Abstract
Thermal barrier coatings (TBC) have structures which are very complex and are employed in high temperature condition. The phenomenon of cracking is usually noticed at both the Top Coat (TC) and the interface between the bond coat and the thermally grown oxide layer under the Thermal Cyclic Fatigue (TCF) loading. In this study, the cracking behavior in Bond Coat (BC) and interface for TBC were thoroughly determined by using the commercially available ABAQUS/CAE 6.14-3 FEA software. This study also analyzed the key aspects causing the cracking behaviors in TBC. Various crack propagation path in the Bond Coat (BC) could be obtained on changing the thermal wave forms. The beginning location of TC (Top Coat) was independent of the roughness in the interface. The thermally grown oxide layer (TGO) which is thinner at the beginning could increase the service life of TBC. From the results it is evident that in order to characterize the service environment, the thermal fatigue load and the working temperatures have to be designed
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