Influence of phase composition on microstructure and thermal properties of ytterbium silicate coatings deposited by atmospheric plasma spray |
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| Authors: | Tao Zhu Yaran Niu Xin Zhong Jun Zhao Yi Zeng Xuebin Zheng Chuanxian Ding |
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| Affiliation: | 1. Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Structural Ceramics and Composites Engineering Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China |
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| Abstract: | 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 Yb2Si2O7 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. |
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| Keywords: | Rare-earth silicates Environmental barrier coatings Atmospheric plasma spray Microstructure Thermal properties |
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