Conclusions
The formation of Si3N4, during the carbothermic reduction of SiO2 in the presence of small Fe additions combined with nitridation is a complex process involving several solid-solid, gas-solid, gas-liquid-solid, and gas-gas reaction stages. The catalytic action of iron manifests itself in the formation of an intermediate compound — iron carbosilicide. The product of the nitridation of FeSixCy isα-Si3N4, and that of the nitridation of silicon, β-Si3N4.
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Translated from Poroshkovaya Metallurgiya, No. 7(247), pp. 13–17, July, 1983.
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Bartnitskaya, T.S., Pikuza, P.P., Timofeeva, I.I. et al. Formation of silicon nitride from silica. Powder Metall Met Ceram 22, 523–527 (1983). https://doi.org/10.1007/BF00805645
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DOI: https://doi.org/10.1007/BF00805645