METHOD OF COATING AND A SHIELD FOR A COMPONENT

• US 20090104356A1
• Filed: 12/02/2008
• Published: 04/23/2009
• Est. Priority Date: 01/04/2005
• Status: Active Grant

• Current Assignee: Rtx Corporation
• Original Assignee: Dean N. Marszal, Harvey R. Toppen
• Inventors: Marszal, Dean N., Toppen, Harvey R.
• Granted Patent: US 7,939,135 B2
• Time in Patent Office: Days
• US Class Current: 427/300
• CPC Class Codes: B05B 12/20 Masking elements, i.e. elements defining uncoated areas on an object to be coated
• CPC Class Codes: C25D 5/022 using masking means

Abstract

A gas turbine engine is used for power generation or propulsion and includes vanes. Each vane includes a trailing edge having a curvature and cooling slots that cool the vane. A photochemical edge shield includes an edge and projections that project from the edge. Before coating the vane, the photochemical edge shield is positioned on the vane such that each of the projections is received in one of the cooling slots. A ceramic coating is then applied to the vane. The photochemical edge shield prevents the ceramic coating from entering and clogging the cooling slots of the vane during the ceramic coating process.

Claims

1. A method of shielding an airfoil during application of a coating on the airfoil, the method comprising the step of:

inserting at least one projection of a shield into a corresponding at least one opening in an airfoil to prevent a coating from entering the corresponding at least one opening of the airfoil.

2. The method as recited in claim 1 wherein the airfoil includes a component edge having an airfoil edge curvature and the shield includes a shield edge having a shield edge curvature, wherein the airfoil edge curvature is substantially equal to the shield edge curvature.

3. The method as recited in claim 1 wherein the coating is ceramic.

4. The method as recited in claim 1 wherein the at least one projection comprises a plurality of projections and the corresponding at least one opening includes a plurality of openings, wherein a number of the plurality of projections equals a number of the plurality of openings.

5. The method as recited in claim 4 wherein the shield further includes a shield edge, a recessed edge, and a recessed portion defined between the shield edge and the recessed edge and between each of the plurality of projections.

6. The method as recited in claim 5 wherein the recessed portion has a recessed thickness and the shield and the plurality of projections have a shield thickness, and the recessed thickness is less than the shield thickness.

7. The method as recited in claim 1 further including the step of temporarily securing the shield to the airfoil.

8. The method as recited in claim 1 further including the steps of providing the coating on the airfoil and removing the shield from the airfoil.

9. The method as recited in claim 1 further including the step of locating the shield relative to the airfoil.

10. The method as recited in claim 1 wherein the shield includes a body, a flap, and a joint line having a reduced thickness between the body and the flap, and the airfoil includes a pressure side and a suction side, the method including the step of moving the flap relative to the body along the joint line such that the body is located proximate to the pressure side of the airfoil and the flap is located proximate to the suction side of the airfoil.