| 摘要: |
| 随航空发动机涡轮端进口温度提高，硅酸盐环境沉积物(CMAS)成为高温部件热障涂层(TBCs)失效的重要威胁。 研究热障涂层与 CMAS 的作用关系，可为提高热障涂层的服役寿命提供基础。目前表面粗糙度(Ra)对高温熔体润湿性能的影响并未形成明确统一的定论，针对 TBCs / CMAS 体系润湿性的研究较少。采用座滴法研究 1 300 ℃条件下氧化钇部分稳定氧化锆(YSZ)涂层 Ra 对熔融 CMAS 润湿行为和渗透行为的影响。结果表明，在研究的涂层表面粗糙度的范围内，随着 Ra 的减小，熔融 CMAS 的润湿半径减小，接触角增大，渗透深度减小。由此推断粗糙表面有利于涂层抗润湿性能的增强。 粗糙涂层表面为熔融 CMAS 铺展提供驱动力，促进三相线的移动；同时，粗糙涂层表面具有更大的实际接触面积以及更多的渗透方向，为 CMAS 渗透提供了有利条件。研究结果可为进一步开发表面不浸润的抗 CMAS 腐蚀热障涂层提供理论和实践依据。 |
| 关键词: 热障涂层 硅酸盐环境沉积物(CMAS) 粗糙度 润湿行为 渗透行为 |
| DOI：10.11933/j.issn.1007?9289.20220218002 |
| 分类号:TG174 |
| 基金项目:国家自然科学基金(52175136)、航空发动机及燃气轮机基础科学中心(P2021-A-IV-002-002)和上海市教委商发联合创新计划资助项目 |
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| Wetting Behavior of Molten CMAS on the Surface of Thermal Barrier Coatings with Different Roughness |
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WANG Yihao, WANG Weize, FANG Huanjie, YANG Ting, YUAN Baohan
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College of Mechanical and Power Engineering, East China University of Science and Technology,Shanghai 200237 , China
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| Abstract: |
| With the increase of inlet temperature of turbine in aero-engine, silicate environmental sediment (CMAS) becomes a significant threat to the failure of thermal barrier coatings (TBCs) on high-temperature components. The study of the interaction between TBCs and CMAS can provide a basis for improving the service life of TBCs. At present, the effect of surface roughness (Ra) on the wettability of high-temperature melts has not formed a clear and uniform conclusion, and there are few studies on the wettability of TBCs / CMAS systems. The effect of surface roughness of yttrium oxide partially stabilized zirconia (YSZ) coating on the wetting behavior and infiltration behavior of molten CMAS at 1 300 ℃ is studied by the site-drop method. The results show that with the decrease of Ra, the wetting radius of molten CMAS decreases, the contact Angle increases and the infiltration depth decreases. It is thus considered that rough surface is conducive to the enhancement of the non-wettability. Rough surface provides driving force for the spreading of molten CMAS and promotes the movement of three-phase lines. At the same time, rough surface has a larger actual contact area and more infiltration directions, which provides favorable conditions for CMAS infiltration. The results provide a theoretical and practical basis for further development of CMAS corrosion resistant thermal barrier coatings with non-wetting surface. |
| Key words: thermal barrier coatings (TBC) calcium-magnesium-alumina-silicate (CMAS) roughness wetting behavior infiltration behavior |
