Novel supersonic arc spray gun, spraying device and method for preparing fe-cr-ni composite coating

Abstract

The invention discloses a novel supersonic-speed arc spray gun. The spray gun comprises a high-pressure air input pipe and two wire guide pipes, and further comprises a mounting base, a combustion chamber housing, a protective housing, an ignition device and a catalytic ceramic wafer; fuel is fully mixed with compressed air by use of the ceramic wafer; after being accelerated through an atomizing nozzle, the mixture of the fuel and the compressed air realizes a supersonic-speed gas jet; the supersonic-speed gas jet is used for performing ultra-fine atomization on a molten arc wire; metal particles can be accelerated so that a speed thereof can be above 800m / s, and therefore, properties of a coating can be greatly improved. The invention further discloses a spraying device comprising the novel supersonic-speed arc spray gun and a preparation method for preparing a Fe-Cr-Ni composite coating. On the basis of the device and the process provided by the present invention, the particle speed of arc spraying can be effectively increased and the high-performance Fe-Cr-Ni composite coating high in bonding strength, high in hardness, low in porosity, low in oxidation rate and the like can be obtained; the high-performance Fe-Cr-Ni composite coating can be applied to surfaces of workpieces such as sluice gates, boiler pipe walls, piston rods and so on.

Description

Technical field: [0001] The invention relates to the field of surface strengthening and remanufacturing, relates to an electric arc spray gun, a spray coating device and a method for preparing Fe-Cr-Ni composite coating, in particular to a novel supersonic arc spray gun, a spray coating device comprising the spray gun, and a method using the A method for preparing a Fe-Cr-Ni composite coating with a spraying device. Background technique: [0002] Thermal spraying is widely used in various fields of industrial production, such as turbine blades, valves, gates, piston rods, steel structure bridges, etc., which can effectively improve the wear resistance, corrosion resistance, fatigue resistance and other properties of the equipment surface, and play a role in improving the performance, Extend the service life and so on. According to the classification of heat sources, thermal spraying is mainly divided into: supersonic flame thermal spraying, plasma thermal spraying and arc t...

AI Technical Summary

Problems solved by technology

Only increasing the particle speed of arc spraying will not be able to meet the requirements, and the traditional way of arc spraying aluminum, zinc, magnesium, copper and other alloys, due to the low hardness (200HV 0.2 About), poor wear resistance, can not meet the requirements, need to choose more advanced spraying equipment, spraying method and new alloy wire, such as Fe-Cr-Ni alloy, etc.

The current arc spraying device cannot complete the spraying of this type of cemented carbide wire very well

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