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Thermal expansion and Thermal stress: Problem Solving01:27

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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
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Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
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Updated: May 5, 2026

Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation
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开发热电接口材料的选策略

Liangjun Xie1, Li Yin2, Yuan Yu3

  • 1State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China.

Science (New York, N.Y.)
|November 23, 2023
PubMed
概括
此摘要是机器生成的。

使用相图预测的新策略将MgCuSb确定为高性能发电机的稳定热电接口材料. 这种方法超越了试错方法,使高效的热电设备可靠地开发.

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科学领域:

  • 材料科学
  • 固态物理
  • 能源转换

背景情况:

  • 热电发电机需要稳定的接口材料来有效地转换能量.
  • 目前的热电接口材料 (TEiM) 通常缺乏性能稳定性.
  • 传统的TEiM选择在很大程度上依赖于经验,试错实验.

研究的目的:

  • 为可靠的热电接口材料 (TEiM) 制定预测选策略.
  • 确定基于MgAgSb的高性能热电器的稳定TEiM.
  • 在加速材料发现方面展示计算方法的有效性.

主要方法:

  • 用于相图预测的密度函数理论 (DFT) 计算.
  • 将相图数据与电阻和点分析相结合.
  • 使用选定的TEiM进行热电模块的实验制造和测试.

主要成果:

  • 确定MgCuSb为MgAgSb的可靠TEiM,在长时间的高温回火后显示稳定性.
  • 在MgCuSb/MgAgSb连接处达到较低的界面接触电阻 (<1微hm cm2).
  • 在300K温度梯度下制造了一种具有9.25%转换效率的热电模块.

结论:

  • 基于DFT的阶段图选策略可以有效地识别稳定的TEiM.
  • 在高性能热电应用中,MgCuSb是一个有前途的TEiM.
  • 开发的战略可以广泛应用于推进热电材料的开发.