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2009 , Vol. 24 >Issue 5: 983 - 988

DOI: https://doi.org/10.3724/SP.J.1077.2009.00983

研究论文

等离子喷涂铈酸镧热障涂层

  • 马 文 ,
  • 郭洪波 ,
  • 宫声凯 ,
  • 董红英
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  • （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

  网络出版日期: 2009-09-20

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

  • MA Wen ,
  • GUO Hong-Bo ,
  • GONG Sheng-Kai ,
  • DONG Hong-Ying
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  • (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 date: 2009-01-13

  Revised date: 2009-02-20

  Online published: 2009-09-20

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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.

关键词： 热障涂层; 铈酸镧; 等离子喷涂; 热循环

本文引用格式

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 . DOI: 10.3724/SP.J.1077.2009.00983

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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