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相关概念视频

Mechanism of heat transfer01:19

Mechanism of heat transfer

Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...

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接口的动力操纵使高效和可靠的Mg3Sb2热电学成为可能.

Yuntian Fu1, Xin Ai2, Zhongliang Hu1

  • 1State Key Laboratory for Modification of Chemical Fibers and Polymer, Materials & College of Materials Science and Engineering, Donghua University, Shanghai, China.

Nature communications
|October 30, 2024
PubMed
概括

研究人员为抗氧化热电发电机开发了一层薄膜屏障层. 这项创新大大减少了接口损失,将模块效率提高到11%,并使可持续的废热回收成为可能.

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Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
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科学领域:

  • 材料科学 材料科学 材料科学
  • 能源转换 能源转换
  • 固态物理 固态物理

背景情况:

  • 热电发电机 (TEG) 对可持续能源至关重要,但材料和电极之间的接口问题限制了它们的效率和可靠性.
  • 目前创建屏障层的方法经常忽视界面反应和扩散的动力学,而是依赖热力学平衡.
  • 需要有效的屏障层来减轻损失和防止热电器件的故障.

研究的目的:

  • 开发一种新的介面屏障层,用于基于抗氧化物 (Mg3Sb2) 的热电材料.
  • 通过考虑反应和扩散动力学来解决现有的屏障层方法的局限性.
  • 提高热电发电机用于废热回收的效率和长期稳定性.

主要方法:

  • 使用 (Ti) 作为Mg3Sb2热电材料的屏障层.
  • 研究了Ti在烧结和设备操作期间的独特化学反应活动和扩散行为.
  • 描述了接口接触电阻,并评估了产生的热电模块的性能和耐用性.

主要成果:

  • 在烧结过程中形成的高度反应的三元 MgTiSb 转移稳定相,在操作过程中转化为稳定的二元 Ti-Sb 合金.
  • 实现了低的界面接触电阻,低于5μΩ·cm2.
  • 在440K的温度差距下,基于Mg3Sb2的模块效率高达11%,超过了最先进的中温模块.
  • 在长期的热循环过程中,Ti薄膜/Mg3(Sb,Bi) 2关节呈现微不足道的降解.

结论:

  • 薄板作为一个有效和坚固的屏障层,Mg3Sb2基于热电材料,克服了以前的方法的局限性.
  • 开发的接口可以实现高模块效率和优良的长期稳定性,这对于实际的热电应用至关重要.
  • 这种方法为高效和可持续的废热回收系统铺平了道路.