Laser cladding Ni–Co duplex coating on copper substrate

Ni–Co duplex coating has been successfully cladded on copper substrate by continuous wave CO2 laser. The average microhardness of cladded coating was 635 HV0.05, which was about 7 times of Cu substrate (92 HV0.05). During sliding wear tests, the volume loss of copper substrate was about 7 times of Ni–Co duplex coating at 60 min. The high microhardness and crack free advantages of Ni–Co duplex coating, were favorable to reduce the plastic deformation and adhesive wear of copper substrate, resulting in the improvement of wear properties.