Method for concurrent thermal spray and cooling hole cleaning
AssigneeGeneral Electric Company
InventorsBhupendra K. Gupta, Ray Heidorn, Tom Tomlinson, Mark M Glevicky, George E Moertle, Thomas George Holland
Life of this patent
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Abstract
A method for applying a thermal barrier coating to an article having cooling holes and concurrently cleaning obstructions, such as TBC overspray or other debris, from those holes is disclosed. A thermal barrier coating is applied to a first surface of an article having cooling holes. Concurrently therewith, a plurality of particles are projected against a second surface of the article, such that at least some of the particles pass through the cooling holes, strike the overspray constituents prior to cooling, knocking at least some of the obstructions out of the cooling hole.
Claims19
A method comprising:
- providing an article having a first surface and an opposing second surface, the article having one or more cooling holes extending from an opening in the first surface to an opening in the second surface;
- thermal spraying a layer of metallic material overlying the first surface of the article to form a metallic bond coat, wherein thermal spray debris creates an obstruction that at least partially obstructs at least one cooling hole;
- and
- concurrently with the thermal spraying projecting a plurality of abrasive non-metallic particles entrained in a fluid toward the second surface of the article at a pressure in the range of about 30 psi to about 90 psi, at least some of the particles passing through the cooling hole at the second surface opening and removing at least a portion of the obstruction.
A method comprising:
- providing a gas turbine engine component having a first surface and a second surface, the component having one or more cooling holes extending from an opening in the first surface to an opening in the second surface;
- applying a thermal barrier coating by thermal spraying a layer of metallic material overlying the first surface of the component to form a metallic bond coat, wherein metallic thermal spray debris creates an obstruction that at least partially obstructs at least one cooling hole;
- concurrently with the thermal spraying of the layer of metallic material projecting non-metallic abrasive particles toward the second surface of the component, at least some of the non-metallic abrasive particles passing into the cooling hole at the second surface opening, contact the obstruction therein and remove at least a portion of the obstruction therefrom;
- thereafter
- thermal spraying a layer of ceramic material overlying the metallic bond coat, wherein ceramic thermal spray debris creates another obstruction that at least partially obstructs at least one cooling hole;
- and
- concurrently with the thermal spraying of the layer of ceramic material projecting particles at a pressure in the range of about 30 psi to about 90 psi toward the second surface of the component, at least some of the particles passing into the cooling hole at the second surface opening, contact the another obstruction therein and remove at least a portion of the another obstruction therefrom.
Dependencies are inferred from the claim text.