Process for producing Si.sub.3 N.sub.4 base articles by the cold press sinter method
US4280973A · kind A · utility
34Cited by
14References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1979 |
| Grant date | Jul 28, 1981 |
| Priority date | — |
| Expiry date | Nov 14, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/597
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of making Si.sub.3 N.sub.4 based cutting tools (and the resulting product) is disclosed. A mixture is formed of three powders: a first powder of at least 75% crystalline Si.sub.3 N.sub.4, a second powder selected from the group Y.sub.2 O.sub.3, MgO, CeO.sub.2 and ZrO.sub.2, and a third powder selected from the group consisting of Al.sub.2 O.sub.3, WC, Wsi.sub.2, W and TiC. The mixture is cold pressed to a density of 50-70% of theoretical and then sintered to full density without the application of pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.