Improving comprehensive performance of copper matrix composite by spray pyrolysis fabricated CNT/W reinforcement

As a hybrid reinforcement, interconnected architecture of carbon nanotubes (CNT)/Tungsten (W) composite powder was designed and fabricated by spraying pyrolysis (SP) method. Subsequently, CNT-W/copper (Cu) composites were fabricated successfully by low energy ball milling (LEBM) and spark plasma sintering (SPS). The electronic conductivity, mechanical properties, micro-morphology and interface microstructure of CNT-W/Cu composites were evaluated and characterized. The results revealed that CNT with attached W were dispersed uniformly in the Cu matrix and W particles played a “pinning” role of the CNT. The 0.6 wt%CNT-W sample exhibited ultimate tensile strength 226 MPa and the elongation 33%, which were 14% and 83% higher than that of pure Cu, respectively. Besides, the 0.8 wt% CNT-W sample exhibited electrical conductivity 92.3%IACS, which is very close to that of Cu matrix (92.6%IACS). Finally, the strengthening and electric conductivity mechanisms of CNT-W in Cu matrix were considered. This study inspires a new way of synergistically reinforced metal matrix composites. •(CNT)/Tungsten (W) composite powder was designed and fabricated.•CNT-W/copper (Cu) composites were fabricated by LEBM and SPS.•CNT with attached W were dispersed uniformly in the Cu matrix.•Mechanical properties were enhanced and the electric conductivity maintained.•The strengthening and electric conductivity mechanisms were discussed.