In-situ synthesized graphene reinforced copper matrix composites with enhanced thermal properties and corrosion resistance

Graphene is expected to comprehensively improve the thermal conductivity and corrosion resistance of metals to satisfy the need of adverse electrochemical environments. However, there are some major concerns in the mixing methods such as, low quality of graphene, non-uniform dispersion, and poor interface bonding with the metal matrix. In this study, we propose an effective approach to fabricate Cu-graphene (Cu/G) nanocomposite by sintering in-situ growth of graphene on Cu nanoparticles. Results confirmed the firmly adhesive graphene on Cu surface, which closely linked Cu particles to building a bulk, particularly binding between Cu particles and graphene flakes is largely improved by the sintered progress. The as-prepared Cu/G heat spreader demonstrated higher thermal conductivity (376 W/(m·K) at room temperature and lower thermal expansion. Additionally, the short-time corrosion resistance showed that Cu/G can build a graphene network to avoid the penetration of active species and enhance the passivation layer. This work endows Cu/G integral materials possessing good thermal conductivity and corrosion inhibition, which can effectively serve as potential offshore materials.