Thermal barrier coatings (TBCs) are used in advanced gas turbines to protect metallic components against high temperatures. In most commercial applications, zirconia partially stabilized with yttria,

7~8 wt.% Y2O3-ZrO2 (7YSZ), is the material of choice due to its low thermal conductivity and high thermal expansion coefficient. In this study, thermal barrier coatings were sprayed from various 7YSZ feedstock materials that contain different amount of impurities. Processing conditions are the same for all coatings and the as-sprayed coatings exhibit similar microstructure. Sintering resistance and thermal cyclic life of these coatings were investigated and compared.