Simulation of the Thermal Shock Behavior and Residual Stress in Thermal Barrier Coatings Based on Yttrium and Gadolinium Zirconate

In this study, a finite element numerical method was developed to simulate the stress distribution in the conventional and functionaly graded NiCrAlY / YSZ (GZ) plasma sprayed thermal barrier coating on the Inconel 738 substrate. Residual stress was measured using the nanoindentation method and the results used for verification of the numerical results. The results showed that with increasing the amplitude of the interface, the maximum stress decreases and then increases with further amplitude increment. The maximum residual stress increases with increasing thickness. Comparison of stress distribution in YSZ and GZ coatings showed that the use of GZ coating increases residual stress.