Silicon nitride sintered body and process for preparation thereof
US4920085A · kind A · utility
17Cited by
3References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1988 |
| Grant date | Apr 24, 1990 |
| Priority date | — |
| Expiry date | Apr 1, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/5935
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Disclosed is a silicon nitride sintered body comprising 85 to 99 mol % of .beta.-Si.sub.3 N.sub.4, 1 to 5 mol % as the oxide (M.sub.2 O.sub.3) of at least one compound of an element (M) selected from the group consisting of Sc, Vb, Er, Ho and Dy and less than 10 mol % of excessive oxygen (O.sub.2) based on the three components, wherein the excessive oxygen/M.sub.2 O.sub.3 molar ratio is lower than 2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.