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Wyświetlanie 1-15 z 68
Tytuł:
Effects of PVA Polymer Type and Calcination Temperature on Synthesis of Nanocrystalline Yttria Powder by Polymer Solution Route
Autorzy:
Yang, Y.-K.
Lee, S.-J.
Powiązania:
https://bibliotekanauki.pl/articles/356024.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
yttria
PVA
nanocrystalline
synthesis
nanowire
Opis:
Nano-sized yttria (Y2O3) powders were synthesized by a polymer solution route using polyvinyl alcohol (PVA) as an organic carrier. The PVA polymer affected the dispersion of yttrium ions in precursor sol. In this study, three kinds of PVA polymer (different molecular weight) were applied for synthesis of yttria powder. The PVA type as well as calcination temperature had a strongly influence on the particle morphology. Single crystal nano wire particles were observed at the temperature of polymer burn out range and the size was dependent on the PVA type. The stable, fully crystallized yttria powder was obtained through the calcination at 800°C for 1 h. The yttria powder prepared with the high weight PVA (MW: 153,000) revealed a particle size of 30 nm with a surface area of 18.8 m2/g.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 3; 1473-1476
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure studies of amorphous and nanocrystalline (Fe1-xCox)85.4Zr6.8-yMyB6.8Cu1 (x = 0 or 0.1, y = 0 or 1, M = Mo, Nb or Nd) alloys
Autorzy:
Olszewski, J.
Zbroszczyk, J.
Fukunaga, H.
Ciurzyńska, W.
Świerczek, J.
Hasiak, M.
Perduta, K.
Łukiewska, A.
Młyńczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/147229.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Invar effect
nanocrystalline alloys
interfacial zone
Opis:
The amorphous and nanocrystalline (Fe1 xCox)85.4Zr6.8 yMyB6.8Cu1 (x = 0 or 0.1, y = 0 or 1, M = Mo, Nb or Nd) alloys were studied using Mössbauer spectroscopy. We have stated that after the low temperature annealing of the samples the decrease of the average hyperfine field due to the Invar effect was observed. This effect is associated with the increase of atom packing density after the annealing of the samples, which may lead to the noncolinear spin state in some regions. This phenomenon was completely suppressed after substitution of 10% of Fe atoms by Co atoms. At early stages of crystallization of the Fe85.4Zr6.8 yMyB6.8Cu1 (y = 0 or 1, M = Mo, Nb or Nd) alloys, the interfacial zone is poor in iron due to diffusion of Zr, B, Nb, Mo and Nd atoms outside regions where á-Fe fine grains are created. However, the iron content in the amorphous matrix is the same as in the as-quenched state. The iron concentration in the interfacial zone of the nanocrystalline alloys obtained by the accumulative annealing depends on the chemical composition of the as-quenched samples. In the nanocrystalline samples obtained by two-step annealing, the iron content in the interfacial layer is higher than in the amorphous matrix.
Źródło:
Nukleonika; 2004, 49,suppl.3; 79-83
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ordering of alfa-FeCo phase in the nanocrystalline Fe83-xCoxNb3B13Cu1 (x = 6, 25 or 41.5) alloy
Autorzy:
Zbroszczyk, J.
Młyńczyk, A.
Olszewski, J.
Ciurzyńska, W.
Wysłocki, B.
Perduta, K.
Lelątko, J.
Nabiałek, M.
Powiązania:
https://bibliotekanauki.pl/articles/148219.pdf
Data publikacji:
2007
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
nanocrystalline alloys
microstructure
ordering
Mössbauer spectroscopy
Opis:
The microstructure and ordering of alfa-FeCo phase of the nanocrystalline Fe83 xCoxNb3B13Cu1 (x = 6, 25 or 41.5) alloys were investigated. We have stated that á-FeCo phase is atomically ordered in the Fe83 xCoxNb3B13Cu1 (x = 25 or 41.5) samples crystallized by the heat treatment in a furnace. However, after flash annealing (by current or laser) that phase is disordered. Moreover, we have found that Co concentration in the crystalline alfa-FeCo phase strongly depends on Co content in the as-quenched ribbons. The annealing conditions influence also the grain diameter of the crystalline phase. In the nanocrystalline alloys obtained by a flash annealing of the amorphous ribbons finer grains are present.
Źródło:
Nukleonika; 2007, 52, supl. 1; 29-32
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanocrystallization studies of rapidly quenched Fe85.4-xCoxZr6.8-yNbyB6.8Cu1 (x = 0 or 42.7, y = 0 or 1) alloys
Autorzy:
Olszewski, J.
Zbroszczyk, J.
Ciurzyńska, W.
Fukunaga, H.
Wysłocki, B.
Perduta, K.
Łukiewska, A.
Młyńczyk, A.
Lelątko, J.
Świerczek, J.
Powiązania:
https://bibliotekanauki.pl/articles/148787.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Mössbauer spectra
nanocrystalline Fe-Co alloys
Opis:
The microstructure of amorphous and nanocrystalline Fe42.7Co42.7Zr6.8-xNbxB6.8Cu1 (x = 0 or 1) alloys was investigated. We have stated that the nanocrystalline samples consist of the crystalline alfa-FeCo grains about 8 nm in diameter embedded in an amorphous matrix which is rich in cobalt. From Mössbauer spectroscopy studies we have found that the crystalline alfa-FeCo phase in the nanocrystalline samples obtained by the conventional annealing is atomically ordered. Moreover, the order degree depends on the annealing time. As for the samples partially crystallized during rapid quenching, the crystalline alfa-FeCo phase is atomically disordered.
Źródło:
Nukleonika; 2003, 48,suppl.1; 49-52
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Dissolved Oxygen on the Corrosion Behaviour in Ringers Solution and Artificial Saliva of Co-Mo Nano-Crystalline Coatings Electrodeposited on Co and 316L Substrates
Autorzy:
Vignal, V.
Krawiec, H.
Latkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/353806.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cobalt
molybdenum
nanocrystalline coating
corrosion
dissolved oxygen
Opis:
The influence on the corrosion behaviour of Co-Mo nano-crystalline coatings of dissolved oxygen is studied in the Ringer’s solution and artificial saliva at 25°C. This was done by means of potentiodynamic tests and surface observations. It was shown that dissolved oxygen has no influence on passivity, oxidation of the coating and selective dissolution of cobalt. By contrast, dissolved oxygen affects corrosion. General corrosion was observed in the Ringer’s solution whereas pitting corrosion was found in artificial saliva.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 39-43
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and properties of nanomaterials produced by severe plastic deformation
Autorzy:
Pakieła, Z.
Garbacz, H.
Lewandowska, M.
Drużycka-Wiencek, A.
Suś-Ryszkowska, M.
Zieliński, W.
Kurzydłowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/146207.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
nanocrystalline metals
severe plastic deformation
mechanical properties
Opis:
In recent years, a number of methods for refining the structure of metals by severe plastic deformation (SPD) have been developed. Some of those methods permit grain refinement to a nanometric level. These methods include, among others, high pressure torsion (HPT), equal channel angular pressing (ECAP) and hydrostatic extrusion (HE). The aim of this paper was a more detailed description of these methods and presentation of exemplary applications of these methods for structure refinement and improvement of mechanical properties of chosen materials. The results obtained in the present study show that the microstructures of the materials subjected to SPD studied in this work displayed considerable refinement, characterised by the formation of nanosized grains. Such a refinement resulted in increased tensile strength and hardness of the SPD materials studied in this work. In view of the results obtained on a large number of metals and alloys, a conclusion can be drawn that SPD could become an attractive way of processing materials for variety of applications.
Źródło:
Nukleonika; 2006, 51,suppl.1; 19-25
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication and Characterization of Porous Silicon
Autorzy:
Duaa, Jabbar Hussein
Alzubaidy, Muneer H. Jaduaa
Abd, Ahmed N.
Powiązania:
https://bibliotekanauki.pl/articles/1157178.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Anodization
Nanocrystalline porous silicon
XRD
porous silicon
Opis:
In this work, nanocrystalline porous silicon layers were fabricated by photoelectrochemical etching of n type silicon (n-Si) wafer. Different etching time (15, 20, 25 and 30) min and 10 mA/cm2 current density were tested to study their effect on the formation nanosized pore array. Porous silicon is investigation by X-Ray diffractions (XRD) and atomic force microscopy properties (AFM). Crystallites size was estimated by X-Ray diffraction. Atomic Force microscopy confirmed the nonmetric size Chemical Anodization the electrochemical etching was noticed of PS. The atomic force microscopy investigation showed the rough silicon surface which increased with etching time porous structure nucleates which leads to an increase in the depth and width (diameter) of surface pits.
Źródło:
World Scientific News; 2018, 94, 2; 321-328
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion Behavior of Amorphous-Nanocrystalline Ni50Ti50 Shape Memory Alloy
Autorzy:
Aghabeygzadeh, H.
Mohammad Sharifi, E.
Tavoosi, M.
Powiązania:
https://bibliotekanauki.pl/articles/2049440.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
NiTi
shape memory alloy
amorphous
nanocrystalline
corrosion
Opis:
In the present study, the corrosion behaviors of amorphous-nanocrystalline Ni50Ti50 shape memory alloy with different crystallite sizes were investigated. The Ni50Ti50 homogenized specimens were hot rolled and annealed at 950°C. Thereafter, the nanocrystalline Ni50Ti50 specimens with different crystalline sizes in the range of 40-350 nm were prepared by cold rolling and annealing at temperature range of 400 to 900°C. The corrosion resistance of Ni50Ti50 specimen with coarse grain size has significantly increased after cold rolling as a result of the formation of amorphous-nanocrystalline structure. The amorphous and nanocrystalline (with the crystallite size of about 40 nm) Ni50Ti50 samples exhibited the best corrosion resistance in the 5% HCl electrolyte with the corrosion potential and corrosion current density of about –197 mV and 2.34×10-6 A/cm2, respectively. This effect can be attributed to the higher density of crystalline defects in amorphous and nanocrystalline structures to quickly form protective films on the surface.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 1; 267-272
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and Corrosion Behaviour of Co-Mo/TiO2 Nano-Composite Coatings Formed on Disk and Wire Electrodes by Electrodeposition
Autorzy:
Krawiec, H.
Vignal, V.
Latkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/352460.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cobalt
molybdenum
nanocrystalline coating
corrosion
dissolved oxygen
Opis:
The influence of the electrode geometry on the microstructure and corrosion behaviour of Co-Mo nano-crystalline coatings elaborated by electrodeposition is studied. The corrosion behaviour was determined in the Ringer’s solution at 25°C. Electrodeposition mechanisms are also discussed as a function of the electrode geometry. The electrode geometry was found to affect the growth rate and, under certain conditions, the microstructure (existence of channels and pores). It does not have influence on the corrosion behaviour.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 23-28
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical properties of titanium processed by hydrostatic extrusion
Właściwosci mechaniczne tytanu wyciskanego hydrostatycznie
Autorzy:
Topolski, K.
Garbacz, H.
Wieciński, P.
Pachla, W.
Kurzydłowski, K. J.
Powiązania:
https://bibliotekanauki.pl/articles/356423.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
właściwości mechaniczne tytanu
tytan
wyciskanie hydrostatyczne
severe plastic deformation (SPD)
nanocrystalline titanium
hydrostatic extrusion (HE)
mechanical properties
nanocrystalline structure
Opis:
The mechanical properties of titanium Grade 2 subjected to the hydrostatic extrusion technique (HE) were investigated. The hydrostatic extrusion technique is a method which refines the titanium grains to a nano-metric size. Compared with coarse grained titanium (CG-Ti), nanocrystalline titanium (NC-Ti) is characterized by a much higher yield stress, tensile strength and microhardness. The yield stress of NC-Ti determined in tensile tests is higher than that measured in compression test. The Young modulus of NC-Ti is slightly lower than that of CG-Ti.
Przedmiot badań stanowiły właściwości mechaniczne tytanu Grade 2 poddanego wyciskaniu hydrostatycznemu. Technika wyciskania hydrostatycznego jest metodą, która umożliwia rozdrobnienie ziarna tytanu do wielkości nano-metrycznej. W porównaniu z tytanem gruboziarnistym (CG-Ti), tytan nanokrystaliczny (NC-Ti) charakteryzuje się o wiele wyższą granicą plastyczności, wytrzymałości na rozciąganie oraz mikrotwardością. Granica plastyczności NC-Ti wyznaczona podczas testów rozciągania jest wyższa niż granica plastyczności wyznaczona w testach ściskania. Natomiast moduł Young'a nanokrystalicznego tytanu jest nieznacznie mniejszy niż moduł tytanu gruboziarnistego.
Źródło:
Archives of Metallurgy and Materials; 2012, 57, 3; 863-867
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Response of ASC cells to pressure stimulation on oxygen terminated nanocrystalline diamond surface
Autorzy:
Stepanovska, J.
Matejka, R.
Potocky, S.
Vandrovcova, M.
Kromka, A.
Bacakova, L.
Powiązania:
https://bibliotekanauki.pl/articles/286107.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
ASC cells
bone replacement material
nanocrystalline diamond surface
Źródło:
Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 64
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Local atomic configuration in mechanically synthesized Co-Fe-Ni alloys
Autorzy:
Pikula, T.
Oleszak, D.
Żurawicz, J.
Jartych, E.
Powiązania:
https://bibliotekanauki.pl/articles/148207.pdf
Data publikacji:
2007
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
nanocrystalline alloys
mechanical alloying
hyperfine interactions
Mössbauer spectroscopy
Opis:
Ternary Co-Fe-Ni alloys were prepared from the elemental powders by the mechanical alloying method. Structural properties and hyperfine interactions parameters were determined using X-ray diffraction and Mössbauer spectroscopy. X-ray diffraction proved that during milling Co-Fe-based solid solutions with b.c.c. lattice were formed in the case of Co40Fe40Ni20 and Co50Fe40Ni10 alloys, while for Co52Fe26Ni22 and Co65Fe23Ni12 compositions Co-Ni-based solid solutions with f.c.c. lattice were obtained. Mössbauer spectroscopy revealed similar values of the average hyperfine magnetic fields for all the alloys. These values corresponded to the different surroundings of 57Fe isotopes by Co, Fe and Ni atoms, depending on the chemical composition of the alloy. The possible atomic configurations around 57Fe isotopes were discussed on the basis of the local environment model under the assumption that only the first nearest neighbours contribute to the hyperfine magnetic field at 57Fe site.
Źródło:
Nukleonika; 2007, 52, supl. 1; 47-50
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of Al doping on microstructure and hyperfine interactions in FINEMET
Autorzy:
Brzózka, K.
Szumiata, T.
Gawroński, M.
Górka, B.
Zorkovská, A.
Sovák, P.
Powiązania:
https://bibliotekanauki.pl/articles/147216.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
Mössbauer spectroscopy
FINEMET
nanocrystalline alloys
Al-dopped FINEMET
Opis:
Structure and hyperfine interactions of amorphous and nanocrystalline FINEMET were investigated by means of Mössbauer spectrometry. It was found that substitution of x iron atoms with aluminum ones causes changes in the properties of both amorphous and nanocrystalline alloys as well as in the structure of individual phases. The reduction of hyperfine magnetic field caused by atom substitution is a non-linear function of x, unlike the linear dependence expected because of dilution. Temperature studies reveal a double magnetic phase transition at 250°C and 330°C as well as point to the variety of phases in the examined material.
Źródło:
Nukleonika; 2004, 49,suppl.3; 59-62
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and Hardness of Cu-22Sn-xC Alloys Fabricated by Powder Metallurgy
Autorzy:
Kim, Gwanghun
Park, Jungbin
Lee, Seok-Jae
Kim, Hee-Soo
Powiązania:
https://bibliotekanauki.pl/articles/2203705.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cu-Sn alloy
nanocrystalline
carbon solubility
mechanical alloying
Opis:
Cu-Sn alloys have been known as bronze since ancient times and widely used as electrode materials, ornaments, tableware and musical instruments. Cu-22Sn alloy fabrication by hot forging process is a Korean traditional forged high-tin bronze. The tin content is 22 percent, which is more than twice that of bronze ware traditionally used in China and the West. Copper and tin have a carbon solubility of several ppm at room temperature, making Cu-Sn-C alloys difficult to manufacture by conventional casting methods. Research on the production of carbon-added copper alloys has used a manufacturing method that is different from the conventional casting method. In this study, Cu-22Sn-xC alloy was fabricated by mechanical alloying and spark plasma sintering. The carbon solubility was confirmed in Cu-Sn alloy through mechanical alloying. The lattice parameter increased from A0 to C2, and then decreased from C4. The microstructural characteristics of sintered alloys were determined using X-ray diffraction and microscopic analysis. As a result of comparing the hardness of Cu-22Sn alloys manufactured by conventional rolling, casting, and forging and Cu-22Sn-xC alloy by sintered powder metallugy, B0 sintered alloy was the highest at about 110.9 HRB.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 71--75
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physicochemical properties of pseudobrookite Fe2TiO5 synthesized from ilmenite ore by co-precipitation route
Autorzy:
Mahmoud, Mohamed H. H.
Hessien, Mahmoud M.
Alhadhrami, Abdulrahman
Gobouri, Adel A.
Powiązania:
https://bibliotekanauki.pl/articles/109822.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
ilmenite ore
pseudobrookite
Co-precipitation
nanocrystalline
magnetic properties
Opis:
Pseudobrookite (Fe2TiO5) is a semiconductor with numerous potential applications. Low-grade ilmenite ore has been used as an inexpensive source of Fe and Ti for preparation of Pseudobrookite. Ilmenite was first leached with 20% hydrochloric acid for 3 h at 70°C. Co-precipitation of soluble Fe and Ti from the rich filtrate was carried out at pH ≥ 9.1 followed by calcination at different temperatures (900-1300oC) for 2 h. X-ray diffraction patterns (XRD) showed that a single-phase nanocrystalline pseudobrookite powder was produced. The pH was a critical parameter for the evolution of formation the different sizes, structural morphology, and the magnetic properties of the product. Scanning electron microscope (SEM) images showed that particles synthesized at pH 11.2 contained more agglomerations and were more porous than those synthesized at pH 9.1. As the calcination temperature increases, the Fe2TiO5 changes from a small rod-like structure to an elongated rod-like structure, and finally to interconnected aggregated crystals. The magnetization of the synthesized Fe2TiO5 was measured using a vibrating sample magnetometer (VSM) and was found steadily increase with increasing calcination temperature from 1000 (≈9 emu/g) to 1300°C (16 emu/g). Such a large saturation of magnetization might be due to the high phase purity and well-defined crystallinity of Fe2TiO5.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 1; 290-300
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 68

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