Effect of tungsten-coated diamond content on interfacial microstructure and wear resistance of nickel-based induction composite coatings

To study the interfacial microstructure and wear resistance of the tungsten-coated diamond reinforced nickel-based composite coating, tungsten-coated diamond particles and nickel-based brazing filler were used as coating materials, and a tungsten-coated diamond/nickel-based composite coating was prepared on the surface of H13 steel by an induction brazing process. The coatings were analyzed using a scanning electron microscope, an energy dispersive spectrometer, an abrasive wear testing machine, and a super-depth microscope. The results show that the content of tungsten-coated diamond has little effect on the interfacial bonding between the coating and the steel substrate, and no cracks or holes appear at the interface. The tungsten coating on the surface of the tungsten-coated diamond undergoes dissolution and diffusion, and a large amount of C-Cr and Ni-W compounds are distributed on the surface of the tungsten-coated diamond after brazing. The wear resistance of the coating shows a trend of first increasing and then decreasing with the increase of the content of tungsten-coated diamond. When the mass fraction of tungsten-coated diamond is 10%, the coating has the best wear resistance, with a wear loss of 250 mg.