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以机械合金化法(MA)结合放电等离子烧结技术(SPS)制备了Bi_2S_3多晶块体热电材料.研究了MA过程中干磨转速、湿磨时间和湿磨介质对Bi_2S_3多晶热电材料电传输性能的影响.分析了样品的物相,观察了显微组织,测试了电传输性能和热传输性能.研究表明,以无水乙醇为湿磨介质时,随着湿磨时间的延长,出现了微量Bi_2O_3第二相,样品的晶粒尺寸减小,电阻率大幅增加,功率因子下降.以丙酮为湿磨介质时,虽然不存在微氧化反应,但是由于样品中存在大量孔洞,导致功率因子降低.425 r/min干磨15 h后未湿磨的样品在573 K取得最大的ZT值0.25,是目前文献报道的最高值.
The Bi_2S_3 polycrystalline bulk thermoelectric materials were prepared by mechanical alloying (MA) combined with spark plasma sintering (SPS). The effects of dry milling speed, wet grinding time and wet milling media on the electrical transmission of Bi_2S_3 polycrystalline thermoelectric materials The phase of the sample was analyzed, the microstructure was observed, and the electrical transmission performance and the heat transfer performance were tested.The results show that with the wet milling time, ethanol In the second phase of trace Bi_2O_3, the grain size decreases, the resistivity increases sharply, and the power factor decreases.When acetone is used as the wet grinding medium, there is no micro-oxidation reaction, but due to the large number of pores in the sample, the power factor decreases .425 r / min dry grinding after 15 h did not wet the sample obtained at 573 K maximum ZT value of 0.25, is the highest reported in the literature.