Method of protecting a component against hot corrosion and a component protected by said method
US8596985B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 2007 |
| Grant date | Dec 3, 2013 |
| Priority date | — |
| Expiry date | Apr 5, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24926
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method of protecting a component, in particular a turbine blade, from the effects of hot corrosion includes the steps of applying a chromium diffusion coating to the component and applying a coating of a ceramic material to one or more selected regions of the chromium diffusion coating. The selected regions are regions which, in subsequent use of the component, are subjected to temperatures lower than a predetermined temperature. The ceramic material preferably includes a binder combined with a metal oxide. In a preferred embodiment, a turbine blade is coated over the whole of its internal and external surfaces with the chromium diffusion coating; an aluminum diffusion coating is then applied, through a mask, to the aerofoil surfaces and the internal surfaces of the blade; the mask is removed and the ceramic material is applied as an overlay to the chromium diffusion coating in a region between the platform and the root of the blade.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.