快速热压烧结法制备Bi2Te2.5Se0.5热电合金的特性分析.pdfVIP

HotWorkingTechnology2020,Vol.49,No.24

快速热压烧结法制备Bi2Te15SeQ.5热电合金的

特性分析

何军锋，娄本浊，尤德红，谭毅，徐永生

(陕西理工大学物理与电信工程学院，陕西汉中723001)

摘要：利用快速热压烧结法制备了Bi2TeZ5Sea5热电合金。通过XRD、SEM、四点探针法以及热电材料测试仪等分

析了合金试片的微观结构与热电性能。结果表明：二次热压烧结后合金内部的晶粒具有特殊的排列方向，这可增强其热

电性能。经二次热压烧结后，合金的室温电导率增至700S/cm,塞贝克系数维持在-200pV/K左右，故其室温功率因子

可增至2.9mW/(m_K2)。通过计算得出二次烧结后其热电优值在325〜425K时皆大于1。

关键词：热电材料;Bi2Te2.5Sea5合金；快速热压烧结；微观结构；热电性能

DOI:10.14158/j.cnki.1001-3814.

中图分类号：TG132.2+4文献标识码：A文章编号：1001-3814(2020)24-0038-03

CharacteristicAnalysisofBiJeuSeasThermo-electricAlloys

PreparedbyRapidHot—pressSinteringMethod

HEJunfeng,LOUBenzhuo,YOUDehong,TANYi,XUYongsheng

(SchoolofPhysicsandTelecommunicationEngineering,ShaanxiUniversityofTechnology,Hanzhong723001,China)

Abstract：Bi2Te2.5Se〇.5thermo-electricalloyswerepreparedbyrapidhot-presssinteringmethodandthemicrostructure

andthermo-electricpropertyofthealloyspecimenswereanalyzedbyXRD,SEM,four-pointprobemethodand

thermo-electricmaterialtestinginstrument.Theresultsshowthatthegrainorientationinthealloyaftersecondaryhot-press

sinteringisspecial,whichcanenhanceitsthermo-electricproperty.Theroomtemperatureconductivityofthealloysincreases

to700S/cmaftersecondaryhot-presssintering,andtheSeebeckcoefficientcanbemaintainedat-200|xV/K,soitsroom

temperaturepowerfactorcanbeincreasedto2.9mW/(m-K2).Aftercalculation,thethermo-electricvaluesaftersecondary

hot-pr