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首页> 外文期刊>ACS applied materials & interfaces >Enhanced Mechanical Properties of Na0.02Pb0.98Te/MoTe2 Thermoelectric Composites Through in-Situ-Formed MoTe2
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Enhanced Mechanical Properties of Na0.02Pb0.98Te/MoTe2 Thermoelectric Composites Through in-Situ-Formed MoTe2

机译：通过原位形成的Mote2增强Na0.02pb0.98te / Mote2热电复合材料的机械性能

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摘要

Lead telluride (PbTe) is one of the best thermoelectric materials in the intermediate temperature range, which shows great potential for waste heat recycling. However, its low strength and high brittleness limit its large-scale application because the thermoelectric device usually undergoes mechanical vibration, mechanical and/or thermal cycling, and thermal shock in service. In this study, the enhanced mechanical properties and thermoelectric properties of PbTe are realized simultaneously through introducing dispersive transition-metal dichalcogenide MoTe_(2) (molybdenum telluride). The in-situ-formed MoTe_(2) precipitations with a size in the range from 2 to 5 μm and the tight and smooth interface between the PbTe matrix and precipitates contribute to the obvious crack deflection, crack bridging, and pull-out of long grains, dissipating more energy during crack propagation and resulting in a tortuous propagation path. Because of the toughening and the dispersion strengthening effect, the compressive strength, bending strength, and fracture toughness of the sample with a composite amount of 1% are 109 MPa and 50 MPa and 0.65 MPa·m~(1/2), respectively, which are increased by about 37, 117, and 67% compared to the Na_(0.02)Pb_(0.98)Te matrix. Additionally, the in situ MoTe_(2) precipitates intensify the interface phonon scattering and thus decrease the lattice thermal conductivity. As a result, the Na_(0.02)Pb_(0.98)Te-1%MoTe_(2) sample achieves a maximum ZT value of 1.46 at 700 K, which is 11% higher than that of Na_(0.02)Pb_(0.98)Te without any MoTe_(2) nanoprecipitation.
机译：铅碲化铅（PBTE）是中间温度范围中最佳热电材料之一，其含量较大的废热回收潜力。然而，其低强度和高脆性限制了其大规模应用，因为热电装置通常经历机械振动，机械和/或热循环，以及在服务中的热冲击。在该研究中，通过引入分散过渡金属二甲基甲化物Mote_（2）（碲化钼）同时实现PBTE的增强的机械性能和热电性能。原位形成的Mote_（2）尺寸在2至5μm的范围内，PBTE矩阵与沉淀物之间的紧密和平滑界面的沉淀有助于显而易见的裂缝偏转，裂纹桥接和拉出长的晶粒，在裂缝传播期间散发更多能量，并导致曲折的传播路径。由于增韧且分散强化效果，复合量为1％的样品的压缩强度，弯曲强度和断裂韧性分别为109MPa和50MPa和0.65MPa·m〜（1/2），与NA_（0.02）PB_（0.98）TE矩阵相比，其增加约37,117％和67％。另外，原位Mote_（2）沉淀地加强了界面声子散射，从而降低了晶格导热率。结果，Na_（0.02）PB_（0.98）TE-1％MOTE_（2）样品在700 k下实现1.46的最大值<46，其比NA_（0.02）PB_高出11％（ 0.98）Te没有任何Mote_（2）纳米尺寸。

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  • 来源
    《ACS applied materials & interfaces》 |2019年第44期|共10页
  • 作者

    Ting Zhu; Hongyao Xie; Cheng Zhang; Xin Cheng; Jian Zhang; Pierre FerdinandPoudeu Poudeu; Gangjian Tan; Yonggao Yan; Wei Liu; Xianli Su; Xinfeng Tang;

  • 作者单位

    State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology;

    State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology;

    State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology;

    State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology;

    State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology;

    Laboratory for Emerging Energy and Electronic Materials Department of Materials Science and Engineering University of Michigan;

    State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology;

    State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology;

    State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology;

    State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology;

    State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学工业;
  • 关键词

    PbTe; in-situ-formed MoTelt; subgt; 2lt; /subgt; precipitate; mechanical properties; electric properties; thermal conductivity; themoelectric;

    机译：PBTE;原位形成的微型＆lt;亚＆gt;2＆lt;/ sub＆gt;沉淀;机械性能;电性能;导热率;主电;

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