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Laser-assisted cold spraying method for manufacturing additives

An additive manufacturing and laser-assisted technology, which is applied in the field of laser-assisted cold spray additive manufacturing, can solve the problems affecting the quality of cold spray additive manufacturing, affecting the effect of cold spray additive manufacturing, and the combination of coating and substrate is not tight enough. Achieve the effect of improving the internal bonding quality, good effect and simple structure

Inactive Publication Date: 2019-01-08
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, in the process of additive manufacturing using cold spray technology, the coating is not tightly combined with the substrate, and the overall coating is prone to fall off, which greatly affects the effect of cold spray additive manufacturing.
At the same time, due to the compaction effect in the cold spraying process, the deposited particles will have a process of compaction and secondary plastic deformation on the deposited material, which will lead to a higher density in the lower part of the accumulation layer, while the surface layer of the accumulation layer will have a higher density. A certain amount of porosity, which can greatly affect the quality of cold spray additive manufacturing

Method used

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Embodiment approach

[0023] (1) Preheating the substrate by preheating the laser can make the surface of the substrate reach a higher active state, thereby improving the bonding effect of cold spray deposition. After the substrate is polished, the oxide layer is removed, etc., the preheating laser is used to preheat the substrate, which can improve the bonding strength of the cold spray buildup coating and the substrate. The laser power of the preheating laser depends on the composition and properties of the substrate. Generally, a low-power laser is used. The temperature of the substrate is raised to 300-400°C by adjusting the preheating laser, and is at least 200°C lower than the melting point of the substrate. If the temperature of the substrate is not lower than the melting point of the substrate by 200°C, the preheated substrate temperature can be reduced to below 300°C.

[0024] (2) The use of cold spray technology to perform additive stacking on the preheated substrate includes: the cold spray...

Embodiment 1

[0034] Such as figure 1 As shown, a laser-assisted cold spray additive manufacturing method includes the following steps:

[0035] Step a: Preheat the aluminum alloy 2219 sheet as the base material by using a low-power laser to increase the temperature of the base material to 300° C., thereby obtaining the preheated base material.

[0036] Step b. Using cold spraying technology to add material to the preheated substrate at a higher temperature, the cold spray gas preheating temperature is 500°C, and the powder particles used for additive stacking are 2219 aluminum with a size of 5-50 μm Alloy particles, the powder feeding rate is 30g / min, and the powder feeding distance is 25mm; the cold spray acceleration gas uses nitrogen; at the same time, the synchronous laser is used to simultaneously perform surface treatment on the cold spray layer deposited by the additive. The laser power of the synchronous laser The laser gun head and the cold spray nozzle move synchronously to realize th...

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Abstract

The invention discloses a laser-assisted cold spraying method for manufacturing additives. The method comprises the following steps: preheating a base material by preheating laser to enable the temperature of the base material to be raised to 300-400 DEG C and lower than the melting point of the base material by at least 200 DEG C to obtain a preheated base material; performing additive accumulation on the preheated base material with a cold spraying technology, and performing surface treatment on cold sprayed coatings obtained by additive accumulation synchronously by synchronous laser. The accumulation combination effect of cold spraying additive manufacturing can be substantially improved, the accumulation coatings are not prone to falling off, accumulation efficiency is higher, flexibility is better, quality of the additives is substantially improved, and surface molding can be effectively controlled.

Description

Technical field [0001] The invention relates to the field of cold spraying additive manufacturing, in particular to a laser-assisted cold spraying additive manufacturing method. Background technique [0002] Cold spraying technology is an emerging surface forming technology. It uses preheating and high pressure to impact powder particles at a higher speed on the substrate and deposit them on the surface of the substrate through greater plastic deformation, thereby forming a coating; Cost, fast and efficient, uniform organization, high flexibility, 100% recyclable and other advantages. [0003] Cold spray technology was originally widely used in the field of material protection and structural parts repair, and has now developed into a new type of additive manufacturing technology. However, in the process of additive manufacturing using cold spray technology, the coating and the substrate are not tightly bonded, and the phenomenon of overall coating falling off is easy to occur, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/04B22F3/105B33Y10/00
CPCC23C24/04B33Y10/00B22F10/00B22F10/36B22F10/32B22F10/25B22F10/50B22F12/17Y02P10/25
Inventor 张华赵常宇窦程亮邵童阁郭启龙
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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