Study of the coating stability of a TBC system

The degradation of thermal barrier coatings is closely linked to their spal ling resistance which depends on the stability of the protective oxide scal e produced by oxidation of the bond-coat. This study deals with a character isation of the oxide layer, its interfaces with the bond-coat and the ceram ic and their evolution during isothermal oxidation at 1,100 degrees C. The microstructural evolution of the bond-coat, the outer part of the superallo y and the ceramic layer was also studied.