In-frame repair of gas turbine components

摘要

A method for in-frame repairing of a thermal barrier coating ( 12 ) on a gas turbine component includes cleaning a desired surface portion ( 10 ) of the component without removing the component from the gas turbine. The method also includes roughening the surface portion in-frame, applying a bond coat ( 68 ) to the surface portion in-frame, and applying a ceramic topcoat ( 70 ) to the bond coat, in-frame. A system ( 28 ) for cleaning the surface portion in-frame includes an abrasive media ( 34 ) having a state change characteristic occurring at a temperature lower than an operating temperature of the gas turbine so that the abrasive media changes from a solid state to another state allowing the media to exit the gas turbine during operation. The system also includes an abrasive media sprayer ( 36 ) to direct a spray of the abrasive media at the desired surface portion.