Method for producing powder of .alpha.-silicon nitride

Details Method for producing powder of .alpha.-silicon nitride Method for producing powder of .alpha.-silicon nitride

C - Chemistry, Metallurgy

01

B

23/195

C01B 21/06 (2006.01) C01B 21/068 (2006.01) C04B 35/584 (2006.01)

Patent

CA 1145919

- 15 - Abstract of the Disclosure A method for producing powder of .alpha.-silicon nitride which comprises the steps of: adding 0.3 to 2 parts by weight of powder of carbon and 0.005 to 1 part by weight of at least one silicon compound selected from the group consisting of Si3N4, SiC and silicon oxide nitride series compounds to one part by weight (as converted to SiO2) of a liquid silane derivative which produces a precipitate and HCl by hydrolysis and further causes SiO2 to be grown by the baking of said precipitate, or the precipitate produced by hydrolysis of the liquid silane derivatives; hydrolyzing the resultant mixture, if necessary; washing the mixture to separate a solid component, if necessary; and baking the solid component for reduction and nitro- genization at a temperature of 1300° to 1500°C in an atmosphere mainly consisting of a nitrogen gas or a gas of a nitrogen compound.

345840

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