Kinetics and Mechanism of Calcium Hydride Synthesis of the Intermetallic Compound Cr2Ta

A. M. Guryanov; Гурьянов А. М.; S. N. Yudin; Юдин С. Н.; A. V. Kasimtsev; Касимцев А. В.; S. S. Volodko; Володько С. С.; I. A. Alimov; Алимов И. А.; E. V. Evstratov; Евстратов Е. В.

doi:10.31857/S0002337X23050056

Kinetics and Mechanism of Calcium Hydride Synthesis of the Intermetallic Compound Cr2Ta

Authors: Guryanov A.M.¹^,2, Yudin S.N.¹^,2, Kasimtsev A.V.¹^,2, Volodko S.S.¹^,2, Alimov I.A.¹^,2, Evstratov E.V.³
Affiliations:
1. Tula State University
2. LCC Metsintez
3. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences
Issue: Vol 59, No 5 (2023)
Pages: 481-493
Section: Articles
URL: https://medjrf.com/0002-337X/article/view/668246
DOI: https://doi.org/10.31857/S0002337X23050056
EDN: https://elibrary.ru/ZETAXB
ID: 668246

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Abstract

This paper presents results on the kinetics of the synthesis of the Cr2Ta intermetallic compound via calcium hydride reduction and the influence of various technological parameters on this process. We have observed anomalous Cr2Ta formation kinetics, in particular, an explosive increase in the amount of this phase as a certain synthesis temperature is reached. The apparent activation energy for the calcium hydride synthesis of the Cr2Ta intermetallic compound has been determined to be ~291 kJ/mol, approaching the activation energy for heterodiffusion in various Laves phases (Cr2Ti, Cr2Nb, Co2Nb, and Fe2Ti). The results obtained in this study are used to gain insight into the mechanism of the calcium hydride synthesis of Cr2Ta. Calcium hydride reduction has been shown to be potentially attractive for the preparation of refractory intermetallics. Further work in this direction will make it possible to obtain high-quality powder and compact articles from it.

Keywords

synthesis, calcium hydride reduction, Cr2Ta, diffusion, mechanism, properties

References

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