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Thermal barrier coatings, components, method and apparatus for determining past-service conditions and remaining life thereof

United States Patent

September 13, 2005
View the Complete Patent at the US Patent & Trademark Office
A method for determining past-service conditions and/or remaining useful life of a component of a combustion engine and/or a thermal barrier coating ("TBC") of the component comprises providing a photoluminescent ("PL") material in the TBC, directing an exciting radiation at the TBC, measuring the intensity of a characteristic peak in the emission spectrum of the PL material, and correlating the intensity of the characteristic peak or another quantity derived therefrom to an amount of a new phase that has been formed as a result of the exposure of the component to extreme temperatures. An apparatus for carrying out the method comprises a radiation source that provides the exciting radiation to the TBC, a radiation detector for detecting radiation emitted by the PL material, and means for relating a characteristic of the emission spectrum of the PL material to the amount of the new phase in the TBC, thereby inferring the past-service conditions or the remaining useful life of the component.
Srivastava; Alok Mani (Niskayuna, NY), Setlur; Anant Achyut (Niskayuna, NY), Comanzo; Holly Ann (Niskayuna, NY), Devitt; John William (Clifton Park, NY), Ruud; James Anthony (Delmar, NY), Brewer; Luke Nathaniel (Clifton Park, NY)
General Electric Company (Niskayuna, NY)
10/ 779,826
February 17, 2004
This invention was first conceived or reduced to practice in the performance of work under contract DE-FC26-01NT41021 awarded by the United States Department of Energy. The United States of America may have certain rights to this invention.