Acta Metall Sin  2012, Vol. 48 Issue (8): 965-970    DOI: 10.3724/SP.J.1037.2011.00758

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THERMAL SHOCK RESISTANCE OF La2(Zr0.7Ce0.3)2O7 THERMAL BARRIER COATING PREPARED BY ATMOSPHERIC PLASMA SPRAYING

XIANG Jianying, CHEN Shuhai, HUANG Jihua, ZHAO Xingke, ZHANG Hua

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083

XIANG Jianying CHEN Shuhai HUANG Jihua ZHAO Xingke ZHANG Hua. THERMAL SHOCK RESISTANCE OF La₂(Zr_0.7Ce_0.3)₂O₇ THERMAL BARRIER COATING PREPARED BY ATMOSPHERIC PLASMA SPRAYING. Acta Metall Sin, 2012, 48(8): 965-970.

Abstract References Related Articles Recommended Metrics Download:  PDF(3319KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Thermal barrier coatings (TBCs) are widely used in turbine engines to protect hot–section metallic components from corrosion and oxidation. The typical material of TBCs is 8YSZ due to its low thermal conductivity (2.1 W·m−1·K−1) and relatively high thermal expansion coefficient (1.1×10−5 K−1). However, at temperature above 1200 ℃, it could hardly be used for long–term application for its low sintering resistance and low phase stability. So it is urgently needed to develop novel TBCs materials with higher phase stability and lower thermal conductivity than 8YSZ. Recently, some materials have been evaluated as the candidates for TBCs, such as LaMgAl11O17 (LMA), La2Zr2O7(LZ), La2Ce2O7(LC) and La2(Zr0.7Ce0.3)2O7 (LZ7C3). Among those interesting candidates, the LZ7C3 ceramic shows the promising thermophysical properties for high–temperature TBCs. In this paper, the novel thermal barrier coating of LZ7C3) was prepared by atmospheric plasma spraying. The microstructure, phase structure, composition, phase stability, thermal conductivity and thermal shock behavior of LZ7C3 coating were studied. These results show that the coating had single pyrochlore structure with high phase stability in high temperature. The thermal conductivity of coating is 20% lower than the bulk material due to high porosity of coating. The thermal shock tests indicate that the lifetime and failure mechanism depend on the test temperature. The coatings are failed after 116 cyc thermal shock from 1000  to room temrature, which is attributed to the spallation of lamella. The failure mode of lamella spallation and layer fracture are found when the coating tested at 1100 ℃, the thermal shock lifetime is 53 cyc. whereas at 1200 ℃, the coatings are spalled entirely after 3 cyc thermal shock in the way of layer fractur at the interface between LZ7C3 and bond coat. Key words:  thermal barrier coating      La2(Zr0.7Ce0.3)2O7       plasma spraying      thermal conductivity      thermal shock resistance      Received:  07 December 2011      ZTFLH:  TB174.45   Fund:  Supported by National Basic Research Program of China (No.61311203B) Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors XIANG Jian-Yang CHEN Shu-Hai HUANG Ji-Hua WANG Rui-Jun HE Jing URL:  https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00758     OR     https://www.ams.org.cn/EN/Y2012/V48/I8/965 [1] Li M H, Zhang Z Y, Sun X F, Hu W Y, Gong S K. Acta Metall Sin, 2002; 38: 989 (李美缳 , 张重远, 孙晓峰, 胡望宇, 宫声凯. 金属学报, 2002; 38: 989) [2] Pomeroy M J. 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