Effect of electrically aligned polycrystalline diamond flakes on the through-plane thermal conductivity of heat conduction sheets

Masafumi Inaba; Seiya Seike; Yingchen Chen; Soichiro Ichiki; Yoshihiko Kubota; Shinya Ohmagari; Michihiko Nakano; Junya Suehiro

doi:10.1080/26941112.2024.2423643

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Effect of electrically aligned polycrystalline diamond flakes on the through-plane thermal conductivity of heat conduction sheets

Research Article | Updated：2025-01-22

- Effect of electrically aligned polycrystalline diamond flakes on the through-plane thermal conductivity of heat conduction sheets
- Functional Diamond Vol. 4, Issue 1, (2024)
- Affiliations：
  
  1. a Faculty of Information Science and Electrical Engineering Kyushu University
  2. b Graduate School of Information Science and Electrical Engineering Kyushu University
  3. c Sensing System Research Center (SSRC) National Institute of Advanced Industrial Science and Technology (AIST)
- Author bio：
- Funds：
- DOI：10.1080/26941112.2024.2423643
  CLC：
- Online First：05 November 2024，
  
  Published：2024
- Accepted：
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Masafumi Inaba, Seiya Seike, Yingchen Chen, et al. Effect of electrically aligned polycrystalline diamond flakes on the through-plane thermal conductivity of heat conduction sheets[J]. Functional Diamond2024, 4(1).
DOI：

Masafumi Inaba, Seiya Seike, Yingchen Chen, et al. Effect of electrically aligned polycrystalline diamond flakes on the through-plane thermal conductivity of heat conduction sheets[J]. Functional Diamond2024, 4(1). DOI： 10.1080/26941112.2024.2423643.

摘要

Abstract

Heat conduction sheets

which are composed of a thermally conductive filler and a base elastomer matrix

are important for dissipating heat from devices to a heat sink. Alignment of the heat-conducting two-dimensional filler particles enhances the thermal conductivity of the heat conduction sheet. In this study

we prepared polycrystalline diamond (PCD) flakes and then electrically aligned the PCD flakes in the through-plane direction of heat conduction sheet samples. The PCD flakes were fabricated by pulverizing a synthesized PCD thin layer. The typical size of the PCD flakes was ∼1 μm in thickness and ∼35 μm in diameter. The PCD flakes were electrically aligned in a polydimethylsiloxane (PDMS) matrix by applying alternating high voltage with parallel-plate electrodes. The heat conduction sheet containing 20 wt% aligned PCD flakes in the matrix exhibited high through-plane thermal conductivity of 0.47 W m

−1

while that of the heat conduction sheet with aligned granular diamond filler particles was 0.37 W m

−1

. The high thermal conductivity comes from the formation of

a large contact area between the filler particles and flake network by electrical alignment in the heat conduction sheet.

关键词

Keywords

references

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