摘要
热电器件性能直接影响着热电转换装置的转换效率及使用寿命。本工作针对方钴矿热电器件高温服役环境下性能衰减的问题,采用大功率热电器件测试系统开展热电器件服役性能影响因素研究。结果表明,方钴矿热电转换装置输出功率随着时间延长而显著降低,其主要原因在于高温条件下方钴矿热电材料、电极材料与Fe基防扩散阻挡层之间发生相互反应生成扩散层,致使界面电阻增大;同时,由于热电材料、电极材料与Fe基防扩散阻挡层的热膨胀系数匹配性能不佳,高温条件下焊接界面处开裂,热电器件内阻增大。由此可见,防扩散阻挡层的高温稳定性和热膨胀匹配性是影响方钴矿热电器件性能的关键,成为后续方钴矿热电器件实现工程应用的核心问题。
The performance of thermoelectric devices directly affects the conversion efficiency and service life of thermoelectric conversion devices.This work focused on the issue of performance degradation of cobalt-based thermoelectric devices in high-temperature service environments.A high-power thermoelectric device testing system was used to study the factors affecting the service performance of thermoelectric devices.The research results indicate that the output power of the cobaltite thermoelectric conversion device significantly decreases with time,mainly due to the mutual reaction among the skutterudite compound,electrode material,and Fe-based diffusion barrier layer under high temperature conditions,resulting in an increase in interface resistance.At the same time,due to the poor thermal expansion matching among the thermoelectric materials,electrode materials and Fe-based diffusion barrier layer,the welding interface cracks under high temperature conditions,and the internal resistance of the thermoelectric device increases.From this,it can be seen that the high-temperature stability and thermal expansion matching of the diffusion barrier layer are the key factors affecting the performance of skutterudite thermoelectric devices,and have become the core issues for the subsequent engineering applications of skutterudite thermoelectric devices.
作者
左彤
唐显
李鑫
何虎
牛厂磊
隋解和
郭逢凯
ZUO Tong;TANG Xian;LI Xin;HE Hu;NIU Changlei;SUI Jiehe;GUO Fengkai(Institute of Nuclear Technology,China Institute of Atomic Energy,Beijing 102413,China;School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2024年第21期27-34,共8页
Materials Reports
关键词
热电器件
防扩散阻挡层
热电转换
方钴矿材料
thermoelectric device
diffusion barrier layer
thermoelectric conversion
skutterudite
