Sintered body of silicon nitride
US5120682A · kind A · utility
7Cited by
5References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1990 |
| Grant date | Jun 9, 1992 |
| Priority date | — |
| Expiry date | Dec 21, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/597
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A sintered body of silicon nitride composed of .alpha.'-Si.sub.3 N.sub.4 and .beta.'-Si.sub.3 N.sub.4, the former being represented by the formula Y.sub.x (Si,Al).sub.12 (O,N).sub.16 (where the value of x, which denotes the amount of occluded Y, is in the range of 0<x<0.3), with the value of x for .alpha.'-Si.sub.3 N.sub.4 in the outer part of the sintered body being greater than for .alpha.'-Si.sub.3 N.sub.4 in the inner part of the sintered body. The sintered body will find use as high-temperature structural material owing to its high strength and high toughness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.