High temperature thermal fatigue life prediction of plasma sprayed thermal barrier coatings structure

According to the deformation characteristics of plasma sprayed ceramic thermal barrier coatings (TBC) structure and the summary of research for thermal fatigue life of TBC structure, high temperature oxidation test and thermal fatigue test of thermal barrier coating structures were designed and conducted. Based on the high temperature oxidation data and Fick's second law of diffusion, Al depletion model of bond coating was established. Then, Al concentration of bond coating was introduced to existing life prediction model. Combined with the thermal fatigue test data, life prediction model was established, which can characterize the coupling effect of oxidation damage and thermal fatigue damage. The life prediction results are reasonable and the method is feasible.