Conversion of polycarbosilanes into silicon nitride ceramics
US5028571A · kind A · utility
4Cited by
3References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 27, 1989 |
| Grant date | Jul 2, 1991 |
| Priority date | — |
| Expiry date | Nov 27, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B21/068
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Silicon nitride ceramic materials are produced by (a) hardening a fusible polycarbosilane containing at least two .dbd.SiH groups per molecule by intimately contacting such fusible polycarbosilane with an effective hardening amount of the vapors of sulfur, and then (b) pyrolyzing the infusible polycarbosilane which results under an ammonia atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.