| 摘要 |
A blank is molded from a powdery mixture of silicon, alpha -silicon nitride, and a sintering agent. The blank is nitrided to nitride the silicon content of the blank, and thereafter the blank is subjected to hot isostatic pressing. The silicon content of the original powdery mixture is between 5% and 60% by weight of the mixture, and the sintering agent, which may be an oxide, is present in the original powdery mixture in the range between 0.1% and 10% by weight. The nitriding is carried out in a nitrogen atmosphere at a temperature between 1100 DEG C. and 1600 DEG C. The nitriding may be carried out in two stages, first at a temperature between 1050 DEG C. and 1400 DEG C., and then at a temperature above the melting point of silicon.
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