Production of whisker-free Si.sub.3 N.sub.4 particulates by carbonitriding SiO.sub.2
US5378666A · kind A · utility
4Cited by
4References
14Claims
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Key dates
| Filing date | Jul 2, 1992 |
| Grant date | Jan 3, 1995 |
| Priority date | — |
| Expiry date | Jul 2, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Whisker-free particulates of silicon nitride (Si.sub.3 N.sub.4), e.g., spheres, beads, or a variety of other shaped articles exhibiting a regular and controlled particle size, are produced by incorporating a primary reaction mixture of silica and carbon into a porous, carbon-based matrix material, next carbonitriding the composite thus formed, and characteristically eliminating excess carbon from the carbonitrided composite.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.