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微波輔助MgH2固相反應(yīng)法制備Mg2Si1-xSnx基熱電材料及性能研究
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太原理工大學(xué),太原理工大學(xué),太原理工大學(xué),太原理工大學(xué),太原理工大學(xué),太原理工大學(xué),寧波工程學(xué)院材料工程研究所

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中圖分類號:

TBTB34

基金項目:

國家自然科學(xué)基金資助（項目號51101111），山西省回國留學(xué)人員科研資助項目（項目號 2012-031 ）


Fabrication and thermoelectric performance on Mg2Si1-xSnx prepared from MgH2 by microwave-assisted solid state reaction
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Taiyuan University of Technology,Taiyuan University of Technology,Taiyuan University of Technology,Taiyuan University of Technology,Taiyuan University of Technology,Taiyuan University of Technology,.Institute of Materials Engineering, Ningbo University of Technology

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    摘要:

    在微波作用下利用MgH2 、納米 Si粉 、Sn粉和Bi粉進行固相反應(yīng)，結(jié)合電場激活壓力輔助合成法（FAPAS）制備了高純Bi摻雜的Mg2Si1-xSnx（0.4≦x≦0.6）基固溶體熱電材料，并對其微觀結(jié)構(gòu)和熱電性能進行了表征。研究結(jié)果表明，MgH2替代傳統(tǒng)原料Mg粉顯著降低了固相反應(yīng)溫度且防止了Mg的揮發(fā)和氧化，同時微波快速低溫加熱有效抑制晶粒長大，可獲得平均晶粒尺寸為200nm的高純產(chǎn)物。在300-750K的溫度區(qū)間對樣品熱電性能進行測試，結(jié)果表明細小的片層固溶體組織和Bi的摻雜有效降低了樣品熱導(dǎo)率，同時改善了其電性能，在600K時，含1.5at%Bi的Mg2Si0.4Sn0.6熱電材料具有最大ZT值0.91。

    Abstract:

    The synthesis of Bi dopped Mg2Si1-xSnx (0.4≦x≦0.6) solid solution thermoelectric materials with high purity was achieved by microwave-assisted solid state reaction followed by the field activated and pressure assisted synthesis (FAPAS), and its microstructure and transport properties were observed and evaluated. It indicates that the replacement of Mg used in traditional processes by MgH2 powder significantly reduces the temperature of the solid state reaction and further inhibits the oxidation and volatilization of magnesium. Meanwhile, the low-temperature and rapid heating from microwave restrain the grain growth effectively; as a result the pure product with an average grain size of 200nm has been reached. Thermoelectric performance was tested in the temperature range of 300-750K. It indicates that the solid solution with fine lamellar structure and the doping of Bi significantly lower the thermal conductivity and improve the electric properties simultaneously. The 1.5at.% Bi doped Mg2Si0.4Sn0.6 got the maximum ZT of 0.91 at 600K.

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王彥坤,陳少平,樊文浩,張華,孟慶森,楊江峰,崔教林.微波輔助MgH2固相反應(yīng)法制備Mg2Si1-xSnx基熱電材料及性能研究[J].稀有金屬材料與工程,2016,45(3):755~759.[wangyankun, chenshaoping, fanwenhao, zhanghua, mengqingsen, yangjiangfeng, cuijiaolin. Fabrication and thermoelectric performance on Mg2Si1-xSnx prepared from MgH2 by microwave-assisted solid state reaction[J]. Rare Metal Materials and Engineering,2016,45(3):755~759.]
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  • 收稿日期:2014-03-31
  • 最后修改日期:2014-05-05
  • 錄用日期:2014-05-15
  • 在線發(fā)布日期: 2016-07-06
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