Si.sub.3 N.sub.4 formed by nitridation of sintered silicon compact containing boron
US4017319A · kind A · utility
42Cited by
11References
9Claims
0Family size
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Key dates
| Filing date | Jan 6, 1976 |
| Grant date | Apr 12, 1977 |
| Priority date | — |
| Expiry date | Jan 6, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/591
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A polycrystalline silicon nitride body is produced by shaping a particulate mixture of silicon powder and boron into a green body, sintering the body to a density ranging from 60% to 75% of the theoretical density of silicon, said sintered body having pores which are interconnecting and open to the surface of the body, and reacting said sintered body with gaseous nitrogen to convert it to silicon nitride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.