Preheat method for EBPVD coating
OwnerSteven M. Burnsinventor
Life of this patent
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Abstract
A method is described for reducing surface oxide growth which heating aluminum containing surfaces in a vacuum environment prior to the deposition of a ceramic coating. The method comprises flowing an inert or non reactive gas into the coating apparatus adjacent to the surface to be coated to reduce oxygen reaction with the surface.
Claims14
A method for heating a part in a vacuum environment which comprises:
- heating said part while simultaneously providing a gas selected from the group comprising inert and non reactive gases and mixtures thereof to the region immediately surrounding the part and maintaining the part in a vacuum environment;
- whereby oxidation of said part due to oxygen in said vacuum environment is reduced.
A method for preheating a gas turbine component in a vacuum environment prior to the application of a ceramic coating, wherein said gas turbine component has an outer surface which contains aluminum, which comprises:
- adding a gas selected from the group consisting of Ar, He, N, H, Xe, Kr, and mixtures thereof into the region immediately surrounding the part to reduce the rate of alumina formation during preheating.
In an apparatus applying a ceramic coating to a substrate by EBPVD, of the type which includes a vacuum chamber, means for producing a vacuum in said chamber and means to preheat said substrate prior to application of said coating, the improvement which comprises:
- means to inject a gas selected from the group comprising inert and non reactive gases, and mixtures thereof into the region surrounding the substrate during the preheat step preceding ceramic coating application.
Dependencies are inferred from the claim text.