Research On The Thermal Conductivity Of Carbon Fiber/Polymer Composite Materials

With the reduction of the cost of preparation of carbon fiber, carbon fiber as athermal conductive filler shows broad application prospects. In this work, PE based,silicone/PE based, EP/PE based, those three kinds of carbon fiber composite materialswith different structures was prepared from the point of view of industrial productionand research needs. Structural Characterization and Thermal Characterization of thosecomposite materials shows the impact of structural changes on the thermal properties ofmaterials which have carbon fiber as thermal conductive filler. The main contents andconclusions are as follows:A uniform distribution of filler in PE/CF composite material obtained by thepowder mixing and hot-pressing method. In the case of carbon fiber concentration isless than30wt%, the thermal diffusion coefficient of the composite material increasessignificantly with the increase of the concentration of the filler carbon fiber, but there isno occurrence of percolation phenomenon. To meet the requirements of practicalapplications， the added amount of the carbon fibers is higher than expected, thecomposites can not be large-scale production.Three-phase double percolation structure of the carbon fiber composite materialcan be obtained by the use of lower temperature curing silicone rubber and an epoxyresin as a matrix, to which a higher softening point of the powder PE. The lower theconcentration of carbon fiber, double percolation structure can improve the utilization ofcarbon fiber reinforced composite thermal conductivity.When the content of carbon fiber Carbon fiber content is higher than6vol%,the double percolation structure reduces the degree of orientation of the carbonfibers, block the thermal chain, so the plane thermal conductivity of the materialis decreased with adding PE vertically while the thermal conductivity increaseswith adding PE not significant.