Experimental and numerical investigation on the thermal and mechanical behaviours of thermal barrier coatings exposed to CMAS corrosion

Abstract Calcium-magnesium-alumino-silicate (CMAS) corrosion is a critical factor which causes the failure of thermal barrier coating (TBC). CMAS attack significantly alters temperature and stress fields in TBC, resulting their delamination or spallation. In this work, evolution process TBC prepared by suspension plasma spraying (SPS) under investigated. The leads to formation reaction layer subsequent bending TBC. Based on observations, model proposed describe generation Then, numerical simulations are performed investigate free-standing complete system attack. constructs bridge for connecting two models. results show that has significant influence field, such as peak stress, whereas it little steady-state field. increases with holding time, risk rupture Mises nonlinearly along thick direction layer. Furthermore, traditional zone, interface top coat bond coat, obviously changes during corrosion.