Thermomechanical Analysis of the Effect of Adding Alumina to the Plasma Sprayed Thermal Barrier Coating Using Finite Element Analysis

In this study, a set of possible conditions for the addition of alumina to the thermal barrier coating system was considered,
taking into account the experimental results reported by other researchers, from the point of view of the optimal state of adding the alumina to the thermal barrier coating system, in terms of increasing oxidation resistance and hot corrosion. The heat transfer and distribution of stress have been discussed and studied in a comparative and absolute manner. The results showed that in alumina-containing samples, the critical area of concentration of stress is in the interface of the layers containing alumina. Also, the maximum stress values in alumina-containing samples are higher than those with no alumina. Due to the higher thermal conductivity of alumina than YSZ, the addition of alumina to the thermal barrier coating system weakens the thermal insulation property.