Preparation of high thermal conductivity porous graphite preforms and its performance
A porous graphite preform was prepared using natural flake graphite,phenolic resin,and mesocarbon microspheres as the main raw materials.After graphitization treatment,it was composite with epoxy resin to obtain high thermal conductivity graphite/epoxy resin composites.The effects of green bodies forming density and powder composition on the thermal conductivity in the X-Y direction and porosity of the porous graphite preforms were studied.The results show that the graphite flakes in the preforms are arranged in a directional manner,and the phenolic resin and mesocarbon microbeads are connected between them to form a directional porous network structure,which realizes the synergy of high thermal conductivity,high porosity and large pore size.When the forming density of the green body is 1.4 g/cm3,and the contents of natural flake graphite,phenolic resin,and mesocarbon microspheres are 67.5 mass%,17.5 mass%and 15 mass%,respectively,the thermal conductivity in the X-Y direction of the porous graphite preform reaches 286.97 W/(m·K),and the porosity reaches 44.56%.At this time,the thermal conductivity of the graphite/epoxy resin composites in the X-Y direction reaches 116.81 W/(m·K),and the compressive strength is 26 MPa,which has potential application prospects in the field of electronic packaging.
high thermal conductivitydirectional arrangement structurenatural flake graphitepreparation of porous materials
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