Method of making .alpha.-silicon nitride powder

Details Method of making .alpha.-silicon nitride powder Method of making .alpha.-silicon nitride powder

1979-09-26

1984-01-31

Cooper, Jack

Chemistry of inorganic compounds

Silicon or compound thereof

Binary compound

423406, C01B 21068

Patent

active

044289162

ABSTRACT:
.alpha.-Silicon nitride powder which is used as a raw material for the preparation of high strength silicon nitride with additives such as magnesia and yttrium oxide, and other sintered materials suitable for high temperatures gas turbine engine components and the like, is prepared by heating a powdered mixture of silica, carbon and at least one component selected from the group consisting of silicon nitride, silicon carbide and silicon oxynitride in a nitrogen containing atmosphere and then optionally subjecting the material to a heat treatment in an oxidizing atmosphere for decarbonization of said material as required.

REFERENCES:
patent: 3591337 (1971-07-01), Lumbey
patent: 3839341 (1974-10-01), Lumbey et al.
patent: 3855395 (1974-12-01), Cutler
patent: 3937792 (1976-02-01), Lumbey
Korneya et al., "J. Mat. Sci." 10, 1243-1246, 1975.

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