The Current Status of Environmental Barrier Coatings and Future Direction of Thermal Spray Process

In the next-generation of turbine engines, improving heat resistance and reducing weight are essential solutions to increasing thermal efficiency fuel consumption CO2 emissions. Silicon-based ceramics (e.g., SiCf/SiC matrix composites (CMCs) monolithic Si3N4) leading candidates for these applications because their extreme light superior compared current Ni-based alloys. The main challenge Si-based is oxidation volatilization silica in high-temperature combustion gas environment with water vapor thereby its rapid recession. most promising approach protecting surface ceramic from attack by an external environmental barrier coating (EBC) layer. Since early 1990s, a lot efforts have been made develop suitable EBCs; however, no single material can satisfy all EBC requirements. Thereby, trends directed development multilayered EBCs, different functions as significant solution prevent CMC recession maximize performance next engine generation. This paper discusses history, status, future not only world but also Japan. Furthermore, it introduces prospects fine particle spraying developments.