Corrosion of RE2Si2O7 (RE=Y, Yb, and Lu) environmental barrier coating materials by molten calcium-magnesium-alumino-silicate glass at high temperatures
作者： Zhilin Tian , Xiaomin Ren , Yiming Lei , Liya Zheng , Wanrong Geng
DOI: 10.1016/J.JEURCERAMSOC.2019.05.036
关键词:
摘要: Abstract With the increased demand for high operating temperature of gas turbine engines, corrosion by molten calcium-magnesium-alumino-silicate (CMAS) exhibits a significant challenge to development durable environmental barrier coatings (EBCs). EBC candidates, γ-Y2Si2O7, β-Yb2Si2O7, and β-Lu2Si2O7 were explored on their resistance CMAS melts at 1300 °C 1500 °C 50 h. Interaction degradation mechanisms investigated behaviors showed different trends temperatures. At 1300 °C, RE2Si2O7 dissolves into apatite phases reprecipitate forming thick recession layer. However, when increases 1500 °C, vigorously penetrate through grain boundary ‘blister’ cracks form throughout samples. The reduced stability promotes penetration in RE2Si2O7. Grain engineering is critically demanded optimize
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