Optimizing functionally graded nickel-zirconia coating profiles for thermal stress relaxation

The investigations on optimization of composite composition of nickel-zirconia for the functionally graded layered thermal barrier coating for the lowest but uniform stress field under thermal loading is presented The procedure for obtaining temperature- and composition-dependent thermal and mechanical properties of various coating compositions is discussed These material parameters were used in thermo-mechanical finite element stress analyses of a nickel substrate with the coating The results showed that the Von-Mises stresses in the substrate and the interfaces were the lowest with the coating profile that followed a concave power law relationship with the index n approximate to 2 65 (C) 2010 Elsevier B V All rights reserved