Transient wetting and corrosion behavior of CMAS and CMAS-NaCl on 7YSZ and AlO-YSZ TBCs were investigated at 1250 ℃. NaCl addition decreased the melting point and viscosity of CMAS while improving the dynamic wettability during melt spreading. This intensified melt interactions with TBCs, facilitating CMAS infiltration and coating degradation. The AlO addition to coatings promoted interfacial reactions between glassy melts and TBCs, generating anorthite products. Such reactive wetting decreased spreading velocity and increased contact angles of glassy melts at early interaction stages, but the densely stacked anorthite layer mitigated CMAS and CMAS-NaCl attacks for a longer duration of 10 h.

中文翻译：

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CMAS 和 CMAS-NaCl 对等离子喷涂 YSZ 和 Al2O3-YSZ 热障涂层的润湿动力学和腐蚀

研究了 CMAS 和 CMAS-NaCl 在 7YSZ 和 AlO-YSZ TBC 上在 1250 ℃ 下的瞬态润湿和腐蚀行为。氯化钠的添加降低了 CMAS 的熔点和粘度，同时提高了熔体铺展过程中的动态润湿性。这增强了熔体与热障涂层的相互作用，促进了 CMAS 渗透和涂层降解。涂层中添加 Al2O3 促进了玻璃熔体和 TBC 之间的界面反应，生成钙长石产品。这种反应性润湿降低了玻璃态熔体在早期相互作用阶段的铺展速度并增加了接触角，但密集堆积的钙长石层在更长的10小时内减轻了CMAS和CMAS-NaCl的攻击。