| 等离子喷涂铈酸镧热障涂层 |
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| 引用本文： | 马文,郭洪波,宫声凯,董红英.等离子喷涂铈酸镧热障涂层[J].无机材料学报,2009,24(5):983-988. |
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| 作者姓名： | 马文 郭洪波 宫声凯 董红英 |
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| 作者单位： | （1. 内蒙古工业大学 材料科学与工程学院， 呼和浩特 010051；2. 北京航空航天大学 材料科学与工程学院， 北京 100083；3. 内蒙古工业大学 化工学院， 呼和浩特 010051） |
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| 基金项目： | 内蒙古自治区教育厅项目，内蒙古自然科学基金 |
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| 摘 要： | 采用等离子喷涂铈酸镧（La2Ce2O7, LC）粉末制备了铈酸镧热障涂层（TBCs）.由于等离子喷涂过程中CeO2的挥发量较多，造成涂层的实际成分为La2Ce1.66O4.32，与原始粉末成分相比有所偏离.在1400℃下经240h热处理后LC涂层发生轻微的分解.在1000℃下LC块材的热导率约为0.51W/(m·K)，比传统的氧化钇部分稳定的氧化锆（YSZ）块材的热导率降低了约75%.LC涂层的热膨胀系数（CTE）在450～1100℃范围内介于10×10-6～13×10-6K-1，与相应温度范围内的YSZ相比较高.热膨胀性能测量表明，LC涂层从室温升到1250℃时发生轻微的烧结，在1250℃保温过程发生明显的烧结现象.LC热障涂层在1100℃条件下经60次热循环后从陶瓷层内部发生剥落.
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| 关 键 词： | 热障涂层 铈酸镧 等离子喷涂 热循环 |
| 收稿时间： | 2009-1-13 |
| 修稿时间： | 2009-2-20 |
Lanthanum-cerium Oxide Thermal Barrier Coatings Prepared by Atmospheric Plasma Spraying |
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| MA Wen,GUO Hong-Bo,GONG Sheng-Kai,DONG Hong-Ying.Lanthanum-cerium Oxide Thermal Barrier Coatings Prepared by Atmospheric Plasma Spraying[J].Journal of Inorganic Materials,2009,24(5):983-988. |
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| Authors: | MA Wen GUO Hong-Bo GONG Sheng-Kai DONG Hong-Ying |
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| Affiliation: | (1. School of Materials Science and Engineering, Inner Mongolia University of Technology, Huhhot 010051, China; 2. School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China; 3. School of Chemistry Engineering, Inner Mongolia University of Technology, Huhhot 010051, China) |
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| Abstract: | Lanthanum-cerium oxide (La2Ce2O7, LC) thermal barrier coatings (TBCs) were prepared by atmospheric plasma spraying (APS). The actual composition of the as-sprayed coating is La2Ce1.66O4.32, due to the volatilization of CeO2 phase during the spray process. A little decomposition of the LC coating takes place after annealing at 1400℃ for 240h. The thermal conductivity of bulk LC material is about 0.51W/(m·K) at 1000℃, which is one fourth of that of typical bulk YSZ. The coefficient of thermal expansion (CTE) of the LC coating ranges from 10×10-6K-1 to 13×10-6K-1 at the temperature from 450℃ to 1100℃, which is relatively higher than that of the YSZ coating. Dilatometric measurements show that there is slight shrinkage in the coating till 1250℃, however, a remarkable sintering process happens cluring holding period at 1250℃. A spallation of the LC TBC occurs after 60 cycles at 1100℃ by typical delaminating cracking within the LC topcoat. |
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| Keywords: | thermal barrier coatings lanthanum-cerium oxide plasma spraying thermal cycling |
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