Investigation of suitable graphene reinforcements for copper based PIM feedstock

Abstract

Abstract Graphene holds a remarkable potential as a reinforcement material for copper matrix due to its outstanding mechanical and electrical properties. However, noticeable increment in performance of graphene reinforced metal matrix composites is restricted due to inhomogeneous distribution and weak interfacial interaction between graphene reinforcement and metal matrix. Poor dispersion of graphene nanoplatelets can be attributed to absence of functional groups on graphene sheets, graphene oxide in contrast holds a large number of functional groups on its surface and edges, which make it dispersible in a wide range of matrices. In this research work, we investigate potential of graphene nanoplatelets and graphene oxide as reinforcement for copper based feedstock. During this study, two different approaches, solvent based mixing and copper grafting, have been employed as dispersion methods. A radical approach for incorporation of graphene in metal matrix is also devised, by taking benefit from functional nature of graphene oxide and anchoring copper particles on graphene oxide sheets. Successful growth of copper particles along with simultaneous reduction of graphene oxide have been observed by using scanning electron microscopy and infrared spectroscopy analysis. Copper particles as intercalation species present a viable potential to resist re-agglomeration of graphene sheets while enhancing the interfacial interaction between copper matrix and graphene at the same time. Copper graphene nanocomposite can potentially be used as a reinforcement for copper based powder injection molding feedstock.