N型YbxCo4Sb12热电材料及涂层的制备与性能研究
Rare Metal Materials and Engineering（2021）
Abstract
采用熔融-退火-放电等离子烧结工艺制备了YbxCo4Sb12(x=0.27,0.28,0.29,原子比)合金块体样品.XRD、SEM、EDS分析表明,成功合成了Yb掺杂的单相CoSb3热电材料.当Yb含量从0.27上升至0.29,材料的功率因子随温度的升高呈现先上升后下降趋势,热导率则先下降后上升.由于相对较高的功率因子1815 μW·m-1·K-2以及较低的热导率2.23 W·m-1·K-1,合金Yb0.29Co4Sb12在773 K时获得较高的ZT值0.62.以磁控溅射法对N型热电元件Yb0.29Co4Sb12进行Al-Ni防护涂层溅射,SEM、EDS结果表明涂层与基底结合良好,经涂层防护后的Yb0.29Co4Sb12元件热电性能稳定性较好.以钎料Ag40Cu60对热电材料Yb0.29Co4Sb12与电极片Mo50Cu50的接头进行焊接,发现界面处结合良好,界面处Co、Sb、Yb、Mo等元素未发生严重扩散.
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Key words
CoSb3,thermoelectric material,Al-Ni coating,thermoelectric properties
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