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利用高分子网络凝胶法和放电等离子烧结技术(SPS)制备出高致密的Ca3Co4O9/Ag热电陶瓷复合材料。采用X射线衍射法表征了材料的相组成及其织构化程度,用SEM观察了粉体形貌和陶瓷断口的显微结构,并研究了Ag复合量对材料的室温热电性能的影响。研究结果表明,利用高分子网络凝胶法和SPS相结合的工艺有利于单质Ag在基体中的分布,使得基体中Ag相的粒径更小,分布更均匀。陶瓷复合材料的致密度均达到98%以上。虽然Ag颗粒的加入使Ca3Co4O9/Ag复合材料的Seebeck系数降低,但由于电导率显著提高,从而使材料的功率因子提高。
High-density Ca3Co4O9 / Ag thermoelectric ceramic composites were prepared by polymer network gel method and spark plasma sintering (SPS). The phase composition and the degree of texturing of the material were characterized by X-ray diffraction. The morphology of the powder and the microstructure of the ceramic fracture were observed by SEM. The effect of Ag content on the room temperature thermoelectric properties of the material was also studied. The results show that the combination of polymer network gel method and SPS is conducive to the distribution of elemental Ag in the matrix, making the matrix Ag particle size smaller and more evenly distributed. Ceramic composites have a density of more than 98%. Although the addition of Ag particles decreased the Seebeck coefficient of Ca3Co4O9 / Ag composite, the power factor of the material increased due to the significant increase of conductivity.