Method of protecting products of composite material against oxidizing and products protected thereby
US5622751A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 8, 1996 |
| Grant date | Apr 22, 1997 |
| Priority date | — |
| Expiry date | Jan 8, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/9684
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The method comprises forming a coating on the product of composite material to be protected. The coating contains a mixture of a non-oxide refractory ceramic in finely-divided form, at least one refractory oxide in finely-divided form and providing healing properties by forming a glass, and a binder constituted by a polymer that is a precursor of a non-oxide refractory ceramic. The polymer is transformed into a ceramic to obtain a protective layer comprising a non-oxide refractory ceramic phase and a healing phase which together constitute two interpenetrating lattices. After the ceramic precursor polymer has been transformed, a final heat treatment step may be performed at a temperature higher than the softening or melting temperature of the healing phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.