Bimodal silicon nitride BAS ceramic composites
US6291376A · kind A · utility
Inventors
Key dates
| Filing date | Oct 19, 2000 |
| Grant date | Sep 18, 2001 |
| Priority date | — |
| Expiry date | Oct 19, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/584
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A composition and method of fabricating pressureless sintered 70 volume % silicon nitride--30 volume % barium aluminum silicate ceramic composites. The composites are made from 70 volume % silicon nitride, containing varying amounts and size distributions of initial .beta.-silicon nitride, and 30 volume % barium aluminum silicate. The resulting ceramic composites contain microstructures with coarse .beta.-silicon nitride whiskers, as well as narrow distributions of short .beta.-silicon nitride whiskers, surrounded by fine barium aluminum silicate grains. The resulting composites exhibit improved fracture toughness and flexural strength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.