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4673 |
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Thursday, May 12, 2016, Yellow River Hall 10:20 AM Power Generation II |
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Thermal cycling behavior of quasi-columnar YSZ coatings deposited by PS-PVD |
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Shunyan Tao* / Shanghai Institute of Ceramics
Chinese Academy of Sciences, China Fang Shao / Shanghai Institute of Ceramics, Chinese Academy of Sciences, China Huayu Zhao/ Shanghai Institute of Ceramics, Chinese Academy of Sciences, China Chengguang Liu/ Shanghai Institute of Ceramics, Chinese Academy of Sciences, China Yin Zhuang/ Shanghai Institute of Ceramics, Chinese Academy of Sciences, China Jinxing Ni/ Shanghai Institute of Ceramics, Chinese Academy of Sciences, China Xinghua Zhong/ Shanghai Institute of Ceramics, Chinese Academy of Sciences, China |
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Columnar structured thermal barrier coatings, owing to their high strain tolerance, are expected for their potential possibilities to substantially extend turbine lives and improve engine efficiencies. In this paper, plasma spray - physical vapor deposition (PS-PVD) process was used to deposit yttria partially stabilized zirconia (YSZ) coatings with quasi-columnar structures. Thermal cyclic tests on burner rigs and thermal shock tests by heating and water quenching method were involved to evaluate the thermal cycling and thermal shock behaviors of such kind of structured TBCs. Evolution of the microstructures, phase composition and failure behaviors of quasi-columnar YSZ coatings before and after the thermal tests were investigated. The quasi-columnar coating obtained before process optimization also had an average life of around 400 cycles as the spallation area reached about 10% of the total coating surface during burner rig tests with a coating surface temperature of ~ 1250. Failure of the coating is mainly due to the center columnar segments pull-out spallation. KEYWORDS: Plasma spray - physical vapor deposition (PS-PVD); Quasi-columnar structure; Thermal barrier coating; Thermal cyclic test; Thermal shock test |