The influence of interface morphology on the stress distribution in double-ceramic-layer thermal barrier coatings

The influences of the interface morphologies upon the stress distribution in the double-ceramic-layer thermal barrier coating (DCL-TBC) have been mainly studied in our present article using the finite element method. The two important interfaces in the DCL-TBC, which are interface #1 (the interface between two ceramic layers) and interface #2 (the interface between the inside ceramic layer and the bond coat (BC)), are modeled as a sinusoidal wave with considering different values of the amplitude.Results show that the interface #1 has important influence upon the stress of the top ceramic layer. Especially, in the edge of the model, the rougher interface can relief the high stress level of the top ceramic layer caused by the edge stress concentration. Similarly, the influence of the interface #2 upon the stress of different parts of the thermal growth oxide layer has also been studied.