Abstract
Calcia-magnesia-alumino-silicate (CMAS)-attack mitigation mechanisms of 2ZrO2·Y2O3 composition TBCs are investigated through a ‘model’ study where 2ZrO2·Y2O3 ceramic powders are immersed in molten CMAS glass for various durations at 1300°C. The key insight gained from this study is that the formation of the CMAS-blocking apatite phase requires high concentration of Y3+ within a confined volume of CMAS, whereas the presence of a large-volume CMAS sink for Y3+ precludes the formation of apatite. It is also demonstrated that the ceramic microstructure has a profound effect on its dissolution and penetration by CMAS, and on the concomitant crystallization of apatite.
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