Microstructure, texture and thermal cycling performance of EB-PVD TBCs deposited under different processing conditions

Abstract

The microstructure, texture and thermal cycling life of a thermal barrier coating (TBC) deposited by electron beam physical vapour deposition method under several combinations of substrate pre-heat temperature and rotation speed, have been examined. The yttria stabilized zirconia ceramic coating of the TBC deposited on stationary samples predominantly showed h111i texture, although other texture components such as h220i and h311i were also present. The coatings on the rotated samples exhibited a predominant h100i texture. The h111i texture component was also present in these coatings in varying degrees. The intensity of h111i texture component in the coatings on the rotated samples decreased by increasing the substrate pre-heating temperature. The coating microstructures obtained under various processing conditions were consistent with the previously reported microstructures. No conclusive trend in the effect of texture present in the thermal barrier coatings on their thermal cycling life was observed in this study. Copyright © 2012 De Gruyter.