| 快淬和球磨时间对p型(Bi_(0.25)Sb_(0.75))_2Te_3合金热电性能的影响 |
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| 引用本文： | 王 磊,路清梅,张 忻,张久兴.快淬和球磨时间对p型(Bi_(0.25)Sb_(0.75))_2Te_3合金热电性能的影响[J].无机材料学报,2010,25(6):588-592. |
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| 作者姓名： | 王 磊 路清梅 张 忻 张久兴 |
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| 作者单位： | (北京工业大学 1. 新型功能材料教育部重点实验室; 2. 材料科学与工程学院, 北京100124) |
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| 基金项目： | 国家自然科学基金(50801002, 50271001); 北京市教委科技发展重点基金(KZ200310005001) |
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| 摘 要： | 通过快淬-机械球磨-放电等离子烧结工艺制备了p型(Bi0.25Sb0.75)2Te3块体热电材料.在300~523K温度范围内对其电导率、Seebeck系数和热导率进行了测试,并系统研究了快淬后球磨时间对合金热电性能的影响.研究结果表明,随着球磨时间的延长,样品的电导率呈先降后升的趋势,Seebeck系数变化并不明显,而热导率随球磨时间的延长逐渐下降.球磨20h的样品在室温下具有最高的热电优值,最大值达到0.96,机械抗弯强度达到91MPa.
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| 关 键 词： | 热电材料 快淬 机械球磨 放电等离子烧结 |
| 收稿时间： | 2009-10-14 |
| 修稿时间： | 2009-12-17 |
Effect of Spinning and Milling Time on Thermoelectric Properties of the p-type (Bi0.25Sb0.75)2Te3 Alloy |
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| Affiliation: | (1. Key Lab. of Advanced Functional Materials, Ministry of Education, Beijing University of Technology, Beijing 100124, China; 2. College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China) |
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| Abstract: | A series of p type bulk (Bi0.25Sb0.75)2Te3 thermoelectric materials were prepared by melt spinning-mechanical milling (MM) and spark plasma sintering (SPS). Electrical conductivity, Seebeck coefficient and thermal conductivity of the sintered samples were measured in the temperature range from 300K to 523K. The effects of milling time on thermoelectric properties were investigated in system. The results show that, with the extension of milling time, the electrical conductivity of the sample increases and then decreases, Seebeck coefficient changes little, while the thermal conductivity decreases with the increase of milling time. As a result, the bulk milled for 20h has the highest ZT value 0.96 at room temperature, meanwhile the bending strength reaches 91MPa. |
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| Keywords: | thermoelectric material melt spinning mechanical milling spark plasma sintering (SPS) |
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