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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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If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
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Highly oriented BN-based TIMs with high through-plane thermal conductivity and low compression modulus.

Rongjie Yang1,2, Yandong Wang1, Zhenbang Zhang1

  • 1Key Laboratory of Advanced Marine Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, China. xuechen@nimte.ac.cn.

Materials Horizons
|July 23, 2024
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Summary
This summary is machine-generated.

Researchers developed advanced boron nitride (BN) thermal interface materials (TIMs) with enhanced thermal conductivity and low compression modulus for effective electronic device cooling. These new BN-TIMs outperform commercial options, improving heat dissipation.

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Area of Science:

  • Materials Science and Engineering
  • Thermal Management
  • Nanomaterials

Background:

  • Effective thermal management is critical for electronic devices, requiring insulation thermal interface materials (TIMs) with high thermal conductivity and low compression modulus.
  • Boron nitride (BN) is a promising material, but existing BN composites have limitations in thermal conductivity, compression modulus, and mass production.
  • Previous BN-based composites showed thermal conductivity below 10 W m⁻¹ K⁻¹ and high compression modulus, hindering widespread application.

Purpose of the Study:

  • To develop a novel boron nitride (BN)-based thermal interface material (TIM) with superior through-plane thermal conductivity, low thermal resistance, and minimal compression modulus.
  • To overcome limitations of existing BN composites regarding thermal performance, mechanical properties, and mass production challenges.
  • To demonstrate the enhanced heat dissipation capabilities of the developed BN-TIM compared to commercial alternatives.

Main Methods:

  • Utilized low molecular weight polydimethylsiloxane (PDMS) and large-size BN as foundational materials.
  • Employed a rolling-curing integrated apparatus for continuous preparation of large-sized, high-adhesion BN films.
  • Implemented stacking, cold pressing, and vertical cutting techniques to fabricate the final BN-based TIM.

Main Results:

  • Achieved a novel BN-based TIM with a through-plane thermal conductivity up to 12.11 W m⁻¹ K⁻¹.
  • The developed TIM exhibits a remarkably low compression modulus of 55 kPa and effective thermal resistance of 0.16 °C in² W⁻¹.
  • Demonstrated superior heat dissipation: a 7 °C lower steady-state temperature compared to commercial TIMs at 40 W cm⁻² heating power density.

Conclusions:

  • The developed BN-based TIM offers unprecedented thermal conductivity and low compression modulus, addressing key challenges in thermal management.
  • The continuous preparation method facilitates mass production, paving the way for wider industrial adoption.
  • This advancement provides valuable insights for high-performance insulating TIM development and broad application in electronic thermal management.