• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2023, Vol. 59 ›› Issue (14): 83-91.doi: 10.3901/JME.2023.14.083

Previous Articles     Next Articles

Microstructure and Wear Resistance of Cu coated-CNTs/Cu Composite Coating Prepared with Supersonic Laser Deposition

LI Bo1,2, YAN Yuliang1,2, LIU Bo3, SUN Jingyong1,2, ZHANG Qunli1,2, VOLODYMYR Kovalenko1,2, YAO Jianhua1,2   

  1. 1. College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023;
    2. Collaborative Innovation Center of High-end Laser Manufacturing Equipment, Hangzhou 310023;
    3. State Grid Ningxia Maintenance Company, Yinchuan 750001
  • Received:2022-01-31 Revised:2022-12-05 Online:2023-07-20 Published:2023-08-16

Abstract: Supersonic laser deposition (SLD) is used to prepare CNTs/Cu composite coating on Cu substrate to improve its wear resistance. The surface of CNTs is copper-plated by electroless plating, and a uniformly distributed nano-Cu coating is obtained on the surface of CNTs. The cross-sectional morphology, microstructure, wear performance and mechanism of the as-prepared composite coating were analyzed, and the results showed that due to the simultaneous introduction of laser radiation into cold spray (CS) process to heat and soften Cu powder, CNTs/Cu composite coating prepared by SLD has high deposition efficiency and compactness. Thanks to the buffering effect of the copper coating on the surface, CNTs maintain their structural integrity during deposition process, and are evenly distributed in the composite coating, which are well bonded with Cu powder. The addition of copper-plated CNTs makes the composite coating have a lower coefficient of friction, wear scar width and depth, and show better wear resistance. The wear mechanism of the pure copper coating is adhesive wear, while the CNTs/Cu composite coating shows a coexistence mechanism of adhesive wear and abrasive wear.

Key words: supersonic laser deposition, surface copper electroless plating, CNTs/Cu composite coating, microstructure, wear-resistance

CLC Number: