全赫斯勒合金Fe_(2)TiSn的自蔓延高温合成及其热电性能  

Study on Thermoelectric Properties of Full-Heusler Alloy FeTiSn Prepared by High Temperature Self-Propagating Synthesis

作　　者：田然 鄢永高 唐新峰[1] TIAN Ran;YAN Yonggao;TANG Xinfeng(School of Materials,Wuhan University of Technology,Wuhan 430000,China)

机构地区：[1]武汉理工大学材料学院,湖北武汉430000

出　　处：《热加工工艺》2021年第2期47-51,共5页Hot Working Technology

基　　金：国家自然科学基金项目(51772232)。

摘　　要：Fe_(2)TiSn合金是全赫斯勒合金的一种,在以往的计算中被预测为一种极具潜力的热电材料,且其力学性能、热力学稳定性均较好。以往制备全赫斯勒合金Fe_(2)TiSn采用的工艺是电弧熔炼后进行长达两周的退火,这需要很长的时间并且伴随这大量的能源消耗。采取一种全新的方式制备Fe_(2)TiSn合金,即采用自蔓延高温燃烧合成结合退火和等离子体活化烧结制备了元素分布均匀、成分控制良好、致密度可在97.5%以上的块体材料。Fe_(2)TiSn样品表现为本征p型传导,在300 K时最高ZT值为0.0071。该研究为快速、低成本制备全赫斯勒热电材料开辟了一条新途径。Fe_(2)TiSn is one of the Full-Heusler alloys. In the previous calculations, it has been predicted to be a potential thermoelectric material with good mechanical properties and thermodynamic stability. In the past, Fe_(2)TiSn was prepared by arc-melting followed by annealing for up to 2 weeks, which took a long time and was accompanied by a large amount of energy consumption. Fe_(2)TiSn was prepared by a new method, that was high temperature self-propagating combustion synthesis combined with annealing and plasma activation sintering. The bulk materials with uniform element distribution, well controlled composition and densification of more than 97.5% were prepared. Fe_(2)TiSn samples exhibit intrinsic p-type conduction. At 300 K, the highest ZT value is 0.0071. The study gives us a new way for the rapid and low-cost preparation of Full-Heusler thermoelectric materials.

关 键 词：热电 全赫斯勒合金 Fe_(2)TiSn 自蔓延高温燃烧合成(SHS) 

分 类 号：TG132.2[一般工业技术—材料科学与工程]