| Synthesis kinetics and thermophysical properties of La_2（Zr_（0.7）Ce_（0.3））_2O_7 ceramic for thermal barrier coatings |
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| 引用本文： | 项建英,陈树海,黄继华,梁文建,曹艳军,汪瑞军,何箐.Synthesis kinetics and thermophysical properties of La_2（Zr_（0.7）Ce_（0.3））_2O_7 ceramic for thermal barrier coatings[J].中国稀土学报(英文版),2012,30(3):228-232. |
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| 作者姓名： | 项建英 陈树海 黄继华 梁文建 曹艳军 汪瑞军 何箐 |
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| 作者单位： | School of Materials Science and Engineering, University of Science and Technology Beijing;Beijing Golden Wheel Special Machine Co., Ltd |
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| 基金项目： | Project supported by National Basic Research Program of China (973 Program, 613112) |
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| 摘 要： | La2(Zr0.7Ce0.3)2O7 (LZ7C3) ceramic was synthesized by solid state reaction with La2O3, ZrO2 and CeO2 as starting materials. The synthesis kinetics, phase structure, mass loss and microstructure were studied by thermo gravimetric-different thermal analyzer (TG-DTA), X-ray difference (XRD) and scanning electron microscopy (SEM). The thermal conductivity and thermal expansion coefficient were measured by laser-flash method and pushing-rod method, respectively. XRD results showed that LZ7C3 was a mixture of La2Zr2O7 (LZ, pyro- chlore) and La2Ce2O7 (LC, fluorite). The lowest synthesis temperature and time of LZ7C3 were 1400 oC and 5 h. There were no peaks of La2O3 when the powder granularity was about 0.82 μm in the synthesis process. The atom ratio La:Zr:Ce of prepared LZ7C3 powder was very close to 10:7:3 which was the theory value of LZ7C3. The thermal conductivity of LZ7C3 decreased gradually with the temperature increased up to 1200 oC, and was located within 0.79 to 1.02 W/(m·K), which was almost 50% lower than that of LZ, whereas its thermal expansion coefficient was larger and the value was 11.6×10-6 K-1.
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| 关 键 词： | LZ7C3 thermal barrier coating thermal conductivity thermal expansion coefficient rare earths |
| 收稿时间： | 15 July 2011 |
Synthesis kinetics and thermophysical properties of La2(Zr0.7Ce0.3)2O7 ceramic for thermal barrier coatings |
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| XIANG Jianying,CHEN Shuhai,HUANG Jihua,LIANG Wenjian,CAO Yanjun,WANG Ruijun,HE Qing.Synthesis kinetics and thermophysical properties of La2(Zr0.7Ce0.3)2O7 ceramic for thermal barrier coatings[J].Journal of Rare Earths,2012,30(3):228-232. |
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| Authors: | XIANG Jianying CHEN Shuhai HUANG Jihua LIANG Wenjian CAO Yanjun WANG Ruijun HE Qing |
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| Affiliation: | 1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Beijing Golden Wheel Special Machine Co., Ltd., Beijing 100083, China) |
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| Abstract: | La2(Zr0.7Ce0.3)2O7 (LZ7C3) ceramic was synthesized by solid state reaction with La2O3, ZrO2 and CeO2 as starting materials. The synthesis kinetics, phase structure, mass loss and microstructure were studied by thermo gravimetric-different thermal analyzer (TG-DTA), X-ray difference (XRD) and scanning electron microscopy (SEM). The thermal conductivity and thermal expansion coefficient were measured by laser-flash method and pushing-rod method, respectively. XRD results showed that LZ7C3 was a mixture of La2Zr2O7 (LZ, pyro- chlore) and La2Ce2O7 (LC, fluorite). The lowest synthesis temperature and time of LZ7C3 were 1400 oC and 5 h. There were no peaks of La2O3 when the powder granularity was about 0.82 μm in the synthesis process. The atom ratio La:Zr:Ce of prepared LZ7C3 powder was very close to 10:7:3 which was the theory value of LZ7C3. The thermal conductivity of LZ7C3 decreased gradually with the temperature increased up to 1200 oC, and was located within 0.79 to 1.02 W/(m·K), which was almost 50% lower than that of LZ, whereas its thermal expansion coefficient was larger and the value was 11.6×10–6 K–1. |
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| Keywords: | LZ7C3 thermal barrier coating thermal conductivity thermal expansion coefficient rare earths |
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