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 Yb 2 O 3 -Y 2 O 3 co-stabilized ZrO 2 (YbYSZ) (x mol.% Yb 2 O 3 - (4.5-x) mol.% Y 2 O 3 -ZrO 2 ; 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 Yb 2 O 3 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.% Yb 2 O 3 (YbYSZ-4). Further, YbYSZ-4 performs a larger contact angle than others, promoting CMAS resistance. • Five types of ceramic pellets with different doping contents of Yb 2 O 3 are designed to study the CMAS corrosion behavior. • As the increase of Yb 2 O 3 content, the resistance of YbYSZ ceramic pellets to CMAS corrosion increases. • YbYSZ with 4.0 mol.% Yb 2 O 3 powder has the lowest diffusion rate in a CMAS pool at 1300 ℃ × 2 h. • The smaller surface energy of YbYSZ can result in poor wetting performance of YbYSZ with 4.0 mol. % Yb 2 O 3. [ABSTRACT FROM AUTHOR]