Method and device of laser impact and thermal spraying composite coating preparation

Abstract

A method and a device of laser impact and thermal spraying composite coating preparation relates to the nontraditional machining field. At first, the invention uses a thermal spraying device to spay powder onto the surface of a metal substrate in order to form a coating. The invention is characterized in that laser is used to impact the metal substrate surface coated with the coating and the coating which has low porosity, high bonding strength and compression stress is formed. The device implementing the method comprises a computer control device, a thermal spraying system I, a laser impact system II, a sealed treatment room, a clamping device, a five-axis workbench and a vacuum pump, which are connected in turn. The thermal spraying system I comprises the thermal spraying device and sprayed powder. The laser impact system II comprises a nanosecond laser generator, laser beam, a light pipe, a 45 degrees totally reflective mirror, a facula adjusting device, a K9 glass window and an automatic spraying system. The invention can form the coating on the surface of the metal, increase the porosity of the coating, improve the bonding strength of the coating and the substrate and change the state of residual stress.

Description

Technical field [0001] The invention relates to the field of special processing, in particular to a method and device for composite preparation of laser shock and thermal spraying, and is particularly suitable for the preparation of metal coatings with a wear-resistant and fretting-resistant structural metal surface of less than 1 mm. Background technique [0002] The surface properties of structural metals are critical to the mechanical properties, fatigue properties and corrosion resistance of structural parts. At present, various coating technologies such as thermal spraying technology, plasma spraying, brush plating technology, high-speed arc spraying technology, plasma arc cladding Technology, etc., can greatly improve the surface properties of structural metals, and can obtain good gain effects. [0003] The Fang Ming patents closest to this method are "Metal Thermal Spraying and Powder Coating Electrostatic Spraying Composite Coating Anticorrosion Process (Patent Application...

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Problems solved by technology

[0004] Although these technologies can prepare uniform coatings with certain properties on the surface of the metal substrate, the above-mentioned technologies and the brush plating technology all produce thermal effects during the coating process, and the prepared coatings have large porosity and residual Tensile stress state, prone to surface micro-cracks leading to fracture and failure of structural metal parts

Aviation turbine disc seals, turbine engine blades, metallurgical rolls and other components work in harsh environments. These components have reduced engine efficiency due to fretting wear and short service time due to high temperature and high erosion. The existing above-mentioned technologies prepare coatings The wear resistance and anti-fretting wear performance cannot meet the needs of harsh engineering environments

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