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Method for preparing hard particle coating on hard substrate through laser-assisted cold spraying

A hard particle, laser-assisted technology, applied in the field of laser technology and cold spraying, can solve problems such as inability to apply hard particle coating, and achieve the effect of improving plastic deformation capacity

Active Publication Date: 2013-12-25
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The characteristics of this method are: (1) the use of inert gas or reducing gas without oxygen as the driving gas, the cost is lower than that of helium used in cold spraying; (2) the examples listed are limited to softer substrates Spraying softer particles, such as pure copper, pure aluminum, 316L substrates and pure copper, pure aluminum, 316L, pure nickel, pure titanium and other particles, cannot be applied to obtain hard particle coatings on hard substrates

Method used

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  • Method for preparing hard particle coating on hard substrate through laser-assisted cold spraying

Examples

Experimental program
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Effect test

Embodiment 1

[0021] The 45 steel cylinder was sandblasted as the substrate, and Ni45 spherical particles with a particle diameter of 30 microns were selected for laser-assisted cold spraying. The laser is a fiber laser with a power density of 3×10 5 W / cm 2 . The high-pressure gas is 1.5MPa compressed air, and the particles are preheated to a temperature of 600°C. The 45 steel cylinder is rotated through the machine tool control, and at the same time, the powder is fed, and the laser is activated to heat the spraying area synchronously, forming a hard particle coating on the surface of the 45 steel cylinder. Metallographic photographs of Ni45 deposited coatings as figure 1 As shown, it can be clearly seen that the particles collide, deform and bond together.

[0022] However, when no laser heating was added, no deposition was formed on the substrate no matter how the parameters were adjusted.

Embodiment 2

[0024] S43C low-carbon steel was sandblasted as the substrate, and Ni60 material with a particle diameter of 40 microns was selected for laser-assisted cold spraying. The laser is a semiconductor laser with a power density of 4×10 5 W / cm 2 . The high-pressure gas is 3.0MPa compressed air, the preheating temperature of the particles is 500°C, start the powder feeding, use the Staubli manipulator to control the nozzle to the starting point, start the laser, and complete the flat spraying. During the spraying process, the laser heats the spraying area synchronously. The metallographic photos of the prepared hard particle coating are as follows: figure 2 As shown, it can be clearly seen that the particles are plastically deformed by impact and combined together, and the microhardness is measured to be 610HV.

[0025] However, when no laser heating was added, no deposition was formed on the substrate no matter how the parameters were adjusted.

Embodiment 3

[0027] The 45 steel plate was sandblasted as the substrate, and the Ni60 material with a particle diameter of 50 microns was selected for laser-assisted cold spraying. The laser is a semiconductor laser, and the power density used is 5×10 5 W / cm 2 . The high-pressure gas is 3.0MPa compressed air, and the particle preheating temperature is 600°C. At the same time, the Staubli manipulator is controlled to control the nozzle movement and start powder feeding, and start the laser to synchronously heat the spraying area to form a deposited coating on the surface of the substrate.

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Abstract

The invention discloses a method for preparing a hard particle coating on a hard substrate through laser-assisted cold spraying. The method comprises the following steps: subjecting the hard substrate to sand blasting, wherein the hardness of the hard substrate is 300 HV; preheating a spherical hard particle with a diameter in a range of 30 to 50 mu m, wherein preheating temperature is 300 to 600 DEG C, and the hard particle is one or more selected from the group consisting of 2Cr13, 17-4PH, Ni45, Ni60 and Inconel718; carrying out spraying on the surface of the hard substrate by using compressed air having a pressure of 1.5 to 3.0 MPa and carrying the preheated hard particle; and starting laser to synchronously heat a spraying area so as to form the hard particle coating on the surface of the hard substrate, wherein laser power density is 3*10<5> to 5*10<5> W / cm<2>, and wavelength is 850 to 1060 nm. The method provided by the invention can substantially improve plastic deformation generated during collision between the hard particle and the substrate, so the binding force of the coating is improved; thus, the coating with higher stability is obtained.

Description

(1) Technical field [0001] The invention relates to laser technology and cold spraying technology, in particular to compressed air-driven laser-assisted cold spraying technology, in particular to a method for obtaining a hard particle coating on a hard substrate by laser-assisted cold spraying. (2) Background technology [0002] Because the cold spray technology eliminates the adverse effects of high temperature on the coating and the substrate, avoids oxidation and the generation of unnecessary phases, it is of great significance for the preparation of coatings of materials that are easily oxidized. Current research shows that cold spraying can realize metal ceramics including Al, Zn, Cu, Ni, Ca, Ti, Ag, Co, Fe, Nb, NiCr alloy, MCrAlY alloy, high melting point Mo, Ta and high hardness Cr5C2- The preparation of 25NiCr, WC-21Co and other coatings can realize the preparation of composite coatings or alloy coatings and nano-material coatings with different materials, and can fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/08
Inventor 姚建华孔凡志陈智君董刚张群莉胡晓冬
Owner ZHEJIANG UNIV OF TECH
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