Wetting,infiltration and interaction behavior of CMAS towards columnar YSZ coatings deposited by plasma spray physical vapor |
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| Authors: | Baopeng Zhang Wenjia Song Hongbo Guo |
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| Affiliation: | 1. School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Beijing 100191, China;2. Key Laboratory of High-Temperature Structure Materials and Protective Coatings (Ministry of Industry and Information Technology), Beihang University, No. 37 Xueyuan Road, Beijing 100191, China;3. Department of Earth and Environmental Sciences, Ludwig-Maximilians-Universitat Munich, Munich 80333, Germany |
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| Abstract: | Thermal barrier coatings (TBCs) produced by electron beam physical vapor deposition (EB-PVD) or plasma spray (PS) usually suffer from molten calcium-magnesium-alumino-silicate (CMAS) attack. In this study, columnar structured YSZ coatings were fabricated by plasma spray physical vapor deposition (PS-PVD). The coatings were CMAS-infiltrated at 1250?°C for short terms (1, 5, 30?min). The wetting and spreading dynamics of CMAS melt on the coating surface was in-situ investigated using a heating microscope. The results indicate that the spreading evolution of CMAS melt can be described in terms of two stages with varied time intervals and spreading velocities. Besides, the PS-PVD columnar coating (～100?μm thick) was fully penetrated by CMAS melt within 1?min. After the CMAS attack for 30?min, the original feathered-YSZ grains (tetragonal phase) in both PS-PVD and EB-PVD coatings were replaced by globular shaped monoclinic ZrO2 grains in the interaction regions. |
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| Keywords: | CMAS Wetting Thermal barrier coatings YSZ PS-PVD |
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