Influence of phase composition on microstructure and thermal properties of ytterbium silicate coatings deposited by atmospheric plasma spray

被引：27
作者：
Zhu, Tao [1 ,2 ]
Niu, Yaran [1 ]
Zhong, Xin [1 ]
Zhao, Jun [1 ]
Zeng, Yi [3 ]
Zheng, Xuebin [1 ]
Ding, Chuanxian [1 ]
机构：
[1] Chinese Acad Sci, Shanghai Inst Ceram, Key Lab Inorgan Coating Mat CAS, Shanghai 200050, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Chinese Acad Sci, Shanghai Inst Ceram, Struct Ceram & Composites Engn Res Ctr, Shanghai 200050, Peoples R China
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2018年 / 38卷 / 11期
关键词：
Rare-earth silicates; Environmental barrier coatings; Atmospheric plasma spray; Microstructure; Thermal properties; ENVIRONMENTAL BARRIER COATINGS; THERMOMECHANICAL PROPERTIES; MECHANICAL-PROPERTIES; SIC/SIC COMPOSITES; BEHAVIOR; OXIDATION; MULLITE; TEMPERATURE; PERFORMANCE; DURABILITY;
D O I：
10.1016/j.jeurceramsoc.2018.04.047
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In this study, ytterbium silicate coatings with different compositions were designed by controlling the Yb2O3/SiO2 ratio and fabricated by atmospheric plasma spray. The microstructure and thermal properties of these coatings were characterized. Results showed that the Yb2O3-rich coatings contained Yb2O3 and Yb2SiO5 phases, which were characterized by Yb2O3 columnar grains, obvious interfaces between splats and many microcracks. The SiO2-rich coatings were composed of Yb2SiO5 and Yb2Si2O2 phases, which were composed of well bonded splats with many spherical pores. The Yb2O3-rich coatings had higher coefficient of thermal expansion values and lower thermal conductivities than the SiO2-rich coatings. The SiO2-rich coatings presented much better thermal cycling resistance than the Yb2O3-rich coatings. The relationship among phase composition, microstructure and thermal properties of ytterbium silicate coatings was analyzed. The results of this study may provide some clues for designs and applications of rare-earth silicates as environmental barrier coatings.
引用
收藏
页码：3974 / 3985
页数：12
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