Abstract
In order to understand the degradation of thermal barrier coating (TBC) systems better, we determined the adhesion energy ( G c) between the bond coat and the top coat and its evolution during cyclic oxidation. This energy was evaluated by means of a modified four-point bending test. The systems tested consist of a YPSZ (7 wt.%Y 2O 3–ZrO 2) EB-PVD ceramic top coat deposited on a single-crystal AM1 superalloy substrate protected with either a β-(Ni, Pt)Al bond coat or a newly developed Zr-doped β-NiAl bond coat. Although the results show a similar adhesion evolution for both systems, different microstructural degradations are involved.
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