Corrosion resistance and microstructural evolution of Yb-Al-Si-O glass-ceramics under molten Ca-Mg-Al-Si environment at 1350°C

The intrinsic characteristics of Yb2O3-Al2O3-SiO2 (YbAS) glass-ceramics and their resistance to corrosion by molten calcium magnesium aluminosilicate (CMAS) at 1350 °C were systematically investigated. YbAS glass-ceramics, characterized by diverse compositions, maintaining phase stability over extended durations at elevated temperatures. After CMAS corrosion for 50hours, the main reaction phases were CaAl2Si2O8 and Ca2Yb8(SiO4)6O2, accompanied by multiple ion solid solution garnet in certain components. The glass component positioned along the eutectic line of Yb2Si2O7 and mullite, with an OB value marginally exceeding that of CMAS, exhibits superior corrosion resistance to CMAS. This finding offers valuable insights for the subsequent design of environmental barrier coatings (EBCs).