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Wyszukujesz frazę "Microstructure" wg kryterium: Temat


Tytuł:
Structure and Thermoelectric Properties of Inconel 625/Pt Microjoint
Autorzy:
Boczkal, G.
Dadun, K.
Palka, P.
Hotlos, A.
Janoska, M.
Powiązania:
https://bibliotekanauki.pl/articles/355433.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
microjoint
thermocouple
microstructure
Opis:
A method of using the electric charge in a capacitor was applied for the manufacture of thermocouple micro-joints. The motivation for the study was the need to produce a stable welded connection without affecting the geometry of the substrate, which was a thin sheet of Inconel 625 alloy (UNS designation N06625). Within the framework of the research work, a suitable workstation for micro-joints elaboration was built and welding experiments were performed using different electric charges. Studies carried out within the framework of the present work have shown that joints based on Inconel 625 alloy and platinum have the best application properties in the range of small-scale temperature measurements. They can be used, e.g., for monitoring the temperature distribution on the inner surfaces of electric motor casings. An undeniable advantage is in this case the high thermal resistance of both materials used to produce the joint, i.e. the Inconel 625 alloy and platinum. This allows them to be used at high temperatures under atmospheric conditions.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 197-200
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of Microstructure in ADI Castings
Autorzy:
Guzik, E.
Sokolnicki, M.
Królikowski, M.
Ronduda, M.
Nowak, A.
Powiązania:
https://bibliotekanauki.pl/articles/353713.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
prediction of microstructure
ADI castings
results of the ADI microstructure examinations
Opis:
Tests were carried out on samples of low-alloy ductile iron with additions of Ni, Cu and Mo, subjected to austempering heat treatment. The samples were austenitized at 850, 900 and 950 °C, and then austempered at T = 210, 240, 270, 300 and 330 °C. The ausferritizing treatment was carried out in a salt bath for the time τ = 2 - 8 hours. Additionally, tests and studies covered samples subjected to the ausferritizing treatment at 270 °C with the time of holding castings in a bath from 2 to 24 hours. Evaluation covered the results of the ADI microstructure examinations and hardness measurements. The ADI matrix morphology was identified counting the average number of ausferrite plates and measuring their width and spacing. The regression equations HB = f (τ, T) and τ = f (HB, T) were derived to establish the, so-called, “process window”, allowing obtaining a priori the required microstructure of ADI and, consequently, the required mechanical properties, mainly hardness, shaping the functional properties of castings, abrasion wear resistance – in particular.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 2159-2164
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrothermal Synthesis, Impedance and Optical Properties of Tm-Doped SrBi2Nb2O9 Ceramics
Autorzy:
Afqir, Mohamed
Stojadinović, Stevan
Elaatmani, Mohamed
Zegzouti, Abdelouahad
Tahiri, Nabiha
Daoud, Mohamed
Powiązania:
https://bibliotekanauki.pl/articles/2048872.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hydrothermal
microstructure
impendence
luminescent
Opis:
In this study, Strontium Bismuth Niobate (SrBi2-xTmxNb2O9 with 0 ≤ x ≤ 0.1) doped by Tm was synthesized using by the hydrothermal method. The microstructure and electrical properties were mainly investigated. XRD analysis showed a single-phase orthorhombic structure for Tm-doped SrBi2Nb2O9 samples. The crystallite size is anisotropic and the strain is apparently independent of Tm amount. Dielectric properties for doped SrBi2Nb2O9 with Tm3+ ion have the same trend discussed for the pure sample. FTIR resulats showed that NbO6 octahedral is formed, on one hand, and on the other hand, it shows that spectras for doped and undoped samples are nearly the same. The Cross-section of ceramics showed the plate-like morphology, also the distribution of the pore in ceramics are observed for all samples. Tm dopants produce only minor changes in the impendence parameter values at room temperature. The luminescent (PL) properties of Tm-doped SrBi2Nb2O9 ceramic powders were investigated. The optimum Tm3+ concentration for the maximum PL intensity was found to be at x = 0.075.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 1; 45-50
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The concept of discourse in terms of cognitive linguistics
Autorzy:
Babayeva, Nigar O.
Powiązania:
https://bibliotekanauki.pl/articles/40409777.pdf
Data publikacji:
2024-03-31
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
discourse
text
macrostructure
microstructure
Opis:
At the end of the 20th century, the term discourse, which was justified by European linguists, gained relevance in modern linguistics and gave rise to wider research. The ideas about the discourse in the scientific literature have given impetus to each other and facilitated a wider analysis of this term. In Azerbaijani linguistics, this topic is considered a younger field of science. From this point of view, we decided to conduct research in the mentioned direction. In the article, the types of discourse from the point of view of both structure and functionality, and the problems of its comparison with the text are considered.
Źródło:
Reality of Politics; 2024, 27; 7-17
2082-3959
Pojawia się w:
Reality of Politics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On dynamic of substructured shells
Autorzy:
Woźniak, C.
Powiązania:
https://bibliotekanauki.pl/articles/280224.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
shells
microstructure
modelling
dynamics
Opis:
The contribution outlines a general modelling method leading from the general equations of thin shells with locally periodic structure to the averaged equations with slowly varying coefficents. The proposed model describes the effects of periodicity cell size on the overall shell response and hence can be applied to the dispersive analysis in dynamic problems.
W pracy przedstawiono metodę prowadzącą od 2D-modelu cienkich powłok o lokalnie periodycznej strukturze do uśrednionych równań o wolno zmiennych współczynnikach. Otrzymane równania opisują wpływ wielkości mikrostruktury na reakcje powłoki i są dogodne zastosowania w analizie zagadnień dynamicznych.
Źródło:
Journal of Theoretical and Applied Mechanics; 1999, 2; 255-265
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and properties of alloyed silver-gold nanoparticles
Autorzy:
Prymak, O.
Ristig, S.
Meyer-Zaika, W.
Raabe, D.
Epple, M.
Powiązania:
https://bibliotekanauki.pl/articles/285180.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
nanoparticles
microstructure
alloyed nanoparticles
Opis:
Alloyed silver-gold nanoparticles recently raised an interest in biomedicine as potential antibacterial and surface-functionalized agents for imaging, drugdelivery, and tumor thermo-therapy [1,2]. The here synthesized alloyed AgAu nanoparticles with different compositions of silver and gold, as determined by atomic absorption spectroscopy (AAS), were prepared by reduction with citrate and tannic acid in aqueous media and subsequently functionalized by the addition of polyvinylpyrrolidone (PVP) [3]. UV spectroscopy confirmed that the particles consisted of alloyed Ag:Au and are not of a separate core-shell structure. The resulting nanoparticles were monodisperse and had a uniform size of ~6 nm, except pure Ag and Ag:Au-90:10, as shown by differential centrifugal sedimentation (DCS) and transmission electron microscopy (TEM). By means of X-ray powder diffraction (XRD) and use of Rietveld refinement [4], the precise lattice parameters, crystallite size and microstrain were determined. Based on the results by XRD, DCS and TEM it was shown, that the nanoparticles were not twinned, except pure Ag and Ag:Au-90:10. Additionally, a distinct deviation from Vegard’s linear rule of alloy mixtures for the lattice parameter was found for the nanoparticles. This effect was also found for AgAu bulk materials, but was much more pronounced in the nanostate. Further investigations of the crystal structure of the alloyed nanoparticles by means of synchrotron radiation might be helpful to gain more information about the interactions of silver and gold atoms.
Źródło:
Engineering of Biomaterials; 2014, 17, no. 128-129; 77
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Properties of the S49 Rail after a Long Term Outdoor Exposure
Autorzy:
Konieczny, Jarosław
Labisz, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2172345.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
microstructure
perlite
ferrite
hardness
Opis:
The subject of the research in this work was the S49 rail made of R260 rail steel (1.0623). The carried out investigations concern microstructure tests and tests of mechanical properties of rails after several years of exposure in the open air without usage. The purpose of the work was to determine on the basis of the results of research the possibilities of using the tested rail for usage and application for the construction of tracks on railway sidings. For investigations there were used diverse techniques reaching such engineering materials investigations like light or scanning electron microscope for microstructure investigations, as well as hardness and microhardness test were performed for determinations of the microstructural changes occurred in the upper area of the rails surface. The microstructure changes concerns especially the ferritic and pearlitic structure and the breaks in the present carbide mesh. During investigations it was found out that the tested railway rails are fully useful for application, after machining to achieve required dimensional parameters. It is also of high importance, of the economical point of view, that their price, also in case of earlier installation of the rails, may be lower than the current price offered on the marked for a entire new product. The price difference reaches dimensions in the range of 5% - 10%.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 2; 280--290
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of microstructure and chemistry of carbon nanomaterials coatings on nerve cells
Autorzy:
Frączek-Szczypta, A.
Wedel-Grzenda, A.
Jantas, D.
Powiązania:
https://bibliotekanauki.pl/articles/285693.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
carbon nanomaterials
nerve cells
microstructure
Źródło:
Engineering of Biomaterials; 2016, 19, 138; 119
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructures of Metallurgical Slags
Autorzy:
Jonczy, I.
Powiązania:
https://bibliotekanauki.pl/articles/351078.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metallurgical slag; microstructure
phase composition
Opis:
The article characterizes microstructures of metallurgic slag of varying age remaining from the production of iron and steel and the Zn-Pb ore processing in relation to magmatic rocks and ores. Based on microscopic observations - among others - hypocrystalline, hyaline and felsite (characteristic for magmatic rocks) microstructures were observed in the slag. Also microstructures related to ores, including framework and dendritic, colomorphic and corrosive structures were noted. The diversity of the microstructures presented in the article is a result of the differentiation in the formations of individual components of the slags, which depends, inter alia, on the method and the rate of cooling of the alloys.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 61-66
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wear Characteristics of FeW/FeW-B4C Coatings Produced by TIG Process
Autorzy:
Islak, S.
Powiązania:
https://bibliotekanauki.pl/articles/351663.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wear
coating
microstructure
TIG process
Opis:
In this study, wear properties of FeW-B4C coatings produced by tungsten inert gas (TIG) process on the AISI 1060 steel were investigated. TIG process was selected because it is a cost-effective approach for melting-based coatings. The treated surfaces were evaluated and characterized by means of scanning electron microscope (SEM), X-ray diffraction analysis, and electron dispersive spectrometry (EDS). The microhardness and wear experiment were also performed by using a microhardness machine and ball-on-disk tribometer. SEM observations showed that the obtained coating had a smooth and uniform surface. According to XRD analysis, borides and carbides phases formed in the coatings. The wear behavior of the coatings was compared with ball-on-disc configuration wear tests, at the same conditions. Average coefficient of friction values of the coatings were obtained at relatively low levels.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 4; 2001-2006
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical and corrosion properties of magnesivm-bioceramic nanocomposites
Autorzy:
Kowalski, K.
Nowak, M.
Jurczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/352234.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bionanocoinposites
magnesium
bioceramics
microstructure
bionanocomposites
Opis:
Mechanical and corrosion properties of magnesivm-bioceramic nanocomposites Magnesium alloys have recently attracted much attention as a new generation of biodegradable metallic materials. In this work, MglMnlZn0.3Zr-bioceramic nanocomposites and their scaffolds were synthesized using a combination of mechanical alloying and a space-holder sintering process. The phase and microstructure analysis was carried out using X-ray diffraction, scanning electron microscopy and the properties were measured using hardness and corrosion testing equipment. Nanostructured Mg-bioceramic composites with a grain sizes below 73 run were synthesized. The Vickers hardnesses for the bulk nanostructured Mg-based composites are two times greater than that of pure rnicrocrystalline Mg metal (50 HV0.3). Produced Mg-based bionanomaterials can be applied in medicine.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1437-1440
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Forecasting the distribution of precipitate diameters in the presence of changes in the structure of the material
Autorzy:
Zieliński, A.
Miczka, M.
Golański, G.
Powiązania:
https://bibliotekanauki.pl/articles/356680.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
microstructure
precipitates
statistics
forecasting
ageing
Opis:
The results of investigations on the microstructure of T23 and T24 low-alloy steels as well as P91 and P92 high-chromium steels in the as-received condition and after 70.000 h annealing at 550-650°C are presented. The quantitative analysis of the existing precipitates was performed for representative images of microstructure. The statistical analysis of collected data allowed the parameters of a selected theoretical statistical distribution to be estimated. A forecast of average precipitate diameter and standard deviation of such a distribution for the time of 100,000 hours at 550 and 600°C for T23 and T24 steels and at 600 and 650°C for P91 and P92 steels was calculated. The obtained results of investigations have made it possible to compare changes in the microstructure of various steel grades due to long-term impact of elevated temperature. They have also confirmed the possibility of using, in evaluating the degradation degree of materials in use, the forecasting methods that derive from mathematical statistics, in particular the theory of stochastic processes and forecast by analogy methods. The presented approach allows the development of a forecast of precipitate diameter probability density under the microstructure instability conditions for selected steel grades. The assessment of material condition that takes into consideration, but is not limited to, the precipitate diameter measurement is useful as an assessment component in estimating the time of safe service of power unit elements working under creep conditions.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 1; 273-280
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Omówienie norm ASTM stosowanych w badaniach mikrostruktury
Autorzy:
Hubner, K. J.
Powiązania:
https://bibliotekanauki.pl/articles/274225.pdf
Data publikacji:
2013
Wydawca:
Roble
Tematy:
normy ASTM
standardy międzynarodowe
badania mikrostruktury
mikrostruktura
ASTM norms
international standards
microstructure investigation
microstructure
Źródło:
LAB Laboratoria, Aparatura, Badania; 2013, 18, 1; 52-55
1427-5619
Pojawia się w:
LAB Laboratoria, Aparatura, Badania
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the differentiation of structural and physicochemical properties of orthodontic wires of AISI 304 stainless steel
Autorzy:
Grygier, D.
Hoppe, V.
Zięty, A.
Rutkowska-Gorczyca, M.
Powiązania:
https://bibliotekanauki.pl/articles/284164.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
stainless steel
orthodontics wire
microstructure
Opis:
Wires used for orthodontic arches play a very important role in the process of orthodontic treatment. In combination with the lock attached to the tooth, they move and align the teeth along the set trajectories. Wires of stainless steel are commonly used in orthodontics for several reasons: they are characterised by high resistance to corrosion, high strength and elasticity, formability and a possibility of obtaining defined properties through cold working and annealing during production process. The purpose of the research presented in the work is the analysis of differences of the selected structural properties in the context of corrosion resistance of the orthodontic wire material. The object of the research was edge arches of the 0.016”x0.022” size made of the stainless steel type AISI 304, provided by two different producers: G&H Orthodontics and Adenta. The research methodology involved analysis of chemical and phase composition of the tested alloy, microscopic tests with application of the light and electron microscopy methods, as well as electrochemical direct current measurements. The research presented in the work has shown significant differences in structural and physical-chemical properties of the orthodontic wires made of AISI 304 type stainless steel. Despite the fact, that the tested arches were manufactured of the theoretically the same materials, but by different producers, they significantly differ in chemical composition, metallurgical purity, phase composition and corrosion resistance. In addition, it is worth noticing that the tested materials, in terms of structure, do not meet the normative requirements obligatory for biomaterials.
Źródło:
Engineering of Biomaterials; 2018, 21, 146; 8-13
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modification of microparticles’ microstructure with carbon dioxide for application as cell carriers in modular tissue engineering
Autorzy:
Mielan, B.
Krok-Borkowicz, M.
Pamuła, E.
Powiązania:
https://bibliotekanauki.pl/articles/284508.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
carbon dioxide
tissue engineering
microstructure
Źródło:
Engineering of Biomaterials; 2018, 21, 148; 102
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł

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