High-temperature wear behaviour of plasma cladded WC/Ni60A composite coating on copper
Jun Zhang, Rong Hu, Ruidong Wang, Dan Bai, Chao Zhang, Yuwen Zhang, Wenhe Wu, Guangshi Li, Yuzhu Yang, Quanli Liu, Xionggang Lu
Abstract
With the aim of improving the surface properties of copper, WC/Ni60A composite coatings were successfully prepared by plasma cladding. A good metallurgical bonding was formed between composite coating and copper substrate. The large amount of dispersed WC and W 2 C phases in the coating significantly increased the microhardness (17 times that of the copper substrate). With the rise in temperature, the wear resistance of the coating first increased and then decreased. At 400°C, the coating had the best wear resistance due to the lubricating effect of the oxide layer. However, due to the simultaneous occurrence of various wear mechanisms, the wear resistance at 600°C was significantly reduced, so the service temperature must be controlled below 600°C.