Sintered body of silicon nitride and a process for making the same
US5081079A · kind A · utility
7Cited by
4References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 17, 1990 |
| Grant date | Jan 14, 1992 |
| Priority date | — |
| Expiry date | Aug 17, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF28F21/04
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A sintered body composed of .alpha.'-silicon nitride and .beta.'-silicon nitride, and having a surface portion which contains a greater proportion of .alpha.'-silicon nitride than its inner portion does. It has high strength and excellent wear resistance. It is produced by preparing a molded body from a sintering material, disposing about the molded body a sintering material which can form a sintered product containing a greater proportion of .alpha.'-silicon nitride than the sintered product of the molded body will, and sintering the molded body and the material disposed about it.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.