Abstract
The supersonic laser deposition (SLD) of diamond/Cu composite powder is studied over a range of laser power. The deposition efficiency, coating microstructure, cohesive/adhesive bonding, phase composition, micro-hardness, and tribological property of the diamond/Cu composite coating are investigated. The results indicate that, as laser power is increased, deposition efficiency initially increases and then declines. The diamond particles distribute uniformly in the composite coating. Due to the increase of velocity ratio and total energy by laser irradiation, the cohesive/adhesive bonding of the composite coating is improved. The composite coating can preserve the phase composition of the origin powders due to the relatively low heat input during the SLD process. Slight oxidation of the Cu powder can be detected in the coatings prepared with high laser power, which has adverse effects on material deposition. The SLD-diamond/Cu composite coating has superior wear-resistance because of low friction coefficient, high micro-hardness, and uniformly distributed diamond particles.
Highlights
Owing to extremely high hardness, diamonds are often used as reinforcement particulates in ceramic-metal composite coatings to enhance the surface properties of cutting tools for manufacturing processes [1,2]
This implies that laser irradiation did not benefit the diamond retention in the composite coatings, which is different from the results reported previously for supersonic laser deposition (SLD) diamond/Ni60 composite coatings [33]
The diamond/Cu composite coatings on Cu substrate were fabricated via the SLD process in a range of laser powers
Summary
Owing to extremely high hardness, diamonds are often used as reinforcement particulates in ceramic-metal composite coatings to enhance the surface properties of cutting tools for manufacturing processes [1,2] It has exceptional characteristics such as superior wear-resistance, excellent thermal conductivity, chemical inertness and low friction coefficient, in addition to extremely high hardness [3,4]. The common methods to fabricate diamond particulate-reinforced composite coatings include thermal spray [5,6,7] and laser cladding [8,9] These technologies mostly involve high working temperatures to totally or substantially melt the binder phase in the composite coatings and the surface of underneath substrate. In the CS process, micro-sized powder particles are accelerated to exceed critical deposition velocity in a converging-diverging Laval nozzle by a supersonic inert gas stream and
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
