Environmental coating for nickel aluminide components and a method therefor
US5837385A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1997 |
| Grant date | Nov 17, 1998 |
| Priority date | — |
| Expiry date | Mar 31, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12944
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An environmental coating and a method for forming the coating on a nickel aluminide component designed for use in a hostile thermal environment, such as turbine, combustor and augmentor components of a gas turbine engine. The environmental coating includes a metal that has been diffused into the surface of the nickel aluminide component, and an aluminum oxide layer on the surface of the nickel aluminide component. According to this invention, the metal is one or more noble metals, chromium and/or an MCr alloy, and forms a diffusion region comprising noble metal-aluminides and/or chromium-aluminides. The environmental coating optionally contains up to about 1.0 atomic percent of at least one oxygen-active element, such as yttrium, hafnium, zirconium and/or cerium. According to the invention, the environmental coating need only consist of the diffusion region and the aluminum oxide layer, and therefore does not require additional environmentally-resistant layers (e.g., diffusion aluminides or MCrAlY coatings) to protect the underlying nickel aluminide substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.