Protective silicon nitride or silicon oxynitride coating for porous refractories
US4187344A · kind A · utility
28Cited by
9References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 27, 1978 |
| Grant date | Feb 5, 1980 |
| Priority date | — |
| Expiry date | Sep 27, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2993
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Porous refractory articles resistant to degradation at high temperatures for example by oxygen, chlorine and the like, are composed of a main body of a porous sintered carbide, nitride, boride or silicide which is coated with silicon nitride or silicon oxynitride. The coating is not only on the surface of the main body of the porous refractory article, but also penetrates the article to a depth at least greater than the depth of the surface pores.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.