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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

等离子喷涂铈酸镧热障涂层

马 文1, 2， 郭洪波2， 宫声凯2， 董红英3   

  1. （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）
  • 收稿日期:2009-01-13 修回日期:2009-02-20 出版日期:2009-09-20 网络出版日期:2009-09-20

Lanthanum-cerium Oxide Thermal Barrier Coatings Prepared by Atmospheric Plasma Spraying

MA Wen1, 2, GUO Hong-Bo2, GONG Sheng-Kai2, DONG Hong-Ying3   

  1. (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)
  • Received:2009-01-13 Revised:2009-02-20 Published:2009-09-20 Online:2009-09-20

PDF (PC)

2057

被引次数

12 | 3

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.

关键词: 热障涂层, 铈酸镧, 等离子喷涂, 热循环

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.

Key words: thermal barrier coatings, lanthanum-cerium oxide, plasma spraying, thermal cycling

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