Bi_2Te_3基制冷晶棒加工废粉料的回收与热电性能的优化  

Recycling and thermoelectric properties optimization of processing waste powders of Bi_2Te_3 based refrigerating crystal bar

作　　者：韩学武[1,2] 樊希安[1,2] 张城诚 蔡新志[1,2] 项求胜 胡杰[1,2] 

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,武汉430081 [2]武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉430081

出　　处：《粉末冶金材料科学与工程》2017年第1期41-48,共8页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金面上项目(11074195;51674181);武汉市黄鹤英才项目;湖北省教育厅重点项目(D20151103)

摘　　要：针对半导体制冷行业P型Bi_2Te_3基制冷晶棒的生产与加工过程中产生的废粉料,经过真空煅烧、1次熔炼及2次熔炼除去粉料中的杂质,获得Bi_2Te_3基粉末,然后加压烧结,制备P型Bi_2Te_3基块体材料,测定材料的热电性能,并通过在除杂后的Bi_2Te_3基粉末中加入单质Sb和Te,进行成分优化。结果表明,废粉料的回收率达到85.73%以上,采用废粉料制备的P型块体Bi0.53Sb1.3Te3合金在室温下的电导率仅为331.79 S/cm,热电优值为0.75。在除杂后的废粉料中加入单质Sb和Te后制备的Bi0.36Sb1.64Te3合金在室温下的电导率达到970 S/cm,热电优值为1.13,350 K下的热电优值为1.23,并且在300~470 K温度范围内的热电优值都超过1.0,性能超过了采用高纯原材料生产的P型区域熔炼产品,能够满足生产企业的要求。Starting from the processing waste powders of Bi2Te3 based refrigerating crystal bar, the Bi2Te3-based materials were obtained by impurity removal treatment of vacuum-calcination, primary smelting and secondary smelting. Subsequently, P-type BiETe3 based bulks were prepared by compression sintering and their thermoelectric properties were investigated in detail. And the component optimization was carried out by adding elementals Sb and Te. The results show that the recovery rate of waste powder can reach 85.73%. The conductivity and the figure of merit （ZT） value of P-type Bi0.53Sb1.3Te3 bulks with no composition optimization arc only 331.79 S/cm and 0.75 at room temperature, respetively. The conductivity of P-type Bi0.36Sb1.64Te3 bulks by adding elementals Sb and Te can reach 970 S/cm. The figure of merit （ZT） values reach 1.13 and 1.23 at room temperature and 350 K, respectively. The ZT value is over 1.0 in the whole temperature range of 300-470 K, which exceeds the properties of P-type zone melting products prepared from high purity raw materials and can meet the production requirements of enterprises.

关 键 词：半导体制冷 Bi2Te3基合金 加工废料 整体回收 热电材料 热电性能 

分 类 号：TB64[一般工业技术—制冷工程]