Thermal barrier coatings for thermal insulation and corrosion resistance in industrial gas turbine engines

Abstract Four thermal barrier coatings were subjected to a 500 h gas turbine engine test. The coatings were two Y 2 O 3 -stabilized ZrO 2 composites, Ca 2 SiO 4 and CaTiO 3 . The Ca 2 SiO 4 coating exhibited significant spalling. Y 2 O 3 -stabilized ZrO 2 and CaTiO 3 coatings showed little degradation except in blade leading edge areas. Post- test examination showed variations in the coating due to manual application techniques. Improved process control is required if engineering quality coatings are to be developed. The results indicate that some leading edge loss of the coating can be expected near the tip.