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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2022, Vol. 43 ›› Issue (4): 525604.doi: 10.7527/S1000-6893.2021.25604

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Properties of nickel-based composite alloy coating on copper reinforced by laser cladding

YONG Yaowei, ZHAO Ruiheng, WANG Jun, ZHANG Shuai   

  1. School of Mechanical Engineering, Ningxia University, Yinchuan 750021, China
  • Received:2021-03-31 Revised:2021-04-23 Published:2021-06-29
  • Supported by:
    National Natural Science Foundation of Ningxia(2018AAC03059); Ningxia Key Research and Development Program (Special Talents) (2020BEB04030); Scientific Research Project of Ningxia Education Department (NGY2018021)

Abstract: The copper alloy is widely used in the aerospace field because of its excellent characteristics. To improve the mechanical properties of copper alloys, an enhanced composite coating was successfully fabricated onto a copper substrate by laser cladding through adding mixture of ZrO2 and WC into Ni60 powder. The microstructure, interfacial composition, phase composition, hardness and wear resistance of the cladding layer were characterized and tested by means of Scanning Electron Microscope (SEM), X-ray Diffraction (XRD), and Energy Disperse Spectroscopy (EDS). The results show that the hardness of the coating was improved significantly by the strengthening phase of the carbides such as WC, ZrC, M23C6 and (W,Zr) C in the composite alloy coating. The hardness and wear resistance at room and high temperature of the alloy coating were estimated. It is found that both the hardness and wear resistance of the reinforced copper substrate was significantly improved. The hardness of the copper alloy was improved from 90 HV0.2 to 620 HV0.2 after reinforcing; meanwhile, the friction coefficient was decreased, and its wear resistance was improved. Especially, the resistance at high temperature was improved significantly by about 20 times. Therefore, the Ni-based alloy coating reinforced can effectively improve the mechanical properties of the copper substation, and can play a practical role in extending the service life of products such as crystallizer and chamber liner in the rocket engine.

Key words: laser cladding, copper alloy, composite coating, zirconium oxide, wear resistance

CLC Number: