发明授权
- 专利标题： Silicon nitride powders with improved surface properties and processes for their preparation
- 专利标题（中）： 具有改善表面性能的氮化硅粉末及其制备方法
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申请号： US579237申请日： 1990-09-04
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公开(公告)号： US5030434A公开(公告)日： 1991-07-09
- 发明人: Ulrike Pitzer , Gerhard Franz , Benno Laubach
- 申请人： Ulrike Pitzer , Gerhard Franz , Benno Laubach
- 申请人地址： DEX Leverkusen
- 专利权人： Bayer Aktiengesellschaft
- 当前专利权人： Bayer Aktiengesellschaft
- 当前专利权人地址： DEX Leverkusen
- 优先权： DEX3829504 19880831
- 主分类号： C01B21/068
- IPC分类号： C01B21/068
摘要：
Si.sub.3 N.sub.4 powders having a total oxygen content of less than 1.8% by weight with the proportion of surface oxygen content of more than 65% of the total oxygen content, and having a fluorine content of less than 35 ppm are prepared by annealing Si.sub.3 N.sub.4 powders having a total oxygen content of less than or equal to 0.4% by weight in an oxygen-containing atmosphere at temperatures of 700.degree. C. to 1200.degree. C. for 15 to 90 minutes or by grinding Si.sub.3 N.sub.4 powders having a total oxygen content of less than or equal to 0.4% by weight in water, alcohol or aqueous alcohol 15 to 120 minutes.
公开/授权文献
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