Liquid phase sintering of silicon carbide
US4829027A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1988 |
| Grant date | May 9, 1989 |
| Priority date | — |
| Expiry date | Apr 21, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/5755
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Liquid phase sintering is used to densify silicon carbide based ceramics using a compound comprising a rare earth oxide and aluminum oxide to form liquids at temperatures in excess of 1600.degree. C. The resulting sintered ceramic body has a density greater than 95% of its theoretical density and hardness in excess of 23 GPa. Boron and carbon are not needed to promote densification and silicon carbide powder with an average particle size of greater than one micron can be densified via the liquid phase process. The sintered ceramic bodies made by the present invention are fine grained and have secondary phases resulting from the liquid phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.