大气等离子体喷涂Sm2Zr2O7涂层的结构和性能

doi:10.3724/SP.J.1077.2011.00696

无机材料学报 ›› 2011, Vol. 26 ›› Issue (7): 696-700.DOI: 10.3724/SP.J.1077.2011.00696

大气等离子体喷涂Sm₂Zr₂O₇涂层的结构和性能

于建华^1,2, 赵华玉^1,2, 周霞明^1,2, 陶顺衍^1,2, 丁传贤^1,2

(1. 中国科学院特种无机涂层重点实验室, 上海200050; 2. 中国科学院上海硅酸盐研究所, 上海200050)

收稿日期:2010-09-09 修回日期:2010-11-01 出版日期:2011-07-20 网络出版日期:2011-06-20
作者简介:于建华(1984-), 女, 博士研究生. E-mail: yujianhua@mail.sic.ac.cn

Microstructure and Properties of Air Plasma Sprayed Sm₂Zr₂O₇ Coatings

YU Jian-Hua^1,2, ZHAO Hua-Yu^1,2, ZHOU Xia-Ming^1,2, TAO Shun-Yan^1,2, DING Chuan-Xian^1,2

(1. Key Laboratory of Inorganic Coating Materials, Chinese Academy of Sciences, Shanghai 200050, China; 2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China)

Received:2010-09-09 Revised:2010-11-01 Published:2011-07-20 Online:2011-06-20

摘要/Abstract

摘要： 稀土锆酸盐材料具有比Y₂O₃部分稳定ZrO₂陶瓷低的热导率, 是新型热障涂层的潜在候选材料之一. 利用大气等离子体喷涂技术以喷雾造粒的Sm₂Zr₂O₇粉体制备涂层, 并在相同条件下沉积8wt%Y₂O₃稳定ZrO₂涂层. 对比评价了两种涂层的结构、热物理性能和力学性能. X射线衍射结果表明, 制备态Sm₂Zr₂O₇涂层为缺陷萤石结构. 扫描电镜分析显示, Sm₂Zr₂O₇和8wt%Y₂O₃稳定ZrO₂涂层为典型的层状结构, 内部有很多气孔、裂纹等缺陷. 800℃测得的 Sm₂Zr₂O₇涂层的热导率为0.44 W/(mK), 比相同条件下测得的8wt%Y₂O₃稳定ZrO₂涂层的热导率低~40%, 两者的热膨胀系数相似. 力学测试结果显示, Sm₂Zr₂O₇涂层的抗折强度、硬度和弹性模量均低于8wt%Y₂O₃稳定ZrO₂涂层.

关键词: 等离子体喷涂, Sm₂Zr₂O₇涂层, 热导率, 力学性能

Abstract: Rare-earth zirconates with a pyrochlore structure have attracted great attention for potential application in thermal barrier coating systems. In the present work, Sm₂Zr₂O₇coatings were deposited by atmospheric plasma spraying technology. Their microstructure, thermo-physical and mechanical properties were examined, and compared with that of 8wt% Y₂O₃ stabilized ZrO₂coatings which was deposited under the same plasma spraying conditions. X-ray diffraction result shows that the as-sprayed Sm₂Zr₂O₇ coating exhibits a defective fluorite structure. The thermal conductivity of Sm₂Zr₂O₇ coating measured at 800℃ is 0.44W/(mK), about 40% lower than that of 8wt% Y₂O₃ stabilized ZrO₂ coating, but the expansion coefficients of both coatings are similar. The Sm₂Zr₂O₇ coating exhibits lower bending strength, microhardness and elastic modulus compared with 8wt% Y₂O₃ stabilized ZrO₂ coating.

Key words: plasma spraying, Sm₂Zr₂O₇coating, thermal conductivity, mechanical property

中图分类号:

TQ174

于建华, 赵华玉, 周霞明, 陶顺衍, 丁传贤. 大气等离子体喷涂Sm₂Zr₂O₇涂层的结构和性能[J]. 无机材料学报, 2011, 26(7): 696-700.

YU Jian-Hua, ZHAO Hua-Yu, ZHOU Xia-Ming, TAO Shun-Yan, DING Chuan-Xian. Microstructure and Properties of Air Plasma Sprayed Sm₂Zr₂O₇ Coatings[J]. Journal of Inorganic Materials, 2011, 26(7): 696-700.

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大气等离子体喷涂Sm₂Zr₂O₇涂层的结构和性能

Microstructure and Properties of Air Plasma Sprayed Sm₂Zr₂O₇ Coatings

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