研究了制备p型AgSn18SbTe20无铅热电材料的机械合金化(MA)结合放电等离子烧结(SPS)工艺，调查了MA过程中球磨时间和SPS温度对材料电热传输性能和热电优值的影响，分析了样品的物相和显微结构。研究表明，适当延长球磨时间和降低烧结温度，可以有效提高材料的热电性能。优化制备条件可以实现59%的性能提升，最佳条件(球磨12 h、SPS温度743 K)下制备的样品ZT值在723 K达到0.62。%Lead-free thermoelectric materials gain increasing attention for environmentally friendly power- generation applications derived from waste-heat sources. In this work, mid-temperature lead-free p-type AgSn18SbTe20 thermoelectric materials were fabricated by a process combining mechanical alloying (MA) and spark plasma sintering (SPS). Electrical conductivity, Seeback coefficient, power factor and thermal conductivity of the sintered samples were measured in the temperature range from 300 K to 723 K, and the thermoelectric figure of merit, ZT, values were calculated. The phase structures and morphologies of the samples were observed. The effects of milling time and sintering temperatures on thermoelectric properties were investigated. And the results show that properly prolonging milling time and decreasing sintering temperature can enhance thermoelectric performance of the materials. TheZT value can be enhanced by 59% through optimizing the processing parameters, resulting in a relatively highZT up to 0.62 at 723 K when the materials are milled for 12 h and sintered at 743 K.
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