Directional ultrahigh-velocity spraying method and device based on laser induced shock wave technology

Abstract

The invention discloses a directional ultrahigh-velocity spraying method and device based on a laser induced shock wave technology, belonging to the technical field of part processing and remanufacturing. According to the spraying method, a high-temperature electric arc generated by an electrode is firstly used for heating and melting spray wires of a coating material to form molten drops and the molten drops fall off and are atomized into a microdrop stream; then a laser pulse beam is used for irradiating the surface of the microdrop stream; a part of microdrops on the surface absorb laser energy and are instantly gasified and ionized into high-pressure plasma; the high-pressure plasma further absorbs laser energy and expands and blows up to form high-pressure shock waves at GPa grade; the high-pressure shock waves drive the corpuscular stream to jet onto the surface of a workpiece at a high velocity to form a coating. The spraying device comprises a laser generator, a beam guiding and splitting system, an electric arc liquid making system, a workpiece clamp system, a recycling system and a control system. The spraying device can be used for realizing high-velocity high-efficiency spraying; the combination strength of the coating and a substrate is good; the coating has high density and low void content and also has relatively high thermal fatigue resistance and mechanical fatigue resistance.

Description

Technical field: [0001] The invention relates to the technical field of parts processing and remanufacturing, in particular to a method and device for using laser-induced shock waves to boost particles to crash into workpieces at high speed to form a coating on the surface, especially suitable for directional, long-distance high-speed spraying. Background technique: [0002] With the development of science and technology, people have proposed many methods to propel objects forward, such as laser propulsion, electromagnetic field propulsion, nuclear reaction propulsion and so on. Among them, the laser propulsion method is superior to other methods in many performance indicators, and it is relatively easy to realize technically. There are two modes of laser propulsion: one is "atmospheric breathing mode"; the other is "ablation mode". Atmospheric breathing mode means that the laser pulse penetrates the air in the atmosphere through the optical system to generate a plasma expl...

AI Technical Summary

Problems solved by technology

However, this technology has the disadvantages of difficult control of explosion parameters, poor safety, and high noise. It needs to be carried out in a special soundproof room, and due to intermittent operation, the spraying efficiency is low.

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