(Sm0.2Gd0.2Dy0.2Y0.2Yb0.2)3TaO7高熵陶瓷的制备及热物理性能

doi:10.15541/jim20200489

无机材料学报 ›› 2021, Vol. 36 ›› Issue (4): 405-410.DOI: 10.15541/jim20200489 CSTR: 32189.14.10.15541/jim20200489

(Sm_0.2Gd_0.2Dy_0.2Y_0.2Yb_0.2)₃TaO₇高熵陶瓷的制备及热物理性能

桑玮玮¹^,²(), 张红松²(), 陈华辉¹, 温斌², 李新春²

1.中国矿业大学(北京) 机电与信息工程学院, 北京 100083
2.河南工程学院机械工程学院, 郑州 450019

收稿日期:2020-08-24 修回日期:2020-10-05 出版日期:2021-04-20 网络出版日期:2020-10-30
通讯作者: 张红松, 教授. E-mail: zhsandchen@126.com
作者简介:桑玮玮(1982-), 女, 博士研究生, 讲师. E-mail: lyftt0602@126.com
基金资助:
河南省高校科技创新团队(18IRTSHN005);河南省高等学校重点科研项目(20A5600008)

Preparation and Thermophysical Properties of (Sm_0.2Gd_0.2Dy_0.2Y_0.2Yb_0.2)₃TaO₇High-entropy Ceramic

SANG Weiwei¹^,²(), ZHANG Hongsong²(), CHEN Huahui¹, WEN Bin², LI Xinchun²

1. School of Mechanical Electronic & Information Engineering, China University of Mining & Technology-Beijing, Beijing 10083, China
2. College of Mechanical Engineering, Henan University of Engineering, Zhengzhou 451191, China

Received:2020-08-24 Revised:2020-10-05 Published:2021-04-20 Online:2020-10-30
Contact: ZHANG Hongsong, professor. E-mail: zhsandchen@126.com
About author:SANG Weiwei(1982-), female, PhD candidate, lecturer. E-mail: lyftt0602@126.com
Supported by:
Henan Province University Scientific and Technological Innovation Team (18IRTSHN005); Key Project of Science and Technology Research at Henan Province Department of Education (20A5600008)

摘要/Abstract

摘要：

寻求具有良好热物理性能的新型陶瓷材料是热障涂层领域的研究热点之一。本研究采用固相反应法制备了(Sm_0.2Gd_0.2Dy_0.2Y_0.2Yb_0.2)₃TaO₇高熵陶瓷材料, 对其晶体结构、显微组织、元素分布、结构稳定性和热物理性能进行了研究。结果表明: 制备的高熵陶瓷具有单一的缺陷萤石结构, 元素分布均匀, 晶粒尺寸在0.2~3 μm之间。经高温循环热处理后依然保持单一的萤石结构, 表现出良好的高温结构稳定性。25~800 ℃范围内热导率为0.72~0.74 W/(m?K), 远低于7YSZ, 1200 ℃下的热膨胀系数约为5.6×10^-6K^-1, 低于热障涂层(TBCs)对表面陶瓷层材料的要求, 但与环境障涂层(EBCs)硅基陶瓷基体的热膨胀系数((3.4~5.5)×10^-6K^-1)接近。

关键词: 高熵陶瓷, 热障涂层, 热导率, 热膨胀系数

Abstract:

Developing novel ceramic materials with excellent thermophysical properties is one of the hotspots in the field of thermal barrier coatings. The (Sm_0.2Gd_0.2Dy_0.2Y_0.2Yb_0.2)₃TaO₇ high-entropy ceramic was fabricated via high-temperature solid-state reaction. The crystal structure, microstructure, phase stability and thermophysical properties were investigated. Results indicate that (Sm_0.2Gd_0.2Dy_0.2Y_0.2Yb_0.2)₃TaO₇high-entropy ceramic has single defective fluorite structure, its elements are homogenously distributed, its grain size ranges from 0.2 to 3 μm. After high-temperature thermal cycling, the sample still remains single fluorite structure, showing excelleent phase stability at high temperature. Thermal conductivity lies in the range of 0.72-0.74 W/(m·K), lower than that of 7YSZ. Thermal expansion coefficient at 1200 ℃ is 5.6×10^-6 K^-1, lower than requirement of thermal barrier coatings (TBCs) for surface ceramic layer. However, its thermal expansion coefficient is close to that of the silicon-based ceramics substrate of environmental barrier coatings (EBCs) ((3.4-5.5)×10^-6 K^-1).

Key words: high-entropy ceramic, thermal-barrier coating, thermal conductivity, thermal expansion coefficient

中图分类号:

TQ174

桑玮玮, 张红松, 陈华辉, 温斌, 李新春. (Sm_0.2Gd_0.2Dy_0.2Y_0.2Yb_0.2)₃TaO₇高熵陶瓷的制备及热物理性能[J]. 无机材料学报, 2021, 36(4): 405-410.

SANG Weiwei, ZHANG Hongsong, CHEN Huahui, WEN Bin, LI Xinchun. Preparation and Thermophysical Properties of (Sm_0.2Gd_0.2Dy_0.2Y_0.2Yb_0.2)₃TaO₇High-entropy Ceramic[J]. Journal of Inorganic Materials, 2021, 36(4): 405-410.

图/表 6

图1 (Sm0.2Gd0.2Dy0.2Y0.2Yb0.2)3TaO7的XRD图谱

Fig. 1 XRD patterns of (Sm0.2Gd0.2Dy0.2Y0.2Yb0.2)3TaO7

图2 (Sm0.2Gd0.2Dy0.2Y0.2Yb0.2)3TaO7的拉曼图谱

Fig. 2 Raman spectra of (Sm0.2Gd0.2Dy0.2Y0.2Yb0.2)3TaO7

图3 (Sm0.2Gd0.2Dy0.2Y0.2Yb0.2)3TaO7的SEM与EDS面扫描

Fig. 3 SEM image and EDS mappings of (Sm0.2Gd0.2Dy0.2- Y0.2Yb0.2)3TaO7

图4 (Sm0.2Gd0.2Dy0.2Y0.2Yb0.2)3TaO7的DSC和TGA曲线

Fig. 4 DSC and TGA curves of (Sm0.2Gd0.2Dy0.2Y0.2Yb0.2)3TaO7

图5 (Sm0.2Gd0.2Dy0.2Y0.2Yb0.2)3TaO7热处理前后的XRD和Raman对比图谱

Fig. 5 Comparison of XRD patterns and Raman spectra of (Sm0.2Gd0.2 Dy0.2 Y0.2Yb0.2)3TaO7 before and after thermal cycling

图6 (Sm0.2Gd0.2Dy0.2Y0.2Yb0.2)3TaO7的热物理性能

Fig. 6 Thermophysical properties of (Sm0.2Gd0.2Dy0.2Y0.2Yb0.2)3TaO7 (a) Specific heat capacity; (b) Thermal diffusivity; (c) Thermal conductivity; (d) Thermal expansion coefficient

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(Sm_0.2Gd_0.2Dy_0.2Y_0.2Yb_0.2)₃TaO₇高熵陶瓷的制备及热物理性能

Preparation and Thermophysical Properties of (Sm_0.2Gd_0.2Dy_0.2Y_0.2Yb_0.2)₃TaO₇High-entropy Ceramic

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