Abstract
Work devoted to studying the phase composition and thickness of chromium, titanium, molybdenum, vanadium, and tungsten coatings which form on diamond powder during vacuum annealing of this powder mixed with chromium powder or oxidized powders of Ti, Mo, V, and W is analyzed. Coatings consist of metal (Cr, Ti, Mo, V, W) and carbide (Cr7C3, Cr3C2, TiC, α-Mo2C, V2C, VC, W2C, WC) phases. Diffusion of carbon during coating growth with increased metallizing time and temperature causes carbidization of chromium, titanium, and vanadium (it causes a reduction in the content of metal phase and an increase in carbide phases is coatings), growth of higher carbides (Cr3C2, VC, WC) at the expense of lower carbides (Cr7C3, V2C, W2C), and filling of carbon vacancies in the lattices of TiC and VC. Saturation of coatings with carbides correlates with the temperature-time range in which a further increase in coating weight slows down.
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Translated from Poroshkovaya Metallurgiya, No. 7(355), pp. 34–40, July, 1992.
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Chuprina, V.G. Physicochemical interaction and structure development during the formation of metal gas-transfer coatings on diamond (review). 1. Kinetics. Powder Metall Met Ceram 31, 578–583 (1992). https://doi.org/10.1007/BF00793435
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DOI: https://doi.org/10.1007/BF00793435