无机材料学报 ›› 2023, Vol. 38 ›› Issue (6): 663-670.DOI: 10.15541/jim20220637

• 研究论文 • 上一篇    下一篇

Gd/Bi0.5Sb1.5Te3热电磁梯度复合材料的服役稳定性

汪波1(), 余健1,2(), 李存成1,3, 聂晓蕾1, 朱婉婷1, 魏平1, 赵文俞1(), 张清杰1   

  1. 1.武汉理工大学 材料复合新技术国家重点实验室, 武汉 430070
    2.九江学院 材料科学与工程学院, 九江 332005
    3.山东理工大学 材料科学与工程学院, 淄博 255000
  • 收稿日期:2022-10-28 修回日期:2022-12-15 出版日期:2023-06-20 网络出版日期:2022-12-28
  • 通讯作者: 余健, 讲师. E-mail: jianyujju@126.com;
    赵文俞, 教授. E-mail: wyzhao@whut.edu.cn
  • 作者简介:汪波(1996-), 男, 硕士研究生. E-mail: bowang@whut.edu.cn
  • 基金资助:
    国家重点研发计划(2019YFA0704903);国家自然科学基金(91963207);国家自然科学基金(52130203);国家自然科学基金(11834012);国家自然科学基金(52201256);佛山仙湖实验室开放基金(XHT2020-004)

Service Stability of Gd/Bi0.5Sb1.5Te3 Thermo-electro-magnetic Gradient Composites

WANG Bo1(), YU Jian1,2(), LI Cuncheng1,3, NIE Xiaolei1, ZHU Wanting1, WEI Ping1, ZHAO Wenyu1(), ZHANG Qingjie1   

  1. 1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
    2. School of Materials Science and Engineering, Jiujiang University, Jiujiang 332005, China
    3. School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, China
  • Received:2022-10-28 Revised:2022-12-15 Published:2023-06-20 Online:2022-12-28
  • Contact: YU Jian, lecturer. E-mail: jianyujju@126.com;
    ZHAO Wenyu, professor. E-mail: wyzhao@whut.edu.cn
  • About author:WANG Bo (1996-), male, Master candidate. E-mail: bowang@whut.edu.cn
  • Supported by:
    National Key Research and Development Program of China(2019YFA0704903);National Natural Science Foundation of China(91963207);National Natural Science Foundation of China(52130203);National Natural Science Foundation of China(11834012);National Natural Science Foundation of China(52201256);Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory(XHT2020-004)

摘要:

将热电材料与磁卡材料复合, 发展基于热电制冷和磁制冷耦合增强的热电磁能源转换全固态制冷新技术, 有望实现从热电制冷向热电磁制冷的技术变革, 但目前热电磁复合材料在服役环境下的稳定性还有待研究。本研究采用放电等离子体烧结技术将Bi0.5Sb1.5Te3(BST)热电材料和Gd磁卡材料复合, 制备了一系列Gd/BST热电磁梯度复合材料, 系统研究了该复合材料在338 K、80%相对湿度(RH)的环境下老化12 d过程中的物相组成、显微结构、热电性能及制冷性能的演变特征。结果显示, Gd/BST热电磁梯度复合材料的物相组成和显微结构具有良好的服役稳定性, Gd/BST异质界面的Gd-Te扩散层化学成分和厚度(~4.5 µm)在老化过程中未发生明显变化。测试不同Gd浓度梯度方向热电性能和单臂器件制冷性能发现, 老化前后材料的ZT变化非常小, 单臂器件制冷温差在2.5 A阀值电流下稳定在6.5 K左右, 表明Gd/BST热电磁梯度复合材料具有良好的热电性能和制冷性能服役稳定性。

关键词: 热电磁梯度复合, 热电性能, 制冷性能, 服役稳定性

Abstract:

Combining thermoelectric materials with magnetocaloric materials enables a potential new all-solid-state cooling technology based on coupling enhancement of thermoelectric cooling and magnetic cooling, which is highly expected to achieve a technological change from thermoelectric cooling to thermoelectromagnetic cooling. However, the stability of thermal-electro-magnetic composites in service environment is still unknown. Herein, a series of Gd/BST thermo-electro-magnetic gradient composites were prepared by combining Bi0.5Sb1.5Te3 (BST) thermoelectric material and Gd magnetocaloric material via spark plasma sintering technology. Evolution of phase composition, microstructure, thermoelectric, and cooling performance of the gradient composites during the 12 d aging process at 338 K and 80% relative humidity(RH) were systematically studied. The results show that the phase composition and microstructure of Gd/BST thermal-electro-magnetic gradient composites have excellent service stability. The chemical composition and average thickness (~4.5 μm) of Gd-Te diffusion layer at Gd/BST heterogeneous interface doesn’t exhibit obvious change during the aging process. The test of thermoelectric and cooling performance along different Gd concentration gradient indicates that ZT of the materials negligibly changed before and after aging treatment, and the cooling temperature difference of the single-leg device is stable at about 6.5 K under the threshold current of 2.5 A. These results show that thermoelectric and cooling performance of the Gd/BST gradient composites have excellent service stability.

Key words: thermo-electro-magnetic gradient composites, thermoelectric performance, cooling performance, service stability

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