丁坤英,李志远,王璐璐,董仲伸.大气等离子喷涂YSZ 涂层中CMAS 渗透行为分析[J].表面技术,2022,51(10):370-379.
DING Kun-ying,LI Zhi-yuan,WANG Lu-lu,DONG Zhong-shen.Analysis of CMAS Permeation Behavior in Atmospheric Plasma Sprayed YSZ Coatings[J].Surface Technology,2022,51(10):370-379 |
| 大气等离子喷涂YSZ 涂层中CMAS 渗透行为分析 |
| Analysis of CMAS Permeation Behavior in Atmospheric Plasma Sprayed YSZ Coatings |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.10.040 |
| 中文关键词: 大气等离子喷涂 热障涂层 CMAS 渗透行为 微观结构 孔隙直径 |
| 英文关键词:atmospheric plasma spraying thermal barrier coating CMAS penetration micro structure pore diameter |
| 基金项目:中央高校基本科研业务费重点项目（3122019189） |
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| Author | Institution |
| DING Kun-ying | Tianjin Key Laboratory for Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China,Tianjin 300300, China |
| LI Zhi-yuan | Tianjin Key Laboratory for Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China,Tianjin 300300, China |
| WANG Lu-lu | China Southern Technic, Shenyang 110100, China |
| DONG Zhong-shen | China Southern Technic, Shenyang 110100, China |
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| 中文摘要: |
| 目的 建立大气等离子制备的热障涂层的结构特征与高温环境中CMAS渗透速率之间的定量关系，分析微裂纹、孔洞等缺陷对渗透行为的影响。方法 利用大气等离子喷涂方法制备ZrO2-8％Y2O3（YSZ）涂层。用摩尔比为45SiO2︰33CaO︰13AlO1.5︰9MgO的CMAS涂覆涂层表面，在1 200 ℃条件下进行CMAS渗透试验。通过SEM、EDS、XRD对涂层微观结构和物相进行测试，并通过图像分析处理软件计算涂层的孔隙率，分析孔径的分布规律。测量CMAS渗透速率，分析涂层结构对渗透速率的影响，改进CMAS理论渗透速率计算方法。结果 熔融态的CMAS能够快速渗透涂层，使得涂层的孔隙率由12.8%降至4%。YSZ涂层中直径大于3 μm的孔隙不易被填充。把有效孔隙率引入到CMAS渗透速率的计算中，可以将计算结果与实测结果之间的偏差降至5%以内。CMAS渗透后30 min内，YSZ未发生明显的相变，40 min后发现涂层出现腐蚀现象。结论 大气等离子喷涂YSZ涂层中微裂纹的直径尺寸影响CMAS渗透速率，而曲折程度对渗透速率的影响较小。直径较小的裂纹能够加速渗透，直径较大的孔洞可以阻碍CMAS的渗透。由于大气等离子喷涂YSZ中存在大量直径较小的微裂纹，使得高温环境中CMAS能够在较短时间内渗透YSZ涂层，使涂层出现致密化。 |
| 英文摘要: |
| This work is designed to research the quantitative relationship between the structural characteristics of atmospheric plasma spraying thermal barrier coatings (APS-TBCs) and the CMAS penetration rate in a high temperature environment. The influence of microcracks, holes, and other defects on the penetration behavior was analyzed. The ZrO2-8% Y2O3 (YSZ) coating was prepared by the atmospheric plasma spraying method. The surface of the coating was deposited by CMAS with the molar ratio of 45SiO2∶33CaO∶13AlO1.5∶9MgO. The CMAS penetration test was implemented at 1 200 ℃ with different exposed time. Scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), and x-ray powder diffractometer (XRD) were employed to analyse the microstructure and phase of the coating. The image method and processing software were used to analyse the porosity and pore size distribution of the coating. The penetration rate of CMAS related to coating structure was measured. The molten CMAS can penetrate the coating quickly, and the pores of the coating were filled to a large extent. The penetration depth of the CMAS increases with the penetration time increasing. In this case, CMAS penetrated about 200 μm within 30 s. The porosity of the coating decreased from 12.8% to 4% when the CMAS penetration time was 5 minutes. The porosity of the coating was 3.8%, when the CMAS penetration time was 10 minutes. The filling behavior of CMAS in the pores will not change with an increase over time. CMAS had good penetration behavior once pores with an equivalent diameter of less than 3 μm, and exhibited the opposite trend once pores equivalent diameter was greater than 3 μm. The effective porosity with an equivalent diameter of less than 3 μm introduced into the calculation of the CMAS penetration rate decreases the deviation between the calculated results and the measured results from 13% to less than 5%. The YSZ coating did not undergo significant phase change until 30 minutes after CMAS penetration began. The YSZ coating has a large number of micropores and the cracks were also observed when the CMAS penetration time sustained for 1 h. The area around the cracks in the coating was corroded soseverely that it accelerated crack propagation. The phase transition degree of YSZ coating and powdered coating degradation area increases with the increase of CMAS penetration time. The diameter of the microcracks included in the atmospheric plasma sprayed YSZ coating has significantly influenced the penetration rate of CMAS, but the degree of tortuosity has not. The cracks with smaller diameters accelerate penetration rates, but those with larger diameters have the opposite effect. Atmospheric plasma sprayed YSZ contains a large number of microcracks with small diameters that cause structure to be identified in a short period of time after CMAS penetration. In addition, long-term CMAS penetration will cause large-scale corrosion pits in the YSZ coating. It is also found that penetration of CMAS is a gradient decay process, and the corrosion degree decreases sequentially from the top to the bottom of the coating. The expansion of microcracks caused by CMAS corrosion can greatly promote the spalling failure of the coating. |
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