论文部分内容阅读
Bi2Te3基半导体材料是目前室温下性能最好的热电材料,经过几十年的研究,块体Bi2Te3基材料的最高热电优值ZT一直徘徊在1左右。机械合金化是一种制备粉末材料的常用方法,能够将原始粉末通过球磨直接合成合金粉末,制备出熔炼法无法合成的材料,具有低成本的优势。采用机械合金化方法制备Bi2Te3系合金粉末,对其进行掺杂来提高性能,再在气氛保护下进行烧结,并系统研究各因素对材料热电性能的影响。当机械球磨在20h以上,在520℃温度下可以得到较好热电性能的块材。
Bi2Te3-based semiconductor materials are the best thermoelectric materials at room temperature. After decades of research, the highest thermoelectric figure of merit (ZT) of Bi2Te3-based bulk materials has been hovering around 1. Mechanical alloying is a commonly used method for preparing powder materials, which can directly synthesize alloy powder by ball milling to prepare the material which can not be synthesized by melting method, and has the advantages of low cost. The Bi2Te3 alloy powder was prepared by mechanical alloying method, doped to improve its performance, and then sintered under atmosphere protection. The effects of various factors on the thermoelectric properties were systematically studied. When the mechanical milling in more than 20h, at 520 ℃ temperature can get better thermoelectric properties of the block.