硅酸盐学报

SiC/β-Zn4 Sb3复合热电材料的制备及性能

单位：1. 江苏大学材料科学与工程学院江苏镇江 212013 2. 西安交通大学材料科学与工程学院金属材料强度国家重点实验室西安 710049

分类号：TN3

出版年,卷(期):页码：2016,44(6):808-812

DOI：：10.14062/j.issn.0454-5648.2016.06.04

摘要：

采用真空熔融淬火结合等离子活化烧结工艺(PAS)制备SiC/β-Zn4Sb3 复合热电材料。对材料的相组成和显微结构分别进行X 射线衍射分析和扫描电子显微镜观察，并在300~700 K 范围内测量了电阻率、Seebeck 系数、热导率。结果表明，复合材料由SiC 和β-Zn4Sb3 两相组成，PAS 烧结过程中，β-Zn4Sb3 并没有发生相变，SiC 纳米粒子在β-Zn4Sb3 基体中随机分布。随着纳米SiC 含量增加，复合材料的电阻率逐渐增加，Seebeck 系数先增加后降低。当SiC 含量为1.0%(质量分数)、673 K 时，复合材料的热电优值(ZT)达到1.03，与单相β-Zn4Sb3 相比提高了37%。

SiC/β-Zn4Sb3 thermoelectric composites with different contents of SiC nanoparticles were prepared by a process of vacuum melting and quenching combined with plasma activated sintering (PAS). The phase compositions and microstructures of the materials were characterized by X-ray diffraction and scanning electron microscopy. The resistivity, the Seebeck coefficient and the thermal conductivity were measured at 300–700 K. The results show that the composite is composed of SiC and β-Zn4Sb3 phases, and there is no phase transition in the PAS process. The SiC nanoparticles are randomly distributed in β-Zn4Sb3matrix. The electrical transport properties of the composite indicate that the resistivity increases, and the Seebeck coefficient firstly increases and then decreases with the increase of SiC content. When the content of SiC is 1.0%, the thermoelectric figure of merit (ZT) is 1.03 at 673 K, which is increased by 37%, compared to that of single phase β-Zn4Sb3.

基金项目：

国家自然科学基金(51572111)资助。

作者简介：

张超(1991—)，男，硕士研究生。

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