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采用机械合金化和放电等离子烧结方法制备高性能AgPbSbTe热电材料,研究了制备工艺对材料热电性能的影响。结果表明,材料的物相组成和热电性能都受到机械合金化时间的影响;适当地控制放电等离子烧结工艺可以抑制晶粒长大,增加晶界散射,降低热导率。实验中得到AgPbSbTe热电材料的最大功率因子为18μW/K~2cm,最小热导率为1.1 W/m K。机械合金化(球磨4 h、转速350 r/m)并在673 K放电等离子烧结5 min,得到AgPbSbTe材料的最大热电优值ZT为1.2(700 K)。
The high performance AgPbSbTe thermoelectric materials were prepared by mechanical alloying and spark plasma sintering. The effects of preparation process on the thermoelectric properties of the materials were studied. The results show that the phase composition and the thermoelectric properties of the material are affected by the time of mechanical alloying. The proper control of the spark plasma sintering process can restrain grain growth, increase the grain boundary scattering and reduce the thermal conductivity. The experimental results show that the maximum power factor of AgPbSbTe thermoelectric material is 18μW / K ~ 2cm and the minimum thermal conductivity is 1.1W / mK. Mechanical alloying (ball milling 4 h, rotation speed 350 r / m) and plasma sintering at 673 K for 5 min. The maximum pyroelectric ZT of AgPbSbTe material is 1.2 (700 K).