Analysis of surface texture of Ni-based super alloy with thermal barrier coating system (TBC) for gas turbine blade

This research work deals with thermal barrier coating (TBC) on superelastic alloys. It is applied in gas turbine components such as blade, vanes, and integral wheels. The purpose of the coating focused on thermal insulation and oxidation resistance. In this experiment, IN738 is subjected to a coating process which is a widely used nickel-based superalloy. IN738 consists of chromium, carbon, cobalt, aluminum, titanium, and traces of molybdenum, tantalum, niobium, tungsten, etc. Carbon, zirconium is in limited trace to improve the cast ability process. IN738 resulted in the finest mechanical properties after it is heat-treated. Thermal conductivity, thermal expansion, and specific heat of IN738 depend on the temperature effect. In this work, the comparison of two different substrates is made by conducting a hot corrosion test, microhardness test, microstructural study and erosion behavior. Two specimens are prepared IN738 with thermal barrier coating (TBC) and IN738 with thermal coating and based glass-ceramic bond coat as a topcoat with 25% CeO2 doped in it. The specimen with topcoat shows better results than the other regarding corrosion test, mechanical test, and microstructural study