SiC ceramic matrix composite （SiC/SiC) has excellent high-temperature mechanical properties and thermal stability

and has shown great application potential in hot-end parts of aeroengine. However

SiC ceramic matrix composite would encounter the corrosion in the water vapor environment

therefore

environmental barrier coatings (EBCs） is essential. The bond coat which can enhance the adhesion between the EBCs and the substrate

and reduce the thermal expansion mismatch between the substrate and the coating

plays an important role. This paper reviews the EBCs bond coat

including the Si bond coat and the composite bond coat

and finally prospects the development direction of the EBCs bond coat.