Experimental Study On Thermal Conductivity Of GP/MWCNTs/EP Composites

In the field of microelectronics,electronic devices are gradually miniaturized to high-frequency,high-speed and integrated circuits.Requiring a larger amount of electronic equipment in the composite material with small size,high thermal conductivity characteristics.Polymer thermal conductive composite material can be a good solution to the device in different working conditions can still maintain the normal heat problem In this paper,epoxy resin as matrix,graphene powder and multi-walled carbon nanotubes were used as thermal conductive filler to prepare graphene / carbon nanotubes / epoxy resin composites.The thermal diffusivity in the in-plane direction of the composite under micro-scale was measured by transient electrothermal technique and transient plane heat source method.The thermal conductivity of composite materials with single addition and synergistic addition of thermally conductive filler was compared and analyzed.Epoxy resin and its composite materials because of its excellent bonding properties,corrosion resistance and electrical insulation properties are widely used in electronics,electrical,mechanical and other industrial fields.The graphene is a two-dimensional carbon material composed of a single atom layer hybridized by carbon atoms.The carbon nanotubes are tubular materials formed by crimping the carbon atoms in the graphite.Based on the synergistic effect of different structures of graphene and carbon nanotubes,the composites were prepared by ultrasonic dispersion method.In order to form a complete thermal conduction network under the lower thermal conductivity content,so as to improve the thermal conductivity of the composite material more effectively.Based on the principle of transient electrothermal technology,the test sample is placed in the vacuum chamber,ignoring the influence of convective heat transfer,measuring the thermal diffusivity in the in-plane direction of the composite under micro-scale,the effect of removing the radiation and the influence of the material on the gold-The true thermal diffusivity of the sample is obtained and the thermalconductivity of the sample is introduced.At the same time,the thermal conductivity of the sample perpendicular to the plane was measured by the transient plane heat source method.The results show that when the graphene and carbon nanotubes are used as thermal conductive fillers,the thermal conductivity of the composites in the plane and perpendicular to the surface is better than that of the thermal conductive filler(graphene or carbon nanotubes),and with the proportion of GP The greater the thermal conductivity of the composites.But the in-plane trend is greater than the trend in the vertical direction.