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Supersonic laser deposition micro shot peening method and spraying device

A supersonic laser and shot peening technology, applied in the method and spraying device, in the field of supersonic laser deposition micro shot peening, can solve the problems of low deposition efficiency, poor bonding strength and high porosity, and achieve elimination of high porosity and reduction of porosity. rate, improved wear resistance and corrosion resistance

Pending Publication Date: 2022-03-29
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the shortcomings of low deposition efficiency, poor bonding strength, high porosity and poor performance in the repair layer prepared by the above-mentioned existing cold spray technology, the purpose of the present invention is mainly to provide a supersonic laser deposition micro-peening method, the laser beam is introduced synchronously during the cold spraying process, 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 problem of single cold spraying. There are many bad problems in the coating prepared by spraying, which greatly improves the comprehensive performance of the composite coating

Method used

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  • Supersonic laser deposition micro shot peening method and spraying device
  • Supersonic laser deposition micro shot peening method and spraying device
  • Supersonic laser deposition micro shot peening method and spraying device

Examples

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Embodiment 1

[0043] Embodiment 1 A method of supersonic laser deposition micro-peening, specifically comprising the following steps:

[0044] Take the part to be repaired as the base material, firstly polish the base material, and then use 24# white corundum to perform sandblasting treatment under the air pressure of 1.0MPa to improve the surface roughness and remove surface oxides, and then put it into an ultrasonic cleaning machine Wash to remove surface impurities, then wash with absolute ethanol, then wipe dry and put it in a vacuum drying oven to preheat (temperature 120°C, time 0.5h), and fix the treated substrate on the workbench. Spherical particles of large particle size alumina (particle size is 120 ~ 150μm, such as figure 1 As shown, the alumina volume ratio is 30vol.%) and Cu powder are fully mechanically mixed (ball milled at 300rpm for 30min) and then dried (dried at a drying temperature of 120°C for 3 hours), and then poured into a powder feeder. Set the spray carrier gas (...

Embodiment 2

[0045] Embodiment 2 The spraying device constructed according to the method of supersonic laser deposition micro-peening described in the present invention includes cold spraying equipment 100, laser equipment 200, carrier gas supply equipment 300 and mobile equipment, and the mechanical arm of the mobile equipment is suspended Above the workbench 400, the cold spray equipment 100 includes a powder feeder, a gas heater 3, a cold spray gun 5 and a power supply 4, and the powder feeding port of the powder feeder 2 is connected to the inlet of the cold spray gun 5. The powder port pipeline is connected; the gas heater 3 is provided with a heating channel, and the voltage input end of the gas heater 3 is electrically connected to the voltage output end of the power supply 4;

[0046] The laser device 200 includes a laser head 6 and an infrared detector 7, and the laser head 6 and the cold spray gun 5 are fixedly arranged on the mechanical arm of the mobile device at the same time, ...

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Abstract

The invention provides a supersonic laser deposition micro shot peening method. The supersonic laser deposition micro shot peening method comprises the following steps that the surface of a to-be-repaired part is pretreated; a mixed spraying material is manufactured, then a laser beam is introduced in the cold spraying process, supersonic laser deposition micro shot peening is carried out on the pretreated to-be-repaired part, then aftertreatment is carried out on a workpiece repairing layer, and a qualified repaired part can be obtained. The invention further comprises a spraying device which comprises cold spraying equipment, laser equipment, carrier gas supply equipment and moving equipment, a mechanical arm of the moving equipment is suspended above the workbench, and the cold spraying equipment comprises a powder feeder, a gas heater, a cold spraying gun and a power source; the laser equipment comprises a laser head and an infrared detector; the carrier gas supply equipment comprises a gas cylinder group, a gas conveying pipeline and a control valve. The method has the beneficial effects that due to the introduction of the laser beam, the deposition efficiency and the bonding strength of the soft metal material are greatly improved compared with single cold spraying, and the defect that the porosity in a repairing layer is high is overcome.

Description

technical field [0001] The invention belongs to the field of laser composite processing, and in particular relates to a supersonic laser deposition micro-peening method and a spraying device. Background technique [0002] Some soft metals and their alloys have good ductility, electrical and thermal conductivity, and are often used in the power and information transmission industries. For parts that work in sliding friction and corrosive environments for a long time, surface wear and surface corrosion are prone to occur , causing the parts to fail, but the cost of replacing the parts is too high. We can repair the surface of the failed parts. In order to minimize the impact of the repair work on the original substrate, cold spraying technology is often applied, but the repair layer obtained by cold spraying technology The density and strength are not good enough, and the available powder materials are also limited. [0003] In order to improve the performance of the repair l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/04C21D10/00
CPCC23C24/04C21D10/005Y02P10/20
Inventor 张杰孙启帆李波姚建华
Owner ZHEJIANG UNIV OF TECH
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