A Study on the Effects of the Thickness of Top Coat on the Thermal Stresses of a Sprayed Thermal Barrier Coating

용사 열차폐 코팅층의 두께가 열응력에 미치는 영향

Based on the principle of complementary energy an analytical method is developed for determining thermal stress distribution in an thermal barrier coating. This method gives the stress distributions which satisfy the stress-free boundary conditions at the edge. Numerical examples are given in order to verify the method and to investigate the thickness effects of the ZrO$_2$-8wt%Y$_2$O$_3$ top coat on the integrity of thermal barrier coating consisted of IN738LC substrate and MCrAlY bond coat.