中文摘要：

用机械合金化工艺（MA）和放电等离子烧结工艺（SPS），制备出纳米SiC（平均直径约30nm）弥散分布的Bi2Te3热电材料，并研究了纳米SiC颗粒弥散对Bi2Te3性能的影响。实验采用MA合成纳米SiC分散Bi2Te3粉末，用SPS制备块体材料。XRD分析表明用MA和SPS成功制备了Bi2Te3合金，随着纳米SiC含量的增加，材料的颗粒尺寸减小，表明纳米SiC有抑制颗粒长大的作用。电学性能测试发现少量（体积分数≤1．0％）纳米SiC的加入对Bi2Te3电学性能有很大影响：虽然随着SiC含量的增加电导率有所降低，但Seebeck系数得到了提高。当加入0．1％SiC时，Seebeck系数和功率因子达到最大值，均高于纯Bi2Te3试样，随着SiC含量进一步增加，Seebeck系数和功率因子降低。显微硬度随着纳米SiC含量的增加也得到提高。综合实验结果表明极少量纳米SiC颗粒的加入可以提高Bi2Te3的电学性能和力学性能。

英文摘要：

Nano-SiC （30 nm） dispersed Bi2Te3 alloys were fabricated by mechanical alloying （MA） and spark plasma sintering （SPS） to enhance thermoelectric and mechanical properties with special emphasis on the effect of nano-SiC content. The powders of Bi2Te3 dispersed with nano-SiC were firstly synthesized by MA and then consolidated by SPS. The XRD results indicated that Bi2Te3 alloys were synthesized successfully. The grain size of Bi2Te3 decreased with increasing SiC content, suggested that the dispersion of nano-SiC particles effectively suppressed the grain growth of Bi2Te3. When a small amount of nano-SiC （≤ 1.0 vol% ） was added in Bi2Te3 alloys, the electrical conductivity decreased slightly but the Seebeck coefficient increased. The maximum values of Seebeck coefficient and power factor were obtained as 0.1 vol% SiC was added. The Vickers hardness was also improved by adding nano-SiC. The addition of a small amount of nano-SiC is effective to enhance both the electrical and mechanical properties of Bi2Te3 alloys.