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Aluminum-silicon alloy powder for 3D printing and preparation method thereof

An aluminum-silicon alloy and 3D printing technology, applied in metal processing equipment, transportation and packaging, additive processing, etc., can solve the technical difficulty of increasing raw material powder preparation and printing, fail to control the performance of aluminum powder from the source, and cannot be large Large-scale production and other issues, to achieve the effect of convenient and fast preparation technology, excellent mechanical properties, and narrow particle size distribution

Inactive Publication Date: 2020-09-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the powder raw material preparation technology currently used in China either produces poor product performance, or the preparation technology is complicated, the cost is high, and it cannot be mass-produced
[0005] Patent 201810323621.1 proposes to optimize the performance of printed products by forming spherical metal aluminum powder wrapped with octamethylcyclotetrasiloxane organic silicon thin film to avoid problems such as oxidation during sintering, but fails to control the aluminum powder from the source performance, and the introduction of organic matter increases the cost and increases the technical difficulty of raw material powder preparation and printing

Method used

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  • Aluminum-silicon alloy powder for 3D printing and preparation method thereof
  • Aluminum-silicon alloy powder for 3D printing and preparation method thereof
  • Aluminum-silicon alloy powder for 3D printing and preparation method thereof

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preparation example Construction

[0037] A preparation method for aluminum-silicon alloy powder for 3D printing, comprising the following steps:

[0038] The aluminum-silicon alloy raw material is heated and melted in vacuum within the range of 630°C-700°C and kept for a period of time to make it fully mixed and uniform. The content is 15%wt-30%wt, the content of Fe is not more than 0.3wt%, the content of Cu is not more than 0.15wt%, and the rest is Al;

[0039]Use high-speed compressed airflow (high-purity argon or nitrogen) to impact the molten aluminum-silicon alloy flow, the gas pressure of the high-speed compressed airflow is 1.6-2.5MPa, and adopt a tightly coupled method to ensure that the negative pressure at the outlet is 0.3-0.7kPa. It is broken into aerosolized particles, and the high-speed compressed airflow hits the molten aluminum-silicon alloy flow using a supersonic atomizing nozzle that combines laval and hartmann structures. For the specific structure of the supersonic atomizing nozzle fused ...

Embodiment 1

[0045] According to the mass ratio of 4:1, the aluminum-silicon raw materials were taken respectively, heated and melted in vacuum at 660°C and kept for half an hour, and then the high-speed compressed airflow was used to impact the molten aluminum-silicon alloy flow, and the specific structure of the supersonic atomizing nozzle combined with the laval and hartmann structure could be Refer to the supersonic atomizing nozzle disclosed in Chinese patent CN201410553271.X, which is a fusion of two-stage laval and hartmann structures. The atomizing gas is high-purity argon, and the gas pressure during atomization is 2MPa. The tight coupling method is adopted to ensure negative pressure at the outlet. At 0.5kPa, the primary resonance gas frequency is 100kHz. After the gas is atomized, the powder with a particle size of 10-45 μm is screened out by cyclone classification and collected to obtain aluminum-silicon alloy powder.

[0046] The composition of Al-Si alloy powder was analyzed ...

Embodiment 2

[0055] A preparation method for aluminum-silicon alloy powder for 3D printing, comprising the following steps:

[0056] The aluminum-silicon alloy raw material is heated and melted in a vacuum within the range of 630°C for a period of time, so that it is fully mixed and evenly mixed. The ratio of silicon and aluminum in the aluminum-silicon alloy raw material meets the Si content of the final aluminum-silicon alloy powder used for 3D printing. %wt, Al content is 84.6%wt, Fe content is 0.28wt%, Cu content is 0.12wt%,

[0057] Use high-speed compressed airflow (high-purity argon gas) to impact the molten aluminum-silicon alloy flow. The gas pressure of the high-speed compressed airflow is 1.6MPa. The tight coupling method is adopted to ensure that the negative pressure at the outlet is 0.3kPa, and it is broken into aerosol. The high-speed compressed airflow impinges on the molten aluminum-silicon alloy flow using a supersonic atomizing nozzle that combines laval and hartmann str...

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Abstract

The invention relates to aluminum-silicon alloy powder for 3D printing and a preparation method thereof, and belongs to the technical field of metal powder 3D printing. The preparation method comprises the following steps that firstly, after an aluminum-silicon alloy raw material in vacuum is heated and melted, the aluminum-silicon alloy raw material is fully and uniformly mixed, then an aluminum-silicon alloy flow is impacted and melted by adopting high-speed compressed air flow, the aluminum-silicon alloy flow is crushed to obtain gas-atomized particles, after gas-atomized particles are cooled, the aluminum-silicon alloy powder prepared by a gas atomization technology is obtained, and after gas atomization is carried out, the aluminum-silicon alloy powder is screened to obtain the aluminum-silicon alloy powder for 3D printing in required particle size range. Compared with the prior art, the aluminum-silicon alloy powder is used for selective laser melting (SLM), printed products havebetter mechanical properties, and meanwhile, the powder preparation technology is convenient and fast, the aluminum-silicon alloy powder is low in production cost and capable of achieving mass production.

Description

technical field [0001] The invention belongs to the technical field of metal powder 3D printing, and in particular relates to an aluminum-silicon alloy powder for 3D printing and a preparation method thereof. Background technique [0002] 3D printing is a preparation technology that uses three-dimensional model data to obtain products with complex shapes through layer-by-layer accumulation. Compared with the preparation methods of traditional plastics, ceramics, metals and alloys, and composite materials, 3D printing technology has a series of advantages such as the ability to prepare high-precision and complex-shaped products, save raw materials, and save costs, and has a good application prospect. Currently commonly used 3D printing methods include direct three-dimensional printing technology (3DP), selective laser melting technology (SLM), stereolithography technology (SLA), fused deposition technology (FDM), etc., among which selective laser melting technology (SLM) It ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08B22F1/00C22C21/02B33Y70/00
CPCB22F9/082C22C21/02B33Y70/00B22F2009/0824B22F2009/088B22F2009/0896B22F2009/0848B22F1/065
Inventor 严鹏飞尹春月严彪
Owner TONGJI UNIV
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