Improvement on Corrosion Resistance of Molten Calcium-Magnesium-Alumina-Silicate (Cmas) by Yb2o3-Y2o3 Co-Stabilized Zro2 Ceramic Pellets

Abstract

Five kinds 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) are designed to investigate the corrosion behavior under CMAS attack. Results show that the corrosion resistance of YbYSZ increases with the increase of Yb2O3 content, which contributes to the excellent phase stability and lower diffusion of Yb3+. More degradation with microstructural destruction was observed in YSZ pellets and less in YbYSZ with 4 mol.% Yb2O3 (YbYSZ-4). Meanwhile, YbYSZ4 performs a larger contact angle than others, promoting CMAS resistance.

Keywords: Thermal barrier coatings (TBCs), Calcium-magnesium-alumina-silicate (CMAS), Corrosion resistance, Rare earth doping, Contact angle