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Metallurgy and concentration

Effect of Temperature on Solid-state Hydride Metal Synthesis According to Thermodynamic Modeling

Authors:
A. A. Slobodov1
A. G. Syrkov2
L. A. Yachmenova3
A. N. Kushchenko4
N. R. Prokopchuk5
V. S. Kavun6
  • 1 — Saint-Petersburg State Institute of Technology
  • 2 — Saint-Petersburg Mining University
  • 3 — Saint-Petersburg Mining University
  • 4 — Saint-Petersburg Mining University
  • 5 — Belarusian State Technological University
  • 6 — LUT-University
Date submitted:
2019-06-05
Date published:
2019-10-27

Abstract

Thermodynamic modeling of the reduction of copper dichloride in the media of various gaseous hydrides (ammonia, monosilane, methane) in the temperature range 273-1000 K was carried out. Calculations show that in narrower temperature ranges corresponding to the reactions of solid-state hydride synthesis (SHS) of metal sub- stances metal formation is usually supported by theoretical propositions. As a result of thermodynamic modeling, a principal result was obtained on the suppression of   competing processes of nitriding, siliconizing and carbonization   of metal under SHS conditions, which is important for metallurgical production. This additionally substantiates the correctness of previous experimental studies of SHS metals with modified surface and improved properties. By mod- eling, it was found that the reduction of solid copper dichloride to metal in ammonia or methane occurs stepwise (se- quentially, according to the Baykov rule) through the intermediate stages of the formation of a compound of low- valent copper – copper (I) chloride.

10.31897/pmi.2019.5.550
Go to volume 239

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