Structral articles
US5260096A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 1987 |
| Grant date | Nov 9, 1993 |
| Priority date | — |
| Expiry date | Jun 11, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B41/91
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A structural article for high temperature applications comprises a body formed of at least partially consolidated, particulate silicon nitride, a conformal outer coating of silicon nitride or silicon carbide on the body, and a conformal intermediate layer of a silicon, oxygen and nitrogen-containing compound, i.e. silicon oxynitride, chemically bonded to both the body and the outer coating. The method for making such an article comprises providing a body formed of at least partially consolidated, particulate silicon nitride, oxidizing the surface of the body, removing silicon dioxide from the oxidized surface of the body; and chemically vapor depositing a conformal outer coating of silicon nitride or silicon carbide. The conformal outer coating provides a protective envelope around and assists in high temperature isostatic pressing of the body and hence permits one to use the structural article in isostatic pressing processes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.