Zongyun Shao , Liqin Fu , Zhiqian Wang , Min Huang , Kun Jia , Nizao Kong , Ruibang Xie , Chiyu Wen , Kaiwen Hou , Fei Han
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引用次数: 0
摘要
电子热界面材料(TIMs)具有高导热性和优异的回弹性,但在TIMs中同时实现这些性能仍然具有挑战性。本文采用简单的铺层方法,将长中间相沥青基碳纤维垂直排列,制备了具有高导热性和高力学性能的TIMs。垂直排列的长碳纤维不仅可以最小化导热通道和最大化通道数量,还可以为软硅橡胶(SR)基体提供结构支撑,从而使TIMs获得优异的导热性能和力学性能。结果表明,CFs含量为70 wt%的复合材料的平面导热系数高达28.4 W m−1 K−1。此外,该复合材料还具有令人印象深刻的机械性能,包括低邵氏硬度61,高压缩率63.8%,在45 psi压力下具有82%的优异回弹率。具有如此高的填充率,令人惊叹的结果突出了碳纤维阵列填充复合材料在先进热管理应用中的潜力,这为进一步制造高性能弹性TIMs提供了参考方案。
Resilient thermal interface materials with high through-plane thermal conductivity based on consistent construction of carbon fibers arrays
Thermal management issues in electronics force thermal interface materials (TIMs) possessing both high thermal conductivity and excellent resilience, but simultaneously achieving these properties in TIMs remains challenging. In this paper, TIMs with both high thermal conductivity and mechanical properties are prepared by vertically aligning long mesophase pitch-based carbon fibers (CFs) in a simple lay-up method. The vertically aligned long CFs can not only minimize the thermal conductivity channels and maximize the number of the channels, but also provide structural support for the soft silicone rubber (SR) matrix, thus enabling TIMs to obtain both excellent thermal conductivity and mechanical properties. As a result, the prepared composite with a CFs content of 70 wt% possesses through-plane thermal conductivity up to 28.4 W m−1 K−1. In addition, the composite exhibits impressive mechanical properties, including a low Shore 00 hardness of 61, a high compressibility of 63.8 %, and superior rebound rate of 82 % under 45 psi pressure. With this high filler ratio, the stunning results highlight the potential of the carbon fiber arrays-filled composite for the advanced thermal management applications, which provides a reference scheme for further fabrication of high-performance resilient TIMs.
期刊介绍:
Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.