Thermoelectric and mechanical properties of nano-SiC-dispersed Bi2Te3 fabricated by mechanical alloying and spark plasma sintering
Thermoelectric and mechanical properties of nano-SiC-dispersed Bi2Te3 fabricated by mechanical alloying and spark plasma sintering
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DOI：
10.1016/j.jallcom.2007.01.015
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发表时间：
2008-05
影响因子：
6.2
通讯作者：
Li-dong Zhao;Boping Zhang;Jingfeng Li;Min Zhou;Weishu Liu;Jing Liu
中科院分区：
文献类型：
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作者：
Li-dong Zhao;Boping Zhang;Jingfeng Li;Min Zhou;Weishu Liu;Jing Liu
采用机械合金化（MA）和放电等离子烧结（SPS）方法制备了掺杂xvol%（x=0，0.1，0.5，1.0）纳米SiC颗粒的高密度n型Bi 2 Te 3热电材料。研究了纳米SiC的加入对热电性能和力学性能的影响。在323- 523 K的温度范围内，与Bi 2 Te 3基体相比，纳米SiC的掺杂使Bi 2 Te 3材料的Seebeck系数增大，电导率降低，热导率也降低。在423 K时，最大无量纲优值（ZTmax）由Bi_2Te_3样品的0.99提高到0.1vol%SiC分散Bi_2Te_3样品的1.04。当SiC含量为1.0vol%时，合金的维氏硬度从0.62 GPa线性增加到0.79GPa。当SiC含量为0.1vol%时，试样的断裂韧性最高，为1.34MPam ~（1/2）;当SiC含量为0.5vol%时，试样的杨氏模量最高，为42.7GPa。
Highly dense n-type Bi2Te3dispersed with xvol% nano-SiC particles (x=0, 0.1, 0.5, 1.0) thermoelectric materials were fabricated by mechanical alloying (MA) and spark plasma sintering (SPS) method. The effects of nano-SiC addition on the thermoelectric and mechanical properties were studied. Compared with Bi2Te3matrix, Bi2Te3materials dispersed with nano-SiC show increased Seebeck coefficient, decreased electrical conductivity, and reduced thermal conductivity as well in the measured temperature range of 323–523K. The maximum dimensionless figure of merit (ZTmax) was improved from 0.99 for Bi2Te3sample to 1.04 for 0.1vol% SiC dispersed Bi2Te3sample at 423K. The Vickers hardness increased linearly from 0.62 to 0.79GPa as 1.0vol% SiC was added. The highest fracture toughness of 1.34MPam1/2was obtained for 0.1vol% SiC addition, and the highest Young's modulus of 42.7GPa was obtained for 0.5vol% SiC added sample.