act as cytotoxic, catabolic, immunogenic or even carcinogenic agents [2,3], and can also cause serious neurological problems [4]. Due to these adverse reactions, new types of Ti-alloys have been developed, namely low-rigidity β-type Ti alloys, containing non-toxic and non-allergenic elements (Nb, Ta, Zr etc.) and having good mechanical properties and workability [4,5]. The goal of this study was to evaluate the adhesion, growth and differentiation of osteoblast-like MG-63 and Saos-2 cells on titanium-niobium alloys after their surface modification by thermal oxidation at two different temperatures (165°C and 600°C). Pure titanium (treated at 165°C and 600°C) and polystyrene culture dishes (PS) were used as control materials. Possible immune activation of the cells was tested by the levels of TNF-alpha secreted to the cell culture media by murine macrophage-like RAW 264.7 cells cultured on the tested materials. On samples treated at 165°C, the number of initially adhered MG-63 and Saos-2 cells was on an average higher on TiNb than on Ti or PS. On day 3 after seeding, the trend of the cell numbers remained similar, with the highest cell density found on TiNb. Similar results were obtained on samples treated at 600°C, where the difference in cell number between TiNb and Ti samples became more apparent. This cell behavior could be attributed to a less negative zeta potential on TiNb samples. In samples treated at 165°C, the zeta potential of TiNb surfaces was on the average less negative than on Ti surfaces, but this difference was not significant. However, in samples treated at 600°C, this difference became much more pronounced, which was probably due to the formation of T-Nb2O5 phase on the surface of the TiNb samples. This phase was of a crystalline structure, while at 165°C, the structure of Nb2O5 was amorphous. In addition, both Ti and TiNb samples treated at 600°C contained rutile, while the samples treated at 165°C contained anatase in their surface layer. It has been shown that rutile films deposited on PEEK enhanced the adhesion and growth of osteoblasts more than anatase films [6]. This phenomenon was explained by an increase in the material surface wettability, and particularly to the presence of –OH- groups on the rutile films. The expression of collagen I and osteocalcin, i.e. an early and late marker of osteogenic cell differentiation, respectively, was higher on Ti than on TiNb samples, and this difference was more apparent in samples treated at 165°C. At the same time, no considerable immune activation of the cells on all tested samples was found. The production of TNF-α by RAW 264.7 cells was very low in comparison with cells grown in the presence of bacterial lipopolysaccharide, and also significantly lower than on untreated samples. These results indicate that TiNb substrates increased the proliferation of human bone cells, while pure Ti rather supported the cell differentiation. The effect on cell proliferation was more apparent in samples treated at the higher temperature (600°C), while the effect on cell differentiation was more pronounced at the lower temperature (165°C). None of the tested samples induce significant cell proinflammatory activation. Thus, all tested samples are suitable as carriers for bone cells; only an appropriate application (i.e., requiring either proliferation or quick differentiation of osteogenic cells) should be selected.

Źródło:

Engineering of Biomaterials; 2013, 16, no. 122-123 spec. iss.; 75-76
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Insights on the study of degradable metallic implants: irrelevance of simple immersion models

Autorzy:

Ip, W. Y.
Yuen, C.K.

Powiązania:

https://bibliotekanauki.pl/articles/284462.pdf

Data publikacji:

2010

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

metallic implants
degradation
corrosion

Źródło:

Engineering of Biomaterials; 2010, 13, no. 99-101; 2-3
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:

Metallic body foreign language - case report

Autorzy:

Kuźmińska, Magdalena
Wężyk, Aleksandra
Kołodziejczyk, Paulina
Gotlib, Tomasz
Chęciński, Piotr
Niemczyk, Kazimierz

Powiązania:

https://bibliotekanauki.pl/articles/1399934.pdf

Data publikacji:

2018

Wydawca:

Index Copernicus International

Tematy:

foreign body
language
metallic

Opis:

Probably every laryngologist in his career will face off an issue of foreign body removal. It can be problematic especially that foreign body cause the trauma of surrounding tissues or may translocate unpredictably. A space of the middle and lower throat is the most common location. Occasionally it can be located in less obviously place, which force the laryngologist to prevent more viligant diagnostic. A foreign body pounded within soft tissue of the oral cavity is the example. A case report of a metallic foreign body inherent in the tongue for more than six weeks before the final treatment is presented.

Źródło:

Polski Przegląd Otorynolaryngologiczny; 2018, 7, 2; 41-44
2084-5308
2300-7338

Pojawia się w:

Polski Przegląd Otorynolaryngologiczny

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:

The first report on characterisation of partially covered self-expandable metallic stents in esophageal cancer treatment: in vivo degradation

Autorzy:

Gołda-Cępa, M.
Włodarczyk, J.
Kużdżał, J.
Chytrosz, P.
Kotarba, A.

Powiązania:

https://bibliotekanauki.pl/articles/284546.pdf

Data publikacji:

2017

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

metallic stents
esophageal stents
biodegradation

Źródło:

Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 22
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:

Potential activation of the immune system on metallic materials for bone implants

Autorzy:

Stranavova, L.
Bacakova, M.
Novotna, K.
Bacakova, L.
Fencl, J.

Powiązania:

https://bibliotekanauki.pl/articles/285314.pdf

Data publikacji:

2012

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

bone implants
metallic materials
biomaterials

Opis:

Titanium and stainless steel are metallic materials that have been in use for a long time in orthopedics, traumatology and stomatology. These metals are strong, corrosion-resistant and biocompatible. However, metallic materials have some disadvantages in comparison with the natural bone, particularly their relatively high specific weight and toughness. For example, the Young's modulus of AISI316L stainless steel, Co-Cr alloys and Ti-6Al-4V alloy, i.e. materials frequently used for implantation into bone, ranges between 110-220 GPa, while the Young's modulus of bone tissue is 10-40 GPa [1]. In addition, these metals can release cytotoxic, allergenic and immunogenic ions, which can affect their biocompatibility [2, 3]. Implantation is a special type of transplantation process, in which the implant is inserted into the body, usually in order to replace an irreversibly damaged tissue. However, the immune system recognizes the implant as a foreign substance and attacks it with its effector mechanisms. Just as it can reject other types of transplants, the immune system can reject an artificial implant. To prevent rejection of an implant, it is important to study the potential activation of the immune system. This study has investigated the biocompatibility of samples made of pure titanium (according to quality standard ISO 5832-2) and corrosion-resistant steel (quality standards ISO 5832-1 and AISI 316L), obtained from Beznoska Ltd. (Kladno, Czech Republic), and the potential activation of the immune system by these materials. In addition to Fe, the steel samples contained C (max. 0.025 wt.%), Si (0.6 wt.%), Mn (1.7 wt.%), P (max. 0.025wt.%), S (max. 0.003 wt.%), Cr (17.5 wt.%), Ni (13.5 wt.%), Mo (2.8 wt.%), and Cu (max. 0.1 wt. %). The materials were used in the form of square samples (9x9 mm or 30x30 mm, thick¬ness 1 mm). Both the Ti samples and the steel samples were ground with SiO2. The surface of the steel samples was then treated by polishing with Al2O3 paste (grain size up to 1 um), while the surface of the Ti samples, i.e. a material not suitable for polishing, was finished by brushing using another type of Al2O3 paste with slightly larger grains. Thus, the surface of the steel samples was finally smoother and glossy, while the Ti surface was rougher and matte. For the in vitro biocompatibility tests, human osteoblast-like MG 63 cells (European Collection of Cell Cultures, Salisbury, UK) were used. The smaller samples (9x9 mm) were inserted into polystyrene 24-well cell culture plates (TPP, Trasadingen, Switzerland; well diameter 1.5 cm). Each well contained 25 000 cells (approx. 14 150 cells/cm2) and 1.5 ml of Dulbecco's Modified Eagle Minimum Essential Medium (DMEM; Sigma, USA, Cat. No. 10270-106) supplemented with 10% foetal bovine serum (FBS; Gibco, Cat. No. 10270-106) and gentamicin (40 /jg/ml, LEK, Slovenia). These samples were used for evaluating the size of the cell spreading area (day 1), and for evaluating cell shape and cell viability (days 1, 4 and 7 after seeding). The size of the cell spreading area was measured using Atlas Software (Tescan Ltd., Brno, Czech Republic). The viability of the cells was determined by the LIVE/ DEAD viability/cytotoxicity kit for mammalian cells (Invitrogen, Molecular Probes, USA). The larger samples (30x30 mm) were inserted into GAMA polystyrene dishes (diameter 5 cm; GAMA Group Joint-Stock Company, Ceske Budejovice, Czech Republic) and seeded with 300 000 cells/dish (approx. 15 300 cells/cm2) suspended in 9 ml of the above mentioned culture medium. These samples were used for evaluating the cell number on days 1, 4 and 7 after seeding, using a Beckman Vi-CELL XR Cell Analyser automatic cell counter. For the in vitro analysis of markers of osteogenic differentiation and cell immune activation, human osteoblast-like MG 63 cells (European Collection of Cell Cultures, Salisbury, UK) were used. The samples (9x9 mm) were inserted into polystyrene 24-well cell culture plates (TPP, Trasadingen, Switzerland; well diameter 1.5 cm). Each well contained 25 000 cells (approx. 14 150 cells/cm2) and 1.5 ml of Dulbecco's Modified Eagle Minimum Essential Medium (DMEM; Sigma, USA, Cat. No. 10270-106) supplemented with 10% foetal bovine serum (FBS; Gibco, Cat. No. 10270-106) and gentamicin (40 jg/ml, LEK, Slovenia). The cells were cultured for 1, 4, or 7 days at 37°C in a humidified atmosphere of 5% of CO2 in the air. On day 4 after seeding, the medium was changed; one half of the samples contained standard medium DMEM with 10% foetal bovine serum and gentamicin (40 jg/ml) mentioned above, and the second half contained osteogenic medium, i.e. the standard medium further supplemented with ß-glycerophosphate, L-glutamin, ascorbic acid, dihydroxyvitamin D3, dexamethason, 10% foetal bovine serum and gentamicin (40 jg/ml). Using an Enzyme-Linked ImmunoSorbent Assay (ELISA), we measured the concentration of the Inter¬cellular Adhesion Molecule-1 (ICAM-1, a marker of cell immune activation) and osteocalcin (a marker of osteogenic cell differentiation). These measurements were performed in homogenates of cells on days 4 and 7 after seeding, and the concentration of both markers was measured per cell or per mg of protein. On day 7, the amount of osteocalcin was measured and compared in cells cultured in the standard and osteogenic media. We also measured TNF-а and IL- 1ß, i.e. other markers of cell immune activation. These cytokines are important mediators of the inflammatory response, and they are involved in a variety of cellular activities, including cell proliferation and differentiation. We measured the secretion of these markers into the cell culture medium in murine macrophage-like RAW264.7 cells (American Type Culture Collection, Manassas, VA). The samples (9x9 mm) were inserted into polystyrene 24-well cell culture plates (TPP, Tra- sadingen, Switzerland; well diameter 1.5 cm). Each well contained 30,000 (approx. 16 980 cells/cm2) cells and 1.5 ml of the culture medium. RAW 264.7 cells were cultured in the RPMI-1640 medium (Sigma; 10% fetal bovine serum, 40 jg/mL gentamicin). After 7 days of cultivation, the cell culture medium was collected and used for measuring the concentration of TNF-а and IL-1ß by a sandwich ELISA using commercially available kits. A mouse TNF-а kit and an IL- 1ß Quantikine ELISA kit were used for the RAW 264.7 cells. Both kits were purchased from R and D Systems (Minneapolis, MN) and used according to the manufacturer's protocol. The results indicated that the number of initially adhering MG 63 cells on day 1 after seeding was significantly lower on the titanium (5320±390 cells/cm2) and on the stainless steel (4110±370 cells/cm2) than on the control polystyrene culture dishes (7740±350 cells/cm2). However, on day 4 after seeding, the cell population density on both metallic materials became significantly higher than on the control polystyrene dishes (75200±2890 cells/cm2 on Ti and 90 870±2350 cells/cm2 on steel vs. 56440±1180 cells/cm2 on polystyrene). This suggests faster cell proliferation on both metallic materials than on polystyrene. At the same time, the cell number on the stainless steel samples was significantly higher than on the Ti samples. On day 7, the differences in the number of adhered cells on the two metals and on the control polystyrene substrate was on an average similar (from 328780±680 cells/cm2 to 362200±760 cells/cm2). The cell viability on all tested materials was almost 100% in all culture intervals. The morphology of the cells adhered on the studied materials was similar to the morphology of the cells on the control polystyrene dishes, i.e. the cells were mostly flat and polygonal, and the size of their cell spreading areas was similar on all tested materials. The cells were distributed homogeneously on the entire material surface, and on day 4 they started to form confluent cell layers. On day 4, we measured the amount of ICAM-1 by the ELISA test. This immunoglobulin molecule is typically expressed on cells of the immune system, but it is also expressed on other cell types, including MG 63, during their immune activation, e.g. by an artificial growth support. In this case, ICAM-1 molecules on cells are bound byß2-integrin receptors on inflammatory cells (for a review, see [4]). Surprisingly, titanium seemed to be more immunogenic than stainless steel, which was indicated by a higher concentration of ICAM-1 per cell and mg of protein in cells on day 4 after seeding. However, on day 7, there was no difference between the concentrations of ICAM-1 per cell and mg of protein in cells on titanium and on stainless steel. The second molecule that we measured was osteocalcin, a calcium-binding extracellular matrix glycoprotein, an important marker of the bone formation process. The concentration of osteocalcin on day 4 in the standard culture medium was higher in MG 63 cells on the titanium and stainless steel than on the control polystyrene samples. This could be explained by the fact that the metals are harder than polystyrene. It is known that harder substrates promote osteogenic cell differentiation, while softer substrates direct the cell differentiation towards neural or muscle phenotype [5]. In addition, the osteogenic differentiation was further supported by the osteogenic medium, as indicated by a higher concentration of osteocalcin in cells grown in this medium compared to cells in the standard medium on day 7 after seeding. On day 7 after seeding murine macrophage-like RAW264.7 cells on the tested materials, the concentration of TNF-а in the culture medium ranged on an average from 57.10 to 79.39 pg per 2000000 cells. The concentration of TNF-а in the medium from Ti and Fe was significantly higher than in the medium from the control polystyrene dishes. The highest value (79.39 pg/2000000 cells) was found in the medium taken from RAW264.7 cells on Ti. The second molecule that we tested was IL-1ß. No significant differences in the concentration of IL-1ß were detected in the culture medium obtained from RAW264.7 cells on all tested materials. In other words, neither type of metallic material, i.e. Ti and Fe, evoked significantly higher production of IL-1ß by RAW 264.7 cells than standard polystyrene cell culture dishes. It can be concluded that the tests of biocompatibility and immune activation confirmed that titanium and stainless are promising for construction of bone implants and for good integration with the surrounding bone tissue.

Źródło:

Engineering of Biomaterials; 2012, 15, no. 116-117 spec. iss.; 130-131
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:

The influence of modification of metallic medical implants coated multi-doped carbon layers (DLC, DLC-Si and DLC–Si/Ag) on changes on the implants surface as a result of implant - bone contact considering orthopedic screws

Autorzy:

Świątek, L.
Grabarczyk, J.

Powiązania:

https://bibliotekanauki.pl/articles/284484.pdf

Data publikacji:

2016

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

implants
metallic implants
biological properties

Źródło:

Engineering of Biomaterials; 2016, 19, 138; 36
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:

Nanocomposite coating for medical applications

Autorzy:

Długoń, E.
Markowski, J.
Plich, J.
Wiecheć, A.
Błażewicz, M.

Powiązania:

https://bibliotekanauki.pl/articles/285256.pdf

Data publikacji:

2016

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

nanocomposites
metallic implants
maxillofacial surgery

Źródło:

Engineering of Biomaterials; 2016, 19, 138; 92
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:

Effect of surface coating with palladium on hydrogen permeability of Pd33Ni52Si15 amorphous alloy membrane

Autorzy:

Prochwicz, W.
Macherzyński, W.
Paszkiewicz, B.
Stępień, Z.

Powiązania:

https://bibliotekanauki.pl/articles/173174.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

permeability
hydrogen
palladium alloys
metallic glasses

Opis:

In the paper, the effect of the surface coating with palladium on hydrogen permeation of a Pd33Ni52Si15 amorphous alloy membrane was investigated. We have measured the hydrogen flow through the melt-spun amorphous membrane covered with palladium film of 10, 20, and 30 nm in thickness. Membranes have been tested in the temperature rage 294–358 K, and at pressure fixed at 102 kPa. We investigate the role of this film thickness on the activation energy for hydrogen permeability. It seemed that a relatively thin layer of the palladium on the surface of the membrane which contains over 30% of this element, should not considerably influence the permeability of the membrane for hydrogen. The membrane hydrogen permeability is correlated to permeation activation energy: the lower activation energy is, the higher permeability is observed. The activation energy for permeation strongly depends on palladium film thickness. The rapid increase of its value was recorded when the film thickness was growing up. As the result, the increase of the film thickness suppressed hydrogen permeability. Our findings are discussed in terms of a potential barrier between the two different phases.

Źródło:

Optica Applicata; 2016, 46, 2; 173-179
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:

Viscous flow features of amorphous Zr₆₅(Ni,Pd)₃₅ alloy

Autorzy:

Spassov, T.
Stefanov, G.
Gyurov, S.

Powiązania:

https://bibliotekanauki.pl/articles/391534.pdf

Data publikacji:

2017

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa

Tematy:

metallic glass
viscosity
glass-forming ability

Opis:

Viscous flow behavior of amorphous Zr₆₅(Ni,Pd)₃₅ alloy has been studied at a heating rate of 20 K/min. The viscosity experimental results are interpreted on the basis of the free volume model. The values of the model parameters obtained are used for estimation of glass forming ability in terms of the Angell parameter, and the fracture strength of the alloys based on its correlation with the glass transition temperature. The glass transition temperature is 663 K. The alloy Zr₆₅(Ni,Pd)₃₅ possesses excellent fracture strength of about 2.28 GPa, comparable to that of stainless steels. The relatively good thermal and excellent mechanical properties make this alloy promising for preparing bulk amorphous samples.

Źródło:

Prace Instytutu Odlewnictwa; 2017, 57, 4; 327-331
1899-2439

Pojawia się w:

Prace Instytutu Odlewnictwa

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Austempering in Zamak Bath: Influence of Austempering Time and Austenitizing Temperature on Ductile Cast Iron Properties

Autorzy:

Pereira, L.
Bellé, M. R.
Seibel Júnior, L. F.
Pasini, W. M.
do Amaral, R. F.
Karlinski de Barcellos, V.

Powiązania:

https://bibliotekanauki.pl/articles/352699.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

austempered ductile iron
metallic bath
Zamak

Opis:

The combination of the austempered ductile iron mechanical properties strongly depend on the parameters used on the austempering cycle. On this study, the influence of austempering time and austenitizing temperature on the properties of a ductile iron were evaluated. A metallic bath of Zamak at 380°C was used as an austempering mean. A set of ductile iron blocks were austenitized at 900°C for 90 minutes and submitted to different austempering times in order to determine the best combination of microstructural and mechanical properties. After the definition of the time of austempering, the reduction of the austenitizing temperature was evaluated. The best combination of properties was obtained with austenitizing at 860°C and austempering during 60 minutes.

Źródło:

Archives of Metallurgy and Materials; 2019, 64, 1; 371-376
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:

Corrosion of Biocompatible Mg66+xZn30-xCa4 (x=0.2) Bulk Metallic Glasses

Autorzy:

Nowosielski, R.
Cesarz-Andraczke, K.
Sakiewicz, P.
Maciej, A.
Jakóbik-Kolon, A.
Babilas, R.

Powiązania:

https://bibliotekanauki.pl/articles/356929.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Mg-based alloys
bulk metallic glasses
amorphous structure
corrosion properties
biodegradable metallic alloys
corrosion products

Opis:

The aim of this paper was to investigate the corrosion resistance of Mg₆₆Zn₃₀Ca₄ and Mg₆₈Zn₂₈Ca₄ metallic glasses and evaluate the ability of this amorphous alloy use for medical applications as biodegradable medical implants. Taking into account the amount of Mg, Zn, Ca elements dissolved in multielectrolyte physiological fluid (MPF) from Mg₆₆+xZn₃₀-xCa₄ (x=0.2) alloys the daily dose of evolved ions from alloys components was determined. Additional goal of the paper was determination of corrosion rate (Vcorr) and amount of hydrogen evolved from amorphous magnesium alloys in simulated environment of human body fluids during 24h immersion and during electrochemical tests. Corrosion studies were done in the multielectrolyte physiological fluid (MPF) at 37°C. The amount of hydrogen evolved [ml/cm²] and corrosion rate Vcorr [mm/year] of amorphous Mg₆₆Zn₃₀Ca₄ and Mg₆₈Zn₂₈Ca₄ alloys were compared. The work also presents characterization of Mg-based bulk metallic glasses structure in the form of 2 mm thickness plates. Samples structure was analyzed by means of X-ray diffraction. Fracture and surface morphology of magnesium alloy samples were identified using scanning electron microscopy.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 2A; 807-810
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Analiza własności użytkowych kompozytów 316L+Al2O3
Analysis of functional properties of composites 316L+Al2O3

Autorzy:

Dudek, A.
Przerada, I.

Powiązania:

https://bibliotekanauki.pl/articles/285611.pdf

Data publikacji:

2013

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

kompozyty metaliczno-ceramiczne
metallic-ceramic composites

Opis:

Jednym ze sposobów zapewnienia odpowiednich własności użytkowych jest zastosowanie implantów kompozytowych, łączących wysokie własności wytrzymałościowe materiału metalicznego z biotolerancją materiałów ceramicznych. Celem pracy było wytworzenie oraz analiza własności kompozytów metalowo-ceramicznych wykonanych z mieszaniny proszków: stali austenitycznej (316LHD) oraz ceramicznego (Al2O3).
One of the methods to ensure particular functional properties is to employ composite implants which combine improved mechanical properties of metallic materials and biocompatibility of ceramic materials. The aim of this study was to develop and analyse properties of metallic/ceramic composites made of the mixture of powders: austenitic steel (316LHD) and ceramics (Al2O3).

Źródło:

Engineering of Biomaterials; 2013, 16, no. 122-123 spec. iss.; 19-21
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Bioactive silica enriched HAp coating on titanium with nanopatterned TiO2 intermediate layer

Autorzy:

Bartkowiak, A.
Zarzycki, A.
Suchanek, K.
Szaraniec, B.
Marszałek, M.

Powiązania:

https://bibliotekanauki.pl/articles/285878.pdf

Data publikacji:

2016

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

metallic implants
intermediate layers
titanium alloys

Źródło:

Engineering of Biomaterials; 2016, 19, 138; 103
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Preparation and Evaluation of Properties of Cast Metallic Foams with Regular Inner Structure

Autorzy:

Lichý, P.
Elbel, T.
Kroupová, I.
Radkovský, F.

Powiązania:

https://bibliotekanauki.pl/articles/353931.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

metallic foams
casting
microstructure
mechanical properties

Opis:

Lately we encounter still more new applications of metallic foams, as well as possible methods of their manufacture. These metallic materials have specific properties, such as large rigidity at low density, in some cases high thermal conductivity, capability to absorb energy, etc. The work is focused on the preparation of these materials using conventional casting technology, which ensures rapid and economically feasible method for production of shaped components. In the experimental part we studied conditions of casting of metallic foams with a regular structure made of ferrous and non-ferrous alloys. For thus obtained castings we evaluated the achieved microstructure and mechanical properties, which determine the possible use of these materials. The samples were subjected to compression tests, by which we investigated deformation behaviour of selected materials and determined the value of energy absorption.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 3; 1643-1646
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Interaction mechanism of non-metallic particles with crystallization front

Autorzy:

Żak, P. L.
Kalisz, D.
Rączkowski, G.

Powiązania:

https://bibliotekanauki.pl/articles/355462.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

non-metallic inclusion
solidification front
steel

Opis:

The process of steel solidification in the CCS mould is accompanied by a number of phenomena relating to the formation of non-metallic phase, as well as the mechanism of its interaction with the existing precipitations and the advancing crystallization front. In the solidification process the non-metallic inclusions may be absorbed or repelled by the moving front. As a result a specific distribution of non-metallic inclusions is obtained in the solidified ingot, and their distribution is a consequence of these processes. The interaction of a non-metallic inclusion with the solidification front was analyzed for alumina, for different values of the particle radius. The simulation was performed with the use of own computer program. Each time a balance of forces acting on a particle in its specific position was calculated. On this basis the change of position of alumina particle in relation to the front was defined for a specific radius and original location of the particle with respect to the front.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 1; 205-210
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Development of polyurethane paint metallic effect without cloud defect

Autorzy:

Pasieczyński, Ł.
Radek, N.

Powiązania:

https://bibliotekanauki.pl/articles/973003.pdf

Data publikacji:

2015

Wydawca:

Stowarzyszenie Menedżerów Jakości i Produkcji

Tematy:

metallic effect
metallic pigments
cloud defect
topcoat defects
efekt metaliczny
pigment metaliczny
defekt chmury
defekty warstwy wierzchniej

Opis:

The article presents tests results of the metallic paint system. The system consists of high solid corrosion protection primer and dual-component topcoat with a metallic gloss effect (RAL 9006). The paint system properties were examined after the conditioning period. The measurements included an adhesion test, a flexibility test, hardness test, gloss test, a corrosion resistance test and a humidity resistance test. The article focuses on “cloud” defect in metallic paints because of grain distribution in topcoat and also presents results of the product developed in our company.

Źródło:

Production Engineering Archives; 2015, 7, 2; 2-5
2353-5156
2353-7779

Pojawia się w:

Production Engineering Archives

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Mineral and chemical characteristics of metallic precipitates in selected types of steel slags, blast furnace slags and waste arising from the production of cast iron
Charakterystyka mineralogiczno-chemiczna wytrąceń metalicznych w wybranych rodzajach żużli stalowniczych, żużlach wielkopiecowych oraz w odpadach po produkcji żeliwa

Autorzy:

Wieczorek, Andrzej Norbert
Jonczy, Iwona

Powiązania:

https://bibliotekanauki.pl/articles/216893.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN

Tematy:

steelmaking slag
blast furnace slag
metallic precipitates
metallic iron
żużel stalowniczy
żużel wielkopiecowy
wytrącenia metaliczne
żelazo metaliczne

Opis:

Among the elements that compose steel slags and blast furnace slags, metallic precipitates occur alongside the dominant glass and crystalline phases. Their main component is metallic iron, the content of which varies from about 90% to 99% in steel slags, while in blast furnace slags the presence of precipitates was identified with the proportion of metallic iron amounting to 100%. During observations using scanning electron microscopy and X-ray spectral microanalysis it has been found that the form of occurrence of metallic precipitates is varied. There were fine drops of metal among them, surrounded by glass, larger, single precipitates in a regular, spherical shape, and metallic aggregates filling the open spaces between the crystalline phases. Tests carried out for: slags resulting from the open-hearth process, slags that are a by-product of smelting in electric arc furnaces, blast furnace slags and waste resulting from the production of ductile cast iron showed that depending on the type of slag, the proportion and form of metallic precipitates is variable and the amount of Fe in the precipitates is also varied. Research shows that in terms of quality, steel and blast furnace slag can be a potential source of iron recovery. However, further quantitative analyses are required regarding the percentage of precipitates in the composition of slags in order to determine the viability of iron recovery. This paper is the first part of a series of publications aimed at understanding the functional properties of steel and blast furnace slags in the aspect of their destructive impact on the components of devices involved in the process of their processing, which is a significant operational problem.
Wśród składników budujących żużle stalownicze i wielkopiecowe, obok dominującego szkliwa oraz faz krystalicznych, występują wytrącenia metaliczne. Ich głównym składnikiem jest żelazo metaliczne, którego zawartość w wytrąceniach w żużlach stalowniczych waha się w granicach od około 90 do 99%, natomiast w żużlach wielkopiecowych stwierdzono obecność wytrąceń, w których udział żelaza metalicznego wynosił 100%. Podczas obserwacji mikroskopowych przy wykorzystaniu mikroskopii elektronowej skaningowej oraz rentgenowskiej analizy spektralnej w mikroobszarach stwierdzono, że forma występowania wytrąceń metalicznych jest zróżnicowana. Wyróżniono wśród nich drobne krople metalu występujące w otoczeniu szkliwa, większe, pojedyncze wytrącenia o regularnym, kulistym kształcie oraz agregaty metaliczne wypełniające wolne przestrzenie pomiędzy fazami krystalicznymi. Badania przeprowadzone dla: żużli z procesu martenowskiego, żużli stanowiących produkt uboczny przy wytopie z łukowego pieca elektrycznego, żużli wielkopiecowych oraz odpadów po produkcji żeliwa sferoidalnego wykazały, że zależnie od rodzaju żużla udział i forma wytrąceń metalicznych jest zmienna, zróżnicowana jest również zawartość pierwiastka Fe w samych wtrąceniach. Badania dowodzą, że pod względem jakościowym żużle stalownicze i wielkopiecowe mogą stanowić potencjalne źródło odzysku żelaza. Niezbędne są jednak analizy ilościowe odnośnie do procentowego udziału wytrąceń w składzie żużli w celu określenia opłacalności odzysku żelaza.Artykuł stanowi pierwszą część cyklu publikacji ukierunkowanych na poznanie właściwości użytkowych żużli stalowniczych i wielkopiecowych w aspekcie ich niszczącego oddziaływania na elementy urządzeń biorących udział w procesie ich przetwarzania, co stanowi istotny problem eksploatacyjny.

Źródło:

Gospodarka Surowcami Mineralnymi; 2019, 35, 4; 69-84
0860-0953

Pojawia się w:

Gospodarka Surowcami Mineralnymi

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Characterization of partially covered self-expandable metallic stents for esophageal cancer treatment: in vivo degradation

Autorzy:

Chytrosz, Paulina
Gołda-Cępa, Monika
Włodarczyk, Janusz
Kuzdzal, Jarosław
El Fray, Mirosław
Kotarba, Andrzej

Powiązania:

https://bibliotekanauki.pl/articles/1844947.pdf

Data publikacji:

2020

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

metallic stents
cancer
treatment
stenty
rak
leczenie

Źródło:

Engineering of Biomaterials; 2020, 23, 158 spec. iss.; 43
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

The High Temperature Oxidation Stability of STS434L/Silicon Oxide Compacts

Autorzy:

Park, J. W.
Ko, B. H.
Jung, W. Y.
Park, D. K.
Ahn, I. S.

Powiązania:

https://bibliotekanauki.pl/articles/352481.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

high-temperature oxidation stability
metallic oxide
densification

Opis:

In order to improve the high-temperature oxidation stability, a study of 434L sintered stainless steel was focused on the effect of addition of metallic oxides to form stable oxide film on the inner particle surface. In this paper, oxidation behavior of 434L compacted parts in accordance with the addition of metallic oxides were discussed with high temperature oxidative reaction, and sintering behavior analysis under 950°C. Oxidation weight gains of 434 L have increased as a form of parabolic laws. The hightemperature oxidation resistance was improved by the mixed addition of amorphous SiO₂ and silica up to 2wt.%. The oxidation rate was decreased and kept constant after 60 hours. It was caused by the restraint succeeding oxidation due to the stable oxide formation of Cr₂SiO₄ phases on the particle surface to prevent densification and inhibition the external diffusion of Cr. High-temperature stability was confirmed by the electrical resistivity maintains the constant value of 1.3×10^-2 Ω ·cm when the silica added less than 2w/o to 1w/o A-SiO₂ added 434L.

Źródło:

Archives of Metallurgy and Materials; 2018, 63, 1; 307-313
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Analysis and Assessment of Aluminum and Aluminum-Ceramic Foams Structure

Autorzy:

Rogala, Michał
Tuchowski, Wojciech
Czarnecka-Komorowska, Dorota
Gawdzińska, Katarzyna

Powiązania:

https://bibliotekanauki.pl/articles/2201873.pdf

Data publikacji:

2022

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

metallic foam
composite foam
statistic analysis
microscope

Opis:

The paper presents an analysis of the aluminum porous structure serving as a structural material used in the automotive or marine industry. The subject of the research is the analysis of the mechanical properties of the aluminum porous structure, in particular its ability to absorb energy. The paper presents a description of the manufacturing process, quality control in the form of a statistical capture of geometric parameters of the foam made, as well as an X-ray microanalysis of the chemical composition of EPMA-EDS and the dispersion of components within the structure. In addition, results of static axial compression analysis of aluminum and composite foam specimens are presented.

Źródło:

Advances in Science and Technology. Research Journal; 2022, 16, 4; 287--297
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Chemical etching of Nitinol stents

Autorzy:

Katona, B.
Bognar, E.
Berta, B.
Nagy, P.
Hirschberg, K.

Powiązania:

https://bibliotekanauki.pl/articles/307073.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

stent
nitinol
chemical etching
metallic surface area

Opis:

At present the main cause of death originates from cardiovascular diseases. Primarily the most frequent cause is vessel closing thus resulting in tissue damage. The stent can help to avoid this. It expands the narrowed vessel section and allows free blood flow. The good surface quality of stents is important. It also must have adequate mechanical characteristics or else it can be damaged which can easily lead to the fracture of the implant. Thus, we have to consider the importance of the surface treatment of these implants. In our experiments the appropriate design was cut from a 1.041 mm inner diameter and 0.100 mm wall thickness nitinol tube by using Nd:YAG laser device. Then, the stent was subjected to chemical etching. By doing so, the burr created during the laser cutting process can be removed and the surface quality refined. In our research, we changed the time of chemical etching and monitored the effects of this parameter. The differently etched stents were subjected to microscopic analysis, mass measurement and in vivo environment tests. The etching times that gave suitable surface and mechanical features were identified.

Źródło:

Acta of Bioengineering and Biomechanics; 2013, 15, 4; 3-8
1509-409X
2450-6303

Pojawia się w:

Acta of Bioengineering and Biomechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Walidacja pian niemetalicznych w złożonym stanie odkształcenia
The validations of constitutive models for non metallic foam under complex strain state

Autorzy:

Barnat, W.
Dziewulski, P.
Niezgoda, T.

Powiązania:

https://bibliotekanauki.pl/articles/387115.pdf

Data publikacji:

2009

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

walidacja
piana niemetaliczna
validations
non-metallic foam

Opis:

W niniejszym artykule przedstawiono wyniki badań energochłonności piany niemetalicznej obciążonej przemieszczeniem. Głównym celem pracy była walidacja modelu numerycznego spienionego polichlorku winylu wraz z oceną zdolności pochłaniania energii przez podstawowy element konstrukcji energochłonnej obciążonej dynamicznie. Elementy energochłonne przebadano w KMiIS. Badania przeprowadzono na maszynie wytrzymałościowej Instron. Obciążenie realizowano przez wymuszenie kinematyczne.
In the present article, the results of investigations of energy absorption foam structures weighted down were presented. The main objective of this study was the validations of constitutive models for non metallic foam. Investigations were conducted on Dynamic Testing System INSTRON in KMiIS. The load was applied by input function kinematic.

Źródło:

Acta Mechanica et Automatica; 2009, 3, 3; 5-8
1898-4088
2300-5319

Pojawia się w:

Acta Mechanica et Automatica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Selected physical properties of extruded composites type of porous PVC-metal

Autorzy:

Tor-Świątek, A.

Powiązania:

https://bibliotekanauki.pl/articles/102054.pdf

Data publikacji:

2014

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

poly(vinyl chloride)
extrusion
fillers
metallic powders

Opis:

The article presents studies of selected physical and mechanical properties of hybrid materials type of polymer-metal. In the frame of this work modification of PVC with the iron and copper powder in amount of 0, 1.5 and 3% and blowing agent in amount of 0, 0.5, 1% was done. Extrudates in a form of pipe were tested to determine density, porosity, maximum tensile stress, stress at break, modulus of elasticity and elongation with break. The samples were also observed in a microscope. The studies have shown significant influence of the added components on the properties tested.

Źródło:

Advances in Science and Technology. Research Journal; 2014, 8, 23; 14-18
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Analysis of Agglomeration of Al2O3 Particles in Liquid Steel

Autorzy:

Kalisz, D.
Żak, P. L.
Kuglin, K.

Powiązania:

https://bibliotekanauki.pl/articles/352045.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

steel
agglomeration
non-metallic inclusion
PSG Method

Opis:

The removal of non-metallic inclusions from liquid steel is a result of co-operation of fluctuation, adhesion and agglomeration effects, with emphasis on agglomeration which plays the most important role. It is based on a few types of collisions between non-metallic particles, where turbulent collisions are most prominent. As a result of agglomeration, nonmetallic inclusions are intensely removed through flotation and increase of different dimensions of inclusions, which manifests itself with the occurrence of clusters mainly composed of Al₂O₃ precipitations. Authors investigated the agglomeration effect by making computer simulations with the use of the PSG method. The calculations were performed for a definite population of spherical particles of radius r in the steel volume. The applied calculation method allows for analyzing the dynamics of the collision process. The assumed initial number of particles remains constant, only the number of particles in specific size-groups varies. It was also revealed that the process of agglomerates formation is much faster for particles having a bigger initial radius. In the case of very small precipitations (r=1 μm) their removal through agglomeration is very difficult because the probability those collisions can take place between them rapidly decreases.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 4; 2091-2096
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Selected Aspects Related to the Applied Loads Control During Fatigue Tests of a Metallic Airframe

Autorzy:

Brzęczek, J.
Chodur, J.
Pietruszka, J.

Powiązania:

https://bibliotekanauki.pl/articles/97759.pdf

Data publikacji:

2014

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Lotnictwa

Tematy:

metallic airframe structure
full scale fatigue tests

Opis:

Service life of the PZL M28 is computed based on the results of the full-scale fatigue tests of the structure [1]. As the PZL M28 is a commuter category airplane according to the 14 CFR Part 23 and CS-23 regulations, the test objects are: (1) wing and wing load carry-through structure, (2) empennage and attached fuselage structure. Additionally, there are fatigue tests carried out for the landing gear and other selected elements including control system elements. The aircraft load carry-through structure is metallic and the cabin is unpressurized. The fatigue tests are conducted stage-by-stage. As tests progress, it is possible to extend the aircraft target service life, applying the safe life philosophy with reference to the primary components of the load carry-through structure. The article brings into attention the issue of the applied loads control in conducting fatigue tests of the metallic airframe.

Źródło:

Fatigue of Aircraft Structures; 2014, 6; 102-106
2081-7738
2300-7591

Pojawia się w:

Fatigue of Aircraft Structures

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Stress Analysis of the PZL M28’s Airframe Subjected to Repairs During Fatigue Tests

Autorzy:

Brzęczek, J.
Gruszecki, H.
Pieróg, L.
Deszcz, F.
Pietruszka, J.

Powiązania:

https://bibliotekanauki.pl/articles/97849.pdf

Data publikacji:

2014

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Lotnictwa

Tematy:

metallic airframe structure
full scale fatigue tests

Opis:

The PZL M28’s service life is determined based on the fatigue tests of the wing and wing loadscarry-through structure. During the fatigue test, the first occurrence of significance was the appearance of a in the area of the wing where loads are applied from the strut. It was demonstrated during further activities that repairs of the wing and other basic assemblies enabled, when performed at an appropriate time, the airplane’s service life to be significantly increase. In the case of each design change implemented in the airframe subject to the fatigue testing, a stress analysis of the airframe was required in order to check if local changes, i.e. local repairs, did not affect the stress level in other tested areas. This helped to avoid significant stress redistribution in the airframe after the repair, so the fatigue test was still valid for all areas of interest.

Źródło:

Fatigue of Aircraft Structures; 2014, 6; 107-112
2081-7738
2300-7591

Pojawia się w:

Fatigue of Aircraft Structures

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Selected Aspects Related to Preparation of a Fatigue Test Plan of a Metallic Airframe

Autorzy:

Brzęczek, J.
Gruszecki, H.
Pieróg, L.
Pietruszka, J.

Powiązania:

https://bibliotekanauki.pl/articles/97873.pdf

Data publikacji:

2014

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Lotnictwa

Tematy:

metallic airframe structure
full scale fatigue tests

Opis:

Service life of the PZL M28 is computed based on the results of the full-scale fatigue tests of the structure [1]. As the PZL M28 is a commuter category airplane according to the 14 CFR Part 23 and CS-23 regulations, the test objects were: (1) wing and wing load carry-through structure, (2) empennage and attached fuselage structure. Additionally, there were fatigue tests carried out for the landing gear and other selected elements including control system elements. The aircraft load carry-through structure is metallic and the cabin is unpressurized. The fatigue tests were conducted stage-by-stage. As tests progressed, it was possible to extend the aircraft target service life, applying the safe-life philosophy with reference to the primary components of the load carrythrough structure. The article brings into attention selected issues related to the fatigue tests plan preparation, with focus on wing and wing load carry-through structure test.

Źródło:

Fatigue of Aircraft Structures; 2014, 6; 88-94
2081-7738
2300-7591

Pojawia się w:

Fatigue of Aircraft Structures

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Selected Aspects Related to Preparation of Fatigue Tests of a Metallic Airframe

Autorzy:

Brzęczek, J.
Chodur, J.
Pietruszka, J.

Powiązania:

https://bibliotekanauki.pl/articles/97953.pdf

Data publikacji:

2014

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Lotnictwa

Tematy:

metallic airframe structure
full scale fatigue tests

Opis:

The basis for the computation of the service life of the PZL M28 was the results of the full-scale fatigue tests of the structure [1]. As the PZL M28 is a commuter category airplane according to the 14 CFR Part 23 and CS-23 regulations, the test objects were: (1) wing and wing load carrythrough structure, (2) empennage and attached fuselage structure. Additionally, there were fatigue tests carried out for the landing gear and other selected elements including control system elements. The aircraft load carry-through structure is metallic and the cabin is unpressurized. The fatigue tests were conducted stage-by-stage. As the tests progressed, it was possible to extend the aircraft’s target service life, applying a safe life philosophy with reference to the primary components of the load carry-through structure. This paper brings into attention selected issues related to the fatigue tests preparation (the stage following the preparation of the test plan), with focus on the wing and wing load carrythrough structure.

Źródło:

Fatigue of Aircraft Structures; 2014, 6; 95-101
2081-7738
2300-7591

Pojawia się w:

Fatigue of Aircraft Structures

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

A Study on the Electrical Characteristics and Oxidation Resistance of the STS434L-High Chrome Powder Green Compact at the High-Temperature

Autorzy:

Park, J. W.
Jung, W. Y.
Park, D. K.
Ahn, I. S.

Powiązania:

https://bibliotekanauki.pl/articles/354543.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

stainless steel
fecraloy
oxidation resistance
metallic oxide

Opis:

Metallic oxide layer of heat resistant element contributes to the high-temperature oxidation resistance by delaying the oxidation, and also has positive effect on the electrical resistivity increase. In this study, the green compacts of Fe-Cr-Al powder mixed with STS434L were oxidized at 950°C up to 210 hrs in order to consider the effect of metal oxide on the oxidation and electrical resistance. It exhibited the low oxidation resistance in case of 434L only, however it increased as the amount of Fe-Cr-Al powder in the 434L compact. The higher electrical resistivity was observed at the Fe-Cr-Al compact with and 434L powder. The metal oxides of (Fe_0.6C_0.4)₂O₃, Cr₂O₃, and Fe₂O₃ contributed to the electrical resistivity, whereas Al₂O₂ took a role of oxidation resistance.

Źródło:

Archives of Metallurgy and Materials; 2018, 63, 1; 431-435
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

A Simplified Approach for the Hydro-forming Process of Bi-metallic Composite Pipe

Autorzy:

Zheng, M.
Gao, H.
Teng, H.
Hu, J.
Tian, Z.
Zhao, Y.

Powiązania:

https://bibliotekanauki.pl/articles/355930.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

metallic pipe
composite
hydroforming
pressure
residual stress

Opis:

In this article, it aims to propose effective approaches for hydro-forming process of bi-metallic composite pipe by assuming plane strain and elastic-perfectly plastic material model. It derives expressions for predicting hydro-forming pressure and residual stress of the forming process of bi-metallic composite pipe. Test data from available experiments is employed to check the model and formulas. It shows the reliability of the proposed model and formulas impersonally.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 2A; 879-883
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Crystallization Behavior of Zr62Al8Ni13Cu17 Metallic Glass

Autorzy:

Jo, M. S.
Lee, J. K.

Powiązania:

https://bibliotekanauki.pl/articles/353070.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

metallic glass
crystallization
kinetics
amorphous
Zr-based

Opis:

The crystallization behavior has been studied in Zr₆₂Al₈Ni₁₃Cu₁₇ metallic glass alloy. The Zr₆₂Al₈Ni₁₃Cu₁₇ metallic glass crystallized through two steps. The fcc Zr₂Ni phase transformed from the amorphous matrix during first crystallization and then the Zr₂Ni and residual amorphous matrix transformed into a mixture of tetragonal Zr₂Cu and hexagonal Zr₆Al₂Ni phases. Johnson- Mehl-Avrami analysis of isothermal transformation data suggested that the formation of crystalline phase is primary crystallization by diffusion-controlled growth.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 2B; 1023-1026
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Zasobność w wybrane surowce metaliczne stref odmieszania planetarnych stopów krzemianowych i metalicznych na podstawie analizy składu chemicznego pallasytów i mezosyderytów
Wealth in selected metallic resources of planetary siliceous and metallic alloys liquation zones on the base of analyze of chemical composition of pallasites and mesosiderites

Autorzy:

Łuszczek, Katarzyna
Merkel, Jeremiasz

Powiązania:

https://bibliotekanauki.pl/articles/1033108.pdf

Data publikacji:

2018

Wydawca:

Polskie Towarzystwo Meteorytowe

Tematy:

A-type asteroid
Xk-type asteroid
metallic resources
planetary siliceous and metallic alloys liquation zones
stony-iron meteorites

Opis:

Pallasites and mesosiderites belong to stony-iron meteorites and are representative matter of planetary siliceous and metallic alloys liquation zones. Pallasites origin most probably from frontier zones of parent asteroid between iron-nickel alloy core and mantle constituted of olivine, which was destructed during collisions and impacts. Unlike mesosiderites, pallasites parent body was disrupted probably after solidification of its differentiated interior. Asteroids: 201 Penelope, 250 Bettina and 337 Devosa are considered to be parent bodies of mesosiderites, while asteroids: 246 Asporina, 289 Nenetta and 446 Aeternitas are parent bodies of pallasites. Analysis of chemical composition of mesosiderites and pallasites and their comparison with chemical composition of the Earth’s crust allowed the authors to conclude on wealth of metallic resources on their parent bodies. Both pallasites and mesosiderites and in consequence the liquation zones of siliceous and metallic alloys from which these meteorites origin, have the highest abundances of PGM (Platinum Group of Metals) and Fe, Ni, Co, Cr, Au. Mesosiderites contain from several hundred thousand times to several hundred times more precious metals than the terrestrial crust. The highest enrichment can be observed for: Ru, Os, Pt, Re and Au. Moreover, Ni, Co, Ge and Cr have much higher concentrations in mesosiderites than in the Earth’s crust. Pallasites have the highest enrichment in precious metals as well (Ru, Ir, Os, Pt, Pd and Au). The higher concentration of Re, Ni, Co, Ge and Cr in pallasites than in the terrestrial crust was also observed. The higher abundances of Fe, Ni, Co, Au and Ir in bulk composition of mesosiderites and pallasites than in composition of CI chondrites, HED meteorites and the terrestrial crust give the evidence that crustal material composed of silicates during liquation processes lost most of these elements in favor to metallic alloys. The process of migration of elements and their liquating to metallic alloys was not done completely in the zone, where mesosiderites and pallasites origin, what indicate higher abundances of Fe, Ni and Co in silicates of stony-iron meteorites than in CI chondrites, HED meteorites and terrestrial crust.
Pallasyty i mezosyderyty, należące do meteorytów żelazno-kamiennych, stanowią materię, która reprezentuje planetarne strefy odmieszania stopów krzemianowych i metalicznych. Pallasyty pochodzą najprawdopodobniej ze strefy granicznej między żelazowo-niklowym jądrem, a oliwinowym płaszczem planetoidy macierzystej, rozbitej w wyniku zderzeń i kolizji. W przeciwieństwie do mezosyderytów, planetoida macierzysta pallasytów została rozbita prawdopodobnie już po zastygnięciu jej zdyferencjonowanego wnętrza. Za ciała macierzyste mezosyderytów uważa się planetoidy: 201 Penelope, 250 Bettina i 337 Devosa, zaś pallasytów planetoidy: 246 Asporina, 289 Nenetta czy 446 Aeternitas. Analiza składu chemicznego mezosyderytów i pallasytów oraz jej porównanie ze składem skorupy ziemskiej pozwoliła autorom wyciągnąć wnioski dotyczące zasobności w surowce metaliczne ich ciał macierzystych. Zarówno pallasyty jak i mezosyderyty, a co za tym idzie strefy odmieszania stopów krzemianowych i metalicznych z których pochodzą te meteoryty, są najbardziej zasobne w platynowce oraz Fe, Ni, Co, Cr i Au. Mezosyderyty zawierają od kilkuset tysięcy razy do kilkuset razy więcej metali szlachetnych niż skorupa ziemska. Największe wzbogacenie zaobserwować można dla: Ru, Os, Pt, Re i Au. Także Ni, Co, Ge i Cr występują w mezosyderytach w koncentracjach znacznie większych niż w skorupie ziemskiej. Również pallasyty wykazują największe wzbogacenie w metale szlachetne – Ru, Ir, Os, Pt, Pd i Au. W dalszej kolejności wśród metali występujących w pallasytach w koncentracjach większych niż w skorupie ziemskiej wymienić należy: Re, Ni, Co, Ge i Cr. Większa zawartość Fe, Ni, Co, Au i Ir w uśrednionym składzie mezosyderytów i pallasytów niż w składzie chondrytów CI, meteorytów z klanu HED czy skorupie ziemskiej świadczy o tym, że przypowierzchniowe strefy ciał zdyferencjonowanych zbudowane z krzemianów podczas procesów odmieszania utraciły znaczną część tych pierwiastków na rzecz stopów metalicznych. Proces migracji pierwiastków i ich odmieszania do stopu metalicznego nie zaszedł prawdopodobnie do końca w strefach, z których pochodzą mezosyderyty i pallasyty na co wskazuje większa zawartość Fe, Ni i Co w krzemianach meteorytów żelazno-kamiennych niż w chondrytach CI, meteorytach klanu HED i skorupie ziemskiej. Także większa zawartość litofilnego Cr w stopie FeNi mezosyderytów i pallasytów niż w meteorytach żelaznych stanowi dowód na to, że nie uległ on całkowitemu odmieszaniu do stopu krzemianowego zgodnie ze swoim geochemicznym charakterem.

Źródło:

Acta Societatis Metheoriticae Polonorum; 2018, 9; 92-111
2080-5497

Pojawia się w:

Acta Societatis Metheoriticae Polonorum

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Structure and Chosen Nanomechanical Properties of Amorphous-Crystalline Laser Weld

Autorzy:

Pilarczyk, W.
Kania, A.
Babilas, R.
Pilarczyk, A.

Powiązania:

https://bibliotekanauki.pl/articles/1029767.pdf

Data publikacji:

2018-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

bulk metallic glasses
nanoindenter
surface topography
nanomechanical properties

Opis:

Zr-based bulk metallic glasses attract the attention because of their good mechanical properties and glass-forming ability. A laser welding process has been applied to increase the capability of using amorphous materials in the industry. The plates of Zr₅₅Al₁₀Ni₅Cu₃₀ alloy were produced by die pressure casting method and welded by the TruLaser Station 5004. X-ray analysis and microscopic observation provided information about the structure and morphology of the cross-section of weld on the boundary of the heat affected zone and the fusion zone. Nanohardness and reduced Young modulus of the particular heat affected zone, fusion zone, and parent material were examined with Hysitron TI950 Triboindenter and with the Berkovich indenter. The presence of the amorphous and amorphous-crystalline phases was confirmed by related tests. The detailed topographic analysis revealed that the heat affected zone demonstrated a slight roughness characteristic of the crystalline phase and a smooth surface in the fusion zone. The main value of the nanohardness of particular weld zones has the similar order of magnitude. In turn, Er value is restricted in the range of 105.76-108.80 GPa. The main goal of this work is to present the structure and chosen nanomechanical properties of the Zr₅₅Cu₃₀Ni₅Al₁₀ laser weld.

Źródło:

Acta Physica Polonica A; 2018, 133, 2; 219-221
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

The beneficial role of indigenous arbuscular mycorrhizal fungi in phytoremediation of wetland plants and tolerance to metal stress

Autorzy:

Sidhoum, Warda
Fortas, Zohra

Powiązania:

https://bibliotekanauki.pl/articles/205376.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

wetlands
phytoremediation
metal accumulation
AM fungi
metallic elements

Opis:

The potential of fi ve plants namely Atriplex halimus L., A. canescens (Pursh) Nutt., Suaeda fruticosa (Forssk. ex J.F. Gmel.), Marrubium vulgare L. and Dittrichia viscosa (L.) Greuter from two selected wetlands in northwest Algeria subjected to house and industrial effluents were examined to assess their arbuscular mycorrhizal fungal (AMF) diversity and colonization, as well as to determine their tolerance and ability in accumulating metallic trace elements (MTEs). The purpose was to investigate whether, or not, these fungi are related to metallic uptake. Arbuscular mycorrhizal association was observed in all plant species, since the dual association between AMF and dark septate endophytes (DSE) was found in roots of 80% plants species. Hence, the decreasing trend of metal accumulation in most plant organs was Zn>Cu>Pb, and the most efficient species were M. vulgare> S. fruticosa>A. canescens> D. viscosa> A. halimus. The bioaccumulator factors exceeded the critical value (1.0) and the transport factors indicated that all these species were phytoremediators. Pearson correlation showed that Cd bioaccumulation and translocation were inhibited by AMF infection; meanwhile Zn, Pb and Cd accumulation were affected by AMF spore density and species richness, DSE frequency, pH, AMF and plant host. Native halophytes showed a multi-metallic resistance capacity in polluted wetlands. M. vulgare was the most efficient in metal accumulation and the best host for mycorrhizal fungi. AMF played a major role in metal accumulation and translocation.

Źródło:

Archives of Environmental Protection; 2019, 45, 1; 103-114
2083-4772
2083-4810

Pojawia się w:

Archives of Environmental Protection

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Research of microstructure of molybden doped weldings of oil and gas pipelines

Autorzy:

Pandova, Iveta
Rimar, Miroslav
Makarenko, Valery
Vinnikov, Yuri
Mangura, Andrey
Zaborowski, Tadeusz
Aloshyn, Valentyn

Powiązania:

https://bibliotekanauki.pl/articles/2037421.pdf

Data publikacji:

2021

Wydawca:

STE GROUP

Tematy:

structure
fracture
corrosion
crystal lattice
non–metallic inclusions

Opis:

Still existing scientific, technical and technological developments to improve the quality of welded joints of metal pipe structures contain contradictions and uncertainty about the effects of alloying elements, such as molybdenum, mechanical and visco-plastic properties, as well as metallographic component joints. All this indicates the need for a systematic study of these problems for the development of rational metallurgical and technological measures to significantly improve the technological and corrosion-mechanical properties of weld metal. Metallographic studies, using laboratory equipment with high identifying ability, found that the doping of weld metal with molybdenum in the amount of 0.2-0.4% causes fragmentation of ferrite-pearlite structure, including carbides Mn and Fe, and also reduces the number and size of non-metallic inclusions – sulfides, oxides and silicates. Moreover, non-metallic inclusions have a dispersed appearance, which promotes plasticization of the structure, which directly increases the viscous-plastic characteristics and resistance of the metal joints to crack formation. Based on the results of metallographic research, the optimum content in the weld metal of the alloyed element – molybdenum, which is 0.2-0.4%, is determined.

Źródło:

Management Systems in Production Engineering; 2021, 4 (29); 274-279
2299-0461

Pojawia się w:

Management Systems in Production Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Phase Transition and Plasticity Enhancement of Ti-Cu-Based Bulk Metallic Glasses

Autorzy:

Wang, L.
Wang, X.
Zhang, G.
Sun, X.

Powiązania:

https://bibliotekanauki.pl/articles/356824.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

bulk metallic glasses
phase transition
annealing
stability
plasticity

Opis:

In this paper, we report the complex crystallization kinetics of phase transition happening in Ti-Cu-based bulk metallic glasses (BMGs), which play significant roles in the glass formation with respect to their low reduced glass transition temperatures, T_rg. The first exothermic event just occurs when annealing the BMG samples in the supercooled liquid region, leading to the Avrami exponent deviating from conventional modes affected by the residual amorphous phase. For Ti₄₃Cu₄₃Ni₇Zr₇ BMG, the plasticity can be improved by pre-annealing at a sub-T_g temperature of 623K (≈50K below T_g) for 0.5 hour, however, deteriorated by 1 hour annealing, which could be related to the change in stability of this BMG against crystallization with different pre-annealing times.

Źródło:

Archives of Metallurgy and Materials; 2018, 63, 1; 387-391
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Calculation of Assimilation Process of Non-metallic Inclusions by Slag

Autorzy:

Kalisz, D.

Powiązania:

https://bibliotekanauki.pl/articles/106919.pdf

Data publikacji:

2017

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

non-metallic inclusions
assimilation
slag
balance of forces

Opis:

This paper presents the results of calculating the phenomenon of the absorption of non-metallic precipitates in steel by slag. Calculations are made for the forces acting on the non-metallic particles in steel during the flow-out into the slag, depending on the particle radius and physicochemical properties of the liquid steel and slag. An analysis of the calculation results of capillary force acting on a particle in the vicinity of the steel-slag interface at changing surface energy values between the precipitates and slag shows that capillary force depends on the interfacial tension between the precipitates and slag only to a small degree.

Źródło:

Journal of Casting & Materials Engineering; 2017, 1, 2; 43-47
2543-9901

Pojawia się w:

Journal of Casting & Materials Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Mechanical Properties and Corrosion Behaviors of Aged Ti-4Mo-4Cr-X (X = Sn, V, Zr) Alloys for Metallic Biomaterials

Autorzy:

Lee, Kwangmin
Lee, Gunhee

Powiązania:

https://bibliotekanauki.pl/articles/355252.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

beta Ti-alloy
metallic biomaterials
aging
potentiodynamic polarization

Opis:

The purpose of this study was to investigate the mechanical properties of beta type aged Ti-4Mo-4Cr-X (X = V, Sn, Zr) quaternary alloy for use as a cardiovascular stent. Titanium (Ti) alloys were fabricated using a vacuum arc remelting furnace process. To homogenize the specimens of each composition and remove the micro segregation, all cast specimens were subjected to homogenization at 850°C for 4 h, which was 100°C higher than the β-transus temperature of 750°C. The tensile strength and elongation of the aged Ti-4Mo-4Cr-X (X = V, Sn, Zr) alloys were increased as compared to the homogenized alloys. In addition, many α/β interface boundaries formed after aging treatment at 450°C, which acted as inhibitors of strain and caused an increase in tensile strength. The elongation of Ti-4Mo-4Cr-X alloys consisting of α + β phases after aging treatment was improved by greater than 30%. Results of a potentiodynamic polarization test showed that the lowest current density of Ti-4Mo-4Cr-4Sn with1.05 × 10^-8 A/cm² was obtained. The present Ti-4Mo-4Cr-X alloys showed better corrosion characteristics as compared to the 316L stainless steel and L605 (Co-Cr alloy) cardiovascular stent alloys.

Źródło:

Archives of Metallurgy and Materials; 2020, 65, 4; 1297-1301
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

The Effect of Non-Metallic Inclusions Formed as a Result of Deoxidation on the Fatigue Strength of 15CrNi6 and 16MnCr5 Steel

Autorzy:

Lipa, S.
Sawicki, J.
Dybowski, K.
Pietrasik, R.
Januszewicz, B.

Powiązania:

https://bibliotekanauki.pl/articles/353324.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

fatigue strength
non-metallic inclusions
thermo-chemical treatment

Opis:

This paper presents the findings of fatigue strength tests of 15CrNi6 steel following low-pressure carburizing and oil quenching, subjected to cycles of one-sided three-point bending. The fatigue fractures were compared with the results of fatigue strength studies of 16MnCr5 steel following low-pressure carburizing and nitrogen quenching. The fatigue tests for 16MnCr5 steel were conducted as part of a high-cycle resonance test, with a pendular bending load. The study also involved an analysis of the effects on non-metallic inclusions in the structure on the mechanism of fatigue destruction. The inclusions were found to initiate fatigue cracks. In both cases, a similar method of a fatigue fissure initiation was observed, independent of the study method or specimen material.

Źródło:

Archives of Metallurgy and Materials; 2018, 63, 3; 1345-1350
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Theory of evanescent Bessel beams with a metallic sheet

Autorzy:

Al-Awfi, S.

Powiązania:

https://bibliotekanauki.pl/articles/173463.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

optical vortex
optical lattice
metallic sheet
surface modes

Opis:

We explain how a surface optical vortex can be created when a Bessel beam is totally reflected internally at the planar surface of a dielectric on which a metallic sheet has been deposited. A two-dimensional patterning on the surface, the strongly localized intensity distribution decays with distance vertical to the surface. The characteristics of this surface optical vortex depend on the incident beam parameters and the dielectric mismatch of the media.

Źródło:

Optica Applicata; 2013, 43, 3; 539-550
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

The role of microparticles in initiating the electric breakdown in high–voltage vacuum insulation systems

Autorzy:

Opydo, W.
Opydo, D.
Bieliński, W.

Powiązania:

https://bibliotekanauki.pl/articles/97674.pdf

Data publikacji:

2016

Wydawca:

Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej

Tematy:

high–voltage vacuum insulation systems
metallic microparticles
electric breakdown

Opis:

The paper presents the hypotheses of initiating mechanisms of the electric breakdown in vacuum insulation systems caused by small material granules, i.e. the microparticles. The microparticles detached from the parent electrode have an electric charge and move in the inter–electrode area due to the electric field. The role of a microparticle in initiating the breakdown in a vacuum insulation system depends to a considerable extent on the microparticle energy at the moment of its impact against the opposite electrode, i.e. on its velocity at the impact time. The paper presents calculation of the microparticle velocity values at the moment of the impact against the opposite electrode under the conditions existing in practice in the vacuum insulation systems. It was assumed for purposes of the calculation that the microparticles are spherical and made of copper, aluminum or iron, and are subjected to constant electric field. Minimum values of the microparticle velocity necessary to cause plastic deformation of the electrode surface in result of the impact are determined. (The calculations have been carried out with the computer program developed in C# language on the Visual Studio 2013 environment.)

Źródło:

Computer Applications in Electrical Engineering; 2016, 14; 177-186
1508-4248

Pojawia się w:

Computer Applications in Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Absorption Enhancement in Si Solar Cells by Incorporation of Metallic Nanoparticles: Improved COMSOL Numerical Study Including Quantum Corrections

Autorzy:

Kluczyk, K.
Krzemińska, Z.
Jacak, W.

Powiązania:

https://bibliotekanauki.pl/articles/1033865.pdf

Data publikacji:

2017-08

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

solar cells
solar energy harvesting
surface plasmons
metallic nanoparticles

Opis:

One of the crucial parameters affecting the solar cell efficiency is the absorption rate versus solar spectrum. Metallic nanoparticles deposited on the cell surface can mediate this process. Main mechanisms of absorption enhancement due to metallic nanoparticle plasmons were proposed: (1) the scattering of incident solar light causing increase of the optical path length inside active layer and local enhancement of the electric field; (2) near field coupling between plasmon and semiconductor and the direct generation of electron-hole pairs in the semiconductor. The field concentration effect can be described by classical electrodynamic theory, the coupling between metallic nanoparticle plasmons and band electrons in semiconductor substrate must be captured upon quantum mechanics. In this paper we took the challenge to develop fast and reliable method for calculation of device optical properties by application of COMSOL system appropriately configured to take into account these quantum effects, via the quantum modification of the dielectric function of semiconductor substrate and metallic components. The presented results indicate that the efficiency of energy transfer due to near field coupling of metallic nanoparticle plasmons with semiconductor substrate is much more effective than the absorption increase due to metallic nanoparticle plasmons scattering only.

Źródło:

Acta Physica Polonica A; 2017, 132, 2; 393-397
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Isothermal Stability and Selected Mechanical Properties of Zr48Cu36Al8Ag8 Bulk Metallic Glass

Autorzy:

Błyskun, P.
Latuch, J.
Kulik, T.

Powiązania:

https://bibliotekanauki.pl/articles/353937.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

bulk metallic glasses
isothermal stability
mechanical properties
TTT curve

Opis:

The aim of this work was to investigate the influence of isothermal annealing on the amorphous structure stability of the Zr₄₈ Cu₃₆ Al₈ Ag₈ alloy. A series of continuous heating examinations was performed on the differential scanning calorimeter in order to determine the temperature limits for isothermal annealing series where the time to crystallization was measured. The obtained results were calculated and a time-temperature-transformation diagram was created and discussed. Static compression test as well as microhardness measurements of the as-quenched samples gave a mechanical properties results supplement. The measured properties (σ_c = 1800 MPa and 614 HV0.05) are comparable to the literature results for this alloy. Fractographic observations with the scanning electron microscope were also performed in order to prove some plasticity observed during the strength tests.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 3; 1749-1753
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Effect of Cooling Rate on Mechanical Properties of New Multicomponent Fe-Based Amorphous Alloy During Annealing Process

Autorzy:

Rezaei-Shahreza, Parisa
Redaei, Hossein
Moosavi, Parisa
Hasani, Saeed
Seifoddini, Amir
Jeż, Bartłomiej
Nabiałek, Marcin

Powiązania:

https://bibliotekanauki.pl/articles/2048746.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

bulk metallic glasses
BMGs
nanocomposite
mechanical testing
fracture toughness

Opis:

Fe-based bulk metallic glasses (BMGs) have been extensively investigated due to their ultrahigh strength and elastic moduli as well as desire magnetic properties. However, these BMGs have few applications in industrial productions because of their brittleness at room temperature. This study is focused on the effect of cooling rate on the mechanical properties (especially toughness) in the Fe41Co7Cr15Mo14Y2C15B6 BMG. For this aim, two samples with the mentioned composition were fabricated in a water-cooled copper mold with a diameter of 2 mm, and in a graphite mold with a diameter of 3 mm. The formation of crystalline phases of Fe23(B,C)6, α-Fe and Mo3Co3C based on XRD patterns was observed after the partial crystallization process. To determine the toughness of the as-cast and annealed samples, the indentation technique was used. These results revealed that the maximum hardness and toughness were depicted in the sample casted in the water-cooled copper mold and annealed up to 928°C. The reason of it can be attributed to the formation of crystalline clusters in the amorphous matrix of the samples casted in the graphite mold, so that this decrease in the cooling rate causes to changing the chemical composition of the amorphous matrix.

Źródło:

Archives of Metallurgy and Materials; 2022, 67, 1; 251-254
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Graphene hydrogels with embedded metal nanoparticles as efficient catalysts in 4-nitrophenol reduction and methylene blue decolorization

Autorzy:

Żelechowska, K.
Kondratowicz, I.
Gazda, M.

Powiązania:

https://bibliotekanauki.pl/articles/779599.pdf

Data publikacji:

2016

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

graphene hydrogel
metallic nanoparticles
heterogeneous catalyst
4-nitrophenol reduction

Opis:

Synthesis and characterization of the graphene hydrogels with three different metallic nanoparticles, that is Au, Ag and Cu, respectively is presented. Synthesized in a one-pot approach graphene hydrogels with embedded metallic nanoparticles were tested as heterogeneous catalysts in a model reaction of 4-nitrophenol reduction. The highest activity was obtained for graphene hydrogel with Cu nanoparticles and additional reaction of methylene blued degradation was evaluated using this system. The obtained outstanding catalytic activity arises from the synergistic effect of graphene and metallic nanoparticles. The hydrogel form of the catalyst benefits in the easiness in separation from the reaction mixture (for example using tweezers) and reusability.

Źródło:

Polish Journal of Chemical Technology; 2016, 18, 4; 47-55
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Ocena bezpieczeństwa surowcowego Polski w zakresie surowców nieenergetycznych
Assessment of the non-energy minerals security of Poland

Autorzy:

Galos, K.
Szamałek, K.

Powiązania:

https://bibliotekanauki.pl/articles/394004.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN

Tematy:

bezpieczeństwo surowcowe
surowce metaliczne
surowce niemetaliczne
popyt krajowy
produkcja
import
minerals security
metallic raw materials
non-metallic raw materials
domestic demand
imports

Opis:

Bezpieczeństwo surowcowe jest ściśle powiązane z gospodarką krajową i międzynarodową w zakresie możliwości dostępu do źródeł surowców mineralnych (pierwotnych i wtórnych) oraz ich wykorzystania obecnie i w przyszłości. Punktem wyjścia w ocenie bezpieczeństwa surowcowego jest rozpoznanie obecnego i prognoza przyszłego zapotrzebowania gospodarki na poszczególne surowce mineralne. Dotyczy to zarówno surowców pochodzących ze złóż kopalin (surowce pierwotne), z recyklingu materiałowego (surowce wtórne), jak też z różnego rodzaju odpadów przemysłowych (mineralne surowce odpadowe). Bezpieczny, niezależny i niezawodny dostęp do surowców postrzegany jest jako przesądzający o możliwości utrzymania pozycji konkurencyjnej gospodarki danego kraju. Stąd, zgodnie z ostatnimi inicjatywami surowcowymi Unii Europejskiej, bezpieczeństwo krajów Unii Europejskiej (w tym Polski) w zakresie surowców nieenergetycznych powinno bazować na trzech filarach: zapewnieniu odpowiedniego dostępu do surowców na rynkach międzynarodowych, rozwijaniu stabilnych dostaw surowców ze źródeł własnych oraz poprawie efektywności wykorzystania surowców i promowaniu wykorzystywania surowców wtórnych i odpadowych. W artykule poddano analizie zapotrzebowanie krajowej gospodarki na poszczególne surowce nieenergetyczne (metaliczne i niemetaliczne). W odniesieniu do jego poziomu oceniono wielkość i wystarczalność krajowych zasobów kopalin do produkcji tych surowców, a także podstawowe trendy w ich krajowej produkcji. Szczególną uwagę zwrócono na strukturę uzupełniającego importu surowców nieenergetycznych, a także na przyczyny rosnącego udziału surowców importowanych w zaspokajaniu krajowego popytu na omawianą grupę surowców. Podkreślono także rosnące znaczenie surowców wtórnych i odpadowych ze źródeł krajowych w zaspokajaniu tego popytu, co należy uznać za zjawisko zdecydowanie pozytywne. Polska jest i pozostanie w najbliższej przyszłości niemal całkowicie wystarczalna pod względem zaspokajania potrzeb w zakresie surowców budowlanych oraz znacznej części surowców ceramicznych. Niestety, w zakresie surowców chemicznych, poza utrzymywaną podażą soli i siarki, skazana jest na posiłkowanie się importem. Wysoka pozycja Polski jako znaczącego producenta miedzi i srebra oraz kilku ich koproduktów (np. złoto, selen, surowce renu) oraz planowane utrzymanie produkcji cynku i ołowiu metalicznego (mimo spodziewanej w najbliższych latach likwidacji górnictwa rud Zn-Pb) przyczynia się do utrzymywania dodatniego salda obrotów surowcami metalicznymi. Nie zmieni to jednak faktu, że w zakresie pozostałych ponad 30 surowców metalicznych, a w szczególności rud żelaza, żelazostopów, aluminium metalicznego, niklu, krajowa gospodarka pozostanie całkowicie zależna od dostaw z zagranicy. Zapewnienie dostaw surowców nieenergetycznych na bazie trzech filarów europejskiej inicjatywy surowcowej na gruncie polskim wymaga w chwili obecnej opracowania nowej polityki surowcowej naszego kraju.
Minerals security is strictly related to the domestic and world economy regarding access to primary and secondary sources of such minerals, as well as directories of their current and future use. Estimation of current and perspective demand of national economy for particular types of minerals should be the starting point for assessment of minerals security. All sources of minerals supplies should be investigated: primary mineral raw materials (from deposits), secondary mineral raw materials from recycling (scraps), as well as waste raw materials from various industrial wastes. Secure, independent and stable access to mineral raw materials is a crucial factor which decides on competition position of the country's economy. So, according to the latest European Union's initiatives, non-energy minerals security of EU countries (including Poland) should be based on three pillars: assurance of appropriate access to minerals on the international market, development of their production from own sources, as well as improvement of effectiveness of minerals use with promotion of use of secondary and waste raw materials. In the paper, national economy's demand for particular non-energy minerals is analyzed. In relation to this demand, quantity and sufficiency of the domestic reserves of such minerals, as well as their production trends, are assessed. The special attention is paid on the structure of the supplementary imports of non-energy minerals, and reasons of the increasing share of imported minerals in mineral supplies which meet domestic demand. Growing importance of domestic secondary and waste raw materials in total mineral supplies is underlined as positive phenomenon. Poland is self-sufficient in case of almost all construction raw materials and the majority of ceramic raw materials. Such situation should be maintained in the coming years. Unfortunately, regarding chemical raw materials, Poland is entirely dependent on imported raw materials, except for salt and sulfur from domestic supplies. Our country is very important producer of copper, silver and their co-products (e.g. gold, selenium, rhenium). Maintaining of smelter production of zinc and lead is also planned in spite of the expected closure of the last Zn-Pb ore mine in the coming years. This is why Poland's trade balance in the area of metallic raw materials is still positive. However, Poland's economy will remain fully dependent on imports of over 30 metallic raw materials, with iron ore, ferroalloys, aluminum and nickel being the most important. Assurance of non-energy minerals supplies on the basis of three pillars of the European raw materials initiative should result in the preparation of the new minerals policy of Poland.

Źródło:

Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN; 2011, 81; 37-58
2080-0819

Pojawia się w:

Zeszyty Naukowe Instytutu Gospodarki Surowcami Mineralnymi i Energią PAN

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Potential importance of metallic resources of ordinary chondrite parent bodies

Autorzy:

Łuszczek, K.

Powiązania:

https://bibliotekanauki.pl/articles/89183.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa

Tematy:

extraterrestrial resources
metallic resources
asteroid mining
ordinary chondrite parent bodies

Opis:

Demand for metallic resources constantly increases along with technological development. One of the factors that currently raises requests for resources is extensive space exploration. Especially, the exploration that involves space colonization creates the needs for resources not only on the Earth but also on other bodies in the Solar System. For instance, resources will be required for building bases and settlements or spare parts to machines, devices and space shuttles. The high transportation costs make launching them from our planet ineffective. New and attractive places for prospecting the resources in our Solar System are bodies located in the asteroid belt, namely parent bodies of ordinary chondrites. The goal of this paper is a review of scientific and economic aspects of extraterrestrial resources associated with such bodies. Studies of meteorites combined with scientific achievements of current space mission significantly improved our understanding of the origin, structure as well as chemical and mineral composition of these bodies and processes that affected them. This knowledge is used in XXI century to set up companies aiming at asteroid mining, or production of fuel and spare pieces in space. Additionally, owing to the fact that some asteroids are on collisional course with our planet, possibilities arise for resource utilization by deflection of hazardous asteroids and setting them on circumterrestrial or circummoon orbits.

Źródło:

Mining Science; 2018, 25; 57-69
2300-9586
2353-5423

Pojawia się w:

Mining Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

Manufacturing of activated carbon using disposable coconut shells

Autorzy:

Aluvihara, Suresh
Kalpage, C. S.
Bandaranayake, P. W. S. K.

Powiązania:

https://bibliotekanauki.pl/articles/1031548.pdf

Data publikacji:

2020

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Activated carbon
Burning temperature
Coconut shells
Industrial Applications
Metallic composition

Opis:

Activated carbon is a solid carbon compound that is composed of carbon in the form of charcoal. It plays a major role in some industrial applications such as water and air purification because of the strong adsorption of its surfaces and its tendency to remove some volatile organic compounds (VOC) and most of contaminants from the water, air or some other material. Various base materials are used in the manufacturing of activated carbon, including different woods and certain synthetic materials. According to the scope of new research, it is possible to produce activated carbon economically using coconut shell waste products. In our work, the coconut shells were burnt using a muffle furnace and at a range of temperatures in 300 ºC - 390 ºC. The elemental compositions of manufactured activated carbon were analyzed using X-ray fluorescence (XRF) spectrophotometer, while the surfaces of manufactured activated carbon were microscopically analyzed using an optical microscope. Thus, the range of 330 ºC - 350 ºC was considered as the most adequate temperatures for the manufacturing process of activated carbon from these coconut shells. Beyond the non-metal carbon, 68.85% Fe and 31.15% K are generated.

Źródło:

World News of Natural Sciences; 2020, 31; 25-35
2543-5426

Pojawia się w:

World News of Natural Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 51.

Tytuł:

Ocena zużycia metalowych głów endoprotez stawu biodrowego usuniętych z organizmu ludzkiego z powodu aseptycznego obluzowania
Assessment of wear of metal heads in hip joint prosthesis removed from human body due to aseptic loosening

Autorzy:

Szarek, A.

Powiązania:

https://bibliotekanauki.pl/articles/284872.pdf

Data publikacji:

2008

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

zużycie
biomateriał metaliczny
endoproteza
chropowatość
wear
metallic biomaterial
endoprosthesis
roughness

Opis:

W pracy przedstawiono wyniki oceny stanu powierzchni głów endoprotez stawu biodrowego współpracujących z panewką polietylenową w organizmie ludzkim w okresie od sześciu do jedenastu lat. Badania obejmowały optyczną ocenę stanu powierzchni przy pomocy mikroskopu stereoskopowego oraz ocenę profilu chropowatości współpracującej (zużytej) części głowy endoprotezy.
The paper presents the results of assessment of condition of head surface in hip joint prosthesis mating polyethylene acetabulum in human body throughout the period of 6-11 years. The investigations focused on visual assessment ofthe surface condition by means of a stereoscopic microscope and assessment of the roughness profiles in the mating (worn) part of the prosthesis head.

Źródło:

Engineering of Biomaterials; 2008, 11, 74; 6-10
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 52.

Tytuł:

Ocena właściwości tribologicznych powłok uzyskanych drogą metalizacji natryskowej
Evaluation of tribological coatings obtained by metal spraying

Autorzy:

Laber, S.

Powiązania:

https://bibliotekanauki.pl/articles/189932.pdf

Data publikacji:

2012

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

powłoki metalowe
współczynnik tarcia
zużycie
metallic coatings
friction faktor
wear

Opis:

W pracy przedstawiono wyniki badań właściwości tribologicznych, tj. zużycia i współczynnika siły tarcia powłok uzyskanych na drodze metalizacji natryskowej. Badaniom poddano powłoki na bazie niklu, chromu, chromo-niklu, węglików spiekanych oraz kompozytu ceramicznego. Badania przeprowadzono w funkcji zmienności parametrów F, v, jak również przy stałej prędkości i obciążeniu. Wykazano, że najkorzystniejszymi właściwościami tribologicznymi spośród badanych powłok charakteryzuje się powłoka na bazie węglików spiekanych, a najgorszymi powłoka ceramiczna.
This paper presents the results of tribological properties such as wear and the coefficient of friction forces obtained by coating by metal spraying. The research was based on coatings of nickel, chromium, chromium-nickel, tungsten carbide, and ceramic composites. The study was conducted as a function of variation of parameters P, v, as well as at constant speed and load. It was shown that the most favourable tribological properties of the investigated coatings are characterised by a shell-based cemented carbide, and a ceramic coating was the least favourable.

Źródło:

Tribologia; 2012, 4; 117-124
0208-7774

Pojawia się w:

Tribologia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 53.

Tytuł:

Stanowisko do badań zużycia ściernego intermetali typu FE-AL oraz kompozytów w osnowie metalicznej
Test stand to tribological wear investigations of the intermetalics FE-AL type and composites on the metallic ground mass

Autorzy:

Garbala, K.
Patejuk, A.

Powiązania:

https://bibliotekanauki.pl/articles/270961.pdf

Data publikacji:

2012

Wydawca:

Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD

Tematy:

intermetale
Fe-Al
kompozyty metaliczne
zużycie
intermetallics
metallic composites
wear

Opis:

W niniejszym opracowaniu przedstawiono konstrukcję aparatu do badania zużycia ściernego intermetali i kompozytów w osnowie metalicznej. Podczas projektowania i wykonywania stanowiska, szczególną uwagę zwracano na możliwość zapewnienia jak największych możliwości badawczych w połączeniu z prostotą obsługi. W pracy przedstawiono rozwiązania konstrukcyjne poszczególnych układów roboczych urządzenia. W celu przetestowania stanowiska przeprowadzono i przeanalizowano badania trybologiczne wybranych materiałów inżynierskich typu kompozyty, intermetale.
The design of apparatus for tribological wear investigations of intermetallics and composites on the metallic ground mass is presented in this study. When designing and constructing the test stand, a special attention was paid to assure the greatest research possibilities in conjunction with ease of handling. In paper, constructional solutions of the individual tribotester working layouts are described. In order to test the device, a tribological studies of selected engineering materials such as composites, zinc alloys and intermetallics has been carried out and analyzed.

Źródło:

Aparatura Badawcza i Dydaktyczna; 2012, 17, 1; 49-55
2392-1765

Pojawia się w:

Aparatura Badawcza i Dydaktyczna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 54.

Tytuł:

A framework for corrosion assessment in metallic structures, from data analysis to risk based inspection

Autorzy:

Cui, Xiaofei
Liang, Xiaoxia
Bharadwaj, Ujjwal

Powiązania:

https://bibliotekanauki.pl/articles/1841787.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN

Tematy:

corrosion estimation
steel bridge
metallic structures
risk based inspection
software

Opis:

Metallic corrosion is a big challenge affecting many sectors in a nation’s economy. Necessary corrosion prevention actions have to be taken in order to maintain the integrity of engineering assets susceptible to corrosion. This paper proposes a holistic framework to support the management of corrosion in metallic structures. It is a fully automation corrosion assessment process, with risk updated by Bayesian theory. Through analyzing the thickness data measured by non-destructive testing (NDT) techniques, the influence of corrosion on the component can be estimated using statistical methods, which will enable users to make decisions on maintenance based on quantitative information. A case study using corrosion data from a steel bridge is included to demonstrate the proposed framework. It improved the conventional corrosion analysis method by the proposed statistical approach using representative thickness data, which aims to take full use of the remaining life. This model can be adapted to a wide range of metallic structure suffering from corrosion damage.

Źródło:

Eksploatacja i Niezawodność; 2021, 23, 1; 11-20
1507-2711

Pojawia się w:

Eksploatacja i Niezawodność

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 55.

Tytuł:

Infulence of recrystallization on damping properties of alloy Fe75Zr4Ti3B17Cu1

Autorzy:

Bocian, M.
Mech, R.
Myszka, W.
Przybylski, M.

Powiązania:

https://bibliotekanauki.pl/articles/348167.pdf

Data publikacji:

2016

Wydawca:

Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki

Tematy:

experimental mechanics
metallic glass
amorphous alloy
material properties
material science

Opis:

It is expected that damping in amorphous metals change after its recrystallization. For this purpose study of this phenomena was investigated. An alloy Fe₇₅ Z r₄Ti₃B₁₇Cu₁ was manufactured in a very specific conditions to obtain amorphous structure. To confirm structure of the manufactured material basic testing was conducted including XRD, AFM, LFM and SEM with EDS attachment. The study showed that the structure in fact is partially amorphous and partially nanocrystalline. To determine expected change of damping sample in form of rod was tested for bounce height in controlled conditions before and after heat treatment that changed materials structure. Obtained results indicate decrease of damping after heat treatment and therefore confirms initial assumption.

Źródło:

Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki; 2016, 4; 123-134
1731-8157

Pojawia się w:

Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 56.

Tytuł:

Odporność korozyjna stopu Co-Cr-W-Ni (L605) w wybranych płynach fizjologicznych
Corrosion resistance of Co-Cr-W-Ni (L605) alloy in simulated body fluids

Autorzy:

Kajzer, W.
Marciniak, J.

Powiązania:

https://bibliotekanauki.pl/articles/285689.pdf

Data publikacji:

2008

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

biomateriały metalowe
odporność korozyjna
implanty
metallic biomaterials
corrosion resistance
implants

Źródło:

Engineering of Biomaterials; 2008, 11, no. 77-80; 76-79
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 57.

Tytuł:

Odporność korozyjna stopu Co-Cr-W-Ni (L605) w wybranych płynach fizjologicznych
Corrosion resistance of Co-Cr-W-Ni (L605) alloy in simulated body fluids

Autorzy:

Kajzer, W.
Marciniak, J.

Powiązania:

https://bibliotekanauki.pl/articles/286243.pdf

Data publikacji:

2009

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

odporność korozyjna
implanty
biomateriały metalowe
corrosion resistance
implants
metallic biomaterials

Źródło:

Engineering of Biomaterials; 2009, 12, no. 89-91; 241-243
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 58.

Tytuł:

An analysis of non-isothermal primary crystallization kinetics of Fe95Si5 amorphous alloy

Autorzy:

Frączyk, Adam
Kuś, Krzysztof
Wojtkowiak, Adam

Powiązania:

https://bibliotekanauki.pl/articles/950068.pdf

Data publikacji:

2019

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie

Tematy:

metallic glass
energy activation
Avrami exponent
crystallization kinetics parameter
DSC

Opis:

The paper describes the primary crystallization of metallic Fe95Si5 glass which was studied by differential scanning calorimetry (DSC) with non-isothermal methods. The activation energy of crystal transformation was calculated with the equations proposed by Kissinger, Mahadevan and a modified version of the equation developed by Augis and Bennett. Activation energy was determined at Ea = 242.0 - 254.2 kJ / mol, subject to the applied method. The Avrami exponent of crystallization in the amorphous phase n was determined in the range of n = 2.40 - 2.52, depending on the method of calculating the transformation of activation energy.

Źródło:

Technical Sciences / University of Warmia and Mazury in Olsztyn; 2019, 22(3); 237-247
1505-4675
2083-4527

Pojawia się w:

Technical Sciences / University of Warmia and Mazury in Olsztyn

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 59.

Tytuł:

Upgrading valuable mineralization and rejecting magnesium silicates by pre-concentration of mafic ores

Autorzy:

Altun, N. E.
Weatherwax, T.
Klein, B.

Powiązania:

https://bibliotekanauki.pl/articles/109691.pdf

Data publikacji:

2014

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

mafic ores
preconcentration
dense media separation
metallic sulphides
ore mineralogy

Opis:

Amenability of mafic ores to pre-concentration was investigated with respect to ore mineraliza-tion characteristics. For the pre-concentration tests seven ores from various nickel-copper operations at Sudbury, Ontario were subjected to dense medium separation. Size assays of metal values, i.e. distribution of nickel and copper with respect to size fractions, were also determined. The ores were assessed in three categories of valuable mineralization as massive pure sulphides, coarse massive sulphide grains and disseminated sulphides. For ores with massive pure sulphides and coarse massive sulphide grains even a size classification based pre-concentration route could be sought since a clear trend of metal enrichment was identified towards finer fractions. Orebodies of similar mineralogy had similar responses to pre-concentration tests. The best results were for those ore bodies with a distinct differentiation between mineralization and gangue, i.e. the ores with massive pure sulphides, where nickel recoveries of 97% and mass rejections of 38-53% were achieved. Similar results were obtained for ores with coarse massive sulphides. For disseminated sulphide mineralogy relatively lower mass rejection was attained with acceptable recoveries of metals. Rejection of magnesium bearing gangue, such as talc, was identified as another benefit of pre-concentration. The extent of magnesium rejection occurred as a function of ore mineralogy. Clear distinction between valuable mineralization and gangue provided preferential magnesium rejection at high levels with no or minor metal losses.

Źródło:

Physicochemical Problems of Mineral Processing; 2014, 50, 1; 203-215
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 60.

Tytuł:

Computer Simulation of the Formation of Non-Metallic Precipitates During a Continuous Casting of Steel

Autorzy:

Kalisz, D.
Żak, P. L.
Tokarski, T.
Wzorek, Ł.
Suchy, J. S.
Kiczor, M.
Cieślak, W.

Powiązania:

https://bibliotekanauki.pl/articles/958226.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

non-metallic oxide precipitates
modelling
continuous casting of steel
crystallization

Opis:

The authors own computer software, based on the Ueshima mathematical model with taking into account the back diffusion, determined from the Wołczyński equation, was developed for simulation calculations. The applied calculation procedure allowed to determine the chemical composition of the non-metallic phase in steel deoxidised by means of Mn, Si and Al, at the given cooling rate. The calculation results were confirmed by the analysis of samples taken from the determined areas of the cast ingot. This indicates that the developed computer software can be applied for designing the steel casting process of the strictly determined chemical composition and for obtaining the required non-metallic precipitates.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 1; 335-340
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 61.

Tytuł:

Evaluation of Corrosion Resistance of Titanium Alloys Used for Medical Implants

Autorzy:

Szewczenko, J.
Marciniak, J.
Kajzer, W.
Kajzer, A.

Powiązania:

https://bibliotekanauki.pl/articles/351507.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

metallic biomaterials
titanium alloys
corrosion resistance
mechanical processing
anodic oxidation

Opis:

The study presents the results of investigations of modeling the usable properties of implant surfaces made of Ti6Al7Nb alloy, using the example of a dynamic hip screw (DHS) applied in surgical treatment of intertrochanteric femoral neck fractures. Numerical simulation has been performed for the model load of femoral fixation with DHS screw. The load simulation results provided the basis to select mechanical properties of the fixator elements and to define those fixation areas which are mostly susceptible to development of corrosion. The surfaces of Ti6Al7Nb alloy were ground, vibro-abrasive machined, mechanically polished, sandblasted, anode oxidized at different voltage values and steam sterilized. Results of surface topography evaluation, resistance to pitting and crevice corrosion as well as degradation kinetics of the outer layer were presented. Usability of the formed passive layer in clinical applications was evaluated through wear and corrosion tests of the femoral fixation model. The test results proved usefulness of the proposed surface modification methods for clinical application of different size and shape implants.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 2A; 695-700
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 62.

Tytuł:

Electroless Deposition of Composite Nickel-Phosphorous Coatings with Diamond Dispersoid

Autorzy:

Petrova, M.
Georgieva, M.
Chakarova, V.
Dobreva, E.

Powiązania:

https://bibliotekanauki.pl/articles/353820.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

functional composites
electroless coatings
metal-matrix composites
non-metallic substrate

Opis:

The composite Ni-P coating with diamond particles (D) deposited on the flexible substrates of pressed polyethylene terephthalate material (PET) was obtained, to be used in the development of efficient, flexible grinding and polishing tools. The optimal conditions of the hydrodynamic regime, deposition time and temperature were found. The influence of the concentration and size of the D particles (3/7 ÷ 225/300 μm) on the coating thickness and number of co-deposited particles were studied. By Scanning Electron Microscopy (SEM) images were defined the morphology of dispersion coatings and number of co-deposited particles in them, and Energy Dispersive Spectroscopy (EDS/INCA) was used to determine the elemental chemical composition of the composite coatings.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 2A; 493-498
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 63.

Tytuł:

Impact of electro slag remelting on 14 109 steel properties

Autorzy:

Pribulova, A.
Futáš, P.
Kmita, A.
Márasová, D.
Holtzer, M.

Powiązania:

https://bibliotekanauki.pl/articles/355904.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

electroslag remelting
slag
non-metallic inclusions
mechanical properties
chemical composition

Opis:

The Electro Slag Remelting (ESR) is one of the remelting processes in the field of metal refinery. In this process, the slag plays various roles, such as heat generation, protection of melt, and chemical refining. The main objective of the experiments described in this article was to identify the most appropriate slag composition for the electro slag remelting of the steel in order to achieve the chemical composition compliant with the standard applicable to the given steel, minimum sulphur content, minimum contents of oxide and sulphide inclusions, as well as mechanical properties corresponding to the standard applicable to the steel STN 14 109. Ten electrodes were remelted, whereas the remelting was carried out under 8 slags. The used slags containing 70% of CaF₂ and 30% of Al₂O₃ with different addition of CaO, the slags consisted of the same components as previous slags, whereas the ratio of individual components was 1:1:1, and with SiO₂ and MgO and slag without Al₂O₃. With regard to all the above mentioned facts, the slag types which may be regarded as the most appropriate for the STN 14 109 steel remelting are the basic slags containing 70% of CaF₂ - 30% of Al₂O₃ with added 30 and 45 weight % of CaO.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 1; 181-185
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 64.

Tytuł:

Technology of Production of Mold Filling Material for Specific Purposes in the Field of Metallic Foam Casting

Autorzy:

Kroupová, Ivana
Bašistová, Martina
Lichý, Petr
Merta, Václav
Radkovský, Filip
Jezierski, Jan

Powiązania:

https://bibliotekanauki.pl/articles/28099598.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

molding mixture
metallic foams
precursor
abrasion loss
3-point bending strength

Opis:

This paper describes the technology for the production of precursors (space holder material) used to form the complex internal structure of cast metal foam. The precursor material must exhibit sufficient refractoriness, resist contact with liquid metal and at the same time should exhibit good collapsibility after casting. With regard to the greening of foundry production, the focus of this paper was on materials that could exhibit the above properties and at the same time do not have a negative impact on the environment. In this paper, the technology for the production of spherical precursors from a self-hardening mixture with a geopolymer-based binder system is described and verified. The motivation for the choice of material and all the sub-steps of the process - molding into the core box, tumbling, including the necessary accompanying tests of the mechanical properties of the core mixture being verified - are described.

Źródło:

Archives of Metallurgy and Materials; 2023, 68, 2; 757--763
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 65.

Tytuł:

Deoxidation Impact on Non-Metallic Inclusions and Characterization Methods

Autorzy:

Nicolini, C.

Powiązania:

https://bibliotekanauki.pl/articles/106913.pdf

Data publikacji:

2017

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

sulfide morphology
deoxidation
non-metallic inclusions
low carbon steel
SEM-FEG

Opis:

Deoxidation is an unavoidable step in the elaboration of steel. The study of its influence could improve the quality of low-carbon steel (0.20–0.25 wt.% of carbon). There are many deoxidation methods, and the most-common one consists of adding aluminum. Although it is a classic method, determining the optimal process parameters (quantity, yield, etc.) could be very sensitive. Deoxidation plays a determining role on inclusion cleanliness, especially on sulfide morphology. In order to control the efficiency of deoxidation, different techniques can be used. In this paper, an automated counting procedure on a scanning electron microscope with a field emission gun (FEG-SEM) is presented. This method was applied on samples cast in our laboratory under different deoxidation conditions. According to this, the resulting inclusion population is correlated with the aluminum content to find the optimal process parameters.

Źródło:

Journal of Casting & Materials Engineering; 2017, 1, 4; 97-102
2543-9901

Pojawia się w:

Journal of Casting & Materials Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 66.

Tytuł:

Ocena powtarzalności czystości metalurgicznej łuków ortodontycznych
The analysis of metallurgical purity repeatability of orthodontic wires

Autorzy:

Koczkodon, K.
Grygier, D.

Powiązania:

https://bibliotekanauki.pl/articles/99126.pdf

Data publikacji:

2018

Wydawca:

Politechnika Śląska. Katedra Biomechatroniki

Tematy:

biomateriał
łuk ortodontyczny
wtrącenia niemetaliczne
biomaterial
orthodontic wire
non-metallic inclusions

Opis:

Materiały metaliczne przeznaczone do produkcji aparatów ortodontycznych powinny posiadać następujące cechy: wysokie właściwości mechaniczne i fizykochemiczne, biokompatybilność i jednorodność struktury. Bardzo ważnym aspektem jest również ich stopień zanieczyszczenia wtrąceniami niemetalicznymi. Wyniki badań prezentowanych w pracy wykazały dużą różnorodność w zakresie czystości metalurgicznej materiału badanych drutów, mogącej wskazywać, iż w analizowanej partii łuków znajdują się produkty pochodzące z różnych wytopów, znacząco różniące się jakością wykonania.
The metallic materials designed to production of braces possess following features: high mechanical and physicochemical proprieties, biocompatibility and homogeneity of structure. Very important point is also degree non-metallic inclusion. The results of investigations presented in work show the large diverseness of metallurgical cleanness of studied wires material, which lead that various product could coming from different melting, non-uniform with quality of realization.

Źródło:

Aktualne Problemy Biomechaniki; 2018, 15; 13-20
1898-763X

Pojawia się w:

Aktualne Problemy Biomechaniki

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 67.

Tytuł:

Improved adhesion and growth of osteoblast-like MG-63 cells in cultures on titanium modified by gold particles

Autorzy:

Parizek, M.
Base, T.
Hruby, M.
Lisa, V.
Bacakova, L.

Powiązania:

https://bibliotekanauki.pl/articles/285778.pdf

Data publikacji:

2013

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

metallic materials
titanium
surgical implants
gold microparticles
cell adhesion
cell growth

Opis:

Metallic materials are important for load-bearing bone implants. The osteointegration of these implants can be improved by appropriate surface modifications. Therefore, we present here a study of the cell growth on titanium surfaces modified with films created from gold microparticles. These particles in the form of microplates or polyhedral microcrystals were deposited on titanium plates from ethanol solutions, dried and annealed with a hydrogen flame. Some samples were additionally modified by polyethylene imine. The materials engendered from these modifications were used to investigate the adhesion and growth of human osteoblast-like MG-63 cells on these surfaces in the DMEM medium with 10% of fetal bovine serum. One day after seeding, the highest number of initially adhered cells was found on the surfaces modified by both types of gold microparticles. This trend was the same three and seven days after seeding. The numbers of cells on pure Ti and Ti modified only with gold particles were significantly higher than on samples which were modified with polyethylene imine. The cell spreading areas projected on the materials were significantly larger in cells on the samples with polyethylene imine modification. However, the shape of these cells was mostly rounded or star-like with thin and long protrusions, while on the materials without polyethylene imine, it was mostly polygonal. The cell proliferation activity was estimated from XTT test, based on the activity of mitochondrial enzymes. This test showed that the proliferation activities of osteoblast-like MG-63 cells of the 3rd and 7th days of the experiment were more pronounced on the samples modified only by gold microparticles. Immunofluorescence showed that the focal adhesion plaques containing vinculin and the fibers containing β-actin were most apparent, more numerous and more brightly stained in cells on Ti modified by gold microplates and gold polyhedral microcrystals, especially in comparison with the corresponding samples modified with polyethylene imine (Fig. 1). Thus, it can be concluded that the modification of titanium samples by both types of gold microparticles enhanced the adhesion and growth of MG 63 cells.

Źródło:

Engineering of Biomaterials; 2013, 16, no. 122-123 spec. iss.; 77
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 68.

Tytuł:

Experimental biomechanical assessment of plate stabilizers for treatment of pectus excavatum

Autorzy:

Kajzer, A.
Kajzer, W.
Gzik-Zroska, B.
Wolański, W.
Janicka, I.
Dzielicki, J.

Powiązania:

https://bibliotekanauki.pl/articles/307022.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

biomechanical characteristics
metallic biomaterials
plate stabilizers
pectus excavatum
biomechanika
biomateriały
stabilizator

Opis:

The paper discusses results of experimental research involving new generation of plate stabilizers used for the treatment of deformation of the front chest wall. Previous clinical monitoring revealed instances of minimal rotation, which caused destabilization of the anastomosis and pain in patients. In order to prevent this, transverse stabilizing plates were introduced to the structure of the stabilizer. The new structure of stabilizers was tested using two specially prepared research posts: 1 – which enables fastening of the plate stabilizers to a platform simulating human ribs, 2 – using a pig chest, to which plates were fastened according to the stabilization conditions in the stabilizer–chest structure. The tests recorded displacement values in selected areas of the plates in response to applied loading forces.

Źródło:

Acta of Bioengineering and Biomechanics; 2013, 15, 3; 113-121
1509-409X
2450-6303

Pojawia się w:

Acta of Bioengineering and Biomechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 69.

Tytuł:

Interaction of Non-Metallic Inclusion Particles with Advancing Solidification Front
Oddziaływanie cząstek wydzieleń niemetalicznych z postępującym frontem krzepnięcia

Autorzy:

Kalisz, D.

Powiązania:

https://bibliotekanauki.pl/articles/354360.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

solidification front
non-metallic inclusions
forces
front krzepnięcia
wydzielenie niemetaliczne
siła

Opis:

This work deals the phenomenon interaction of crystallization front on the particles of non-metallic precipitates. The behavior of a single particle in the vicinity of horizontal and vertical front was analyzed. The forces acting on the particle were characterized and the equilibrium condition formulated, from which the critical velocity of front may be deduced. The calculation results were illustrated in the form of graphs.
Praca zajmuje się zjawiskiem oddziały wania przemieszczającego frontu krystalizacji na cząstki wydzieleń niemetalicznych. Analizowano zachowanie pojedynczej cząstki wydzielenia w pobliżu poziomego i pionowego frontu. Scharakteryzowano siły działające na cząstkę w pobliżu frontu i sformułowano warunek równowagi, z którego wynika szybkość krytyczna frontu. Wyniki obliczeń zilustrowano w postaci wykresów.

Źródło:

Archives of Metallurgy and Materials; 2014, 59, 2; 493-500
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 70.

Tytuł:

Polymeric locking clips [Hem-o-lok] versus Metallic clips in elective Laparoscopic Cholecystectomy: a retrospective study of 1496 patients

Autorzy:

Madhavan, Shibumon
Pandey, Anshuman
Masood, Shakeel
Kumar, Suneed
Chauhan, Smita
Kumar, Dinesh
Jha, Sneha

Powiązania:

https://bibliotekanauki.pl/articles/1391545.pdf

Data publikacji:

2021

Wydawca:

Index Copernicus International

Tematy:

Hem-o-lok clip
laparoscopic cholecystectomy
metallic clip
wide cystic duct

Opis:

Background Laparoscopic cholecystectomy is one of the most commonly performed operation. Various methods for securing the cystic artery and cystic duct are described in literature. We aim to compare intra-operative and early post-operative outcomes of laparoscopic cholecystectomy using polymeric locking Hem-o-lok clips versus metallic ligaclips . Patients and Methods Retrospective study of prospectively maintained single institutional data including all consecutive patients who underwent elective laparoscopic cholecystectomy from 2013 to 2018. Patients in whom metallic ligaclips were used were grouped as Group I and those with Hem-o-Lok were grouped as Group II. The early post-operative outcomes of the two groups were compared. Results Total 1496 patients were included in the study; 836 patients in Group I and 660 in Group II. Study included 29.1% males and 70.9% females with mean age of 43.6 years. Hem-o-lok clip was better in securing wide cystic duct compared to metallic clips. Metallic clip failed to secure 8 out of 44 wide cystic duct compared to 0 out 70 with Hem-o-lok clips (p=0.002). The post-operative outcomes of both groups were comparable. There were no cystic duct leak, post- operative bleeding or major bile duct injuries in either group. Conclusion Use of Hem-o-lok clip is safe in laparoscopic cholecystectomy due to ease of application and security. Hem-o-lok is more useful in patients with thick and wide cystic duct which are difficult to secure with metallic clips with low risk of leak. Key words: Laparoscopic Cholecystectomy, Hem-o-lok clip, Metallic clip, Wide cystic duct

Źródło:

Polish Journal of Surgery; 2021, 93, 3; 10-16
0032-373X
2299-2847

Pojawia się w:

Polish Journal of Surgery

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 71.

Tytuł:

Assessment of Heavy Metals in the Sediments of the Inaouene Watershed Upstream the Idriss 1st Dam, Northern Morocco

Autorzy:

Laaraj, Marouane
Mesnage, Valerie
Nabih, Soumaya
Mliyeh, Mohammed Mouad
Lahmidi, Ikram
Benaabidate, Lahcen

Powiązania:

https://bibliotekanauki.pl/articles/2173376.pdf

Data publikacji:

2022

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

sediment
metallic trace element
Inaouene river
Idriss 1st dam
pollution

Opis:

In order to evaluate the degree of sediment contamination by metallic trace elements in the watershed of Oued Inaouene (North-East of Morocco), samples of surface sediments were taken along the river and at the level of the Idriss 1st dam. The objective was to obtain thorough knowledge of the environment (metallic element content, organic matter content, granulometry, and pH, EC, CaCO3 content) in order to identify the degree of pollution in these sediments. The results of analysis have highlighted a contamination accentuated by Ba, Sr, P, Cu, Pb, In fact, this element is present at very high levels, with a maximum content ppm for the samples taken upstream of Oued Inaouene. This increase is related to the physicochemical conditions of the environment, despite the diversity of sources of pollutants. The analysis of hazardous heavy metals showed the values under the detection limits. The qualitative study allowed to identifying the source of contamination, it is an anthropogenic source related to the discharges of cities in vicinity of Oued Inaouene, and natural considered as the main source of pollution by trace elements of sediments that constitute an important reserve of pollutants in the environment.

Źródło:

Journal of Ecological Engineering; 2022, 23, 9; 157--170
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 72.

Tytuł:

Subsurface structure and magnetic parameters of Fe-Mo-Cu-B metallic glass

Autorzy:

Miglierini, M.
Hasiak, M.
Bujdoš, M.

Powiązania:

https://bibliotekanauki.pl/articles/147390.pdf

Data publikacji:

2015

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

ion bombardment
metallic glasses
Mössbauer spectrometry
soft magnetic properties
surface structure

Opis:

Subsurface properties of 57Fe81Mo9Cu1B9 metallic glass were studied by conversion electron and conversion X-ray Mössbauer spectrometry. They were applied to both surfaces of the ribbons. Deviations in structural surface features are exhibited via different contents of crystalline phases, which were identifi ed as bcc-Fe and magnetite. The presence of small ferromagnetic particles was also suggested from magnetic measurements. An infl uence of irradiation with 130-keV N+ ions on surface properties of the as-quenched alloy is also discussed.

Źródło:

Nukleonika; 2015, 60, 1; 115-119
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 73.

Tytuł:

New test methods of non-metallic pipeworks for liquid fuels
Nowe metody testowania niemetalowych rur do przesyłu paliw płynnych

Autorzy:

Vatavu, N.
Vatavu, S.
Paraian, M.
Jurca, A.
Paun, F.

Powiązania:

https://bibliotekanauki.pl/articles/300089.pdf

Data publikacji:

2009

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

niemetalowe rury podziemne
wymogi bezpieczeństwa
underground non-metallic pipes
safety requirements

Opis:

The non-metallic pipeworks are used on an increasingly wider scale in transport or storage installations in petrol-chemical industry and in the petrol filling stations, due to their superior performances compared to the metallic pipeworks (corrosion and risk of stray currents are two essential arguments in favour of using the non-metallic conduits). For the non-metallic conduits it must be taken into account the explosion risk that occurs because of the combustible vapours emitted into the atmosphere and which may form an explosive mixture. This is the reason why they must comply to the requirements provided in SR EN 14125; having this in view, in the paperwork are presented specific laboratory tests, emphasizing here the tests in positive, negative (vacuum) and cyclic pressure, tests for which are shown the test stands designed and realized in the laboratory LSIEM-INCD INSEMEX Petrosani.
Niemetalowe rury wykorzystywane są na coraz większą skalę w instalacjach do transportu i przechowywania w przemyśle petrochemicznym oraz na stacjach benzynowych ze względu na znakomite cechy w porównaniu z instalacjami wykonanymi z metalu (korozja oraz zagrożenie prądami błądzącymi to dwa podstawowe fakty przemawiające za konstrukcjami bez użycia metalu). W przypadku materiałów innych niż metalowe należy pamiętać o zagrożeniu wybuchami, jakie występuje w przypadku palnych oparów emitowanych do atmosfery, które mogą tworzyć mieszaninę wybuchową. Z tego też powodu instalacje powinny spełniać wymogi norm SR EN 14125. Mając to na uwadze, przedstawiono w artykule badania laboratoryjne ze szczególnym uwzględnieniem testów w warunkach dodatniego, ujemnego (próżnia) i cyklicznego ciśnienia. Przedstawiono stanowiska laboratoryjne użyte do badań. Zaprojektowano i wykonano je w laboratorium LSIEM-INCD INSEMEX Petrosani.

Źródło:

Wiertnictwo, Nafta, Gaz; 2009, 26, 3; 567-573
1507-0042

Pojawia się w:

Wiertnictwo, Nafta, Gaz

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 74.

Tytuł:

The effects of conductivity and pH of saliva on electrochemical potentials of metallic dental materials

Autorzy:

Opydo-Szymaczek, J.
Opydo, J.
Opydo, W.

Powiązania:

https://bibliotekanauki.pl/articles/97371.pdf

Data publikacji:

2015

Wydawca:

Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej

Tematy:

metallic dental materials
electrochemical potential
galvanic cells
oral galvanism
conductivity
pH

Opis:

The paper presents results of the study on electrochemical potentials of metallic dental materials. Seven alloys, amalgam and chromium-nickel steel were examined as well as the effect of the solution conductivity ranging from 12.5 μS/cm to 2.01 mS/cm and solution pH within the range of 5.5 to 11.2 on electrochemical potentials of the materials. Amalgam presented with the lowest changes of the standard potential due to changing conductivity and pH of the solution within experiment conditions. Moreover, increase of pH value caused decrease of electrochemical potential of all examined materials, apart from amalgam. It was proved that electromotive force of galvanic cells formed by some of the examined materials and amalgam are often higher than 200 mV. Statistica software was used for mathematical analysis of the results.

Źródło:

Computer Applications in Electrical Engineering; 2015, 13; 143-152
1508-4248

Pojawia się w:

Computer Applications in Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 75.

Tytuł:

Hot Deformation Activation Energy of Metallic Materials Influenced by Strain Value

Autorzy:

Schindler, I.
Opěla, P.
Kawulok, P.
Sauer, M.
Rusz, S.
Kuc, D.
Rodak, K.

Powiązania:

https://bibliotekanauki.pl/articles/2049432.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

flow stress curves
steady state
metallic materials
hot deformation activation energy

Opis:

Suitable and complete sets of stress-strain curves significantly affected by dynamic recrystallization were analyzed for 11 different iron, copper, magnesium, titanium or nickel based alloys. Using the same methodology, apparent hot deformation activation energy Qp and Qss values were calculated for each alloy based on peak stress and steady-state stress values. Linear dependence between quantities Qp and Qss was found, while Qp values are on average only about 6% higher. This should not be essential in predicting true stress of a specific material depending on the temperature-compensated strain rate and strain.

Źródło:

Archives of Metallurgy and Materials; 2021, 66, 1; 223-228
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 76.

Tytuł:

Effect of Hafnium and Zirconium to Glass Forming Ability, Thermal Stability, Plasticity Deformation and Crystallization of Ni-Free Pentabasic Ti-Based Bulk Metallic Glasses

Autorzy:

Oak, J.-J.
Kim, Y. H.
Bae, K.-C.
Park, Y. H.

Powiązania:

https://bibliotekanauki.pl/articles/352087.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Ti-based alloy
metallic glass
Ti fiber
glass formability
plastic deformation

Opis:

The newly designed Ti-based bulk metallic glass (BMG) in which case of fracture behavior was observed 1990MPa to compressive strength with a wide plastic deformation around 7% after process of elastic deformation. This phenomenon can be compared with those of Ti-based alloys and other Ti-based BMGs and indicates high potential to be applied in use. It was evaluated the Ti-based BMG for thermal stability that the reduced glass parameters, ΔT_x, T_rg and γ, are 79K, 0.50 and 0.38, respectively. In addition, it reveals high activation energies for crystallization in which are estimated to E_x1 = 291.77 ±9.71 kJ/mol, E_x2 = 588.77 ±28.88 kJ/mol and E_x3 = 330.26 ±3.61 kJ/mol on kissinger plotting in this study.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 2B; 1081-1087
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 77.

Tytuł:

Effect of direct reduction time of vanadium titanomagnetite concentrate on the preparation and photocatalytic performance of calcium titanate

Autorzy:

Li, Xiaohui
Kou, Jue
Sun, Tichang
Wu, Shichao
Tian, Yuechao

Powiązania:

https://bibliotekanauki.pl/articles/1449028.pdf

Data publikacji:

2021

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

vanadium titanomagnetite concentrate
calcium titanate
direction reduction
metallic iron
photocatalytic performance

Opis:

Effects of direct reduction time of vanadium titanomagnetite concentrate (VTCE) on the preparation and photocatalytic performance of calcium titanate were investigated in this study. It was found that extending the reduction time could not only promote the formation of calcium titanate, but also facilitate the reduction of iron minerals in the reduction products. The optimum reduction time was 180min under the conditions of $CaCO_3$ dosage of 18wt%, reduction temperature of 1400℃ and lignite dosage of 70wt%. The reduced iron (Fe grade of 90.95wt%, Fe recovery of 92.21wt%) and calcium titanate were obtained via grinding-magnetic separation. Moreover, calcium titanate prepared via the direct reduction method could be used as a photocatalyst, where the degradation degree of methylene blue increased from 25.13% to 60.14% with the addition of calcium titanate. Furthermore, Langmuir Hinshelwood fitting results indicated that the degradation of methylene blue by the calcium titanate prepared under different reduction times conformed to first-order reaction kinetics, where the photocatalytic degradation rate of methylene blue was noted to be the highest for a reduction time of 180 min.

Źródło:

Physicochemical Problems of Mineral Processing; 2021, 57, 1; 75-86
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 78.

Tytuł:

Research on the Knittability of Metallic Yarns in the Warp-knitted Mesh of a Deployable Antenna

Autorzy:

Haiyan, Xu
Nanliang, Chen
Jinhua, Jiang

Powiązania:

https://bibliotekanauki.pl/articles/24200963.pdf

Data publikacji:

2023

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych

Tematy:

metallic yarn
knittability
knitted yarn strength
utilisation factor
tensile properties
bending stiffness

Opis:

Metallic yarns are difficult to be knitted. To resolve the problem, the paper used the knitted yarn strength utilization factor to quantitatively characterize knittability, which was the ratio of yarn strength after being knitted to that of the original yarns. Furthermore, the relationship between the yarns’ basic mechanical properties and the knitted yarn strength utilization factor was investigated by testing the yarns’ basic mechanical properties. The results showed that it was feasible to quantitatively characterize the yarns’ knittability using the knitted yarn strength utilization factor. And also the breaking strength of yarn was not correlated with the knittability. The elongation at break of the yarn was positively correlated with knittability. The bending stiffness of the yarn was negatively correlated with the knittability. Finally, a multiple linear regression model of the knittability and the mechanical properties of the yarn was developed. The model showed that there was a significant linear relationship between knittability and the elongation of yarns at break and the bending rigidity of yarns, with the bending stiffness of yarns being more significant.

Źródło:

Fibres & Textiles in Eastern Europe; 2023, 31, 2; 51--55
1230-3666
2300-7354

Pojawia się w:

Fibres & Textiles in Eastern Europe

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 79.

Tytuł:

Obtaining of metallic nanoparticles by plasma-erosion electrical discharges in liquid mediums for biological application
Uzyskiwanie nanocząstek metali poprzez wyładowania elektryczne w zakresie erozji plazmy w środowisku wodnym w zastosowaniach biologicznych

Autorzy:

Lopatko, K.G.
Melnichuk, M.D.
Aftandilyants, Y.G.
Gonchar, E.N.
Boretskij, V.F.
Veklich, A.N.
Zakharchenko, S.N.
Tugay, T.I.
Tugay, A.V.
Trach, V.V.

Powiązania:

https://bibliotekanauki.pl/articles/56253.pdf

Data publikacji:

2013

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie

Tematy:

metallic nanoparticle
nanoparticle
biological function
plasma
electrical discharge
liquid medium
biological application

Opis:

Obtaining of metallic nanoparticles by plasma-erosion electrical discharges in liquid mediums for biological application. The process of electrical discharge in the water of the plasma discharge channel was investigated and its diagnostics was performed. The specific features of the energy redistribution were shown, together with the physical model of the dispersed phase. The biological functionality of the metal nanoparticles and the prospects for their use in biotechnology were found.
Uzyskiwanie nanocząstek metali poprzez wyładowania elektryczne w zakresie erozji plazmy w środowisku wodnym w zastosowaniach biologicznych. Przeprowadzono badania wyładowań elektrycznych w środowisku wodnym w celu uzyskania nanocząstek metali. Określono specyficzne cechy redystrybucji energii oraz przedstawiono fizyczny model fazy rozproszonej. Określono funkcjonalność biologiczną nanocząsteczek metali oraz perspektywy ich wykorzystania w biotechnologii.

Źródło:

Annals of Warsaw University of Life Sciences - SGGW. Agriculture; 2013, 61 Agric.Forest Eng.
0208-5712

Pojawia się w:

Annals of Warsaw University of Life Sciences - SGGW. Agriculture

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 80.

Tytuł:

Experimental research on insufficient water lubrication of marine stern tube journal bearing with elastic polymer bush

Autorzy:

Barszczewska, Agnieszka

Powiązania:

https://bibliotekanauki.pl/articles/1573813.pdf

Data publikacji:

2020

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

lubrication failure
bearing seizure
water-lubricated bearing
non-metallic bearing
sliding bearing

Opis:

Water-lubricated bearings with polymer bushes are steadily gaining popularity due to their advantages, including environmental friendliness, relatively simple construction and long-term operation. Nevertheless, in practice instances of damage to such bearings occur due to insufficient or absent flow of the lubricating agent. In this study, experimental tests established that elastic polymer bush bearing is capable of operating without excessive wear for a period of at least 60 minutes under conditions of marginal water flow and typical loads for stern tube journal bearings of small ships.

Źródło:

Polish Maritime Research; 2020, 4; 91-102
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 81.

Tytuł:

Corrosion Resistance and Pitting Behaviour of Low-Carbon High-Mn Steels in Chloride Solution

Autorzy:

Grajcar, A.
Grzegorczyk, B.
Kozłowska, A.

Powiązania:

https://bibliotekanauki.pl/articles/350848.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

high-Mn steel
non-metallic inclusions
SEM
polarization
pitting
effects of strain

Opis:

Corrosion resistance of the X4MnSiAlNbTi27-4-2 and X6MnSiAlNbTi26-3-3 type austenitic steels, after hot deformation as well as after cold rolling, were evaluated in 3.5% NaCl solution using potentiodynamic polarization tests. A type of nonmetallic inclusions and their pitting corrosion behaviour were investigated. Additionally, the effect of cold deformation on the corrosion resistance of high-Mn steels was studied. The SEM micrographs revealed that corrosion damage formed in both investigated steels is characterized by various shapes and an irregular distribution at the metallic matrix, independently on the steel state (thermomechanically treated or cold worked). Corrosion pits are generated both in grain interiors, grain boundaries and along the deformation bands. Moreover, corrosion damage is stronger in cold deformed steels in comparison to the thermomechanically treated specimens. EDS analysis revealed that corrosion pits preferentially nucleated on MnS and AlN inclusions or complex oxysulphides. The morphology of corrosion damage in 3.5% NaCl supports the data registered in potentiodynamic tests.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 2A; 825-832
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 82.

Tytuł:

Incorporation of the Pore Size Variation to Modeling of the Elastic Behavior of Metallic Open-Cell Foams

Autorzy:

Ćwieka, K.
Wejrzanowski, T.
Kurzydłowski, K. J.

Powiązania:

https://bibliotekanauki.pl/articles/354721.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

open-cell metallic foams
Laguerre-Voronoi tessellations
pore size variation
Young's modulus

Opis:

In the present paper we present the approach for modeling of the elastic behavior of open-cell metallic foams concerning non-uniform pore size distribution. This approach combines design of foam structures and numerical simulations of compression tests using finite element method (FEM). In the design stage, Laguerre-Voronoi tessellations (LVT) were performed on several sets of packed spheres with defined variation of radii, bringing about a set of foam structures with porosity ranging from 74 to 98% and different pore size variation quantified by the coefficient of pore volume variation, CV(V), from 0.5 to 2.1. Each structure was numerically subjected to uni-axial compression test along three directions within the elastic region. Basing on the numerical response, the effective Young’s modulus, E_eff, was calculated for each structure. It is shown that the E_eff is not only dependent on the porosity but also on the pore size variation.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 1; 259-262
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 83.

Tytuł:

Wtrącenia niemetaliczne w staliwie topionym w małym piecu indukcyjnym
Non-metallic Inclusions in Cast Steel Melted in a Small Induction Furnace

Autorzy:

Suchoń, J.
Studnicki, A.
Szajnar, J.

Powiązania:

https://bibliotekanauki.pl/articles/379961.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

staliwo
wtrącenia niemetaliczne
dodatki stopowe
cast steel
non-metallic inclusions
alloying additives

Opis:

Czynnikiem decydującym o jakości wielu stopów w tym szczególnie staliwa jest ilość, wielkość i rodzaj wtrąceń niemetalicznych. W prezentowanej pracy podjęto próbę określenia jak wpływają skład chemiczny, dodatki stopowe oraz sposób prowadzenia wytopu na ilość i rodzaj wtrąceń niemetalicznych.
Determinant of the quality of many alloys in particular cast a number of magnitude and type of non-metallic inclusions. In the present study attempts to determine how they affect the chemical composition, alloying elements and the manner in which the melt of the number and type of non-metallic inclusions.

Źródło:

Archives of Foundry Engineering; 2013, 13, 2 spec.; 93-97
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 84.

Tytuł:

Influence of mechanical damage on corrosion resistance of plates used in funnel chest treatment

Autorzy:

Krauze, A.
Kajzer, W.
Dzielicki, J.
Marciniak, J.

Powiązania:

https://bibliotekanauki.pl/articles/333157.pdf

Data publikacji:

2006

Wydawca:

Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych

Tematy:

stopy metali
biomateriały
uszkodzenie powierzchni
korozja
metallic alloys
biomaterials
surface damage
corrosion

Opis:

The paper presents influence of mechanical surface damage on corrosion resistance of plates made of Cr-Ni-Mo stainless steel, used in funnel chest treatment. The surface of the steel was electrochemically polished and fitted. The surface damage is induced in the given deformation regions and is a potential reason of corrosion. The corrosion tests were realised by recording of anodic polarization curves with the use of the potentio-dynamic method. The VoltaLab® PGP 201 system for electrochemical tests was applied. Additionally, the tests showed that the structure of the steel the plates were made of, met the PN-ISO 5832-1 standard. On the basis of the obtained results it can be stated that that stainless steel can be applied in funnel chest treatment.

Źródło:

Journal of Medical Informatics & Technologies; 2006, 10; 133-141
1642-6037

Pojawia się w:

Journal of Medical Informatics & Technologies

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 85.

Tytuł:

Odporność korozyjna stentów naczyniowych z biomateriałów metalowych
Corrosion resistance of vascular stents made of metallic biomaterials

Autorzy:

Walke, W.
Jurkiewicz, W.
Paszenda, Z.
Pochrząst, M.

Powiązania:

https://bibliotekanauki.pl/articles/283984.pdf

Data publikacji:

2008

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

stenty naczyniowe
biomateriały metalowe
odporność korozyjna
vascular stents
metallic biomaterials
corrosion resistance

Źródło:

Engineering of Biomaterials; 2008, 11, no. 77-80; 43-45
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 86.

Tytuł:

Functionalization of Gold Nanoparticles for the Detection of Heavy Metals in Contaminated Water Samples in the Province of Tayacaja

Autorzy:

Carbajal-Morán, Hipólito
Rivera-Esteban, Jesús M.
Aldama-Reyna, Claver W.
Mejía-Uriarte, Elsi V.

Powiązania:

https://bibliotekanauki.pl/articles/2173367.pdf

Data publikacji:

2022

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

functionalisation
metallic colloid
AuNps-Cys
pulsed laser
water
heavy metals
sonication dispersion

Opis:

The work consisted in functionalizing gold nanoparticles to analytically detect heavy metals in contaminated water; in Tayacaja-Huancavelica-Peru, using physical method of laser ablation. The 450 mJ/p Nd:YAG was used as a pulsed laser generator for the production of colloids from AuNPs by the top-down approach; the target was a 1 cm x 1.5 cm high purity gold metallic plate with a thickness of 1 mm, inside a 20 ml cuvette of deionized water, containing 5 ml of L-Cysteine ≥ 75% purity. Nanoparticle colloids were characterized by UV-Vis spectroscopy from 200 to 1160 nm range. Using a convex lens, the gold metal plate was ablated by the laser equipment, located 10 cm from the focus; with λ = 1064 nm and λ = 532 nm with energy equivalent to 60.28 mJ/p and 32.99 mJ/p respectively, with a ratio of 2 Hz, for 30 and 60 min. All the samples produced were subjected to the dispersion process by sonication at 40 KHz for one hour. The functionalized nanoparticles presented a resonance displacement of the maximum wavelength peak with respect to the reference at approximately 22.51 nm; consequently, the increase in diameter occurred at 52.10 nm. The sensitive capacity of the functionalized nanoparticles was verified for different concentrations of analytes in water, made up of divalent heavy metal ions Cd2+, Pb2+, and trivalent nonmetal As3+. At a concentration greater than 500 uM, the color of the functionalized nanoparticles turned bluish, due to the presence of positive ions. Therefore, it was stated that the functionalized nanoparticles enable the detection of heavy metals in water by color variation.

Źródło:

Journal of Ecological Engineering; 2022, 23, 9; 88--99
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 87.

Tytuł:

Preliminary Study of Frequency-Variable Vibration Packing Fabrication for Atomized Metallic Particulate Fuel Using Surrogate Spherical Powder

Autorzy:

Kim, Ki-Hwan
Ha, Seong-Jun
Park, Sang-Gyu
Kuk, Seoung-Woo
Park, Jeong-Yong

Powiązania:

https://bibliotekanauki.pl/articles/2049120.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

atomized powder
injection casting
metallic particulate fuel
alternative fabrication method
vibration packing

Opis:

An alternative fabrication method for metallic fuel in Gen-IV reactor was introduced with vibration packing of nuclear fuel particles to facilitate remote fabrication in a hot cell and reduce the generation of long-lived radioactive wastes. Vibration packing experiments on metallic particulate fuel using a surrogate 316L stainless steel powder were done to investigate the packing density and the uniformity of the simulated fuel according to the filling method and the vibration condition. Metallic particulate fuel filled with a pre-mixed power over all particles had the highest packing fraction and the most uniform distribution among the filling methods. The vibration packing method showed that it could fabricate the metallic particulate fuel having uniform distribution of spherical fuel particles through the adjustment of the filling method of the metallic powder and the vibration condition of the metallic particulate fuel.

Źródło:

Archives of Metallurgy and Materials; 2021, 66, 4; 1043-1047
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 88.

Tytuł:

Liquid-solid interaction during formation of nanocomposite systems

Autorzy:

Shtablavyi, I.
Mudry, S.
Kajak, P.

Powiązania:

https://bibliotekanauki.pl/articles/779001.pdf

Data publikacji:

2012

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

composite materials
liquid metals and alloys
metallic powders
microstructure
short-range order

Opis:

Structural changes in mixtures of liquid Bi with small Cu and Ni particles were studied at temperatur es of 615 and 1145K. Microstructures of the composites were observed (SEM) and analyzed after treatment at different temperatures and various durations of stirring. The structure of the mixtures of Bi with Cu(Ni) particles was investigated by means of X-ray diffraction, both in the solid and liquid state.

Źródło:

Polish Journal of Chemical Technology; 2012, 14, 4; 42-45
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 89.

Tytuł:

Fabrication and Compressive Properties of Open-Cell Ni-Mo-Cr (Hastelloy) Foams Manufactured by Electrostatic Powder Spraying

Autorzy:

Kang, Tae-Hoon
Kim, Kyu-Sik
Lee, Min-Jeong
Yun, Jung-Yeul
Lee, Kee-Ahn

Powiązania:

https://bibliotekanauki.pl/articles/356501.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

metallic foam
electrostatic powder spraying
Ni-Mo-Cr alloy
sintering
compressive property

Opis:

An open-cell Ni-Mo-Cr foam was newly manufactured using electrostatic powder spraying process and its room-temperature compressive properties were investigated in this study. For manufacturing Ni-Mo-Cr foam, Ni-Mo-Cr powders were sprayed on the polyurethane pre-form by electrostatic powder spraying process. And then, Ni-Mo-Cr powder sprayed pre-forms were sintered at 1200°C, 1250°C, and 1300°C, respectively. The relative densities of Ni-Mo-Cr foams were measured at 4 ~ 5%. Room tempera-ture compressive curves of ESP Ni-Mo-Cr foams represented the typical compressive 3-stages (elastic, plateau, densification) of open-cell metallic foam. As a result of observation of deformed specimen, the fracture mode found to be changed from brittle to ductile as sintering temperature increased. Based on these findings, correlations between structural characteristics, microstructure, and compressive deformation behavior were also discussed.

Źródło:

Archives of Metallurgy and Materials; 2020, 65, 3; 1081-1086
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 90.

Tytuł:

Research on the characteristics of the PEP coupling into a metallic via and stub interconnect

Autorzy:

Xiaofei, X.
Denghua, L.
Shuhui, Y.

Powiązania:

https://bibliotekanauki.pl/articles/140745.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

powerful electromagnetic pulse (PEP)
metallic via
stub interconnect
coupling characteristics
electromagnetic effect

Opis:

The research on the coupling electromagnetic effect was studied in this paper, in consideration of the wreaking damage of the powerful electromagnetic pulse to the electronic products. The characteristic of the metallic via and stub interconnect with the coupling voltage was calculated by the model, which was the transfer function F( f ) of the protection circuit parameters of DC power source. The research showed that: the smaller radius of Metallic via, the lower amplitude of F( f ), the less energy of a power electro- magnetic pulse (PEP); the higher increase of the width of the stub interconnect, the bigger reduction of the characteristic impedance of plane wave coupling, the depth of the notch band significantly narrowed. The simulations and experiments were done to compare the protection effects of protection circuits with different parameters at last. The results showed that the protection circuit designed could be highly advantageous in protecting the DC power source in this article.

Źródło:

Archives of Electrical Engineering; 2018, 67, 3; 683--694
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 91.

Tytuł:

Explosive crystallisation of metal glasses based on Fe-B during pulsed laser heating. Experiment and modelling

Autorzy:

Smolyakov, O.V.
Girzhon, V.V.
Mudry, S.I.
Nykyruy, Y.S.

Powiązania:

https://bibliotekanauki.pl/articles/24200617.pdf

Data publikacji:

2023

Wydawca:

Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach

Tematy:

explosion
crystallisation
metallic glass
structure modelling
eksplozja
krystalizacja
szkło metaliczne
modelowanie struktury

Opis:

Purpose: The structure evolution of amorphous metallic alloys during different kinds of thermal effects is an important problem of disordered systems physics. A precise evolutional model would allow predicting the formation of such a structural state, providing the necessary physical and mechanical alloy properties. Design/methodology/approach: The paper is devoted to the problem of modelling the explosive crystallisation process in metal glasses induced by laser, supplemented by experimental results. Findings: A theoretical model of laser-induced explosive crystallisation in metal glasses is proposed. A pulse laser heating method for the surface processing was developed, making it possible to obtain two-layer structures with an adjustable thickness of the amorphous crystalline layer. Research limitations/implications: The proposed model is assumed to test and optimes for metal glasses of other chemical compositions. Practical implications: A theoretical model of laser-induced explosive crystallisation in metal glasses allows for predicting and controlling structure changes to obtain the desired properties. Originality/value: The investigation of structure changes at rapid heating of amorphous alloys by experimental methods is very limited in obtaining data and their interpretation. For that reason, combining the modelling with experimental measurements is proposed. The results of this work have value for a scientist in material science, physics and engineering, which use nonequilibrium physical processes to obtain new materials, including nanoscale systems.

Źródło:

Archives of Materials Science and Engineering; 2023, 119, 2; 49--55
1897-2764

Pojawia się w:

Archives of Materials Science and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 92.

Tytuł:

Nonlinear optical study of 1,1-methylenedipyridinium bis[tetrachloride gold(III)] hybrid salt

Autorzy:

Zidan, M.
Al-Ktaifani, M.
Allahham, A.

Powiązania:

https://bibliotekanauki.pl/articles/1055075.pdf

Data publikacji:

2017-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

1,1'-methylenedipyridinium bis[tetrachloride gold (III)]
organic-metallic complex z-scan technique

Opis:

The third-order nonlinear optical properties of 1,1'-methylenedipyridinium bis[tetrachloride gold(III)] were investigated by the z-scan method using CW diode laser. The experimental results led to estimation of the nonlinear optical absorption coefficient (β), the nonlinear optical refraction (n₂), and third-order nonlinear optical susceptibility (χ³). Our results show that the excited-state absorption cross-sections (σ_{ex}) is larger than the ground-state absorption cross-sections (σ_{g}), this suggests that the nonlinear optical absorption in the MPTC gold(III) is due to the reverse saturable absorption mechanism. Furthermore, the obtained results suggest that our material is considered as a promising candidate for future optical devices applications.

Źródło:

Acta Physica Polonica A; 2017, 132, 4; 1379-1382
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 93.

Tytuł:

Analysis of the Manufacturing Process of Metal Layers in Ceramic Molds of the Burnt-out Models

Autorzy:

Jesiotr, M.
Myszka, D.
Wierzchoń, T.

Powiązania:

https://bibliotekanauki.pl/articles/947455.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

investment casting
polymer patterns
metallic surface layer
odlewnia
formy polimerowe
warstwa powierzchniowa metaliczna

Opis:

This paper presents an innovative casting method that allows manufacturing the layers on the cast by applying the metallic coating inside the mold. In order to define the possibilities of formation of the metal layers on the castings attempts were made to modify the mold and the cast for models created of two selected plastic materials. The main issue was the choice of a suitable coating material and a casting alloy. The procedure was projected in a manner that would enable the model polymer coating to get into reaction with the cast liquid metal after the burn away. The adjustment of the casting cavity was obtained by the nickel coating. The pit was then filled with the aluminum alloy, when studying the aspects of diffusion and adhesion between the two metals (Ni and Al). On the assumption that nickel coating will generate a diffusion connection with the cast material, it is potential to create intermetallic phases of the system of Ni- Al that will modify the surface attributes of the molding surface. Such designed is to obtain, in a single operation, a ready casting part with a diffusion layer surface.

Źródło:

Archives of Foundry Engineering; 2014, 14, 1 spec.; 73-76
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 94.

Tytuł:

Laboratory studies on the development of composite pellets for deep refining of steel from non-metallic inclusions
Badania laboratoryjne nad opracowaniem kompozytowych grudek do głębokiej rafinacji stali z wtrąceń niemetalicznych

Autorzy:

Szypuła, I.
Zdonek, B.

Powiązania:

https://bibliotekanauki.pl/articles/181568.pdf

Data publikacji:

2018

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Metalurgii Żelaza im. Stanisława Staszica

Tematy:

steel
non-metallic inclusions
refining
composite pellets
stal
wtrącenia niemetaliczne
rafinacja
grudka kompozytowa

Opis:

The paper presents the laboratory research on the development of a new type of refining materials in the form of composite pellets for deep refining of steel from non-metallic inclusions, measured by the total oxygen content in steel below 10 ppm and the average size of non-metallic inclusions below 3 μm. The study included the development of a technology for pelletising materials selected for composite pellets, development of a technology for drying and hardening of pellets, making a batch of pellets and a series of laboratory heats using the produced pellets, assessment of the usefulness of composite pellets for industrial research, and development of assumptions for these tests.
Przedstawiono badania laboratoryjne nad opracowaniem nowego rodzaju rafinacyjnych materiałów w postaci kompozytowych grudek do głębokiej rafinacji stali z wtrąceń niemetalicznych, mierzonej zawartością tlenu całkowitego w stali poniżej 10 ppm i średnią wielkością wtrąceń niemetalicznych, poniżej 3 µm. Opracowano technologię grudkowania materiałów dobranych na kompozytowe grudki, opracowano technologię suszenia i utwardzenia grudek, wykonano partię grudek oraz serię laboratoryjnych wytopów z wykorzystaniem wytworzonych grudek, dokonano oceny przydatności grudek kompozytowych do badań przemysłowych oraz opracowano założenia do tych badań.

Źródło:

Prace Instytutu Metalurgii Żelaza; 2018, T. 70, nr 3, 3; 25-31
0137-9941

Pojawia się w:

Prace Instytutu Metalurgii Żelaza

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 95.

Tytuł:

Wpływ technologii wytapiania stali z dodatkiem stopowym 3÷5% Al na rodzaj i morfologię wtrąceń niemetalicznych
The effect of melting technology of steel with addition of 3÷5% Al on the type and morphology of non-metallic inclusions

Autorzy:

Adamczyk, M.
Niżnik-Harańczyk, B.
Pogorzałek, J.

Powiązania:

https://bibliotekanauki.pl/articles/181802.pdf

Data publikacji:

2016

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Metalurgii Żelaza im. Stanisława Staszica

Tematy:

stal
glin
wtrącenia niemetaliczne
analiza ilościowa
alluminium
steel
non-metallic inclusions
quantitative analysis

Opis:

W artykule przedstawiono wyniki badań wpływu warunków wytapiania i odlewania eksperymentalnych stali zawierających 3÷5% glinu na rodzaj i morfologię wtrąceń niemetalicznych. Wytopy badawcze wykonano w elektrycznym piecu indukcyjnym z zastosowaniem próżni oraz w atmosferze powietrza. Przeprowadzono analizę ilościową i jakościową wtrąceń niemetalicznych po przeróbce plastycznej na gorąco. W stalach wytapianych i odlewanych w powietrzu występują głównie wtrącenia AlN, MnS, Al2O3 oraz złożone wtrącenia tlenkowo-siarczkowe. Udział objętościowy wszystkich wtrąceń niemetalicznych stanowi 0,10÷0,12% obj. i jest większy o ok. 30% w porównaniu ze stalą wytapianą w próżni.
The paper presents the effect of melting and casting conditions of experimental steels with 3÷5% of aluminium on the type and morphology of non-metallic inclusions. The experimental heats were carried out in an electric induction furnace in vacuum and in air atmosphere. A quantitative and qualitative analysis of non-metallic inclusions was conducted after hot plastic working. Steels which were melted and casted in air atmosphere contain mainly AlN, MnS, Al2O3 and complex oxide-sulfide inclusions. The volume fraction of non-metallic inclusions was 0.10÷0.12% and it was about 30% higher than the volume of inclusions in the steel produced in vacuum.

Źródło:

Prace Instytutu Metalurgii Żelaza; 2016, T. 68, nr 2, 2; 24-32
0137-9941

Pojawia się w:

Prace Instytutu Metalurgii Żelaza

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 96.

Tytuł:

Mechanical properties of Ni-Fe-Cu-P-B alloy produced by two component melt spinning (TCMS)

Autorzy:

Wojciechowska, M.
Ziewiec, K.
Kąc, S.
Prusik, K.

Powiązania:

https://bibliotekanauki.pl/articles/351728.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

metallic glasses
scanning electron microscopy (SEM)
nanoindentation
transmission electron microscopy TEM
mechanical properties

Opis:

The aim of this work was to investigate the microstructure and mechanical properties of the two-component melt-spun (TCMS) alloy produced from Ni₄₀Fe₄₀B₂₀ and Ni₇₀Cu₁₀P₂₀ melts. The Ni₄₀Fe₄₀B₂₀, Ni₇₀Cu₁₀P₂₀, Ni₅₅ Fe₂₀ Cu₅ P₁₀ B₁₀ alloys were arc-melted. Then the alloys were melt-spun in the two different ways i.e.: by casting from a single-chamber crucible and from the two-chamber crucible. All of the above mentioned alloys were processed in the first way and the Ni₄₀Fe₄₀B₂₀ and Ni₇₀Cu₁₀P₂₀ were simultaneously cast on the copper roller from the two-chamber crucible. The microstructure of the alloy was studied using transmission electron microscopy (TEM), scanning electron microscopy (SEM) with energy dispersive spectrometry (EDS) and light microscopy. The mechanical properties were investigated using tensile testing and nanoindentation. The two-component melt-spun (TCMS) amorphous Ni₅₅ Fe₂₀ Cu₅ P₁₀ B₁₀ alloy present hardness, tensile strength and Young modulus on the significantly higher level than for a single phase amorphous Ni₅₅ Fe₂₀ Cu₅ P₁₀ B₁₀ alloy and slightly below the corresponding values for the Ni₄₀Fe₄₀B₂₀.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 1; 137-140
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 97.

Tytuł:

The Effect of the Diameter and Spacing Between Impurities on the Fatigue Strength Coefficient of Structural Steel

Autorzy:

Lipiński, T.

Powiązania:

https://bibliotekanauki.pl/articles/352827.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

steel
structural steel
non-metallic inclusions
oxide impurities
fatigue strength coefficient
bending fatigue

Opis:

The article discusses the effect of the diameter and spacing between impurities (size up to 2 μm) on the fatigue strength coefficient of structural steel during rotary bending. The study was performed on 21 heats produced in an industrial plant. Fourteen heats were produced in 140 ton electric furnaces, and 7 heats were performed in a 100 ton oxygen converter. All heats were desulfurized. Seven heats from electrical furnaces were refined with argon, and heats from the converter were subjected to vacuum circulation degassing. Steel sections with a diameter of 18 mm were hardened for 30 minutes from the austenitizing temperature of 880°C and tempered at a temperature of 200, 300, 400, 500 and 600°C. The experimental variants were compared in view of the applied melting technology and heat treatment options. The results were presented graphically and mathematically to account for the correlations between the fatigue strength coefficient during rotary bending, the diameter of and spacing between submicroscopic impurities. Equations for calculating the fatigue strength coefficient at each tempering temperature and a general equation for all tempering temperatures were proposed. Equations for estimating the fatigue strength coefficient based on the relative volume of submicroscopic non-metallic inclusions were also presented. The relationship between the fatigue strength and hardness of highgrade steel vs. the quotient of the diameter of impurities and the spacing between impurities, and the fatigue strength and hardness of steel vs. the relative volume of submicroscopic non-metallic impurities were determined.

Źródło:

Archives of Metallurgy and Materials; 2018, 63, 1; 519-524
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 98.

Tytuł:

Effect of Cone Size on the Bonding Strength of Bimetallic Composite Pipes Produced by Drawing Approach

Autorzy:

Zheng, M.
Zhao, T.
Gao, H.
Teng, H.
Hu, J.

Powiązania:

https://bibliotekanauki.pl/articles/352274.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

bi-metallic composite pipe
drawing approach
cone size
interfacial bonding strength
ideal elastoplastic

Opis:

The effect of cone size on interfacial bonding strength of bimetallic composite pipe manufactured by drawing approach is studied on base of the plane strain assumption and ideal elastic-plastic model, a simple expression for the effect of cone size on the bonding strength of bimetallic composite pipes is proposed. The agreement of the predicted results with the experimental results shows the reliability.

Źródło:

Archives of Metallurgy and Materials; 2018, 63, 1; 451-456
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 99.

Tytuł:

Metoda oceny przydatności ciekłych powłok z tworzyw niemetalicznych powlekających metalowe konstrukcje
The method to assess suitability of liquid coatings of non-metallic materials that coat the metal structures

Autorzy:

Jamroziak, K.
Piesiak, S.
Jarguliński, W.

Powiązania:

https://bibliotekanauki.pl/articles/137206.pdf

Data publikacji:

2013

Wydawca:

Uczelnia Jana Wyżykowskiego

Tematy:

powłoki niemetaliczne
kąt zwilżania
konstrukcje metalowe
non-metallic layers
contact angle
metal structures

Opis:

Powlekanie metalowych konstrukcji pracujących zmęczeniowo w powietrzu lub wodzie jest zadaniem niezmiernie ważnym. Powłoki mające w większości wieloskładnikową zawartość mają chronić metalowe konstrukcje przed korozją i wnikaniem wodoru będącego przyczyną kruchości. Materiały powłokowe nanosi się na metalowe powierzchnie różnymi metodami. Mają one wspólną cechę – są cieczami. Muszą więc wykazywać się pewnymi cechami takimi, jak: napięcie powierzchniowe, kąt zwilżania powierzchni metalu czy siła adhezji przylegania do niej wynikająca z istnienia tego kąta adhezji i napięcia powierzchniowego. Istnieje wiele metod pomiarów kąta zwilżania i napięcia powierzchniowego. W pracy przedstawiono propozycje pomiaru kąta zwilżania metodą fotograficzną. Pomiary te można przeprowadzać w terenie na poziomych powierzchniach metalowych konstrukcji przed ich pomalowaniem. Do wyznaczania cofającego kąta zwilżenia wybrano metodę leżącej kropli. Napięcie powierzchniowe mierzymy metodą stalagmometryczną spadających kropli. Mając kąt zwilżania i napięcie powierzchniowe, wyliczamy siłę adhezji ciekłej powłoki do metalu konstrukcji. Na podstawie takich pomiarów można wybrać najlepsze ciekłe tworzywo powłokowe pod względem zwilżania metalu i siły adhezji do niego.
Coating the metal constructions which work in air or water is an extremely important issue. These coatings are usually composed of many components to protect metal structures against corrosion and penetration of hydrogen that may cause brittleness. There are many methods to apply the coating materials to the metal surfaces. These materials have one in common: they are liquids. So they must have a certain characteristics, such as: surface tension, contact angle of the surface of the metal or adhesive force resulting from the existence of the angle of adhesion and the surface tension. There are many methods of measuring the contact angle and surface tension. The paper proposes method for measuring the contact angle by photographic method. These measurements can be carried out in the field on the horizontal surfaces of the metal construction prior to its painting. The sessile drop technique has been chosen to determine the receding contact angle. Surface tension is measured by the stalagmometric method of falling drops. When we have the contact angle and the surface tension, we can calculate the adhesion force of the liquid coating to the metal of the construction. Based on these measurements, the best liquid coating material can be chosen in terms of the metal wetting and the adhesion force.

Źródło:

Zeszyty Naukowe Dolnośląskiej Wyższej Szkoły Przedsiębiorczości i Techniki. Studia z Nauk Technicznych; 2013, 2; 63-72
2299-3355

Pojawia się w:

Zeszyty Naukowe Dolnośląskiej Wyższej Szkoły Przedsiębiorczości i Techniki. Studia z Nauk Technicznych

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 100.

Tytuł:

Heterogeneity of glass components in slag after nickel acquisition process from Kola Peninsula (Russia)
Niejednorodność składników zeszklonego żużla pochodzącego z procesu hutniczego rud niklu z Półwyspu Kolskiego (Rosja)

Autorzy:

Kasikov, A.
Neradovsky, Y.
Huber, M.
Mayorova, Y.
Rakitina, E.
Grishin, N.

Powiązania:

https://bibliotekanauki.pl/articles/263890.pdf

Data publikacji:

2017

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

metallic glass
slags
nickel metallurgy
de-sulphating
metaliczne szkło
żużel
metalurgia niklowa
odsiarczanie

Opis:

The problem of the disposal of metallurgical slags in the copper-nickel industry also remains open in the Kola Peninsula area, where this kind of exploitation and processing of sulphide Cu-Ni deposits is conducted. The urgent need is to reuse the waste slag heaps through the effective manner of their use based on our available technologies. The slag obtained after processing sulphide copper-nickel ores in the Kola Peninsula contains about 4 wt.% of the ore. The chemical and mineral composition of the slag plays a key role when considering the possibility of its re-use in the context of environmental nuisance. The line of processing Cu-Ni sulfide deposits from the slag proposed by the authors is based on the ability to change the slag phase composition by its oxidation and reduction processes for the enrichment of ore mineralization for reuse.
Kwestia utylizacji żużli hutniczych przemysłu miedziowo-niklowego pozostaje otwarta również na Półwyspie Kolskim, gdzie jest prowadzona eksploatacja i obróbka siarczkowych złóż Cu-Ni. Pilną potrzebą jest ponowne wykorzystanie hałd. W tym celu, przy zastosowaniu dostępnych technologii, poddaje się je efektywnemu przetworzeniu. Podczas przetwarzania siarczkowych rud miedzi z niklem w żużlu pozostaje około 4% wag. minerałów rudy. O ponownym wykorzystaniu żużla decyduje jego chemiczny i mineralny skład, który nie może zagrażać naturalnemu środowisku. Zaproponowany przez autorów projekt linii przetwarzania osadów siarczków Cu-Ni z żużla zakłada uzyskanie zmiany składu fazowego żużla w wyniku utleniania i redukcji w trakcie obróbki cieplnej, koniecznej do wzbogacenia mineralizacji rudnej, a tym samym do jej ponownego użycia.

Źródło:

Metallurgy and Foundry Engineering; 2017, 43, 2; 89-96
1230-2325
2300-8377

Pojawia się w:

Metallurgy and Foundry Engineering

Dostawca treści:

Biblioteka Nauki

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