Abstract
In this study, a novel self-healing method based on pressure sintering was employed for segmented cracks healing, the latter formed in the laser re-melted ZrO2-7wt% Y2O3 thermal barrier coatings (TBCs), by four sealed particles respectively. Full metallurgically bonded sealed films were formed in the segmented gaps for the application of nano-Al2O3+Ni-20wt% Al particles, whereas a partial healing occurred for the other particles. Also, the necessary thermodynamic analysis and formation mechanisms of the sealed films were also investigated. The cyclic oxidation results confirmed that the fully sealed nano-Al2O3 reinforced films had superior anti-oxidation resistance in comparison with the other sealed coatings.
Published Version
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