Annealing and sintering effects in thermoelectric skutterudites synthesized by gas atomization
Annealing and sintering effects in thermoelectric skutterudites synthesized by gas atomization
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DOI：
10.1002/pssa.201532539
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发表时间：
2016-03
期刊：
影响因子：
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通讯作者：
A. Schmitz;C. Schmid;C. Stiewe;J. de Boor;E. Müller
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文献类型：
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作者：
A. Schmitz;C. Schmid;C. Stiewe;J. de Boor;E. Müller
基于CoSb 3的方钴矿是用于中温范围内的发电机应用的最佳热电材料之一。尽管如此，为了适合广泛的应用，仍然需要低成本制造大量这种材料的方法。可能满足这些要求的工艺是气体雾化加连续短期烧结。由于通过雾化产生的粉末通常不是单相方钴矿材料，因此烧结的后续过程以及最终在烧结之前的退火对于所得材料的热电性能起重要作用。在这项工作中，我们研究了粉末退火和烧结对气体雾化合成的铟填充方钴矿性质的影响。的相组成和热电性能作为烧结温度的函数进行了研究。此外，中间退火步骤之前，烧结的影响进行了研究。显示在约450 °C的温度下的短烧结时间足以从雾化粉末获得致密单相方钴矿材料，而对于退火的方钴矿粉末，致密样品需要高于550 °C的烧结温度。此外，烧结温度和退火被证明有强烈的影响的材料的微观结构和热电性能。
Skutterudites on the basis of CoSb3 are among the best thermoelectric materials for generator applications in the intermediate temperature range. Still, to be suitable for a wide range of applications methods for low cost fabrication of large amounts of this material are needed. A process potentially fulfilling these requirements is gas atomization plus consecutive short‐term sintering. As the powder produced by atomization is usually not single phase skutterudite material, the subsequent processes of sintering and eventually annealing prior to sintering play an important role for the resulting material's thermoelectric properties. In this work, we investigate the influence of powder annealing and sintering on the properties of indium‐filled skutterudites synthesized by gas atomization. The phase composition and thermoelectric properties are investigated as functions of the sintering temperature. Furthermore, the influence of an intermediate annealing step prior to sintering is investigated. It is shown short sintering times at temperatures around 450 °C are sufficient to achieve dense single phase skutterudite material from atomized powder whereas for annealed skutterudite powder sintering temperatures higher than 550 °C are needed for dense samples. Furthermore, sintering temperature and annealing are shown to have strong influences on the microstructure and thermoelectric properties of the material.