您的位置:首页  > 论文页面

Bi2Te3/纳米SiC材料的热电和力学性能研究

发表时间:2016-12-31  浏览量:1377  下载量:427
全部作者: 裴延玲,赵博伦
作者单位: 北京航空航天大学材料科学与工程学院
摘 要: 为改善Bi2Te3的热电和力学性能,采用机械合金化(mechanical alloying,MA)和放电等离子烧结(spark plasma sintering,SPS)技术制备出纳米SiC弥散分布的SiC/Bi2Te3块体材料。随着SiC含量的增多,相应提高SPS温度使材料的致密度保持一致。在693 K SPS温度下,含0.1%SiC试样的功率因子从纯Bi2Te3的1.72×10-3 W·m-1·K-2增加到约1.96×10-3 W·m-1·K-2,提高了14.0%. SiC含量增加到1.0%,SPS温度相应提高到733 K,发现升高SPS温度减小了材料中的施主缺陷,降低了电导率和功率因子。SiC/Bi2Te3的显微硬度由纯Bi2Te3的0.62 GPa提高到0.86 GPa. 综合实验结果表明,通过控制SPS温度和少量纳米SiC颗粒分散可以提高Bi2Te3的电传输和力学性能。
关 键 词: 特种功能无机非金属材料;Bi2Te3;热电材料;机械合金化;放电等离子烧结;纳米SiC
Title: Thermoelectric and mechanical properties of Bi2Te3/nano-SiC
Author: PEI Yanling, ZHAO Bolun
Organization: School of Materials Science and Engineering, Beihang University
Abstract: To improve the thermoelectric and mechanical property of Bi2Te3 alloys, highly dense n-type Bi2Te3 materials dispersed with nano-SiC are fabricated by mechanical alloying (MA) and spark plasma sintering (SPS), in which their relative densities are invariable by increasing the SPS temperature according to the SiC dispersed contents. The power factor increases from 1.72×10-3 W·m-1·K-2 for monolithic Bi2Te3 to 1.96×10-3 W·m-1·K-2 for 0.1%SiC dispersed sample at 693 K with increase by 17.6%. But as nano-SiC content increases to 1.0% and SPS temperature raises to 733 K, the increase of SPS temperature reduces the donor defect and decreases electric conductivity and power factor. The Vickers hardness increases from 0.62 GPa for monolithic Bi2Te3 to 0.86 GPa for 1.0%SiC dispersed sample. The results show that thermoelectric and mechanical properties of Bi2Te3 alloys can be improved by optimizing both and SPS temperature nano-SiC content.
Key words: special functional inorganic nonmetallic materials; Bi2Te3; thermoelectric material; mechanical alloying; spark plasma sintering; nano-SiC
发表期数: 2016年12月第24期
引用格式: 裴延玲,赵博伦. Bi2Te3/纳米SiC材料的热电和力学性能研究[J]. 中国科技论文在线精品论文,2016,9(24):2525-2531.
 
0 评论数 0
暂无评论
友情链接