摘要
half-Heusler合金因其热电性能和机械性能良好、热稳定性高,在中高温温差发电领域备受关注。为分析改变合金中Fe元素和Ni元素的比例对TiFeNiSb基half-Heusler合金热电性能的影响,通过电弧熔炼、高能球磨、快速直流热压相结合的工艺制备half-Heusler合金TiFe_(x)Ni_(1−x)Sb(x=0.4,0.5,0.6)样品,分别测定其导电类型及其载流子浓度。结果表明:改变合金中Fe元素和Ni元素的比例可以提升室温载流子浓度;TiFe_(0.6)Ni_(0.4)Sb样品的室温载流子浓度最高,为5.33×10^(21)cm^(−3),且该样品的晶格热导率也较低,973 K时其晶格热导率为3.18 W·m^(–1)·K^(–1),表明改变合金中Fe、Ni元素的比例是一种有效优化热电性能的方法。
Half-Heusler alloy has attracted much attention in the field of medium and high temperature thermoelectric power generation because of its good thermoelectric properties,good mechanical properties and high thermal stability.In order to understand the influence of changing the ratio of Fe to Ni on the thermoelectric properties of samples of half-Heusler alloy TiFe_(x)Ni_(1-x)Sb(x=0.4,0.5,0.6),the samples were prepared by arc melting,high-energy ball milling and fast DC hot pressing,and their conductivity types and carrier concentrations were determined respectively.The experimental results show that the carrier concentration at room temperature can be increased by changing the ratio of Fe to Ni in the alloy,and the carrier concentration at room temperature of TiFe_(0.6)Ni_(0.4)Sb sample is the highest,which is 5.33×10^(21)cm^(3),and lower lattice thermal conductivity at 973 K of about 3.18 W m^(–1)K^(–1).It shows that changing the proportion of Fe and Ni elements in the alloy is an effective method to optimize thermoelectric properties.
作者
刘行
黄丽宏
LIU Hang;HUANG Lihong(School of Materials Science and Engineering,Xihua University,Chengdu 610039 China)
出处
《西华大学学报(自然科学版)》
2025年第5期17-22,38,共7页
Journal of Xihua University:Natural Science Edition
基金
四川省自然科学基金青年科学基金项目(2025ZNSFSC1336)。
