Method of making .alpha.-silicon nitride powder
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United States of America Patent
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Jan 31, 1984
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N/A
app pub date -
Sep 26, 1979
filing date -
Feb 18, 1977
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Expired
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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.
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