Driving forces in thermal barrier coatings blistering

Thermal barrier coating (TBC) systems are known to be extremely sensitive the applied thermo-mechanical loading in terms of both microstructure evolution and subsequent damage, leading final failure by ceramic top-coat layer spallation. The analysis relationship between mechanical behavior is limited scatter experimental results. Based on a typical TBC system for columnar top-coat, this study focuses blister pure thermal cycling. processed LAser Shock Adhesion Test (LASAT) method. It observed experimentally that prior significant further interfacial debonding, height increases with number cycles. To clarify this, finite element was developed account multilayer growth strain associated thermal-grown oxide evolution. Finally, demonstrates rough interfaces, elasto-viscoplastic metallic bond-coat, needed model blister. Thus, driving forces acting bond-coat rumpling, similar increase TBC.