石墨烯/碳纳米管/环氧树脂复合材料的导热性能的实验研究

Experimental study on thermal conductivity of GP / MWCNTs / EP

中文关键词: 石墨烯/碳纳米管/环氧树脂复合材料 热扩散率 导热系数 瞬态电热技术

英文关键词: graphene / carbon nanotube / epoxy composite, thermal diffusivity, thermal conductivity, transient electro-thermal technology

中文摘要:

      在微电子领域中，随着元器件的体积微小化，要求导热材料具备体积小、高导热的特点。高分子导热复合材料能很好的解决器件在不同的工作环境中仍能保持正常的散热问题。本文以环氧树脂（EP）为基体，石墨烯粉末（GP）和多壁碳纳米管（MWCNTs）为导热填料,采用溶剂和超声分散法，制备出石墨烯/碳纳米管/环氧树脂复合材料。实验采用瞬态电热技术测量其导热系数，结果显示，石墨烯与碳纳米管协同作为导热填料时，复合材料导热性优于单独添加导热填料（GP或MWCNTs），且随着GP所占比例的增大复合材料的导热系数越大。当GP和MWCNTs比例分别为0.7%和0.3%时，复合材料导热系数为0.94，相比于纯EP导热系数提高了286.83% 。

英文摘要:

      In the field of microelectronics, as the volume of components becomes small, heat conducting materials require small size and high thermal conductivity. The polymer thermal conductive composite material can solve the problem that the device can still keep the normal heat dissipation in different working environment.In this paper ,graphene / carbon nanotubes / epoxy composites were prepared by solvent and ultrasonic dispersion method using epoxy resin (EP) as the matrix, graphene powder (GP) and multi-walled carbon nanotubes (MWCNTs) as thermal conductive fillers.The thermal conductivity was measured by transient electrothermal technique,the results show that when the graphene is synergistic with carbon nanotubes as the thermally conductive filler, the thermal conductivity of the composites is better than the addition of only one thermal filler (GP or MWCNTs),and the thermal conductivity of the composites increases with the increase of the proportion of GP.When the ratio of GP and MWCNTs is 0.7% and 0.3%, the thermal conductivity of the compound material is 0.94, which is 286.83% higher than that of pure EP.