β-Zn4Sb3是一种重要的中温热电材料, 但其较差的力学强度和可加工性限制了其实际应用. 本文采用熔体旋甩法结合放电等离子烧结技术快速制备了一系列具有高热电性能和高力学强度的β-Zn4+xSb3块体材料. 通过调节Zn的含量, 优化了其热电性能, 随着Zn含量的增加, 电导率增大, Seebeck系数有所下降, 热导率增加. 在700K时, Zn4.32Sb3样品的ZT值达到1.13, 相比熔融法制备的样品提高了约40%. 该制备方法所得到的样品具有极高的抗压强度, 与熔融法制备的样品相比较, 所有样品的抗压强度均提高了一倍以上, 这种高热电性能和高力学强度的β-Zn4+xSb3块体材料具有很好的应用前景.
β-Zn4Sb3 is one of the most important thermoelectric materials in the intermediate temperature range, while the poor mechanical properties limit its commercial application. A series of β-Zn4+xSb3 bulk materials with high thermoelectric performance and high mechanical properties were fabricated by a melt spinning (MS) technique followed by a quick spark plasma sintering (SPS) procedure. By adjusting the stoichiometric ratio of Zn and Sb, we optimize the thermoelectric performance of this series of bulk materials. With increasing the amount of Zn, electrical and thermal conductivities of the sample increase, and the Seebeck coefficient declines. The ZTmax is 1.13 at 700K for the Zn4.32Sb3 sample, compared with the M-ingot sample it increases by 47% at the same temperature. The samples prepared by MS-SPS method have much better mechanical properties compared with the samples prepared by traditional melting and SPS method. The pressive strength of MS-SPS samples was nearly twice of that of the sample prepared by melting method. This kind of high performance and high mechanical strength β-Zn4+xSb3 bulk material has great potential for commercial application.
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