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以AR沥青为原料,利用高压釜在不同恒温条件下制备了炭泡沫,并测定了其孔结构、体积密度、显气孔率、压缩强度、常温热导率以及微晶参数.结果表明:相对于短恒温时间,长恒温时间制得的炭泡沫孔径大(412nm)、显气孔率高(83.82%)、体积密度小(0.34g/cm~3)、压缩强度高(4.92MPa),多孔连通结构更丰富.经过石墨化处理后,石墨泡沫呈现出较高的常温热导率(71.34W/(m·K))和较小的层片间距d_(002)(0.33556nm).石墨泡沫的常温比导热率能达到210(W·(m·K)~(-1)) /(g·cm~(-3)),是铜的5倍,铝的4倍.

Carbon foams were prepared from AR pitch in a high pressure/high temperature reactor under different heating conditions. Their pore structure, bulk density, porosity, compressive strength, thermal conductivity, and crystallite size parameters were measured. Foams produced using a long time at a constant foaming temperature exhibit bigger pore size (412 nm), higher porosity (83.82%), lower bulk density (0.34 g/cm~3), higher compressive strength (4.92 MPa), and more interconnected pores than that produced in a short time at the same constant foaming temperature, which exhibit high thermal conductivity (71.34 W/(m · K)) and low interlayer d-spacing (d_(002)) (0.335 56 nm) after graphitization at 2 800 ℃. The specific thermal conductivity of graphite foams can reach 210 (W · (m · K)~(-1))/( g · cm~(-3)), which is about five times greater than copper and four times greater than aluminum.

参考文献

[1] Klett J W.High thermal conductivity mesophase pitch-derived carbon foam[A].,1998:745-755.
[2] Klett J W .Process for Making Carbon Foam[P].US Patent:6,033,506,2000.
[3] 王小宪,李铁虎,魏宏艳,林起浪,冀勇斌.泡沫炭的制备和性能[J].材料导报,2005(05):11-13.
[4] 闫曦,史景利,宋燕,郭全贵,刘朗.中间相沥青基泡沫炭的制备及性能[J].宇航材料工艺,2006(02):56-59,67.
[5] 闵振华,曹敏,张书,王秀丹,王永刚.前驱体对炭泡沫孔结构的影响[J].新型炭材料,2007(01):75-79.
[6] Klett J;Conway B.Thermal management solutions utilizing high thermal conductivity graphite foams[A].,2000:1933-1943.
[7] Klett J;James W.Effect of processing conditions on properties of graphite foam[A].北京,2002
[8] WANG Y G;ZHOU J M;CAO M.Influence of preparating conditions on carbon foam structure[A].,2004
[9] Klett JW;McMillan AD;Gallego NC;Walls CA .The role of structure on the thermal properties of graphitic foams[J].Journal of Materials Science,2004(11):3659-3676.
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