Spark plasma sintered bismuth telluride-based thermoelectric materials incorporating dispersed boron carbide

JOURNAL OF ALLOYS AND COMPOUNDS

卷:626

Article

Williams, H. R.¹  Ambrosi, R. M.²  Chen, K.³  Friedman, U.¹  Ning, H.³  Reece, M. J.³  Robbins, M. C.⁴  Simpson, K.⁴  Stephenson, K.⁵ 

[1] Univ Leicester, Dept Engn, Leicester LE1 7RH, Leics, England

[2] Univ Leicester, Dept Phys & Astron, Space Res Ctr, Leicester LE1 7RH, Leics, England

[3] Univ London, Sch Engn & Mat Sci, London E1 4NS, England

[4] European Thermodynam Ltd, Kibworth LE8 0R, Leics, England

[5] European Space Agcy, ESTEC TEC EP, NL-2201 AZ Noordwijk, Netherlands

关键词: Thermoelectric materials;    Sintering;    Mechanical properties;   

DOI  :  10.1016/j.jallcom.2014.12.010

来源: Elsevier

【 摘 要 】

The mechanical properties of bismuth telluride based thermoelectric materials have received much less attention in the literature than their thermoelectric properties. Polycrystalline p-type Bi0.5Sb1.5Te3 materials were produced from powder using spark plasma sintering (SPS). The effects of nano-B4C addition on the thermoelectric performance, Vickers hardness and fracture toughness were measured. Addition of 0.2 vol% B4C was found to have little effect on zT but increased hardness by approximately 27% when compared to polycrystalline material without B4C. The K-IC fracture toughness of these compositions was measured as 0.80 MPa m(1/2) by Single-Edge V-Notched Beam (SEVNB). The machinability of polycrystalline materials produced by SPS was significantly better than commercially available directionally solidified materials because the latter is limited by cleavage along the crystallographic plane parallel to the direction of solidification. (C) 2014 Elsevier B.V. All rights reserved.

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