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Cold air power spraying and coating method containing laser irradiation

A technology of cold air power spraying and laser irradiation, applied in the direction of heating inorganic powder coating, etc., can solve problems such as sticking throat, low radiation heating efficiency, phase change, etc., and achieve the effect of small thermal influence

Active Publication Date: 2008-04-02
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, increasing the temperature of high-pressure compressed gas puts forward very high technical requirements for equipment design and materials, and safety is difficult to guarantee.
Increasing the temperature of the particles is prone to throat sticking, and at the same time, it is easy to cause changes in the grain length and phase transition of the sprayed particle structure, which affects the performance of the coating, and the radiation heating efficiency is low, and it will be rapidly cooled by the cooling effect of the high-speed airflow.
Microwave heating will be reflected by metal particles, affecting the actual heating effect

Method used

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  • Cold air power spraying and coating method containing laser irradiation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Choose a pure copper substrate, and choose pure copper particles as the spraying material. In the absence of laser irradiation, the driving gas is an inert gas composed of nitrogen plus 8% helium, and the pressure of the driving gas is gradually increased from 0.5MPa. The measured critical velocity of copper particles on the pure copper plate is 498m / s. When the laser irradiation is increased, the angle between the laser and the particle beam is 30°, the temperature of the substrate in the laser spot area after laser irradiation is 500°C, and the measured critical velocity of the copper particles on the pure copper plate is 380m / s. The critical speed required for bonding was significantly reduced by 23.7%.

Embodiment 2

[0035] Choose pure aluminum substrate and choose pure aluminum particles as spraying material. In the absence of laser irradiation, the driving gas is an inert gas composed of nitrogen plus 8% helium, and the pressure of the driving gas is gradually increased from 0.5MPa. The measured critical velocity of aluminum particles on the pure aluminum plate is 650m / s. When the laser irradiation is increased, due to the strong reflection of aluminum, the angle between the laser and the particle beam is 45°, the temperature of the substrate in the laser spot area after laser irradiation is 350°C, and the measured copper particles adhere to the pure copper plate. The critical speed when connecting is 447m / s. The critical speed required for bonding was significantly reduced by 31.2%.

Embodiment 3

[0037] Choose pure 316L stainless steel substrate, choose 316L stainless steel particles as spraying material. In the absence of laser irradiation, the driving gas is an inert gas composed of nitrogen plus 8% helium, and the pressure of the driving gas is gradually increased from 0.5MPa. The measured critical velocity of 316L stainless steel particles on the 316L stainless steel plate is 710m / s. When the laser irradiation is increased, the angle between the laser and the particle beam is 25°, the temperature of the substrate in the laser spot area after laser irradiation is 550°C, and the measured critical velocity of the 316L stainless steel particles on the 316L stainless steel plate is 578m / s. The critical speed required for bonding was reduced by 18.5%.

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Abstract

The invention relates to the cold gas dynamic spray technology and the laser technology, in particular to a cold gas dynamic spray method comprising laser irradiation, wherein, compressed gas which carries with metallic powder impacts against the surface of a plaque at supersonic speed to form a circular spray spot on the surface of the plaque; meanwhile, an elliptic irradiation laser speckle is formed directly ahead of the circular spray spot through laser beam irradiation; moreover, the elliptic irradiation laser speckle and the circular spray spot are partly overlapped. The invention can substantially reduce the particle critical speed during cold gas dynamic spray and increases splicing efficiency and strength to ensure structural stability of spray particles, thereby improving coating performance.

Description

(1) Technical field [0001] The invention relates to cold air power spraying technology and laser technology, in particular to a cold air power spraying method containing laser irradiation. (2) Background technology [0002] The cold air power spraying technology uses high-pressure compressed gas as the power to drive tiny metal particles to hit the surface of the base material at high speed. When the speed of the sprayed particles exceeds a certain speed, the sprayed particles undergo strong plastic deformation on the surface of the material and bond. The surface forms a coating. In the cold air power spraying technology, the temperature of the gas is generally less than 850K, which is far lower than the melting point of the spraying material, and the spraying particles are bonded in a solid state. Therefore, the cold air dynamic spraying technology has unique advantages that other thermal spraying technologies do not have, for example, the heat input to the substrate is sm...

Claims

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Application Information

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IPC IPC(8): C23C24/08
Inventor 张俊宝方园宋洪伟梁永立
Owner BAOSHAN IRON & STEEL CO LTD
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