7YSZ coating prepared by PS-PVD based on heterogeneous nucleation

被引:22
|
作者
Deng, Ziqian [1 ,2 ,3 ]
Zhang, Xiaofeng [2 ,3 ,4 ]
Zhou, Kesong [2 ,3 ,4 ]
Liu, Min [1 ,2 ,3 ]
Deng, Chunming [2 ,3 ]
Mao, Jie [2 ,3 ]
Chen, Zhikun [2 ,3 ]
机构
[1] Guangdong Univ Technol, Sch Mat & Energy, Guangzhou 510006, Guangdong, Peoples R China
[2] Guangdong Inst New Mat, Natl Engn Lab Modern Mat Surface Engn Technol, Guangzhou 510650, Guangdong, Peoples R China
[3] Guangdong Inst New Mat, Key Lab Guangdong Modern Surface Engn Technol, Guangzhou 510650, Guangdong, Peoples R China
[4] South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China
基金
中国国家自然科学基金;
关键词
7YSZ; Deposition mechanism; Heterogeneous nucleation; PS-PVD; TBC; PLASMA; DEPOSITION; MICROSTRUCTURE;
D O I
10.1016/j.cja.2017.07.007
中图分类号
V [航空、航天];
学科分类号
08 ; 0825 ;
摘要
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 (EBPVD). 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. (C) 2017 Production and hosting by Elsevier Ltd. on behalf of Chinese Society of Aeronautics and Astronautics. This is an open access article under the CC BY-NC-ND license.
引用
收藏
页码:820 / 825
页数:6
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