Microstructure control and thermoelectric properties improvement to n-type bismuth telluride based materials by hot extrusion

被引：0
|
作者：
Yang, Junyou [1 ]
Chen, Rougang [1 ]
Fan, Xi'an [1 ]
Zhu, Wen [1 ]
Bao, Siqian [1 ]
Duan, Xingkai [1 ]
机构：
[1] State Key Laboratory for Plastic Forming Simulation and Dies Technology, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, Hubei 430074, China
来源：
Journal of Alloys and Compounds | 1600年 / 429卷 / 1-2期
关键词：
In this paper; hot extrusion process of Bi2Te3 based thermoelectric materials was simulated with FEM tools firstly; it is found that the friction condition between the extrusion die and the sample has large influence on the surface stress state of the sample; making the surface region under more tension stress; thus increases the possibility of surface crack. Extrusion ratio has significant influence on the degree of deformation. Extrusion angle also shows effect on the deformation; low extrusion angle die has longer or larger regions of deformation; which means lower deformation rate and will cause less micro-pores. Then n-type Bi2Te3 based materials were also hot extruded under different experiment conditions; and effect of extrusion parameters on microstructure and thermoelectric properties of the materials was studied; and a (0 0 l) preferred orientation microstructure was formed in the hot extruded samples. With increasing the extrusion ratio; the Lotgering orientation factor of the extruded sample increases; and the power factor also shows a magnificent increase. The experimental results are in consistence with the results of FEM analysis. © 2006 Elsevier B.V. All rights reserved;
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页码：156 / 162
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