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 Yb 2 O 3 -Al 2 O 3 -SiO 2 (YbAS) glass-ceramics and their resistance to corrosion by molten calcium magnesium aluminosilicate (CMAS) at 1350 degrees C were systematically investigated. YbAS glassceramics, characterized by diverse compositions, maintaining phase stability over extended durations at elevated temperatures. After CMAS corrosion for 50 h, the main reaction phases were CaAl 2 Si 2 O 8 and Ca 2 Yb 8 (SiO 4 ) 6 O 2 , accompanied by multiple ion solid solution garnet in certain components. The glass component positioned along the eutectic line of Yb 2 Si 2 O 7 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).