Conclusions
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1.
A study was made of the conditions of preparation of highly dispersed copper-base composite powders by the process of reduction of basic copper carbonate with hydrogen in the presence of 0.1–16 vol.% of TiC, ZrC, NbC, Cr3C2, Mo2C, and WC carbides. It is shown that virtually complete reduction is achieved in 2 h at 170–200°C, the resulting powder particles being < 1μ in size.
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2.
It has been established that carbide additions have no effect on the rate of reduction of the carbonate, but merely increase the particle size of the powder. The inert behavior of carbides in the reduction process is ascribed to the absence of appreciable electronic exchange between the delocalized valency electrons of carbides and the atoms of copper undergoing reduction.
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In conclusion, the authors wish to express their gratitude to Academician G. V. Samsonov for discussion of the work and many valuable comments.
Translated from Poroshkovaya Metallurgiya, No. 3 (87), pp. 23–27, March, 1970.
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Motyazhev, V.I., Boiko, P.A., Vitryanyuk, V.K. et al. Preparation of fine composite copper powders containing carbides of the transition metals. Powder Metall Met Ceram 9, 194–197 (1970). https://doi.org/10.1007/BF00803948
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DOI: https://doi.org/10.1007/BF00803948