热障涂层微-纳分级微观结构制备及其抗CMAS润湿性能

方焕杰; 王卫泽; 俞泽新

doi:10.14135/j.cnki.1006-3080.20220331001

热障涂层微-纳分级微观结构制备及其抗CMAS润湿性能

doi: 10.14135/j.cnki.1006-3080.20220331001

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

基金项目: 国家自然科学基金(52175136)

详细信息

作者简介:
方焕杰（1995—），男，浙江宁波人，博士生，主要研究方向为热障涂层CMAS腐蚀防护技术研究。E-mail：ecustfhj@163.com

通讯作者:
王卫泽， E-mail：wangwz@ecust.edu.cn

中图分类号: TG174.4
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出版历程
- 收稿日期: 2022-03-31
- 网络出版日期: 2022-08-20

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

FANG Huanjie^1
,,
WANG Weize^{1
, ,},
YU Zexin²

1.
Key Laboratory of Pressure System and Safety, Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China
2.
School of Mechanical and Electrical Engineering, Soochow University, Suzhou 215137, Jiangsu, China

摘要

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，比较在高温下熔融CMAS（Calcium-Magnesium-Aluminum-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于涂层抗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涂层得到了显著提升。在1300 ℃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。该结果为未来抗CMAS腐蚀热障涂层系统的表面微观结构设计提供实践基础。
- 热障涂层 /
- CMAS腐蚀 /
- 抗润湿性能 /
- 悬浮液等离子喷涂 /
- 微-纳分级表面微观结构
Abstract: The application of thermal barrier coatings (TBCs) is greatly limited by calcium-magnesium-aluminum-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 microstructure 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.
- thermal barrier coatings /
- CMAS corrosion /
- anti-wettability /
- suspension plasma spraying /
- micro-nano hierarchical microstructure

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图 1 悬浮液静置不同时间后宏观图片及上清液吸光度变化

Figure 1. Optical image of suspension after standing for various duration and absorbance change of suspension supernatant

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图 2 YSZ粉末在3#悬浮液（a）和5#悬浮液（b）中的粒径分布

Figure 2. Particle size distributions of YSZ powders in sample 3# (a) and sample 5# (b)

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图 3 喷涂态表面APS（a-b）和SPS（c-d）结构特征涂层

Figure 3. Surface characteristic of as-sprayed by APS (a, b) and SPS (c, d) coatings

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图 4 喷涂态涂层的表面三维形貌

Figure 4. Three-dimensional surface morphology of as-sprayed coatings

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图 5 喷涂态APS涂层（a，b）和SPS涂层（c，d）截面典型微观形貌

Figure 5. Typically cross-sectional morphologies of as-sprayed APS coatings (a, b) and SPS coatings (c, d)

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图 6 SPS技术制备涂层沉积机理示意图

Figure 6. Schematic diagram of coating deposition by SPS technology

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图 7 润湿实验后熔融CMAS在APS涂层及SPS涂层上不同热处理时间后的宏观及微观形貌

Figure 7. Macroscopic microscopic morphologies of molten CMAs on APS coatings and SPS coatings after wetting test for various heat treatment time

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图 8 喷涂态涂层的XRD谱图

Figure 8. XRD patterns of as-sprayed APS coatings and SPS coatings

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图 9 微-纳双尺度微观结构抗CMAS润湿示意图

Figure 9. Schematic diagram showing micro-nano microstructure repelling CMAS wetting

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图 10 润湿实验后CMAS/涂层界面处的微观形貌

Figure 10. Microscopic morphologies on CMAS/TBCs interface after wetting test

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表 1 悬浮液配制参数

Table 1. Parameters of suspension

Suspension Dispersant Solvent w(Dispersant)/% Solid mass content/%

1# - Ethanol 5 10
2# PEI Ethanol 5 10
3# PVP Ethanol 5 10
4# PEG Ethanol 5 10
5# PAA-NH₄ Deionized water 5 10

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表 2 3#悬浮液和5#悬浮液的黏度及表面张力

Table 2. Viscosity and surface tension of 3# sample and 5# sample

Suspensions Dispersant Viscosity/mPa·s Surface tension/mN·m⁻¹

3# PVP 2.033±0.023 23.332±0.005
5# PAA-NH₄ 1.165±0.003 67.241±0.019

下载: 导出CSV

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