39. Microstructure and Mechanical Properties of Atmospheric Plasma Sprayed 8YSZ Thermal Barrier Coatings

Thermal Barrier Coatings (TBCs) are favorable to provide better thermal insulation to hot components of gas turbine and aero engines leading to improve durability. The TBCs were prepared using a NiCoCrAlY as a bond coat and 8YSZ as a top coat with the thickness range of 100 ± 25 μm and 250 ± 25 µm respectively, by atmospheric plasma spray. This paper presents the study of surface microstructure and mechanical properties of 8YSZ TBC. The surface microstructure was examined by scanning electron microscopy and microhardness was by the microindentation test. Also, the surface roughness and elemental composition present in the coating was studied with surface profilometer and energy dispersive x-ray spectrometry. At the high-temperature conditions, PYSZ has a good combination of thermal, physical, and mechanical properties. Therefore, it is favorable to select the partially stabilized zirconia coatings as TBCs for improvement in the thermal insulation and protection from high inlet gas temperature.