Method for preparing silicon nitride based ceramics
US5603877A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 1995 |
| Grant date | Feb 18, 1997 |
| Priority date | — |
| Expiry date | May 1, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/80
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Si.sub.3 N.sub.4 based ceramics are prepared by molding, calcining and sintering a powder mixture of columnar-shaped Si.sub.3 N.sub.4 particles having a particular size, a minor quantity of sintering aids and equiaxed Si.sub.3 N.sub.4 particles. The ceramics have a structure containing a specific quantity of coarse columnar grains grown from the coarse columnar-shaped particles as seed crystals, and superior in wear resistance, resistance to chipping and thermal resistance, and useful as wear resistant components or cutting tools. The ceramics can be produced without recourse to hot press sintering by normal sintering or sintering under a gas pressure, or further by applying HIP.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.