| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a silicon nitride powder with a highα-type content, sufficiently applicable to an industrial scale production and by which the reaction at a comparatively low temperature can be carried out without adding a reaction-accelerating catalyst, and the silicon nitride powder with the highα-type content, capable of providing a sintered body having excellent characteristics can stably and efficiently be produced by a simple process. SOLUTION: This method for producing silicon nitride powder by carrying out a nitriding treatment of a metal silicon powder in the atmosphere of nitrogen gas or a nonoxidative gas containing ammonia gas within the temperature region of 1,200-1,450 deg.C comprises using a metal silicon powder having <=1.3 wt.% total content of metallic impurities and <=0.3 wt.% Fe content as the metallic impurity, as a raw material.
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