Abstract
The pore characteristics of air plasma sprayed yttria-stabilized zirconia thermal barrier coatings (TBCs) were tailored by Al2O3-sol impregnation, and then its influence on CMAS attack behavior was investigated. Cross-sectional inspection revealed that the pore-modifier Al2O3 can reduce the width of the infiltration path, increase tortuosity, or even block the path by forming connection arrays along with the path. CMAS attack test showed that the pore-tailored TBCs had a better CMAS infiltration resistance. This study implies that tailoring the pore characteristics of TBCs by impregnation may be a potential way to mitigate CMAS damage.
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