Abradable thermal barrier coating for CMC structures
US6541134B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 2000 |
| Grant date | Apr 1, 2003 |
| Priority date | — |
| Expiry date | Oct 9, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/30
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A bond coating is applied between a ceramic matrix composite and a insulative and abradable top coat layer. The bond coating is a slurry layer of fine particles of silicon nitride and silicon carbide suspended in a colloidal silica or zircon binder. The ratio of these materials in the bond coating should match the ratio of these in the CMC. If the CMC is SiC fibers in a SiC matrix, the slurry should be composed of SiC particles with a colloidal silica binder. High surface roughness is achieved by entrapping coarse ceramic particles into the wet bond coating slurry. Thereafter the product is heat treated to maximize bond strength and verify oxidation resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.