公开(公告)号：US4921554A

公开(公告)日：1990-05-01

申请号：US250018

申请日：1988-09-27

申请人： Carl H. Bates ,  John T. Couhig ,  Paul J. Pelletier

发明人： Carl H. Bates ,  John T. Couhig ,  Paul J. Pelletier

IPC分类号： C04B37/00

CPC分类号： C04B35/6455 ,  C04B37/005 ,  C04B2237/083 ,  C04B2237/365 ,  C04B2237/567 ,  C04B2237/61

摘要： A method of joining two porous bodies of silicon carbide is disclosed. It entails utilizing an aqueous slip of a similar silicon carbide as was used to form the porous bodies, including the sintering aids, and a binder to initially join the porous bodies together. Then the composite structure is subjected to cold isostatic pressing to form a joint having good handling strength. Then the composite structure is subjected to pressureless sintering to form the final strong bond. Optionally, after the sintering the structure is subjected to hot isostatic pressing to further improve the joint and densify the structure. The result is a composite structure in which the joint is almost indistinguishable from the silicon carbide pieces which it joins.

公开(公告)号：US5571760A

公开(公告)日：1996-11-05

申请号：US324937

申请日：1994-10-18

申请人： Vimal K. Pujari ,  Dennis M. Tracey ,  Michael R. Foley ,  Norman I. Paille ,  Paul J. Pelletier ,  Lenny C. Sales ,  Craig A. Willkens ,  Russell L. Yeckley

发明人： Vimal K. Pujari ,  Dennis M. Tracey ,  Michael R. Foley ,  Norman I. Paille ,  Paul J. Pelletier ,  Lenny C. Sales ,  Craig A. Willkens ,  Russell L. Yeckley

IPC分类号： C04B35/593 ,  C04B41/00 ,  C04B41/80 ,  C04B35/587

CPC分类号： C04B41/80 ,  C04B35/593 ,  C04B41/0072

摘要： A silicon nitride ceramic comprising:a) inclusions no greater than 25 microns in length,b) agglomerates no greater than 20 microns in diameter, andc) a surface finish of less than about 8 microinches, said ceramic having a four-point flexural strength of at least about 900 MPa.

摘要翻译： 一种氮化硅陶瓷，其包括：a）长度不大于25微米的夹杂物，b）直径不大于20微米的附聚物，和c）小于约8微英寸的表面光洁度，所述陶瓷具有四点弯曲强度 至少约900MPa。

公开(公告)号：US4925608A

公开(公告)日：1990-05-15

申请号：US249791

申请日：1988-09-27

申请人： Guilio A. Rossi ,  Paul J. Pelletier

发明人： Guilio A. Rossi ,  Paul J. Pelletier

IPC分类号： C04B37/00

CPC分类号： C04B37/001 ,  B82Y30/00 ,  C04B2235/6567 ,  C04B2235/6582 ,  C04B2235/6586 ,  C04B2235/728 ,  C04B2235/781 ,  C04B2237/32 ,  C04B2237/363 ,  C04B2237/365 ,  C04B2237/52 ,  C04B2237/568

摘要： A method of joining two pre-sintered pieces of silicon carbide is disclosed. It entails polishing the surfaces to be joined to a mirror-finish, fitting the polished surfaces together to form a composite structure, and then subjecting the composite structure to hot isostatic pressing under conditions which are sufficient to form a joint which is essentially indistinguishable from the original silicon carbide pieces.

公开(公告)号：US5759481A

公开(公告)日：1998-06-02

申请号：US739107

申请日：1996-10-25

申请人： Vimal K. Pujari ,  Dennis M. Tracey ,  Michael R. Foley ,  Norman I. Paille ,  Paul J. Pelletier ,  Lenny C. Sales ,  Craig A. Willkens ,  Russell L. Yeckley

发明人： Vimal K. Pujari ,  Dennis M. Tracey ,  Michael R. Foley ,  Norman I. Paille ,  Paul J. Pelletier ,  Lenny C. Sales ,  Craig A. Willkens ,  Russell L. Yeckley

IPC分类号： C04B35/593 ,  C04B41/00 ,  C04B41/80 ,  C04B35/584

CPC分类号： C04B41/009 ,  C04B35/593 ,  C04B41/0072 ,  C04B41/80

摘要： A ceramic body comprising at least about 80 w/o silicon nitride and having a mean tensile strength of at least about 800 MPa.

摘要翻译： 一种陶瓷体，其包含至少约80w / o的氮化硅并具有至少约800MPa的平均拉伸强度。

公开(公告)号：US4771950A

公开(公告)日：1988-09-20

申请号：US69735

申请日：1987-07-06

申请人： William S. Coblenz ,  Paul J. Pelletier ,  Guilio A. Rossi

发明人： William S. Coblenz ,  Paul J. Pelletier ,  Guilio A. Rossi

IPC分类号： B02C19/18 ,  C04B35/48 ,  C04B35/486 ,  B02C19/12

CPC分类号： C04B35/486

摘要： Zirconia ceramics containing substantial amounts of metastable tetragonal phase crystallites, so that they are tougher than most other ceramics, can be completely comminuted to powders, without applying any mechanical force, by treatment with water or steam at temperatures well above room temperature. This type of comminution is particularly useful for small, often hollow, spheres produced by rapidly solidifying melts of zirconia and a stabilizing oxide such as yttria. These spheres can be almost completely comminuted to a size suitable for wet vibratory milling by treatment for twenty-four hours at 250 C under sufficient steam pressure to maintain some liquid water in equilibrium.