发明授权
- 专利标题： Si.sub.3 N.sub.4 Ceramic powder material and method for manufacturing the same
- 专利标题（中）： Si3N4陶瓷粉末材料及其制造方法
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申请号： US221813申请日： 1980-12-31
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公开(公告)号： US4341874A公开(公告)日： 1982-07-27
- 发明人: Katsutoshi Nishida , Michiyasu Komatsu , Tadashi Miyano
- 申请人： Katsutoshi Nishida , Michiyasu Komatsu , Tadashi Miyano
- 申请人地址： JPX Kawasaki
- 专利权人： Tokyo Shibaura Electric Co., Ltd.
- 当前专利权人： Tokyo Shibaura Electric Co., Ltd.
- 当前专利权人地址： JPX Kawasaki
- 主分类号： C04B35/584
- IPC分类号： C04B35/584 ; C04B35/593 ; C04B35/58
摘要：
Ceramic powder material mainly consists of silicon nitride wherein the content of oxygen combined with generally unavoidable impurities as measured by activation analysis accounts for less than 2% by weight. The above-mentioned ceramic powder material can also be prepared preferably by the method which comprises the step of heating raw ceramic powder material mainly consisting of silicon nitride to 1,400.degree. C. to 1,900.degree. C. in the presence of a separately prepared nonsintered molding of ceramic material or sintered molding of ceramic material having a porosity of at least 10%.