公开(公告)号：US5106550A

公开(公告)日：1992-04-21

申请号：US192434

申请日：1988-05-11

申请人： Tetsuji Yogo ,  Yoshinori Hattori ,  Motohide Ando ,  Yasushi Katano

发明人： Tetsuji Yogo ,  Yoshinori Hattori ,  Motohide Ando ,  Yasushi Katano

IPC分类号： F01D5/04 ,  C04B37/00 ,  F04D29/28

CPC分类号： C04B37/001 ,  C04B35/584 ,  C04B35/645 ,  C04B2235/6562 ,  C04B2235/658 ,  C04B2237/32 ,  C04B2237/343 ,  C04B2237/36 ,  C04B2237/368 ,  C04B2237/568

摘要： A ceramic rotor is constituted by a shaft portion and a disk portion. The shaft portion and the disk portion are joined to constitute a single body by sintering. The shaft portion and the disk portion are so formed that the amount of contraction of the shaft portion at the time of sintering is larger by 0.1% to 3% than that of the disk portion such that compresson stress is induced in the disk portion.

摘要翻译： 陶瓷转子由轴部和盘部构成。 轴部和盘部通过烧结连接构成一体。 轴部和盘部形成为使得烧结时的轴部的收缩量比盘部分的收缩量大0.1％〜3％，从而在盘部中产生压缩应力。

公开(公告)号：US5472919A

公开(公告)日：1995-12-05

申请号：US335967

申请日：1994-11-03

申请人： Mamoru Mitomo ,  Naoto Hirosaki ,  Motohide Ando

发明人： Mamoru Mitomo ,  Naoto Hirosaki ,  Motohide Ando

IPC分类号： C04B35/584 ,  C04B35/593 ,  C04B35/587

CPC分类号： C04B35/5935 ,  C04B35/584

摘要： A high strength and toughness .beta.-silicon nitride sintered body suitable for the material of a variety of structural parts. The sintered body contains .beta.-silicon nitride (Si.sub.3 N.sub.4) in an amount not less than 95% by weight of total silicon nitride; oxygen in a total amount not more than 3% by weight of the sintered body; and columnar grains each of which has a diameter not less than 5 .mu.m and an aspect ratio not less than 5, the columnar grains being in an amount not less than 0.5% by volume of total of raw materials in the sintered body; the sintered body having a bulk density not less than 96% of a theoretical density. Such a sintered body is produced by a method comprising the following steps in the sequence set forth: preparing powder of a starting material including .beta.-silicon nitride in an amount not less than 80% by weight of the starting material; adding oxide of at least one element selected from the group IIIa of the periodic table of elements in an amount ranging from 0.2% to 6% by weight (as a sintering assistant) to the starting material powder to form a mixture powder; compacting the mixture powder to form a compact; firing the compact under a nitrogen gas pressure ranging from 1 to 500 atm. at a temperature ranging from 1700.degree. to 2100 .degree. C. to form the sintered body; and continuing the firing step until a bulk density of the sintered body reaches a value not less than 96% of a theoretical density of the sintered body.

摘要翻译： 高强度和韧性的β-氮化硅烧结体适用于各种结构部件的材料。 烧结体含有不小于总氮化硅的95重量％的β-氮化硅（Si 3 N 4）。 氧的总量不超过烧结体的3重量％; 柱状晶粒各自具有不小于5μm的直径和不小于5的纵横比，柱状晶粒的量不小于烧结体中原料总量的0.5体积％; 所述烧结体的体积密度不小于理论密度的96％。 这样的烧结体通过包括下列步骤的方法制备：制备起始材料的粉末，该原料包括起始材料重量不小于80重量％的β-氮化硅; 添加选自元素周期表第IIIa族元素中的至少一种元素的氧化物，其量为0.2％至6％（重量）（作为烧结助剂）至原料粉末以形成混合物粉末; 压制混合粉末以形成紧凑型; 在1〜500atm的氮气压力下烧结压块。 在1700〜2100℃的温度下形成烧结体; 继续烧成工序直到烧结体的体积密度达到烧结体的理论密度的96％以上。

公开(公告)号：US5401450A

公开(公告)日：1995-03-28

申请号：US992657

申请日：1992-12-18

申请人： Mamoru Mitomo ,  Naoto Hirosaki ,  Motohide Ando

发明人： Mamoru Mitomo ,  Naoto Hirosaki ,  Motohide Ando

IPC分类号： C04B35/584 ,  C04B35/593 ,  C04B35/58

CPC分类号： C04B35/5935 ,  C04B35/584

摘要： A high strength and toughness .beta.-silicon nitride sintered body suitable for the material of a variety of structural parts. The sintered body contains .beta.-silicon nitride (Si.sub.3 N.sub.4) in an amount not less than 95% by weight of total silicon nitride; oxygen in a total amount not more than 3% by weight of the sintered body; and columnar grains each of which has a diameter not less than 5 .mu.m and an aspect ratio not less than 5, the columnar grains being in an amount not less than 0.5% by volume of total of raw materials in the sintered body; the sintered body having a bulk density not less than 96% of a theoretical density. Such a sintered body is produced by a method comprising the following steps in the sequence set forth: preparing powder of a starting material including .beta.-silicon nitride in an amount not less than 80% by weight of the starting material; adding oxide of at least one element selected from the group IIIa of the periodic table of elements in an amount ranging from 0.2% to 6% by weight (as a sintering assistant) to the starting material powder to form a mixture powder; compacting the mixture powder to form a compact; firing the compact under a nitrogen gas pressure ranging from 1 to 500 atm. at a temperature ranging from 1700.degree. to 2100.degree. C. to form the sintered body; and continuing the firing step until a bulk density of the sintered body reaches a value not less than 96% of a theoretical density of the sintered body.

摘要翻译： 高强度和韧性的β-氮化硅烧结体适用于各种结构部件的材料。 烧结体含有不小于总氮化硅的95重量％的β-氮化硅（Si 3 N 4）。 氧的总量不超过烧结体的3重量％; 柱状晶粒各自具有不小于5μm的直径和不小于5的纵横比，柱状晶粒的量不小于烧结体中原料总量的0.5体积％; 所述烧结体的体积密度不小于理论密度的96％。 这样的烧结体通过包括下列步骤的方法制备：制备起始材料的粉末，该原料包括起始材料重量不小于80重量％的β-氮化硅; 添加选自元素周期表第IIIa族元素中的至少一种元素的氧化物，其量为0.2％至6％（重量）（作为烧结助剂）至原料粉末以形成混合物粉末; 压制混合粉末以形成紧凑型; 在1〜500atm的氮气压力下烧结压块。 在1700〜2100℃的温度下形成烧结体; 继续烧成工序直到烧结体的体积密度达到烧结体的理论密度的96％以上。