Designable interfacial structure and its influence on interface reaction and performance of MWCNTs reinforced aluminum matrix composites

In view of the research of carbon nanotubes (CNTs) reinforced aluminum matrix composites (AMCs), weak CNTs/Al interface bonding and adverse interface reaction are the key scientific problems which restrict the strengthening effect of CNTs in AMCs. This study proposed a new idea of introducing SiC transition layer between CNTs/Al interface based on the composite configuration and interface structure design of AMCs. The results showed that CNTs-SiC composite powders with controllable structure were successfully synthesized by carefully controlling the ratio between Si and CNTs. The adverse interface reaction was regulated and the interface coalescence between CNTs and Al matrix was enhanced effectively. It was also found that the thicker SiC layer consumed more energy in peeling and fracture during loading due to the carbide-linked inner walls provided stronger interlocked bonding, corresponding stronger ability to transfer the load from matrix to reinforcements and strengthen the load bearing capacity of CNTs in AMCs. Therefore, the mechanical performance of CNTs reinforced AMCs were significantly improved by further achieving the compounding effect of CNTs, which provide an effectual method and basis for the development and application of CNTs reinforced AMCs.