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Thermal barrier coating (TBC) provides insulation to the base part and is widely used in aviation, power generation, and automotive industries to improve the service life of component being exposed to high temperatures. Delamination is a common failure mechanism of TBC and occurs after a critical number of thermal cycles. In this paper, detection of delamination in TBC system is presented. Pulsed thermography (PT) as a non-contact non-destructive evaluation (NDE) technique was employed to examine the delamination in TBCs. Time-dependent thermal images were used to characterize the delamination. The results showed that there was a relationship between the temperature distribution of the surface and delamination in TBCs.

Investigation of Delamination in Thermal Barrier Coating by Pulsed Thermography