| 机械合金化过程对硫化铋块体热电性能的影响机理 |
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| 引用本文： | 葛振华,张波萍,于昭新,刘勇,李敬锋. 机械合金化过程对硫化铋块体热电性能的影响机理[J]. 物理学报, 2012, 61(4): 48401-048401 |
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| 作者姓名： | 葛振华 张波萍 于昭新 刘勇 李敬锋 |
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| 作者单位： | 1. 北京科技大学材料科学与工程学院 北京市新能源材料与技术重点实验室,北京,100083
2. 清华大学材料科学与工程系 新型陶瓷与精细制备工艺国家重点实验室,北京,100084 |
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| 基金项目： | 国家自然科学基金(批准号: 50972012), 国家高技术研究发展计划(863计划)(批准号: 2009AA03Z216 ), 国家重点基础研究发展计划(973计划)(批准号: 2007CB607500)和北京市自然科学基金(批准号: 2112028)资助的课题. |
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| 摘 要： | 以机械合金化法(MA)结合放电等离子烧结技术(SPS)制备了Bi2S3多晶块体热电材料. 研究了MA过程中干磨转速、湿磨时间和湿磨介质对Bi2S3多晶热电材料电传输性能的影响. 分析了样品的物相, 观察了显微组织, 测试了电传输性能和热传输性能. 研究表明, 以无水乙醇为湿磨介质时, 随着湿磨时间的延长, 出现了微量Bi2O3第二相, 样品的晶粒尺寸减小, 电阻率大幅增加, 功率因子下降. 以丙酮为湿磨介质时, 虽然不存在微氧化反应, 但是由于样品中存在大量孔洞, 导致功率因子降低. 425 r/min 干磨15 h后未湿磨的样品在573 K取得最大的ZT值0.25, 是目前文献报道的最高值.
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| 关 键 词： | 机械合金化过程 Bi2S3 热电材料 微氧化 |
| 收稿时间： | 2011-05-13 |
Effects of mechanical alloying process on thermoelectric properties of Bi2S3 Bulk |
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| Ge Zhen-Hu,Zhang Bo-Ping,Yu Zhao-Xin,Liu Yong and Li Jing-Feng. Effects of mechanical alloying process on thermoelectric properties of Bi2S3 Bulk[J]. Acta Physica Sinica, 2012, 61(4): 48401-048401 |
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| Authors: | Ge Zhen-Hu Zhang Bo-Ping Yu Zhao-Xin Liu Yong Li Jing-Feng |
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| Affiliation: | Beijing Key Lab of New Energy Materials and Technology, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;Beijing Key Lab of New Energy Materials and Technology, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;Beijing Key Lab of New Energy Materials and Technology, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;Beijing Key Lab of New Energy Materials and Technology, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | Bismuth sulfide (Bi2S3) polycrystalline bulks are fabricated by spark plasma sintering (SPS) combined with a mechanical alloying (MA) process. The electrical transport properties are investigated with a special emphasis on dry-milling speed, wet-milling time and mediums in MA process. The phase structure, the microstructure, and the electrical/thermal transport properties for the bulk samples are measured. The results suggest that the second Bi2O3 phase is formed because of the micro-oxidation when the wet medium is fixed to absolute ethyl alcohol, which refines the grain sizes and affects electrical transport properties of the bulk samples. Prolonging the wet-milling time in absolute ethyl alcohol causes the increase of resistivity and the decrease of the power factor. The electrical transport properties degrade due to the porous microstructure in bulk samples even without oxidization as the acetone is used as a milling medium. The largest ZT value 0.25 is obtained at 573 K for the samples dry-milled under 425 r/min for 15 h without wet-milling, which is the highest value in the reported values so far. |
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| Keywords: | mechanical alloying process Bi2S3 thermoelectric micro oxidation |
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