Method of making .alpha.-silicon nitride powder
US4428916A · kind A · utility
15Cited by
4References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1979 |
| Grant date | Jan 31, 1984 |
| Priority date | — |
| Expiry date | Sep 26, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/80
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
.alpha.-Silicon nitride powder which is used as a raw material for the preparation of high strength silicon nitride with additives such as magnesia and yttrium oxide, and other sintered materials suitable for high temperatures gas turbine engine components and the like, is prepared by heating a powdered mixture of silica, carbon and at least one component selected from the group consisting of silicon nitride, silicon carbide and silicon oxynitride in a nitrogen containing atmosphere and then optionally subjecting the material to a heat treatment in an oxidizing atmosphere for decarbonization of said material as required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.