公开(公告)号：US5188908A

公开(公告)日：1993-02-23

申请号：US658914

申请日：1991-02-22

申请人： Akio Nishiyama ,  Takashi Koyama ,  Yasutaka Aikawa ,  Hideo Ohshima ,  Yuichiro Terao ,  Munenori Kato ,  Akio Sakai

发明人： Akio Nishiyama ,  Takashi Koyama ,  Yasutaka Aikawa ,  Hideo Ohshima ,  Yuichiro Terao ,  Munenori Kato ,  Akio Sakai

IPC分类号： B23B27/14 ,  C04B35/111 ,  C04B35/117 ,  C04B35/119

CPC分类号： C04B35/111 ,  B23B27/148 ,  C04B35/117 ,  C04B35/119

摘要： There is disclosed an Al.sub.2 O.sub.3 based ceramic which includes 5% to 50% by weight of a hard dispersed phase of at least one compound selected from metal carbide, metal nitride, metal carbonitride, metal oxy-carbide, metal oxy-nitride and metal carbo-oxy-nitride. The compound is represented by M(CNO), wherein M is at least one metal selected from the group consisting of Ti, Zr and Hf. The ceramic contains no greater than 25% by weight of ZrO.sub.2, and balance Al.sub.2 O.sub.3 matrix. which contains an additive dissolved in the Al.sub.2 O.sub.3 grains so as to form solid solution therewith. The additive is contained in an amount of 0.01% to 12% by weight with respect to the Al.sub.2 O.sub.3 matrix and is at least one oxide of an element selected from the group consisting of Y, Mg, Cr, Ni, Co, and rare earth elements. The Al.sub.2 O.sub.3 grains have an average grain size no larger than 1.0 .mu.m while the hard phase constituent has an average grain size no larger than 0.6 .mu.m.

公开(公告)号：US5275981A

公开(公告)日：1994-01-04

申请号：US932195

申请日：1992-08-20

申请人： Akio Nishiyama ,  Takashi Koyama ,  Yasutaka Aikawa ,  Hideo Ohshima ,  Yuichiro Terao ,  Munenori Kato ,  Akio Sakai

发明人： Akio Nishiyama ,  Takashi Koyama ,  Yasutaka Aikawa ,  Hideo Ohshima ,  Yuichiro Terao ,  Munenori Kato ,  Akio Sakai

IPC分类号： B23B27/14 ,  C04B35/111 ,  C04B35/117 ,  C04B35/119 ,  C04B35/56 ,  C04B35/58

CPC分类号： C04B35/111 ,  B23B27/148 ,  C04B35/117 ,  C04B35/119

摘要： There is disclosed an Al.sub.2 O.sub.3 based ceramic which includes 5% to 50% by weight of a hard dispersed phase of at least one compound selected from metal carbide, metal nitride, metal carbonitride, metal oxy-carbide, metal oxy-nitride and metal carbo-oxy-nitride. The compound is represented by M(CNO), wherein M is at least one metal selected from the group consisting of Ti, Zr and Hf. The ceramic optionally contains 1% to 25% by weight of ZrO.sub.2, and balance Al.sub.2 O.sub.3 matrix, which contains an additive dissolved in the Al.sub.2 O.sub.3 grains so as to form solid solution therewith. The additive is contained in an amount of 0.01% to 12% by weight with respect to the Al.sub.2 O.sub.3 matrix and is at least one oxide of an element selected from the group consisting of Y, Mg, Cr, Ni, Co, and rare earth elements. The Al.sub.2 O.sub.3 grains have an average grain size no larger than 1.0 .mu. m while the hard phase constituent has an average grain size no larger than 0.6 .mu. m.

摘要翻译： 公开了一种Al 2 O 3系陶瓷，其包含5重量％至50重量％的硬分散相的至少一种选自金属碳化物，金属氮化物，金属碳氮化物，金属氧化碳，金属氮化物和金属碳氮化物的化合物， 氧氮化物。 该化合物由M（CNO）表示，其中M是选自Ti，Zr和Hf中的至少一种金属。 陶瓷任选含有1重量％至25重量％的ZrO 2，并且余量为Al 2 O 3基质，其含有溶解在Al 2 O 3颗粒中的添加剂以便与其形成固溶体。 相对于Al 2 O 3基质，添加剂的含量为0.01〜12重量％，是选自Y，Mg，Cr，Ni，Co和稀土元素中的至少一种元素的氧化物 。 Al 2 O 3粒子的平均粒径不大于1.0（my）m，而硬相成分的平均粒径不大于0.6（my）m。

公开(公告)号：US5130279A

公开(公告)日：1992-07-14

申请号：US649482

申请日：1991-02-01

申请人： Takashi Koyama ,  Hideo Ohshima ,  Yasutaka Aikawa

发明人： Takashi Koyama ,  Hideo Ohshima ,  Yasutaka Aikawa

IPC分类号： C04B35/593 ,  C04B41/50 ,  C04B41/87

CPC分类号： C04B41/009 ,  C04B35/5935 ,  C04B41/5042 ,  C04B41/87

摘要： There is disclosed a silicon nitride based sintered material which contains 0.1% to 20% by volume of zirconium oxide, 0.1% to 14% by volume of zirconium nitride, 3% to 15% by volume of a binder phase of an Mg-Si-O-N or Mg-Si-Zr-O-N system, and balance .beta.-silicon nitride. The sintered material may include an oxide layer of an average thickness of 10 to 1,000 .mu.m in a surface thereof and having a zirconium oxide concentration increasing toward the surface thereof. A process specifically adapted to manufacture the above sintered material is also disclosed.