公开(公告)号：US5591687A

公开(公告)日：1997-01-07

申请号：US384981

申请日：1995-02-07

申请人： Hideki Kita ,  Wenjea J. Tseng ,  Toshiyuki Yamada

发明人： Hideki Kita ,  Wenjea J. Tseng ,  Toshiyuki Yamada

IPC分类号： C04B35/584 ,  C04B35/591

CPC分类号： C04B35/584 ,  C04B35/591

摘要： A silicon nitride based sintered product produced with Si powder, a Si.sub.3 N.sub.4 powder, and an assistant component effective for sintering silicon nitride as raw materials. A resultant sintered product has fine tissue, exhibits little presence of pores and remaining silicon, and possesses high mechanical strength which can be enhanced by calcinating the product under low pressure after it has been reacted and first sintered.

摘要翻译： 一种由Si粉末制成的氮化硅基烧结产品，Si3N4粉末，和用于烧结氮化硅作为原料的助剂。 得到的烧结产品具有精细的组织，几乎不存在孔隙和剩余的硅，并且具有高的机械强度，这可以通过在反应和第一次烧结之后在低压下煅烧产品而增强。

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。