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首页> 外文期刊>Carbon: An International Journal Sponsored by the American Carbon Society >High-thermal-conductivity, mesophase-pitch-derived carbon foams: effect of precursor on structure and properties
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High-thermal-conductivity, mesophase-pitch-derived carbon foams: effect of precursor on structure and properties

机译:高导热,中间相沥青衍生的碳泡沫:前体对结构和性能的影响

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摘要

Pitch-based carbon foams are not new, but the development of high thermal conductivity foams for thermal management applications has yet to be explored. The research reported here focused on a novel foaming technique and the evaluation of the foaming characteristics of two mesophase pitches (Mitsubishi ARA24 and Conoco Dry Mesophase). After graphitization to 2800 degrees C, densities of the graphite foams ranged from 0.2 to 0.6 g/cm(3), with average pore diameters ranging from 275 to 350 mu m for the ARA24-derived foams, and from 60 to 90 mu m for the Conoco-derived foams. Scanning electron microscopy and polarized light optical microscopy were performed to characterize the cell walls, revealing highly aligned graphitic-like structures along the axis of the ligaments. Analysis of X-ray diffraction results determined that the foams exhibited average interlayer (d(002)) spacings as low as 0.3355 nm, stack heights (L-c) up to 80 nm and crystallite sizes (L-c) UP to 20 nm. Finally, thermal diffusivity measurements were pet-formed revealing that the bulk thermal conductivity varied with density from 40 to 150 W/m K. The specific thermal conductivities of the graphitized foams were more than six times greater than solid copper. (C) 2000 Elsevier Science Ltd. All rights reserved. [References: 39]
机译:沥青基碳泡沫并不是什么新鲜事物,但是尚未开发出用于热管理应用的高导热性泡沫。本文报道的研究集中在一种新颖的发泡技术上,并对两种中间相沥青(三菱ARA24和Conoco干中间相)的发泡特性进行了评估。石墨化至2800摄氏度后,石墨泡沫的密度为0.2至0.6 g / cm(3),ARA24衍生泡沫的平均孔径为275至350μm,而ARA24泡沫的平均孔径为60至90μm。康菲泡沫。进行了扫描电子显微镜和偏光光学显微镜以表征细胞壁,揭示了沿韧带轴高度对齐的石墨状结构。 X射线衍射结果分析确定,泡沫材料的平均中间层间距(d(002))低至0.3355 nm,堆积高度(L-c)高达80 nm,微晶尺寸(L-c)高达20 nm。最后,热扩散率测量结果呈pet形式,表明整体热导率随密度在40到150 W / m K之间变化。石墨化泡沫的比热导率比固态铜大六倍以上。 (C)2000 Elsevier ScienceLtd。保留所有权利。 [参考:39]

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