Wear and heat shock resistance of Ni-WC coating on mould copper plate fabricated by laser

A Ni-WC coating was fabricated successively on a copper substrate by laser. The microstructure, hardness and wear resistance were investigated. The thickness of Ni-WC coating was 0.65 mm and average hardness of strengthening layer was 667HV(0.1), which was approximately 7.8 times higher than the hardness of copper substrate. The wear volume of Ni-WC coating was only 0.014 mm(3), which was only 1.02% wear volume of copper substrate. The decrease in wear volume was mainly due to presence of reinforced phases, such as gamma-Ni, Cr0.19Fe0.7Ni0.11, M7C3, M23C6 and WC. In addition, there was no coating peeled off after 100 times trials of heat shock resistance experiment at 800 degrees C. The experimental results show that this Ni-WC coating has a good metallurgical bonding strength and hardness, and it also has good wear resistance and high temperature property, which is helpful to improve the service life of mould copper plate. (C) 2020 The Authors. Published by Elsevier B.V.