Conversion of polycarbosilanes into silicon carbonitride ceramics
US5049529A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 27, 1989 |
| Grant date | Sep 17, 1991 |
| Priority date | — |
| Expiry date | Nov 27, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Silicon carbonitride ceramic materials are produced by (a) hardening a fusible polycarbosilane containing at least two .tbd.SiH groups per molecule by intimately contacting such fusible polycarbosilane with an effective hardening amount of the vapors of sulfur, next (b) heat treating the infusible polycarbosilane which results under an ammonia atmosphere to such extent as to introduce nitrogen into the infusible polycarbosilane without completely removing the carbon therefrom, and then (c) heat treating the nitrogenated polycarbosilane in a vacuum or in an inert atmosphere to such extent as to essentially completely convert it into a ceramic silicon carbonitride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.