7YSZ coating prepared by PS-PVD based on heterogeneous nucleation |
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Authors: | Ziqian DENG Xiaofeng ZHANG Kesong ZHOU Min LIU Chunming DENG Jie MAO Zhikun CHEN |
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Institution: | 1. School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China;2. National Engineering Laboratory for Modern Materials Surface Engineering Technology & the Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou 510650, China;3. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China |
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Abstract: | Plasma spray-physical vapor deposition (PS-PVD) as a novel coating process based on low-pressure plasma spray (LPPS) has been significantly used for thermal barrier coatings (TBCs). A coating can be deposited from liquid splats, nano-sized clusters, and the vapor phase forming different structured coatings, which shows obvious advantages in contrast to conventional technologies like atmospheric plasma spray (APS) and electron beam-physical vapor deposition (EB-PVD). In addition, it can be used to produce thin, dense, and porous ceramic coatings for special applications because of its special characteristics, such as high power, very low pressure, etc. These provide new opportunities to obtain different advanced microstructures, thus to meet the growing requirements of modern functional coatings. In this work, focusing on exploiting the potential of gas-phase deposition from PS-PVD, a series of 7YSZ coating experiments with various process conditions was performed in order to better understand the deposition process in PS-PVD, where coatings were deposited on different substrates including graphite and zirconia. Meanwhile, various substrate temperatures were investigated for the same substrate. As a result, a deposition mechanism of heterogeneous nucleation has been presented showing that surface energy is an important influencing factor for coating structures. Besides, undercooling of the interface between substrate and vapor phase plays an important role in coating structures. |
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Keywords: | 7YSZ Deposition mechanism Heterogeneous nucleation PS-PVD TBC |
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