Modification of Multi-Functional Composites by Using Particles with High Thermal Conductivity to Improve Heat Management and Electromagnetic Shielding Performance

Packaging materials with thermal management and electromagnetic protection are designed to develop miniaturized high-power airborne electronic equipment and meet the overall design requirements. In this study, graphene/paraffin composite material modified by high thermal conductivity particles is used to improve thermal conductivity, thermal management efficiency, and electromagnetic performance. Four kinds of high thermal conductivity particles including nickel, silver, copper, and hexagonal boron nitride were selected. Modified phase change material composite with carbon matrix was prepared by melt blending and pressure molding. Microstructure, thermal conductivity, latent heat, and electromagnetic properties were tested. Particles with different high thermal conductivity values could be uniformly distributed in the composite material by melt blending. Adding particles can improve the thermal conductivity of the composite to varying degrees, and copper and silver can also improve the electromagnetic shielding effectiveness of the composite. The composite material added with silver particles has the best modification effect, with a 92.3% increase in thermal conductivity and a 32.8% increase in shielding efficiency.