Preparation and characterization of coatings with anisotropic thermal conductivity
Preparation and characterization of coatings with anisotropic thermal conductivity
复制标题
各向异性导热涂层的制备及表征
DOI：
10.1016/j.matdes.2018.10.046
复制
发表时间：
2018-12-15
影响因子：
8.4
通讯作者：
Wang, Fuchi
中科院分区：
文献类型：
--
作者：
Ma, Chen;Ma, Zhuang;Wang, Fuchi
集中热源引起的温度升高会影响航天器内电子部件的性能。因此，开发先进的热控制系统对于将它们保持在安全的温度范围内至关重要。为此，本工作制备了由酚醛树脂（PF）和热解石墨片（PGS）组成的各向异性导热涂料。通过计算高能量连续波激光产生的热影响区面积来估算涂层水平方向沿着的热扩散率，而垂直方向的隔热能力则通过测量铝基板背面温度来确定。结果表明，PGS的引入显著提高了涂层的热扩散率，从而降低了涂层的背面温度。用功率密度为1500 W/cm（2）的激光辐照含三片PG的涂层10 s后，其背表面温度仅为29 ℃，远低于纯PF制备的涂层的背表面温度（190 ℃）。因此，所制备的涂层表现出优异的各向异性导热性能，并可以潜在地用作航天器电子设备的保护屏蔽。(c)2018爱思唯尔有限公司版权所有
The temperature increase caused by a concentrated heat source can affect the performance of electronic components inside spacecraft. Therefore, the development of an advanced thermal control system is essential for maintaining them in a safe temperature range. For this purpose, anisotropic thermal conductive coatings consisting of phenolic formaldehyde resin (PF) and pyrolytic graphite sheets (PGS) have been prepared in this work. The area of the heat-affected zone produced by a high-energy continuous wave laser is calculated to estimate the thermal diffusivity along the horizontal direction of the coating, whereas the thermal insulating capacity in the vertical direction is determined by measuring the back-surface temperature of the aluminum substrate. The obtained results show that the introduction of PGS noticeably improves the thermal diffusivity of coating, leading to a decrease in its back-surface temperature. After irradiating the coating containing three pieces of PGSwith laser at a power density of 1500 W/cm(2) for 10 s, its back-surface temperature is only 29 degrees C, which is much lower than that of the coating fabricated from pure PF (190 degrees C). Hence, the prepared coatings exhibit excellent anisotropic thermal conductive properties and can be potentially used as protective shields for spacecraft electronics. (c) 2018 Elsevier Ltd. All rights reserved.