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Thermophysical properties of Sm_2(Zr_(1-x)Ce_x)_2O_7 ceramics

查看全文 作　　者：ZHANG [1]Hongsong;SUN [2]Kun;XU [3]Qiang;WANG [3]Fuchi;LIU [3]Ling;WEI [1]Yuan;CHEN [2]Xiaoge 高影响力作者 机构地区：[1]Department of Mechanical Engineering, Henan Institute of Engineering, Zhengzhou 450007, China;[2]Department of Physics and Electronics, Chuxiong University, Chuxiong 675000, China;[3]School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China高影响力机构 出　　处：《Rare Metals》索引2009年第28卷第3期,共5页高影响力期刊 基　　金：supported by the Doctor Research Fund of Henan Institute of Engineering (No. D2007012) 摘　　要：Sm2(Zr1-xCex)2O7 (x=0.1, 0.2, and 0.3) ceramics were prepared by solid reaction method at 1600°C for 10 h using Sm2O3, ZrO2, and CeO2 as starting reactants. The phase compositions, microstructures, thermal expansion coefficients, and partial thermal conductivities of these materials were investigated. X-ray diffraction (XRD) results reveal that Sm2(Zr0.9Ce0.1)2O7 with pyrochlore structure and Sm2(Zr1-xCex)2O7 (x=0.2 and 0.3) with fluorite structure were synthesized, and scanning electrical microscopy (SEM) images show that the microstructures of these products are very dense. The linear thermal expansion coefficients increase with increasing temperature in the temperature range from ambient to 1200°C, and the thermal expansion coefficients increase with increasing content of doped CeO2. The thermal conductivities of Sm2(Zr0.8Ce0.2)2O7 and Sm2(Zr0.7Ce0.3)2O7 decrease gradually with an increase in temperature. These results show that the synthesized ceramic materials can be explored as novel prospective candidate materials for use in new thermal barrier coating systems in the future. 关 键 词：SM2O3 陶瓷材料 氧化锆 热物理性质 线性热膨胀系数 扫描电子显微镜 温度范围 萤石结构
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