Surface modification of C61900 copper alloy using a composite technology via coating and doping

Composite surface modification for C61900 copper alloy via titanizing and carburizing was investigated. Firstly, Ti film was deposited on the copper alloy substrate by closed field unbalanced magnetron sputtering, subsequently the plasma carburization was carried out on the Ti coated copper alloy. Then, the surface and cross-sectional morphologies and elements distribution in the composite modified layer were characterized by SEM, EDS and XRD. Additionally, the microhardness and wear resistance of the modified layer were also measured. The experimental results show that the best carburizing parameters are the plasma carburizing at 650℃ for 6 h, and the surface hardness of the modified C61900 copper alloy can be enhanced to over 300 HV0.01 as 3.8 times of that of the untreated one. Meanwhile, the wear rate decreased about 90% comparing with the untreated one. The problems of lower hardness and poor wear resistance of the C61900 copper alloy surface are solved.