CMAS Corrosion Resistance of Y₃Al₅O₁₂/Al₂O₃ Ceramic Coating Deposited by Atmospheric Plasma Spraying

The investigation of novel materials exhibiting exceptional resistance to calcium magnesium aluminum silicate (CMAS) corrosion at temperatures exceeding 1300 ℃ has emerged as a pivotal objective in the advancement of environmental barrier coatings for aircraft engines in recent years.In this study, atmospheric plasma spraying (APS) technology was employed to fabricate YAG(Y3Al5O12)/Al2O3 coatings with eutectic composition, which was acknowledged as a promising material possessing outstanding CMAS corrosion resistance, thereby rendering it suitable for application in environmental barrier coatings.The asdeposited coatings were annealed at 1100 ℃, 1300 ℃, and 1500 ℃ to obtain different microstructures and the corrosion resistance as well as mechanism of YAG/Al2O3 coatings against CMAS were investigated by comparing the corrosion results after exposure to CMAS at 1300 ℃ for durations of 1, 4, and 25 h.The reaction products between YAG/Al2O3 coatings and CMAS were found to be garnet-structure solid solution, CaAl2Si2O8, and Ca2MgSi2O7.The nearly continuous distribution of the garnetstructure solid solution layer at the reaction interface between YAG/Al2O3 coating annealed at 1100 ℃ and CMAS effectively impedes the diffusion of CMAS corrosion elements.For coatings annealed at 1500 ℃, the increase in grain size and decrease in 收稿日期：2024-01-02；收到修改稿日期：2024-02-29；网上出版日期：xxxx-xx