Hot corrosion resistant coatings
US4371570A · kind A · utility
18Cited by
0References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 1, 1982 |
| Grant date | Feb 1, 1983 |
| Priority date | — |
| Expiry date | Feb 1, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C28/023
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A coated article and method for producing the coated article are described. The article is provided with a coating system which provides protection against hot corrosion at moderate temperatures (1200-1700.degree. F.). An overlay coating based on a metal selected from the group consisting of iron, nickel or cobalt or mixtures thereof and containing chromium and optionally aluminum, yttrium and/or hafnium is applied to the article to be protected. A silicon rich surface zone is produced at the surface of the overlay coating. Methods including pack cementation and physical vapor deposition are described for producing the coating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.