Improvement on corrosion resistance of molten calcium-magnesium-alumina-silicate (CMAS) by Yb2O3-Y2O3 co-stabilized ZrO2 ceramic pellets

Five types of ceramic pellets with different doping contents of Yb2O3-Y2O3 co-stabilized ZrO2 (YbYSZ) (x mol.% Yb2O3 - (4.5-x) mol.% Y2O3-ZrO2; X = 0 (YSZ), 1, 2, 3, 4) were designed to investigate corrosion behavior under CMAS attack. The results show that the corrosion resistance of YbYSZ increased with increasing Yb2O3 content, which was attributed to the excellent phase stability and lower diffusion of Yb3+. More degradation with microstructural destruction was observed in the YSZ pellets, and less degradation was observed in YbYSZ with 4 mol.% Yb2O3 (YbYSZ-4). Further, YbYSZ-4 performs a larger contact angle than others, promoting CMAS resistance.