文献类型：期刊文献

中文题名：热障涂层微-纳分级微观结构制备及其抗CMAS润湿性能

英文题名：Preparation of Micro-Nano Hierarchical Microstructure of Thermal Barrier Coatings and Its Performance against CMAS Wetting

作者：方焕杰[1];王卫泽[1];俞泽新[2]

机构：[1]华东理工大学机械与动力工程学院,承压与安全教育部重点实验室,上海200237;[2]苏州大学机电工程学院,江苏苏州215137

年份：2023

卷号：49

期号：4

起止页码：598

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：Scopus;北大核心:【北大核心2020】；CSCD:【CSCD_E2023_2024】；

基金：国家自然科学基金(52175136)。

语种：中文

中文关键词：热障涂层;CMAS腐蚀;抗润湿性能;悬浮液等离子喷涂;微-纳分级微观结构

外文关键词：thermal barrier coatings;CMAS corrosion;anti-wettability;suspension plasma spraying;micro-nano hierarchical microstructure

摘要：通过悬浮液等离子喷涂技术(SPS)在常规大气等离子(APS)热障涂层表面构建了具有微-纳双尺度的表面微观结构,比较了高温下熔融CMAS(Calcium-Magnesium-Alumina-Silicate)在两种涂层表面上的润湿行为差异,从实验和理论角度分析了表面微观结构差异对涂层抗CMAS润湿性能的影响。研究结果显示,得益于涂层表面微-纳分级微观结构,SPS涂层的抗CMAS润湿性能较常规APS涂层的抗CMAS润湿性能得到了显著提升。在1300℃下热处理5 min后,熔滴在SPS涂层上的润湿角为115.1°,而熔融CMAS在常规APS涂层的润湿角为52.1°;热处理10 min后,熔融CMAS在SPS涂层上的润湿角为68.2°,是常规APS涂层上润湿角的3.2倍。此外,SPS涂层疏松多孔的微观结构特征有利于空气的储存,在熔体润湿涂层表面过程中可起到支撑液滴的作用。
The application of thermal barrier coatings(TBCs)is greatly limited by calcium-magnesium-alumina-silicate(CMAS)attack.The surface microstructure of TBCs is demonstrated its fundamental effect on the wetting behavior of molten CMAS,thus further influencing CMAS resistance of TBCs.In this study,hierarchical microstructure was innovatively fabricated by suspension plasma spray technology(SPS)on air plasma spraying(APS)coating surface,where cauliflower-like microstructures formed by the stacking of numerous micron and nanometer particles were densely distributed.And the wetting behavior of the melt on the coating surface was investigated and compared.Results indicated that SPS coatings showed a superior excellence of repelling the molten CMAS wetting compared with conventional APS coating,resulting from its micro-nano surface microstructure.After kept at 1300 oC for 5 min,the contact angle of melt on SPS coating was 115.1°,which was more than twice that on APS coating(52.1°),and that on SPS coating was 3.2 times larger than that on APS coating after 10 min.The effectiveness of SPS coating in repelling the melt was illustrated by theoretical analysis to be attributed to its micro-nano multi-scale microstructure.Also,air stored in the porous microstructure of SPS coating played a vital role in lifting CMAS droplet during the wetting process.