FIELD: chemistry.
SUBSTANCE: method for producing silicon nitride alpha-phase involves preparing a mixture of silicone powder and silicon nitride, placing the mixture into a closed loop, filling a reactor with nitrogen, inflaming the mixture locally, performing synthesis in the combustion mode under nitrogen pressure followed by residual pressure release, cooling down and recovering the end product. The silicon and silicon nitride ratio in the mixture makes (1:4)-(1:1). The mixture is additionally added with one or more additives from: NH4Cl, NH4F, (NH4)2SiF6, Na2SiF6, K2SiF6 and/or group I, II, III metal halogenides.
EFFECT: developing the industrial method for producing high-purity high-alpha phase silicon nitride powder.
3 cl, 1 tbl, 7 ex
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