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Improving thermal conductivity is critical for tribological performance but remains a challenge. Here, a 3D structure with layered features is fabricated by electrostatic assembly of h - BN and GO nanosheets. The strategy for structural adjustment from macro to microscopic is beneficial for efficient phonon transport by reducing interfacial thermal resistance, which in turn promotes friction-reduction and wear resistance performance based on "synergistic lubrication". The superiority of the strategy is directly reflected in the excellent self-lubricating, wear-resistance properties, and outstanding thermal conductivity enhancement (1039.16 %) of the composite. Significantly, the comprehensive properties of epoxy-based composites are closely related to macro- and microgeometry of GO and h -BN, helping to reveal the relation between the structural design of multicomponent 2D fillers and tribology-based multifunctionality. [Display omitted] [ABSTRACT FROM AUTHOR]

With the development of energy-saving industries, the tribology and thermal management of composites were increasingly urgent. Here, we explored the dual-network graphene/epoxy composites with enhanced tribological and thermal management. The 3D graphene was prepared using calcium ions as the crosslinker and melamine foam as template. Subsequently, the reinforced concrete-like composites were obtained by dipping in silica-filled epoxy. The research results show that the thermal conductivity of the composites was enhanced by 1015.52% compared to the silica-filled epoxy. Simultaneously, the friction coefficient of the composites was reduced to 0.29 with the wear rate be reduced to 0.19 × 10−5 mm3/N∙m under the condition of 5 N and 2 cm/s. This dual-network model provides a new strategy for the development of solid lubricating materials with excellent thermal management. • The 3D graphene was prepared by template method, using Ca2+ as the crosslinking agent. • The dual-network graphene/epoxy composites were obtained by dipping method. • The thermal conductivity was up to 1.54 W/m∙k with the estimated GMF mass fraction 3.10 wt% • The friction coefficient was reduced to 0.31, with the wear rate was reduced by 97.25%. • Confirmed the key role of thermal conductivity in improving the tribological properties of materials. [ABSTRACT FROM AUTHOR]