Preparation and characteristics of three-layer YSZ-(YSZ/Al2O3)-YSZ TBCs

▶ Three-layer YSZ-(YSZ/Al2O3)-YSZ TBCs were fabricated by using composite sol-gel slurries and pressure filtration microwave sintering processes. ▶ The oxidation resistance can be improved by designing the structure of YSZ/Al2O3 composite layer due to its sealing effect. ▶ The thermal stresses can be reduced by the impeded propagation of cracks at layer/layer interfaces and thermal expansion match. ▶ This three-layer ceramic coating can be further study to meet the desirable criterion for an application as a new kind of TBC.