Abstract In the present work, the wetting behavior of molten calcium-magnesium-aluminum-silicate (CMAS) on femtosecond laser ablated YSZ coatings is comparatively studied. The results suggest that femtosecond laser ablated coating possesses smaller initial contact angle compared with as-sprayed or polished YSZ coatings, but lower spreading rate and larger equilibrium contact angle. This difference can be attributed to: 1) restricted CMAS spreading by the ablated squares through pinning the solid-liquid-vapor triple-phase contact line; 2) retarded CMAS penetration by microrod-shaped structure inside the ablated squares. This study provides an effective method to improve the CMAS resistance of YSZ coating by femtosecond laser.

中文翻译：

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具有定制表面微结构的 CMAS 和 YSZ 涂层之间的高温润湿性

摘要 在目前的工作中，比较研究了熔融钙镁铝硅酸盐 (CMAS) 对飞秒激光烧蚀 YSZ 涂层的润湿行为。结果表明，飞秒激光烧蚀涂层与喷涂或抛光 YSZ 涂层相比具有较小的初始接触角，但扩散速率较低，平衡接触角较大。这种差异可归因于：1）通过固定固-液-汽三相接触线，烧蚀方块限制了 CMAS 的扩散；2) 烧蚀方块内的微棒状结构延迟了 CMAS 的穿透。该研究为飞秒激光提高YSZ涂层的CMAS电阻提供了一种有效的方法。