Microstructure and friction and wear properties of Ni60-WC-Cu coating prepared by laser on copper alloy surface
Laser cladding coating is a method to solve the failure of copper alloy parts caused by friction and wear.However,due to the high reflectivity and high thermal conductivity of copper alloy to laser energy,it is a difficult problem to prepare coating on the surface of copper alloy by laser.In this paper,Ni60-WC-Cu composite coatings with different mass fractions of WC were prepared on the surface of copper substrate.The phase structure,microstructure and microhardness of the coatings were analyzed.The wear resistance and wear mechanism of the coatings were studied by friction and wear test.The results show that the phase in the coating is mainly NiW,and its peak value increases with the increase of WC content.When the WC mass fractions are 20%and 25%,a large number of cellular and dendritic structures are observed in the cladding zone,and agglomerated hard phases appear at the top of the coating.The hardness of the coating is higher than that of the substrate,and the average hardness of the coating with WC content of 25%is 908.4HV.The wear resistance of the coating is better than that of the copper alloy substrate.With the increase of WC mass fraction,the wear resistance of the coating gradually increases and is better than that of the substrate,oxidation wear,fatigue wear and abrasive wear.When the WC content is 25%,the coating shows the best corrosion resistance;when the WC content is 20%,it shows good conductivity.
laser claddingcopper alloycomposite coatingmicrostructurefriction and wear
NETL
NSTL
万方数据
维普
