Ti3AlC2-modified NiCrAlY as a metallic bond coat for thermal barrier coatings: a study on high-temperature oxidation resistance

Abstract

Abstract Thermal barrier coatings (TBCs) are employed in high-temperature gas turbines to reduce the surface temperature of metallic components such as turbine blades. In order to enhance the operational performance of conventional TBCs under high-temperature and high-pressure conditions, this study designs and prepares a novel TBC with YSZ as the ceramic layer and NiCrAlY as the bond coat. Different amounts of Ti3AlC2 particles (5wt%, 10wt%, and 15wt%) are added to the bond coat. The microstructure and organization of the coatings are characterized by using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The resistance to high-temperature oxidation of the coatings is evaluated through atmospheric muffle furnace testing. When the Ti3AlC2 content is 5wt%, the coating exhibits less weight gain than traditional TBCs after oxidation at 950°C for 80 hours. Compared to coatings with Ti3AlC2 content of 10wt% and 15wt%, the coating with 5wt% Ti3AlC2 achieves the optimal resistance to high-temperature oxidation.