Aluminum powder mixing method

An aluminum powder and mixing technology, which is applied in the field of aluminum powder mixing, can solve the problem of large fluctuation of the particle size of aluminum powder, and achieve the effect of uniform particle size distribution, good stability, and avoiding bimodal distribution.

Active Publication Date: 2020-05-12
深圳立专信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, most of the aluminum powder production adopts conical mixing equipment with a mixing volume of 1-2 tons. When mixing and producing a single batch of aluminum powder exceeding 10 tons, it can only be carried out in a small batch of 1-2 tons. Mixed production, large particle size fluctuations between small batches of aluminum powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for mixing aluminum powder, which specifically requires obtaining aluminum powder with a specification of 23-25um, the details are as follows:

[0025] The first step is to obtain raw materials, select skeleton aluminum powder and graded aluminum powder as raw materials, wherein: the skeleton aluminum powder is aluminum powder with a median diameter of D50 and 28-30um, and the graded aluminum powder adopts a median diameter of D50 and 8- Combination of 9um aluminum powder and 3-4um aluminum powder, wherein: the concentration factor of the skeleton aluminum powder is 1.3; the concentration factor of the 8-9um aluminum powder is 1.2, and the concentration factor of the 3-4um aluminum powder is 1.3;

[0026] In terms of weight percentage, 28-30um aluminum powder: 8-9um aluminum powder: 3-4um aluminum powder is 75:20:5.

[0027] The second step, premixing, specifically: including 10 times of premixing; the premixing process is specifically to stir the raw materials...

Embodiment 2-3

[0030] Embodiment 2-3 differs from Embodiment 1 in that:

Embodiment 2

[0031] Example 2: 28-30um aluminum powder in weight percentage: 8-9um aluminum powder: 3-4um aluminum powder is 60:30:10; including 5 premixes, the raw material for a single premix is 2 tons, the total amount of 10 premixes is 20 tons. The target product obtained in Example 3 is aluminum powder of D50 and 24-24.5um, the concentration coefficient is 1.8, and the tap density reaches 1.62g / cm 3 , particle size fluctuation between batches is less than 0.65%

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Abstract

The invention provides an aluminum powder mixing method. The aluminum powder mixing method comprises the following steps of first, obtaining raw materials: selecting skeleton aluminum powder and graded aluminum powder as the raw materials; second, premixing: uniformly stirring the raw materials containing the skeleton aluminum and the graded aluminum powder in the first step in a conical mixer toobtain pre-mixed aluminum powder; and third, mixing: uniformly stirring a certain amount of aluminum powder taken out from the pre-mixed aluminum powder obtained in the second step to obtain the target product. A variety of aluminum powders with the same specifications are taken as the raw materials, the appropriate ratio is selected according to different needs, and mixing is performed accordingto a specific mixing process (the combination of obtaining raw materials, premixing, and mixing, and even remixing), and after multiple cross-mixing treatments, graded aluminum powder particles can befully and evenly distributed between skeleton aluminum powder particles to achieve full filling, so that the particle size fluctuations of the final aluminum powder product batches do not exceed eight per thousand, and the tap density is as high as 1.65g / cm<3>.

Description

technical field [0001] The invention relates to the technical field of metal powder processing, in particular to an aluminum powder mixing method with good uniformity and high tap density. Background technique [0002] Micro-spherical aluminum powder is made by atomizing aluminum droplets or liquid strips into particles through inert high-pressure gas in the molten state. The appearance is silver-gray, and the particles are more regular spherical or nearly spherical. Due to its regular shape, smooth surface, high active aluminum content, and stable product quality, fine spherical aluminum powder is widely used in aerospace solid propellant fuel, photovoltaic solar crystalline silicon battery slurry, high-grade metallic pigments, thermal and conductive materials, fire-resistant Materials and powder metallurgy and other fields occupy an important position in national economic construction and national defense industry construction. [0003] At present, the focus of fierce com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00
CPCB22F1/052
Inventor 刘颖俊
Owner 深圳立专信息科技有限公司
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