Process for the production of silicon nitride and product made according to the process
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United States of America Patent
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May 19, 1992
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app pub date -
May 9, 1991
filing date -
Dec 8, 1988
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Abstract
The present invention provides a process for the production of silicon nitride by the reaction of silicon and nitrogen, wherein, in one reaction step, silicon powder is reacted with nitrogen which continuously rotates at a temperature of from 1000.degree. to 1800.degree. C. and at a pressure of from 1.01 to 1.8 bar up to a nitrogen content of 1 to 39.5% by weight. The present invention also provides a silicon nitride produced by this process wherein it is obtained in porous form and has the following properties. a) grain size of 0.1 to 20 mm. b) nitrogen content of 1 to 39.5% by weight, c) oxygen content of 1%, d) ratio of .alpha.:.beta.-phase of 1:9 to 9:1.
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