Abstract
The oxidation and interfacial cracking behaviors of thermal barrier coatings (TBCs) with double-layered bond deposited on two typical substrate materials K452 and M247 was comparatively studied. Composition of the substrate can affect the element interdiffusion of the inner bond coat and the driving force of interfacial cracking. The capacity of the inner bond coat to supply Al for the upper bond coat is critical to the lifetime of TBCs with double-layered bond coat. Adopting a substrate with higher resistance to the inward-diffusion of Al can facilitate the formation of the protective Al2O3 scale and significantly extend the lifetime of TBCs.
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