Current-carrying tribological properties of Ni-coated graphite-copper matrix composites under different loads
Firstly,the chemical plating method was used to deposit Ni on the surface of graphite,followed by the rapid hot pressing method to prepare a 10 mass％Ni-coated graphite-copper matrix composites.Current-carrying friction experiments were conducted on the composites under different loads,the wear surface morphology of the composites was observed using scanning electron microscopy,and its damage mechanism was then analyzed based on the wear surface morphology characteristics.The results show that a dense and uniform Ni metal layer is successfully coated on the surface of graphite,and chemical nickel plating effectively improves the wettability between graphite and copper.The Ni-coated graphite-copper matrix composites consists of two phases:graphite and copper matrix,and the graphite is dispersed in the copper matrix and does not form a continuous network structure.With the increase of the load,the friction coefficient of the composites gradually decreases,the width of wear marks and wear rate gradually increase,and the current-carrying efficiency and stability gradually decrease.At low loads(20 and 40 N),the damage mechanism of the composites is mainly micro cutting.As the load increases(60 and 80 N),electrical erosion intensifies and becomes the main damage mechanism.
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