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利用溶液法混合粉体并通过电场激活压力辅助烧结(FAPAS)方法制备了不同硅纳米线含量的Mg_2Si基复合热电材料,研究了硅纳米线的掺入及含量对基体材料热电性能的影响。结果表明:硅纳米线掺入后材料电导率大幅降低,塞贝克系数基本不变,热导率小幅降低。随着硅纳米线掺量增加,材料电导率降低,塞贝克系数稍有提高,热导率有升高趋势。硅纳米线掺量为0.1at%的样品在800 K时ZT值达到最高值0.5。
Mg_2Si-based composite thermoelectric materials with different content of silicon nanowires were prepared by solution mixing method and pressure-assisted sintering (FAPAS) by electric field. The effects of silicon nanowires incorporation and content on the thermoelectric properties of the matrix were investigated. The results show that the electrical conductivity of Si nanowires decreases drastically, the Seebeck coefficient remains unchanged and the thermal conductivity decreases slightly. With the increase of the content of silicon nanowires, the conductivity of the materials decreases, the Seebeck coefficient increases slightly and the thermal conductivity increases. At 800 K, the ZT value of silicon nanowire with the content of 0.1at% reached the highest value of 0.5.