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利用区熔法、机械合金化、放电等离子烧结(SPS)技术、热压法等多种工艺制备了p型碲化铋基热电材料.在300—500K的温度范围内测量了各热电性能参数,包括电导率(σ)、塞贝克系数(α)和热导率(κ),研究了制备工艺对热电性能的影响.结果表明,所制备的块体材料与同组成区熔晶体相比,性能优值ZT均有不同程度的提高.其中,利用区熔法结合SPS技术可获得热电性能最佳的块体材料,其ZT值达1.15.
The p-type bismuth telluride-based thermoelectric materials were prepared by zone melting, mechanical alloying, spark plasma sintering (SPS) and hot pressing methods, etc. The thermoelectric performance parameters were measured in the temperature range of 300-500K, Including the electrical conductivity (σ), the Seebeck coefficient (α) and the thermal conductivity (κ), and the influence of the preparation process on the thermoelectric properties was studied.The results show that compared with the same composition zone, The ZT value of the highest value is improved to some extent.Among them, ZT value of 1.15 can be obtained by using zone melting method combined with SPS technology.