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如何有效控制方钴矿基热电材料的制备成本成为其商业化应用的瓶颈。本课题组采用一种简单并且可放量的方法来制备n型填充方钴矿热电材料。该法由感应熔融淬、火和放电等离子烧结(SPS)组成,制备周期(少于30 min)远小于传统制备方法:电阻炉熔融(超过24 h),退火(1 w)和SPS。该法同传统制备工艺相当,制备的方钴矿块体材料具有相对均匀的物相成份和组织结构,以及良好的热电性能,这得益于将经历感应熔融、淬火冷凝工艺形成的Sb/CoSb/CoSb_2包晶偏析结构破坏,能同时实现快速反应和致密化。良好的热电性能和较少的生产周期及能耗,使该法有望发展成为具有潜在应用前景的填充方钴矿热电材料工业化制备工艺。
How to effectively control the cost of preparing the cobalt-based thermoelectric material has become the bottleneck of its commercial application. Our group adopted a simple and gravimetric method to prepare n-filled skutterudite thermoelectric materials. The method consists of induction melt quenching, spark plasma and spark plasma sintering (SPS). The preparation cycle (less than 30 min) is much smaller than the traditional preparation methods: resistance furnace melting (over 24 h), annealing (1 w) and SPS. The method is equivalent to the traditional preparation process, and the prepared skutterudite material has a relatively uniform phase composition and structure as well as good thermoelectric properties due to the properties of Sb / CoSb formed by induction melting and quenching and condensation processes / CoSb_2 peritectic segregation structure destruction, can simultaneously achieve rapid reaction and densification. Good thermoelectric properties and less production cycle and energy consumption make this method promising to be an industrialized preparation process for filled skutterudite thermoelectric materials with potential applications.