金属学报  2012, Vol. 48 Issue (8): 965-970    DOI: 10.3724/SP.J.1037.2011.00758

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等离子喷涂La2(Zr0.7Ce0.3)2O7热障涂层的抗热震性能

项建英,陈树海, 黄继华,赵兴科,  张华

北京科技大学 材料科学与工程学院, 北京 100083

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

项建英 陈树海 黄继华 赵兴科 张华. 等离子喷涂La₂(Zr_0.7Ce_0.3)₂O₇热障涂层的抗热震性能[J]. 金属学报, 2012, 48(8): 965-970.
, , , , . THERMAL SHOCK RESISTANCE OF La₂(Zr_0.7Ce_0.3)₂O₇ THERMAL BARRIER COATING PREPARED BY ATMOSPHERIC PLASMA SPRAYING[J]. Acta Metall Sin, 2012, 48(8): 965-970.

摘要 参考文献 相关文章 Metrics 全文: PDF(3319 KB)   摘要: 采用等离子喷涂制备了La2(Zr0.7Ce0.3)2O7(LZ7C3)热障涂层, 并对涂层的微观组织、相结构、成分、相稳定性、涂层热导率以及抗热震性能进行了研究. 结果表明, LZ7C3涂层由单相烧绿石结构物质组成, 高温稳定性较好; 涂层的热导率较块材下降约20%, 这是由于涂层具有较高的孔隙率所致; 涂层在不同温度范围的热震寿命和失效机制不同, 在室温至约1000℃间的热震寿命为116 cyc, 涂层失效方式以片状剥落为主; 在室温至1100℃间的热震寿命为53 cyc, 涂层失效方式为片状剥落和层状撕裂; 在室温至1200℃间的热震寿命为3 cyc, 涂层失效方式以层状撕裂为主. 关键词 ： 热障涂层,  La2(Zr0.7Ce0.3)2O7,  等离子喷涂,  热导率,  抗热震性能     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 收稿日期: 2011-12-07      ZTFLH:  TB174.45   基金资助: 国家重大基础研究发展计划资助项目61311203B 作者简介: 项建英, 男, 1985年生, 博士生 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 项建英 陈树海 黄继华 汪瑞军 何箐 44.8K 链接本文: https://www.ams.org.cn/CN/10.3724/SP.J.1037.2011.00758      或      https://www.ams.org.cn/CN/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. Mater Des, 2005, 26: 223 [3] Cao X Q, R. Vassenb, D. Stoever. J Eur Ceram Soc, 2004;24: 1 [4] Mu R D, Xu Z H, He S M, He L M. 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