SiC/CoSb_3复合热电材料的制备及热电传输特性  

Synthesis and Thermoelectric Properties of SiC/CoSb_3 Composites

作　　者：李丽[1] 金松哲[1] 李敬锋[2] 隋涛[1] 

机构地区：[1]长春工业大学材料科学与工程学院,吉林长春130012 [2]清华大学材料科学与工程系新型陶瓷与精细工艺国家实验室,北京100084

出　　处：《稀有金属材料与工程》2007年第A02期398-400,共3页Rare Metal Materials and Engineering

基　　金：国家自然科学基金重大国际合作研究项目(50310353)

摘　　要：以Co、Sb粉体为原料,利用机械合金化(MA)和放电等离子烧结(SPS)法制备SiC/CoSb_3复合热电材料。采用X-射线衍射法确定机械合金化粉末和SPS烧结块体的相组成,用透射电子显微镜(TEM)观察粉体形貌和块体的显微结构。在300～800K范围内测量了复合热电材料的电阻率、塞贝克系数和功率因子,研究了纳米SiC颗粒的添加对复合材料热电性能的影响。研究结果表明,SiC颗粒的引入使复合材料的电阻率降低,功率因子提高。在680K时0.1vol%SiC/CoSb_3复合材料的功率因子比单相CoSb_3热电材料提高了约100μW/m·K^2。SiC/CoSb3 composites were prepared by mechanical alloying （MA） and spark plasma sintering （SPS）. The constituent phases of the samples were determined by X-ray diffraction and the microstructures of MA-derived powder and SPS-sintered bulk samples were observed by TEM. Electrical resistivity, Seebeck coefficient and power factor were measured in the temperature range from 300 K to 800 K. A small amount of nano-SiC dispersions into CoSb3 reduced both electrical resistivity and Seebeck coefficient. As a result, the power factor at 680 K of the CoSb3 sample containing 0.1 vol%SiC was increased by about 100 μW/m·K^2 if compared with pure CoSb3. The effects of incorporating SiC nano-particles into CoSb3 on its thermoelectric properties have been discussed.

关 键 词：热电性能 声子散射 CoSb3 SIC颗粒 

分 类 号：TB34[一般工业技术—材料科学与工程]