Thermal Barrier Coating Life Determination
Agency / Branch:
DOD / USAF
Durability of Thermal Barrier Coatings (TBCs) used in gas-turbine engines to thermally protect metal components such as turbine blades from hot combustion gases is a major concern to the aerospace industry and in particular the Air Force. The objective of this project is to develop an analytical approach to determining remaining durable life of thermal barrier coated engine components using Nondestructive Inspection data input. In Phase I, Karta identified oxidation of bond coat as a dominant factor leading to TBC failure. Determining the thickness of the thermally grown oxide (TGO) layer and measuring residual stresses in the TGO layer are critical to developing reliable remaining-life prediction models. Karta will measure the TGO thickness using Impedance Spectroscopy and measure the residual stresses using the Photo-Stimulated Luminescence Piezospectroscopy technique. Analytical models developed in Phase I will be validated by extensive laboratory testing. The proposed NDI techniques will be validated by laboratory tests. Remaining life models developed in Phase I will be validated by burner rig tests to simulate actual engine environments and by testing service run engine components, such as airfoils. The models will use neural network analysis for calculating the remaining life of coatings.
Small Business Information at Submission:
Senior Research Engineer
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