Synergistic effect of woven copper wires with graphene foams for high thermal conductivity of carbon fiber/epoxy composites

Abstract

Enhancing thermal conductivity of carbon ber laminated composites (CFRP) in out-of-plane directions without sacri cing mechanical properties is still challenging for fabrication of high-performance composites with structural and functional integration. In this work, a novel hybrid sandwich composite was fabricated by weaving copper wires through carbon ber (CF) fabrics, laminating graphene foams (GrFs) onto surfaces, and in ltrating with epoxy via vacuum-assisted resin transfer molding technique. High-e ciency heat transfer pathways were constructed to greatly increase out-of-plane thermal conductivity of composites with maintaining CF continuity. Microstructure, electrical property, and thermal conduction of composites were experimentally measured and theoretically simulated. The hybrid sandwich composites exhibited much higher electrical and thermal conductivity than the CFRP, and their out-of-plane thermal conductivity was up to 1.097 W/m•K, increasing by 104% in comparison with that of CFRP. Such remarkable thermal enhancement is mainly attributed to high intrinsic conductivity of the copper wire and GrF, continuous heat transfer pathways, and synergistic effect of copper wire with GrF for rapid heat transfer and diffusion. The hybrid sandwich composites show great potential to be used as high-performance materials with structural and functional integration in the elds of aerospace and transportation.