Process for sintering silicon nitride compacts
US4354990A · kind A · utility
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32Claims
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Key dates
| Filing date | Aug 25, 1980 |
| Grant date | Oct 19, 1982 |
| Priority date | — |
| Expiry date | Aug 25, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22F2003/1042
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Sintered silicon nitride articles are prepared by sintering a silicon nitride compact of a density of at least 1.3 g/cm.sup.3 in nitrogen gas atmosphere at substantially atmospheric pressure, while the compact is embedded in a protective powder comprising silicon nitride, boron nitride, or a mixture of silicon nitride and boron nitride, and one or more sinterization additives for silicon nitride, said additives being present in the protective powder in an amount of from 3 to 20% by weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.