期刊文献+

高密度石墨泡沫及其石蜡复合材料的热物理性能(英文) 被引量:7

Thermophysical properties of high-density graphite foams andtheir paraffin composites
下载PDF
导出
摘要 以中间相沥青和添加中间相炭微球的沥青为原料,调整发泡压力和发泡温度制备沥青泡沫,经1273K炭化和2973K石墨化,制备了高密度石墨泡沫。为了进一步提高石墨泡沫的密度,采用573 K的沥青反复浸渍炭化未添加中间相炭微球的沥青在1273K下所制的泡沫炭,再经2973K石墨化获得增密度后的石墨泡沫。而后制备了相应石墨泡沫/石蜡复合材料。研究了石墨泡沫热物理性能的影响因素和石墨泡沫/石蜡复合材料的热行为。研究表明:沥青组分、发泡温度和发泡压力决定了石墨泡沫的结构和热物理性能,而石墨泡沫的热导率决定了复合材料的热行为。与石蜡相比,石墨泡沫/石蜡复合材料的热扩散系数提高了768至1588倍。石墨泡沫/石蜡复合材料的潜热与石蜡的质量分数成正比。该复合材料是快速响应电子散热材料的良好选择。 High-density graphite foams (GFs) were prepared from mesophase pitch with or without mesocarbon microbeads at different foaming temperatures and pressures, followed by carbonization and graphitization at 1273 and 2 973 K, respectively. In one case, pitch was repeatedly infiltrated into the graphitized foam at 573 K followed by carbonization to increase its density. Paraffin was infiltrated into the GFs to form GF/paraffin composites. Factors determining the thermophysical properties of the GFs and thermal behavior of the GF/paraffin composites were investigated. The microstructure and thermophysical properties of the foams were found to be greatly influenced by the pitch fraction, foaming temperature and foaming pressure. The thermal conductivity of the foams determines the thermal behavior of the GF/paraffin composites. The thermal dlffusivity of the GF/paraffin composites investigated can be increased 768 to 1588-fold compared with that of paraffin. The latent heat of the composites has an almost linear relationship with the mass fraction of paraffin in the composites. The composites are suitable candidates for passive cooling of electronics.
出处 《新型炭材料》 SCIE EI CAS CSCD 北大核心 2012年第1期27-34,共8页 New Carbon Materials
基金 supported by the National Basic Research Program of China(2011CB605802)~~
关键词 高密度石墨泡沫 石蜡 散热能力提高 High density graphite foams Paraffin Heat transfer enhancement
  • 相关文献

参考文献27

  • 1Anandan S S,Ramalingam V.Thermal management of electron-ics:A review of literature[J].Therm Sci,2008,12(2):5-26.
  • 2Garimella S V.Advances in mesoscale thermal management technologies for microelectronics[J].Microelectron J,2006,37(11):1165-1185.
  • 3Lafdi,K,Mesalhy O,Elyafy A.Graphite foams infiltrated with phase change materials as alternative materials for space and ter-restrial thermal energy storage applications[J].Carbon,2008,46(1):159-168.
  • 4Shatikian V,Ziskind G,Letan R.Numerical investigation of a PCM-based heat sink with internal fins[J].Int J Heat Mass Transfer,2005,48(17):3689-3706.
  • 5Sharma A,Tyagi V V,Chen C R,et al.Review on thermal en-ergy storage with phase change materials and applications[J].Renew Sust Energ Rev,2009,13(2):318-345.
  • 6Zhong Y J,Guo Q G,Li S Z,et al.Heat transfer enhancement of paraffin wax using graphite foam for thermal energy storage[J].Solar Energy Mater Sol Cells,2010,94(6):1011-1014.
  • 7Wang X Q,Yap C,Mujumdar A S.A parametric study of phase change material(PCM)-based heat sinks[J].Int J Therm Sci,2008,47(8):1055-1068.
  • 8Zhao C Y,Lu W,Tian Y.Heat transfer enhancement for ther-mal energy storage using metal foams embedded within phase change materials(PCMs)[J].Sol Energy,2010,84(8):1402-1412.
  • 9Hong S T,Herling D R.Open-cell aluminum foams filled with phase change materials as compact heat sinks[J].Scripta mater,2006,55(10):887-890.
  • 10Hong S T,Herling D R.Effects of surface area density of alu-minum foams on thermal conductivity of aluminum foam-phase change material composites[J].Adv Eng Mater,2007,9(7):554-557.

二级参考文献4

共引文献21

同被引文献87

引证文献7

二级引证文献42

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部