Method for smoothing the surface of a protective coating
AssigneeGeneral Electric Company
InventorsD. Sangeeta, Curtis Alan Johnson, Warren Arthur Nelson
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Abstract
A method for smoothing the surface of a ceramic-based protective coating which exhibits roughness is disclosed. The method includes the steps of applying a ceramic-based slurry or gel coating to the protective coating surface; heating the slurry/gel coating to remove volatile material; and then further heating the slurry/gel coating to cure the coating and bond it to the underlying protective coating. The slurry/gel coating is often based on yttria-stabilized zirconia, and precursors of an oxide matrix. Related articles of manufacture are also described.
Claims16
An article, comprising:
- (I) a metal-based substrate;
- (II) a ceramic-based protective coating applied over the substrate;
- and
- (III) a ceramic-based slurry/gel overcoat over the surface of the protective coating.
An article comprising:
- (I) a metal-based substrate;
- (II) a ceramic-based protective coating applied over the substrate;
- and
- (III) a cured, ceramic-based slurry/gel coating over the surface of the protective coating.
The article of 11, wherein the thermal barrier coating has been applied by plasma-spraying.
An article, comprising:
- (I) a superalloy-based substrate;
- (II) a zirconia-based thermal barrier coating applied over the substrate;
- and
- (III) a cured, ceramic-based slurry/gel overcoat over the surface of the thermal barrier coating.
Dependencies are inferred from the claim text.