Synergetic Effect of Graphene and MWCNTs on Microstructure and Mechanical Properties of Cu/Ti₃SiC₂/C Nanocomposites

Multi-walled carbon nanotubes (MWCNTs) and graphenes have been taken for novel reinforcements due to their unique structure and performance. However, MWCNTs or graphenes reinforced copper matrix composites could not catch up with ideal value due to reinforcement dispersion in metal matrix, wettability to metal matrix, and composite material interface. Taking advantage of the superior properties of one-dimensional MWCNTs and two-dimensional graphenes, complementary performance and structure are constructed to create a high contact area between MWCNTs and graphenes to the Cu matrix. Mechanical alloying, hot pressing, and hot isostatic pressing techniques are used to fabricate Cu matrix self-lubricating nanocomposites. Effects of MWCNTs and graphenes on mechanical properties and microstructures of Cu/Ti₃SiC₂/C nanocomposites are studied. The fracture and strengthening mechanisms of Cu/Ti₃SiC₂/C nanocomposites are explored on the basis of structure and composition of Cu/Ti₃SiC₂/C nanocomposites with formation and function of interface.