Abstract
The mechanism and kinetics for the formation processes of powders of intermetallic compounds when the mixtures of oxides, metals, and calcium hydride are heated in the range t = 900–1200°C (the calcium hydride method) are investigated. It is established experimentally that the compounds are synthesized in two stages. At the first stage, metal oxides are reduced by the calcium melt (starting from ∼840°C); at the second stage, diffusion interactions of the components proceed. It is shown that, for the effective development of processes of alloy formation, metal components should be dissolved in liquid calcium or to form the eutectics between one another at a value of t not exceeding the working temperature of the process. As the latter increases, the reduction of oxides and diffusion interaction between the components are intensified and finished at t < 1200°C with the formation of homogeneous powders of intermetallic compounds. The possibility of forming a wide nomenclature of powders for intermetallic compounds of different applications is shown.
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Original Russian Text © A.V. Kasimtsev, V.V. Zhigunov, 2009, published in Izvestiya VUZ. Poroshkovaya Metallurgiya i Funktsional’nye Pokrytiya, 2009, No. 3, pp. 5–12.
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Kasimtsev, A.V., Zhigunov, V.V. Phase and structural transformations in production of powders of intermetallic compounds. Russ. J. Non-ferrous Metals 51, 150–157 (2010). https://doi.org/10.3103/S1067821210020148
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DOI: https://doi.org/10.3103/S1067821210020148