Method for manufacture of silicon nitride
US4396587A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 1981 |
| Grant date | Aug 2, 1983 |
| Priority date | — |
| Expiry date | Aug 18, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/62
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Silicon nitride of improved quality is obtained by using a liquid silicic acid or modified liquid silicic acid as a silicic substance and carbon in a powdered form, a precursor of carbon in a powdered form, or a precursor of carbon in the form of a solution as a carbonaceous substance, and thermally treating these raw materials in a non-oxidative atmosphere containing nitrogen. By this method, .alpha.-type silicon nitride can be easily obtained. Particularly, finely divided .alpha.-type silicon nitride suitable for use as the raw material for the production of high-strength sintered articles is also produced. .alpha.-type silicon nitride whiskers useful as a reinforcing material for ceramic and metallic articles is also obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.