Research Progress Of High Temperature Failure Of Plasma Sprayed Environmental Barrier Coatings

Environmental barrier coatings (EBCs) have attracted much attention due to its excellent resistance to high temperature water and oxygen corrosion. However, due to the surface coating corroded by external sand particles, commercial EBCs can not meet the requirements of the hot-section components of the aircraft in the future. CMAS corrosion is another challenge to EBCs. Nowadays, EBCs are mostly prepared by plasma spraying. As the coatings were endured with thermal shock conditions, failure will inevitably occur. In response to this fact, the types of failures and failure modes were summarized, and the process of generation and development of EBCs were also introduced. In this paper, the selection of EBCs was introduced from micro, mesoscopic and macroscopic scale. By analyzing the experimental investigation results of EBCs at home and abroad, combining with modeling and simulation results, the failure mechanism of EBCs induced by CMAS erosion, high temperature water vapor and thermal shock was summarized. Finally, the problems that still need to be solved for the EBCs application and the research trends in the future were also pointed out.