Enhanced properties of carbon nanotube-graphite hybrid-reinforced Cu matrix composites via optimization of the preparation technology and interface structure

Unique reinforcement strategies are explored for the development of an advanced copper-carbon composite. In this work, carbon nanotube-graphite (CNTs-Gr) hybrid-reinforced Cu matrix composites were fabricated by electroless plating assisted with ultrasonic spray atomization (EPUSA), molecular-level mixing (MLM) and spark plasma sintering (SPS). Microstructures, electrical conductivity, mechanical and tribological properties of such composites were investigated. Results demonstrated that high-efficiency strengthening was achieved by employing the decorated CNTs-Gr hybrid as reinforcement in the Cu matrix. Meanwhile, electrical conductivity, and mechanical and tribological properties of composites were improved with CNTs-Gr hybrid addition and increased with greater CNTs concentrations. This work not only proved the importance of the reticulate multiscale structure of the CNTs-Gr hybrid and interface for improving properties of the Cu-graphite composites, but also provided new insights to improve properties of the Cu-graphite composites. (C) 2019 Elsevier B.V. All rights reserved.