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2. 发明授权

US5616527A Composite ceramic 失效
标题翻译：复合陶瓷
公开(公告)号：US5616527A
公开(公告)日：1997-04-01
申请号：US593282
申请日：1996-01-30
申请人： Hideki Kita , Wenjea J. Tseng
发明人： Hideki Kita , Wenjea J. Tseng
IPC分类号： C04B35/597 , C04B35/65 , C04B35/80 , C04B38/00 , C04B35/596
CPC分类号： C04B35/597 , C04B35/65 , C04B35/803 , C04B38/00
摘要： A composite ceramic is produced by forming a mixed powder of Si and a compound oxide as the starting material into a formed material, nitriding and firing the formed material to form a sinter, and subjecting the sinter to oxidation treatment. The composite ceramic, which is:lightweight and reduced in heat conductivity, has a specific gravity of at most 2.6, and comprises a phase composed of all of elements Si, O and N, and at least one element selected from the element group consisting of A1, Zr, Li, P and Mg, in which phase a subphase composed of Si, Al, 0 and N and a subphase composed of Si, O and N are formed. Another composite ceramic has pores and a disperse phase in a matrix phase composed of Si.sub.3 N.sub.4 crystal grains, an oxide and an oxynitride, and further comprises coarse Si.sub.3 N.sub.4 grains dispersed in the matrix phase with O-containing boundary reaction product layers formed in the boundaries between the matrix phase and the coarse Si.sub.3 N.sub.4 grains. Thus, this composite ceramic, though reduced in heat conductivity, has a high toughness and a high strength due to dispersion of the coarse Si.sub.3 N.sub.4 grains in the matrix phase.
摘要翻译：通过将Si和复合氧化物的混合粉末作为原料形成成形材料，氮化和烧制所形成的材料以形成烧结体，并对烧结体进行氧化处理来制造复合陶瓷。复合陶瓷：重量轻且导热性降低，其比重至多为2.6，并且包括由所有元素Si，O和N组成的相，以及选自元素组中的至少一种元素 Al，Zr，Li，P和Mg，其中形成由Si，Al，O和N组成的亚相和由Si，O和N组成的亚相的相。另一种复合陶瓷在由Si 3 N 4晶粒，氧化物和氮氧化物组成的基体相中具有孔和分散相，并且还包含分散在基质相中的粗大的Si 3 N 4晶粒，其中所述的含有O的边界反应产物层形成在基体相和粗Si3N4晶粒。因此，该复合陶瓷虽然导热率降低，但是由于基体相中的粗大的Si 3 N 4晶粒的分散，所以具有高的韧性和高的强度。

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