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Method for depositing low-stress coating by utilizing supersonic speed laser

A technology of supersonic laser and deposition method, which is applied in the direction of coating, metal material coating process, etc., which can solve the problems of easy peeling off of coating, reduction of coating porosity, and difficulty in effective deposition, etc., to increase spraying thickness and improve Large internal stress, prevents the effect of being too thick and easy to peel off

Active Publication Date: 2014-08-27
ZHEJIANG UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the pure cold spraying technology still has the following disadvantages: 1) When preparing high-quality coatings, high-pressure helium gas needs to be used, which greatly increases the cost; 2) For particles with higher hardness (such as iron-based, nickel-based, cobalt-based etc.), it is difficult to achieve effective deposition; 3) The bonding mechanism between the coating and the substrate is mainly mechanical occlusion, so the bonding force of the coating is poor
[0005] Although compared with cold spraying technology, supersonic laser deposition technology has achieved effective deposition of high hardness particles, improved coating adhesion, and reduced coating porosity, but there are still the following during the preparation of high hardness coatings Disadvantages: 1) When the hardness of the deposited particles exceeds 50HRC, the coating has pores due to insufficient plastic deformation of the high-hardness particles; 2) Due to the heating effect of the laser, the high-hardness coating has a large internal stress and is prone to cracking; 3) Due to the high Hardness The thermal expansion coefficient and hardness of the coating and the substrate are different, the bonding force between the coating and the substrate is poor, and the coating is easy to peel off; 4) Due to the limitation of the material and size of the sprayed parts, it is difficult to use other heat treatment methods to remove the internal stress of the coating

Method used

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  • Method for depositing low-stress coating by utilizing supersonic speed laser
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  • Method for depositing low-stress coating by utilizing supersonic speed laser

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example 1

[0034] Select hard phase particles Ni60 with a particle size of 10-20 μm, soft phase particles Ni with a particle size of 30-50 μm, and the powder shape is spherical or ellipsoidal; add soft phase Ni particles according to the mass ratio of 15%, and then The composite powder is mechanically alloyed in a type ball mill, the ball-to-material ratio is 40:1, the ball milling time is 2h, and the rotation speed is 500r / min to obtain a uniformly mixed Ni60 / Ni composite powder; then the coating is prepared by laser supersonic deposition technology , the substrate is 45# steel plate with a size of 100×50×10mm, and the surface of the substrate is sandblasted with 24# white corundum before spraying; the carrier gas for cold spraying is compressed nitrogen, the nitrogen preheating temperature is 500°C, the nitrogen pressure is 3MPa, and the powder feeding amount 50g / min, the spraying distance is 30mm, the moving speed of the spray gun is 30mm / s, the laser is heated synchronously in the spr...

example 2

[0036]Select hard phase particles stellite6 with a particle size of 10-20 μm, soft phase particles Co with a particle size of 30-50 μm, and the powder shape is spherical or ellipsoidal; add soft phase Co particles according to the mass ratio of 10%, and then The composite powder was mechanically alloyed in a type ball mill, the ball-to-material ratio was 30:1, the ball milling time was 3 hours, and the rotation speed was 400r / min to obtain a uniformly mixed stellite6 / Co composite powder; then the coating was prepared by laser supersonic deposition technology , the substrate is a stainless steel plate of 100×50×10mm, and the surface of the substrate is sandblasted with 24# white corundum before spraying; the carrier gas for cold spraying is compressed nitrogen, the nitrogen preheating temperature is 550°C, the nitrogen pressure is 3MPa, and the powder delivery volume is 50g / min, the spraying distance is 30mm, the moving speed of the spray gun is 30mm / s, the laser is heated sync...

example 3

[0038] Select the hard phase particles Ni45 with a particle size of 10-20 μm, and the soft-phase particles Co with a particle size of 30-50 μm. The powder shape is spherical or ellipsoidal; The composite powder is mechanically alloyed in a type ball mill, the ball-to-material ratio is 30:1, the ball milling time is 3h, and the rotation speed is 600r / min to obtain a uniformly mixed Ni45 / Co composite powder; then the coating is prepared by laser supersonic deposition technology , select 45# steel rod for the substrate, and use 24# white corundum sandblasting on the surface of the substrate before spraying; the carrier gas for cold spraying is compressed nitrogen, the nitrogen preheating temperature is 400°C, the nitrogen pressure is 2.5MPa, and the powder delivery rate is 50g / min. The spraying distance is 20mm, the moving speed of the spray gun is 30mm / s, the laser is heated synchronously in the spraying area, and the laser power density is 3×105W / cm 2 ; The thickness of the pre...

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Abstract

The invention discloses a method for depositing a low-stress coating by utilizing supersonic speed laser. Hard phase particles and soft phase particles with appropriate particle size and shape are subjected to ball-milling mixing in certain proportion, and the mixed powder particles are subjected to supersonic speed laser deposition on pretreated matrixes of different materials and shapes, so that the low-stress coating is obtained. According to the technical scheme, the soft phase is uniformly distributed in a high hardness coating, great plastic deformation is formed, and internal stress in the coating can be absorbed and eliminated, so that a compact and crack-free coating is obtained; besides, on the interface of the coating and the matrixes, a soft phase enrichment layer is generated in situ, transition action on bonding of the high hardness coating and the matrixes is realized, and interface bonding strength of the coating / matrixes is obviously improved.

Description

technical field [0001] The invention relates to the technical field of supersonic laser deposition, in particular to a method for eliminating the internal stress of a supersonic laser deposited high-hardness coating in situ and simultaneously improving the bonding force between the coating and a substrate. Background technique [0002] Cold spraying is also called cold gas dynamic spraying (Cold Gas Dynamic Spray, CGDS), which uses compressed gas (helium, nitrogen, air or mixed gas, etc.) as the acceleration medium to carry solid particles into the Laval nozzle (Laval nozzle) A supersonic gas-solid two-phase flow is generated inside, and the solid particles collide with the surface of the substrate at a very high speed (greater than or equal to its critical deposition velocity) after acceleration, so that the particles and the substrate undergo strong plastic deformation at the same time to form a coating. New spraying technology. Compared with thermal spraying, a remarkabl...

Claims

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Application Information

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IPC IPC(8): C23C24/10
Inventor 姚建华杨理京李波李祉宏
Owner ZHEJIANG UNIV OF TECH
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