| Thermal conductivity of （Sm1-xLax）2Zr2O7 （x=0, 0.25, 0.5, 0.75 and 1） oxides for advanced thermal barrier coatings |
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| 引用本文： | 张红松,孙坤,徐强,王富耻,刘玲. Thermal conductivity of （Sm1-xLax）2Zr2O7 （x=0, 0.25, 0.5, 0.75 and 1） oxides for advanced thermal barrier coatings[J]. 中国稀土学报(英文版), 2009, 27(2): 222-226. DOI: 10.1016/S1002-0721(08)60223-9 |
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| 作者姓名： | 张红松 孙坤 徐强 王富耻 刘玲 |
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| 作者单位： | ZHANG Hongsong(Department of Mechanical Engineering,Henan Institute of Engineering,Zhengzhou 450007,China);SUN Kun(Department of Physics and Electronics,Chuxiong Normal University,Chuxiong 675000,China);XU Qiang,WANG Fuchi,LIU Ling(School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China) |
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| 基金项目： | Foundation item： Project supported by Doctoral Fund of Henan Institute of Engineering （D2007012） |
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| 摘 要： |
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| 关 键 词： | 导热系数 热障涂层 氧化物 结构陶瓷材料 傅立叶变换红外光谱 扫描电子显微镜 FT-IR X射线衍射仪 |
| 收稿时间： | 2008-07-08 |
Thermal conductivity of (Sm1-xLax)2Zr2O7 (x=0, 0.25, 0.5, 0.75 and 1) oxides for advanced thermal barrier coatings |
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| ZHANG Hongsong,SUN Kun,XU Qiang,WANG Fuchi,LIU Ling. Thermal conductivity of (Sm1-xLax)2Zr2O7 (x=0, 0.25, 0.5, 0.75 and 1) oxides for advanced thermal barrier coatings[J]. Journal of Rare Earths, 2009, 27(2): 222-226. DOI: 10.1016/S1002-0721(08)60223-9 |
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| Authors: | ZHANG Hongsong SUN Kun XU Qiang WANG Fuchi LIU Ling |
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| Affiliation: | [1]Department of Mechanical Engineering, Henan Institute of Engineering, Zhengzhou 450007, China [2]Department of Physics and Electronics, Chuxiong Normal University, Chuxiong 675000, China [3]School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China |
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| Abstract: | Pyrochlore oxides of general compositions, A2Zr2O7, where A is a 3+ cation (La to Lu), are promising candidate materials for ap-plications as high temperature thermal barrier coatings because of their high melting points, high thermal expansion coefficients, and low thermal conductivities. In this study, oxides of Sm2Zr2O7, (Sm0.75La0.25)2Zr2O7, (Sm0.5 La0.5)2Zr2O7, (Sm0.25La0.75)2Zr2O7 and La2Zr2O7 were prepared by solid reactions at 1600 ℃ for 10 h using Sm2O3, La2O3 and ZrO2 as the reactants. The phase compositions of these ceramic ma-terials were analyzed by X-ray diffractometer (XRD) and fourier transform infrared spectroscopy (FT-IR) methods, respectively. The micro-structure was observed by scanning electronl microscope (SEM). The thermal conductivities of these ceramic materials were measured using laser-flash method. XRD and FT-IR results showed that pure ceramic materials with pyrochlore structure were prepared successfully. SEM results indicated that microstructures of these ceramic materials were dense and grain boundaries were very clean. The La2O3 doped Sm2Zr2O7 pyrochlores (Sm0.75 La0.25)2Zr2O7 and (Sm0.5 La0.5)2Zr2O7 had lower thermal conductivity than the undoped Sm2Zr2O7. The thermal conductivity of (Sm0.25La0.75)2Zr2O7 was found to be lower than that of La2Zr2O7. The results showed that these ceramic materials had the poten-tial to be used as candidate materials for TBCs. |
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| Keywords: | pyrochlore oxides thermal conductivity thermal barrier coatings doping rare earths |
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