Effect of Cu and Its Coated Diamond Particles on the Microstructure and Properties of Ni-based Composite Coatings

Ni-based composite coatings with directly added Cu and Cu-coated diamond were prepared by induction heating technology. The effects of Cu addition on the microstructure, phase evolution, microhardness and wear properties of Ni-based composite coatings were investigated. The results show that the direct addition of Cu and the introduction of Cu in the form of Cu-coated diamond in the diamond-nickel-based composite coatings inhibit the generation of carbides in the nickel alloy matrix, and in the form of Cu-coated diamond, almost no carbides are observed in the nickel alloy matrix. The average microhardness of the coating with Cu-coated diamond is decreased by 76.7 HV compared to that of the direct addition of Cu; moreover, the coating shows more excellent wear resistance in the 15‒45 min wear stage of the abrasive wear test.