High density high strength S13 N4 ceramics prepared by pressureless sintering of partly crystalline, partly amorphous S13 N4 powder
US4073845A · kind A · utility
43Cited by
13References
15Claims
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Key dates
| Filing date | Jan 29, 1976 |
| Grant date | Feb 14, 1978 |
| Priority date | — |
| Expiry date | Jan 29, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/584
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Si.sub.3 N.sub.4 ceramics exhibiting densities and modulus of rupture values heretofore obtainable only by hot pressing are produced by pressureless sintering of powder compacts of partly amorphours, partly crystalline Si.sub.3 N.sub.4 powder containing between 5 and 60 percent by weight of crystalline material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.