Liquid jet removal of plasma sprayed and sintered coatings
AssigneeWaterjet Systems, Inc.
InventorsCharles C. McComas, John W. Appleby, Jr., Gerard A. Sileo, Herbert R. Barringer, Michael J. Patry
Life of this patent
Estimating the term…
Abstract
Gas turbine engine coatings must often be removed during engine maintenance and repair. The techniques utilized to accomplish this task, machining, chemical stripping, machining followed by chemical stripping, or grit blasting, frequently result in component damage or destruction. Liquid jet erosion can be utilized to remove seals, coatings, or portions thereof without damaging the engine hardware.
Claims23
A method for removing a top coat from a bond ..coating.!. coat adhered to a substrate, utilizing a liquid jet, said liquid jet having means for directing the liquid jet, means for creating sufficient pressure to remove the ..coating.!. top coat , means to provide the relative motion between the ..coating.!. top coat and the liquid jet, and means for supplying the liquid, which comprises:
- a. creating sufficient pressure to remove the ..coating.!. top coat ;
- b. providing relative motion between the ..coating.!. top coat and the liquid jet;
- c. supplying the liquid;
- d. causing the liquid to strike the top coat, wherein the liquid striking the top coat causes top coat erosion until the bond coat is exposed;
- whereby the bond coat and the substrate suffer essentially no damage and can be reused.
A method for removing a protective coating applied to a substrate which comprises:
- directing a liquid jet at a pressure above approximately 20,000 psi at the protective coating such that the liquid jet strikes the protective coating thereby removing the protective coating from the substrate whereby the substrate may be reused.
Dependencies are inferred from the claim text.