Wetting and spreading behaviour of molten CMAS towards thermal barrier coatings and its influencing factors
Wetting and spreading behaviour of molten CMAS towards thermal barrier coatings and its influencing factors
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DOI：
10.1016/j.rinp.2021.104365
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发表时间：
2021-07
影响因子：
5.3
通讯作者：
Bingbing Yin;Miao Sun;Zhuo Wang;Yang Li;Yichun Zhou
中科院分区：
文献类型：
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作者：
Bingbing Yin;Miao Sun;Zhuo Wang;Yang Li;Yichun Zhou
热障涂层不可避免地会受到钙镁铝硅酸盐（CMAS）熔液的腐蚀，导致涂层性能严重下降。本研究开发了一种新型的熔融CMAS润湿性能评估装置，解决了高温下CMAS在tbc上接触角测量的难题。研究了不同条件下CMAS的润湿和铺展行为，系统分析了温度、表面粗糙度、涂层制备工艺等因素对其润湿行为的影响。结果表明：在粗糙表面上，接触角增大，接触距离减小，且稳定阶段接触角与粗糙度的平方成正比；润湿性也由粘度决定，而粘度又由温度和CMAS和涂层的反应产物决定。
Thermal barrier coatings (TBCs) are inevitably subject to corrosion caused by molten calcium-magnesium-alumino-silicate (CMAS), which leads to severe degradation in the properties of the coatings. In this study, a novel device for evaluating the wetting performance of molten CMAS was developed, which solved the challenging problem of measuring the contact angle of CMAS on TBCs at high temperatures. The wetting and spreading behaviour of CMAS under various conditions was studied, and the effect of various factors such as temperature, surface roughness, and the coating preparation process on the wetting behaviour was systematically analysed using this new method. The results demonstrate that the spreading distance can decrease and the contact angle can increase on rough surfaces, and the contact angle is proportional to the square of the roughness at the stable stage. The wettability is also determined by the viscosity, which in turn is governed by the temperature and the reactive production of CMAS and the coatings.