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Powder Metallurgy and Additive Technologies
Название Self-propagating high-temperature synthesis (SHS) of composite ferroalloys
DOI 10.17580/cisisr.2019.02.11
Автор I. M. Shatokhin, M. Kh. Ziatdinov, I. R. Manashev, O. P. Shiryaev, A. D. Kartunov
Информация об авторе

NTPF “Etalon” (Magnitogorsk, Russia):

Shatokhin I. M., General Director

Tomsk State University (Tomsk, Russia):
Ziatdinov M. Kh., Dr. Eng., Leading Researcher


Nosov Magnitogorsk State Technical University (Magnitogorsk, Russia):
Manashev I. R., Cand. Eng.
Kartunov A. D., Head of Technical Dept.


Magnitogorsk Iron and Steel Works (Magnitogorsk, Russia):

Shiryaev O. P., Deputy General Director on Production


E-mail: mirney@yandex.ru


Gavrilova T. O., Deputy general director of NPTF “Etalon”, participated in this research.


The results of studies on the production of a new class of alloying materials in the combustion mode are presented on the example of synthesis of composite alloys based on vanadium, chromium and silicon nitrides. Principal possibility of creation of the SHS production of various composite ferroalloys for steelmaking was proved when using conventional ferroalloys as a raw material. It is shown that the degree of nitriding of ferroalloys in the conditions of filtration combustion strongly depends on the pressure of nitrogen, initial material powder dispersity and porosity of the nitride samples. The higher is the nitrogen pressure, the greater is the porosity of the samples and the larger are particles of the original ferroalloy powder, and the greater is the amount of nitrogen fixed in the combustion products. More dense samples and samples of the larger ferroalloy powder are nitrided in a more narrow range of nitrogen pressure. To initiate a stable layer-by-layer combustion it is required to provide higher pressure in such samples. It is shown that nitriding of initial ferroalloy can occur either by solid-phase (ferrochromium) or by liquid-phase (ferrosilicium, ferrovanadium) mechanisms, depending on the composition of initial ferroalloy. In the first case, the combustion temperature is below the melting point of the initial alloy and eutectic in the system Cr–Fe–N. In the second case it is higher. When solid-phase nitriding takes place, ferroalloy saturation with nitrogen always occurs step-by-step — at layer-by-layer combustion and volumetric additional burning. When liquid-phase nitriding takes place, nitrogen absorption can occur in one or in two stages depending on the amount of liquid phase in the combustion wave. When forming large amount of combustion products (e.g. ferrovanadium) after melting, additional nitriding is absent. When fraction of liquid combustion products (e.g ferrosilicium) is lower, contribution of additional nitriding is significant.

Ключевые слова Self-propagating high-temperature synthesis, nitriding ferroalloys, ferrovanadium nitride, ferrochromium nitride, ferrosilicium nitride, filtration combustion, microalloying
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Полный текст статьи Self-propagating high-temperature synthesis (SHS) of composite ferroalloys