Method for preparing aluminum oxide reinforced copper-based wear-resistant, heat-conducting and electric-conducting coating through laser-assisted low-pressure cold spraying

Abstract

The invention provides a method for preparing an aluminum oxide reinforced copper-based wear-resistant, heat-conducting and electric-conducting coating through laser-assisted low-pressure cold spraying. The method comprises the following steps that a laser beam is synchronously introduced in a low-pressure cold spraying process, powder particles are softened but not melted under the irradiation action of laser, a matrix is heated at the same time, the critical deposition velocity of powder is reduced, the deposition efficiency of the powder is improved, the binding force of the coating is improved, and the porosity of the coating is reduced; and irregular aluminum oxide particles are added into the copper powder to enhance the wear resistance of the coating, so that the content of aluminum oxide in the coating is low, the mechanical performance is good, many problems of the copper coating prepared through single low-pressure cold spraying are solved, the wear resistance is greatly improved while the heat conduction and electric conduction performance is kept, the comprehensive performance of the composite coating is good, the resource utilization rate is high, and the green development concept is met.

Description

technical field [0001] The invention belongs to the field of laser composite processing, and in particular relates to a method for preparing an alumina-reinforced copper-based wear-resistant, thermally and electrically conductive coating by laser-assisted low-pressure cold spraying. Background technique [0002] Copper and its alloys have strong ductility and electrical and thermal conductivity, but sometimes parts made of copper and its alloys are used in a sliding friction environment for a long time, and the work intensity is high, resulting in easy wear of the contact surface and deformation of the parts, so that The thermal conductivity and electrical conductivity are reduced. For some signal transmission parts, it will also cause signal distortion and disappearance. For example, locomotive pantograph plate (skateboard material), connector (docking interface material), motor (brush material), these parts are mainly made of copper and copper alloy, and they have been in...

AI Technical Summary

Problems solved by technology

[0005] In view of the disadvantages of low deposition efficiency, poor bonding strength, high porosity, and serious decline in thermal and electrical conductivity of the aluminum oxide-reinforced copper-based coatings prepared by the existing low-pressure cold spraying, the present invention provides a laser-assisted low-pressure cold spraying preparation Method for Reinforcing Copper-Based Wear-Resistant, Thermally and Conductively Conductive Coatings with Aluminum Oxide

[0006] The invention introduces the laser beam synchronously in the low-pressure cold spraying process, and through the irradiation of the laser, the powder particles are softened but not melted, the critical deposition speed of the powder is reduced, the deposition efficiency of the powder is improved, and the bonding force of the coating is improved to solve the single There are many bad problems in the coating prepared by cold spraying, which greatly improves the comprehensive performance of the composite coating

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