快速凝固法制备ZrNiSn基Half-Heusler热电材料的微结构

doi:10.3724/SP.J.1077.2010.00569

无机材料学报 ›› 2010, Vol. 25 ›› Issue (6): 569-572.DOI: 10.3724/SP.J.1077.2010.00569

快速凝固法制备ZrNiSn基Half-Heusler热电材料的微结构

蔚翠, 朱铁军, 肖凯, 金吉, 沈俊杰, 杨胜辉, 赵新兵

(浙江大学材料系硅材料国家重点实验室, 杭州 310027)

收稿日期:2009-10-14 修回日期:2009-12-24 出版日期:2010-06-20 网络出版日期:2010-05-12
基金资助:
国家基础研究项目(2007CB607502); 国家 “863” 研究计划(2007AA03Z234); 国家自然科学基金(50731006);教育部博士点基金(20060335126)

Microstructure of ZrNiSn-base Half-Heusler Thermoelectric Materials Prepared by Melt-spinning

YU Cui, ZHU Tie-Jun, XIAO Kai, JIN Ji, SHEN Jun-Jie, YANG Sheng-Hui, ZHAO Xin-Bing

(State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China)

Received:2009-10-14 Revised:2009-12-24 Published:2010-06-20 Online:2010-05-12

摘要/Abstract

摘要： 通过悬浮熔炼的方法制备了half-Heusler热电材料Zr(Hf)NiSn(Sb)合金, 并进一步通过快速凝固来细化晶粒, 通过放电等离子烧结制备块材并测试其热电性能. X射线衍射分析表明获得了单相Half-Heusler化合物. 扫描电子显微观察发现, 快速凝固后的样品晶粒尺寸在500nm左右, 放电等离子烧结后晶粒尺寸并未明显长大. 同时观察到在晶粒的表面还分布了很多几十纳米尺寸的小晶粒. 快速凝固的样品与熔炼样品相比具有较高的电导率及载流子浓度, 据此推断在快速凝固过程中产生的纳米晶粒应为金属相. 快速凝固后的样品晶界散射增多, 因而具有较低的晶格热导率.

关键词: ZrNiSn, 快速凝固, 晶粒尺寸, 微结构

Abstract: Thermoelectric materials Zr(Hf)NiSn(Sb) alloys were prepared by levitation melting followed by melt- spinning to refine the microstructure, and then consolidated by spark plasma sintering for the property measurements. XRD analysis showed that the half-Heusler phases were obtained. The microstructures of the melt spun thin ribbons were studied by the scanning electron microscope and transmission electron microscope. The thin ribbons were in the size of a few hundreds nanometers which didn’t grow too much during the sintering process. Nanocrystals were found in the crystal grains. The carrier concentration increased for the melt-spinning samples compared with the levitation melting samples, indicating that the nanocrystals were metallic. The increasing boundary scattering after melt-spinning made the lattice thermal conductivity decrease.

Key words: ZrNiSn, rapid solidification, grain sizes, microstructure

中图分类号:

TB381

蔚翠, 朱铁军, 肖凯, 金吉, 沈俊杰, 杨胜辉, 赵新兵. 快速凝固法制备ZrNiSn基Half-Heusler热电材料的微结构[J]. 无机材料学报, 2010, 25(6): 569-572.

YU Cui, ZHU Tie-Jun, XIAO Kai, JIN Ji, SHEN Jun-Jie, YANG Sheng-Hui, ZHAO Xin-Bing. Microstructure of ZrNiSn-base Half-Heusler Thermoelectric Materials Prepared by Melt-spinning[J]. Journal of Inorganic Materials, 2010, 25(6): 569-572.

参考文献

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[8]Hasaka M, Morimura T, Sato H, et al. Thermoelectric properties of Ti_x(Hf_yZr_1-y)_1-xNiSn_0.998Sb_0.002 half-Heusler ribbons. J. Electron. Mater., 2009, 38(7): 1320-1325.

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快速凝固法制备ZrNiSn基Half-Heusler热电材料的微结构

Microstructure of ZrNiSn-base Half-Heusler Thermoelectric Materials Prepared by Melt-spinning

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