Making hot pressed silicon nitride by use of low density reaction bonded body
US4946630A · kind A · utility
11Cited by
13References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 12, 1982 |
| Grant date | Aug 7, 1990 |
| Priority date | — |
| Expiry date | Oct 12, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/593
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of making a silicon nitride comprising object by use of a low density reaction bonded body is disclosed. An uncompacted mixture of silicon powder and a fluxing agent is heated in a nitrogen atmosphere to react the mixture with the atmosphere to form a body consisting essentially of silicon nitride and having a dimension greater than and a density less than the finished product. The nitrided mixture is then hot pressed to produce a silicon nitride comprising object of desired dimension and density, which material is useful as a cutting tool material for machining metals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.