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    • 6. 发明授权
    • Method of manufacturing a sintered composite body of silicon nitride and
silicon carbide
    • 制造氮化硅和碳化硅烧结复合体的方法
    • US5648028A
    • 1997-07-15
    • US413445
    • 1995-03-30
    • Kazumi MiyakeKagehisa HamazakiHitoshi ToyodaYoshikatsu Higuchi
    • Kazumi MiyakeKagehisa HamazakiHitoshi ToyodaYoshikatsu Higuchi
    • C01B21/068C04B35/573C04B35/575C04B35/591C04B35/593B28B3/00C04B33/32
    • C01B21/0682C01B21/068C04B35/573C04B35/575C04B35/591C04B35/593C01P2004/03C01P2004/61C01P2004/62C01P2006/10C01P2006/12
    • A sintered composite body of silicon nitride and silicon carbide is manufactured by mixing a silicon powder with a carbonaceous powder and a sintering additive, producing a mixture, molding the mixture into a molded body, heat-treating the molded body in an atmosphere containing a nitrogen gas for thereby simultaneously nitriding and carbonizing silicon contained in the molded body, and subsequently firing the molded body in a nitrogen gas atmosphere. A composite powder of silicon nitride and silicon carbide which is produced by simultaneously nitriding and carbonizing silicon contained in the molded body has a content of .alpha.-type silicon nitride which is at least 30% of all silicon nitride in the composite powder. To produce such a composite powder, a silicon powder is mixed with a carbonaceous powder and a sintering additive, producing a mixture, and the mixture is heat-treated in an atmosphere containing a nitrogen gas at a temperature of at most 1450.degree. C. for thereby simultaneously nitriding and carbonizing silicon contained in the mixture, the arrangement being such that the temperature of the mixture is increased at a rate lower than 2.degree. C./minute from a temperature before the silicon starts being nitrided and carbonized up to the temperature of at most 1450.degree. C.
    • 通过将硅粉与碳质粉末和烧结添加剂混合制造氮化硅和碳化硅的烧结复合体,制造混合物,将混合物成型为成型体,在含有氮气的气氛中对成型体进行热处理 气体,从而同时对包含在成型体中的硅进行氮化和碳化,随后在氮气气氛中焙烧成型体。 通过同时对包含在成型体中的硅进行氮化和碳化而制造的氮化硅和碳化硅的复合粉末具有在复合粉末中为所有氮化硅的至少30%的α型氮化硅的含量。 为了制造这种复合粉末,将硅粉末与碳质粉末和烧结添加剂混合,制成混合物,将混合物在含有氮气的气氛中在至多1450℃的温度下进行热处理, 从而同时氮化和碳化混合物中所含的硅,该配置使得混合物的温度以低于2℃/分钟的速率从硅开始氮化和碳化之前的温度升高到 至多1450℃