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    Wyświetlanie 1-11 z 11
    Tytuł:
    Combined Effect of Zr and Si on Isothermal Oxidation of Ti
    Autorzy:
    Ha, S.-H.
    Kim, B.-H.
    Yoon, Y.-O.
    Lim, H.-K.
    Kim, S. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/353260.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ti
    Zr
    Si
    silicide
    oxidation
    Opis:
    In this study, the combined effect of Zr and Si on isothermal oxidation of Ti for 25 and 50h at 820°C, which is the temperature related to exhaust valves operation, was investigated. Si addition into Ti-5mass%Zr alloy led to a distribution of silicide Ti5Si3 phase formed by a eutectic reaction. The Ti sample containing only Zr showed more retarded oxidation rate than Ti-6Al-4V, the most prevalent Ti alloy, at the same condition. However, while a simultaneous addition of Zr and Si resulted in greater increase of oxidation resistance. The oxide layer formed after the addition of Zr and Si comprised TiO2, ZrO2, and SiO2.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 3; 1493-1495
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pseudometeorite from Łapino (Pomerania, North Poland)
    Autorzy:
    Stępniewski, M.
    Borucki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059303.pdf
    Data publikacji:
    2001
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Łapino
    morth Poland
    iron silicide
    pseudometeorite
    Opis:
    A boulder, found in a gravel pit by Łapino near Gdańsk in 1954, was noted as unusual. Among various erratics ice-derived from Scandinavia in the Quaternary, this one had an extraordinary appearance; unusually dark, heavy and strongly magnetic. An extraterrestrial origin was suggested. The border resembles an intrusive breccia with numerous periclase-bearing fragments in a magnetite-clinopyroxene-olivine matrix. A single grain with a metallic luster, a few centimetres in diameter, was identified as the iron silicide (Fe3Si). Only two natural occurrences of iron silicide have been described, both from meteorites. However, the isotopic analysis showed an absence of radiogenic nuclides (10Be, 26Al, 36Cl), and the ratio of oxygen isotopes (delta 17O and delta 18O) suggested a terrestrial origin. Thus the stone is probable artifact, presumably the product of an unidentified foundry.
    Źródło:
    Geological Quarterly; 2001, 45, 3; 343-348
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies on magnetron-sputtered zirconium-silicide coatings deposited on zirconium alloy for the enhancement of their high-temperature oxidation resistance
    Autorzy:
    Starosta, Wojciech
    Semina, Viera K.
    Smolik, Jerzy
    Waliś, Lech
    Rydzewski, Michał
    Sartowska, Bożena
    Powiązania:
    https://bibliotekanauki.pl/articles/146247.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    accident tolerant fuels
    zirconium-silicide coatings
    magnetron sputtering
    Opis:
    Zirconium alloys used widely in nuclear industry as fuel claddings are prone to violent oxidation in water steam atmosphere in the case of loss of coolant accident (LOCA). Accompanying generation of large quantities of heat and explosive gaseous hydrogen may lead to destruction of nuclear core. As the safety of nuclear installations is of primary importance, intensive research works are conducted on the development of so-called accident tolerant fuels much less prone to oxidation. In this paper, the application of external zirconium-silicide coatings deposited by magnetron sputtering is proposed. The preliminary results of their synthesis and studies of air oxidation properties at elevated temperatures are presented.
    Źródło:
    Nukleonika; 2020, 65, 3; 73-79
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Self-Consolidation Mechanism of Ti5Si3 Compact Obtained by Electro-Discharge-Sintering Directly from Physically Blended Ti-37.5 At.% Si Powder Mixture
    Autorzy:
    Chang, S. Y.
    Cheon, Y. W.
    Yoon, Y. H.
    Kim, Y. H.
    Kim, J. Y.
    Lee, Y. K.
    Lee, W. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/353022.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sintering
    mechanical alloying
    powder consolidation
    intermetallic compounds
    titanium silicide
    Opis:
    Characteristics of electro-discharge-sintering of the Ti-37.5at.% Si powder mixture was investigated as a function of the input energy, capacitance, and discharge time without applying any external pressure. A solid bulk of Ti5Si3 was obtained only after in less than 129 μsec by the EDS process. During a discharge, the heat is generated to liquefy and alloy the particles, and which enhances the pinch pressure can condensate them without allowing a formation of pores. Three step processes for the self-consolidation mechanism during EDS are proposed; (a) a physical breakdown of oxide film on elemental as-received powder particles, (b) alloying and densifying the consolidation of powder particles by the pinch pressure, and (c) diffusion of impurities into the consolidated surface.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2B; 1299-1302
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Silicon Carbide Fabrication by Infiltration of Molten Fe-Si Alloy Through Two-Step Reaction Sintering
    Autorzy:
    Hanada, Yoshitsugu
    Xiao, Yang
    Sonoda, Akio
    Kang, Hyo-Gyoung
    Nagayoshi, Hideaki
    Yamamoto, Atsuo
    Tokunaga, Tatsuya
    Powiązania:
    https://bibliotekanauki.pl/articles/355100.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electrical resistivity
    fracture toughness
    iron silicide
    molten metal infiltration
    silicon carbide
    Opis:
    Wider application of silicon carbide (SiC) is anticipated for increasing the durability of various structural facilities. For this study, SiC was fabricated with decreased electrical resistivity for precision electrical discharge machining. Two-step reaction sintering by infiltration of molten Fe-Si alloy was applied for SiC fabrication. The procedure included first sintering at 973 K in Ar gas atmosphere and second sintering by spontaneous infiltration of molten Fe-75%Si alloy at 1693 K in vacuum. The sintered structure porosity became very low, forming 3C-type SiC. Results confirmed that molten Fe-75%Si alloy infiltration occurred because of reaction sintering. The electrical resistivity of the sintered SiC infiltrated by molten Fe-75%Si alloy can be improved to be two orders of magnitude lower than that by molten Si, consequently maintaining the high performance of SiC.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 4; 1645-1652
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Silicide spherules from Permian sediments of the Fore-Sudetic Monocline (SW Poland)
    Autorzy:
    Muszer, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/110639.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Permian
    Fe-silicide spherules
    cosmic dust
    ore minerals
    Fe-Si alloy
    Opis:
    The presence of Fe-silicides, extremely rare mineral phases were documented in the Permian Cu-bearing ore formation in the Fore-Sudetic Monocline (Polkowice-Sieroszowice and Rudna mines, SW Poland). It is a first report of their occurrence within rocks of Late Palaeozoic age. The Fe-Si alloys forme spherules of various structure and chemical composition. The silicide spherules were found in the flotation concentrates prepared from the copper ore. Their composition varies from FeSi (fersilicite) to Fe2Si3 or Fe4Si9. A dominant constituent is Fe5Si3 (xifengite) with admixtures of P, Ti, Cr and Mn. Native Si and Ti were detected in the marginal part of spherules. The current knowledge do not permit to determine unequivocally whether the Fe-silicide spherules formed as a result of Permian cosmic dust or constitute terrestrial magmatic material of ultramafic character transported into a sedimentary basin from the adjacent terrain.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2014, 50, 1; 107-118
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Challenges in scaling of CMOS devices towards 65 nm node
    Autorzy:
    Jurczak, M.
    Veloso, A.
    Rooyackers, R.
    Augendre, E.
    Mertens, S.
    Rotschild, A.
    Scaekers, M.
    Lindsay, R.
    Lauwers, A.
    Henson, K.
    Severi, S.
    Pollentier, I.
    Keersgieter de, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/308984.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    CMOS devices
    gate dielectrics
    shallow junctions
    silicide
    gate stack
    lithography
    gate patterning
    silicon recess
    device integration
    Opis:
    The current trend in scaling transistor gate length below 60 nm is posing great challenges both related to process technology and circuit/system design. From the process technology point of view it is becoming increasingly difficult to continue scaling in traditional way due to fundamental limitations like resolution, quantum effects or random fluctuations. In turn, this has an important impact on electrical device specifications especially leakage current and the circuit power dissipation.
    Źródło:
    Journal of Telecommunications and Information Technology; 2005, 1; 3-6
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ warunków krzemowania metodą kontaktowo-gazową na mikrostrukturę warstw na podłożu tytanu
    The influence of pack siliconizing conditions on the structure of coatings produced on titanium
    Autorzy:
    Góral, Marek
    Kubaszek, Tadeusz
    Gajewski, Konrad
    Powiązania:
    https://bibliotekanauki.pl/articles/195201.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    krzemowanie
    stopy tytanu
    warstwy żaroodporne
    krzemki tytanu
    silicide coatings
    pack siliconizing
    titanium alloys
    heat resistant coatings
    titanium silicides
    Opis:
    W artykule przedstawiono wyniki badań nad wytwarzaniem warstw krzemkowych na podłożu tytanu Grade 2 metodą kontaktowo-gazową. Stosowano dwa rodzaje proszków o różnej zawartości Si (ok. 10 i 48% mas.) oraz fluorek magnezu i aluminium jako aktywatory. Stwierdzono, że zastosowanie proszku o mniejszej zawartości krzemu skutkuje powstaniem warstw o głębokości nieprzekraczającej 5 mm. Zastosowanie proszku o dużej zawartości Si i AlF3 jako aktywatora skutkuje powstaniem wielostrefowej warstwy o głębokości ok. 15 mm, złożonej z faz TiSi, Ti5Si4, Ti5Si3 i TiSi2.
    In the article the results of experimental pack siliconizing of titanium grade 2 alloys were presented. The powders containing low (10 wt. %) and high (48 wt. %) silicon content were used. The aluminium and magnesium fluorides were used as activators. The thickness of silicide coatings produced using the low-Si content powder did not exceed 5 mm. The use of high Si content pack nenabled to form thick (15 mm) multilayer coating formed from TiSi, Ti5Si4, Ti5Si3 and TiSi2 silicides.
    Źródło:
    Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika; 2019, z. 91 [299], 1-2; 17-26
    0209-2689
    2300-5211
    Pojawia się w:
    Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High temperature resistance of silicide-coated niobium
    Autorzy:
    Szklarek, Radosław
    Tański, Tomasz
    Mendala, Bogusław
    Staszuk, Marcin
    Krzemiński, Łukasz
    Nuckowski, Paweł
    Sobczak, Kamil
    Powiązania:
    https://bibliotekanauki.pl/articles/2086896.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    niobium
    silicide
    thermal barrier coating
    CVD
    high-temperature oxidation resistance
    niob
    krzemek
    powłoka termoizolacyjna
    odporność na utlenianie w wysokiej temperaturze
    Opis:
    In this paper, thermal oxidation resistance of silicide-coated niobium substrates was tested in a temperature range of 1300–1450°C using an HVOF burner. Pure niobium specimens were coated using the pack cementation CVD method. Three different silicide thickness coatings were deposited. Thermal oxidation resistance of the coated niobium substrates was tested in a temperature range of 1300–1450°C using an HVOF burner. All samples that passed the test showed their ability to stabilize the temperature over a time of 30 s during the thermal test. The rise time of substrate temperature takes about 10 s, following which it keeps constant values. In order to assess the quality of the Nb-Si coatings before and after the thermal test, light microscopy, scanning electron microscopy (SEM) along with chemical analysis (EDS), X-ray diffraction XRD and Vickers hardness test investigation were performed. Results confirmed the presence of substrate Nb compounds as well as Si addition. The oxygen compounds are a result of high temperature intense oxidizing environment that causes the generation of SiO phase in the form of quartz and cristobalite during thermal testing. Except for one specimen, all substrate surfaces pass the high temperature oxidation test with no damages.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 5; e137416, 1--8
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructural analysis of AM50/Mg2Si cast magnesium composites
    Autorzy:
    Malik, M. A.
    Majchrzak, K.
    Braszczyńska-Malik, K. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/380454.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    stop magnezu AM50
    Mg2Si
    krzemek magnezu
    kompozyt metalowy
    AM50 magnesium alloy
    magnesium silicide
    metal matrix composites
    Opis:
    AM50/Mg2Si composites containing 5.7 wt. % and 9.9 wt. %. of Mg2Si reinforcing phase were prepared successfully by casting method. The microstructure of the cast AM50/Mg2Si magnesium matrix composites was investigated by light microscopy and X-ray diffractometry (XRD). The microstructure of these composites was characterized by the presence of \alfa-phase (a solid solution of aluminium in magnesium), Mg17Al12 (\gamma-phase), Al8Mn5 and Mg2Si. It was demonstrated that the Mg2Si phase was formed mainly as primary dendrites and eutectic.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 4; 109-112
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermoelectric properties of bismuth-doped magnesium silicide obtained by the self-propagating high-temperature synthesis
    Autorzy:
    Bucholc, Bartosz
    Kaszyca, Kamil
    Śpiewak, Piotr
    Mars, Krzysztof
    Kruszewski, Mirosław J.
    Ciupiński, Łukasz
    Kowiorski, Krystian
    Zybała, Rafał
    Powiązania:
    https://bibliotekanauki.pl/articles/2173670.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermoelectric materials
    magnesium silicide
    bismuth doping
    SHS
    self-propagating high-temperature synthesis
    spark plasma sintering
    materiały termoelektryczne
    krzemek magnezu
    doping bizmutem
    samorozwijająca się wysokotemperaturowa synteza
    iskrowe spiekanie plazmowe
    Opis:
    Doping is one of the possible ways to significantly increase the thermoelectric properties of many different materials. It has been confirmed that by introducing bismuth atoms into Mg sites in the Mg2Si compound, it is possible to increase career concentration and intensify the effect of phonon scattering, which results in remarkable enhancement in the figure of merit (ZT) value. Magnesium silicide has gained scientists’ attention due to its nontoxicity, low density, and inexpensiveness. This paper reports on our latest attempt to employ ultrafast self-propagating high-temperature synthesis (SHS) followed by the spark plasma sintering (SPS) as a synthesis process of doped Mg2Si. Materials with varied bismuth doping were fabricated and then thoroughly analyzed with the laser flash method (LFA), X-ray diffraction (XRD), scanning electron microscopy (SEM) with an integrated energy-dispersive spectrometer (EDS). For density measurement, the Archimedes method was used. The electrical conductivity was measured using a standard four-probe method. The Seebeck coefficient was calculated from measured Seebeck voltage in the sample subjected to a temperature gradient. The structural analyses showed the Mg2Si phase as dominant and Bi2Mg3 located at grain boundaries. Bismuth doping enhanced ZT for every dopant concentration. ZT = 0.44 and ZT=0.38 were obtained for 3wt% and 2wt% at 770 K, respectively.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 3; art. no. e141007
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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