Preparation and sintering of refractory metal borides, carbides and nitrides of high purity
US4693989A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 29, 1985 |
| Grant date | Sep 15, 1987 |
| Priority date | — |
| Expiry date | May 29, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C1/058
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention relates to the production of desirably consolidated high purity refractory metal borides, carbides, nitrides, or mixtures, combinations of cermets thereof. In the preparation, a second stage reaction is conducted at reduced pressure and sintering temperature. Furthermore, it is carried out in the presence of sintering aid which can be initially present as a particulate material and, as such, may be incorporated with other reaction ingredients. Sintering aid, in a dual role, may serve not only as an assistant in the second stage reaction, but also as a reaction participant. Moreover, during such rection at sintering conditions, the sintering assistance is obtained by means of sintering aid vapor. High purity products of desirable microstructure can be achieved, having densities on the order of 90 percent or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.