Abstract
In order to improve the wear resistance of Cu, a Ni/Mo composite coating was applied on the surface of Cu alloy by means of laser cladding. The laser power was 6000 W, the scanning speed was 5 mm/s and the feed rate was 10 g/min. The transition layer of the Ni layer had three layers, and the surface layer of the Mo layer had two layers. The results showed that the surface of the cladding layer was pure Mo. Due to the fluidity and non-equilibrium solidification of Mo in the molten state, pores and cracks along the grain boundary were observed in the Mo layer. The results showed that the cross-section of cladding layer was divided into a pure Mo layer, Mo-Ni-Cu mixed layer and an Ni-Cu mixed layer. The surface hardness of the Mo layer was 200~460 HV. Ni3Mo was formed at the interface of Mo and Ni. The hardness was improved by Ni3Mo; the maximum hardness was 750 HV. Under the same load and wear time, the wear rate of Cu was three times that of the surface layer.
Highlights
Formation Mechanism andThe electromagnetic gun is a typical electromagnetic launching device that uses magnetic force to accelerate projectiles to 2–3 km/s [1]
The Ni/Mo composite coating was prepared on the surface of the Cu alloy by laser
This was because that the Ni layer was first prepared, and the Mo layer was prepared on the surface of the Ni layer in the process of laser preparation of the composite coating
Summary
The electromagnetic gun is a typical electromagnetic launching device that uses magnetic force to accelerate projectiles to 2–3 km/s [1]. Laser cladding [4,5,6] involves adding cladding material onto the surface of the substrate and using a high-density laser beam to clad the cladding layer to form a metallurgical coating. It has the characteristics of high power density, a small heat-affected zone, and rapid melting and cooling between the coating and the substrate It is widely used in the surface modification of metal materials. Liu [7] carried out a study on H62 brass as a guide rail, which proved that the Cu guide rail had excellent thermal and electrical conductivity It would cause serious wear, this failure of the Cu guide rail meant that it could not meet the requirements of the electromagnetic performance. The microstructure and wear resistance were studied to provide support for the process optimization
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