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Production method of superfine spherical aluminium powder

A technology of spherical aluminum powder and production method, which is applied in the production field of fine spherical aluminum powder, can solve the problems of waste of high-purity aluminum powder, wide particle size distribution, poor dispersibility, etc., and achieves high production efficiency, narrow particle size distribution and dispersibility. Good results

Active Publication Date: 2013-02-06
JIANGSU BOQIAN NEW MATERIALS
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Problems solved by technology

The aluminum powder produced by the nitrogen atomization method is spherical, with relatively high purity and a wide particle size distribution, about 1-100 microns, with poor dispersion and low activity. The proportion of fine aluminum powder suitable for silicon solar cell back paste is very small , more than half of them cannot be used, and can only be used in the fireworks and firecracker industry. It is a waste for such high-purity aluminum powder

Method used

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  • Production method of superfine spherical aluminium powder

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Effect test

Embodiment 1

[0020] Put the aluminum powder with a particle size of 100 microns into a planetary ball mill, and ball mill it for 3 hours under a nitrogen atmosphere to obtain a fine flake-shaped aluminum powder with a thickness of about 0.5 microns and a diameter of about 4 microns. Put the aluminum flakes into the powder feeder, Replace the air in the plasma spraying system with argon to make the system in an oxygen-free state, start the plasma spraying system, adjust the power of the plasma spraying gun in the plasma spraying system to 60KW, and start the powder feeding after the plasma arc of the plasma spraying gun is stable The powder feeding rate is 25Kg / h. The fine flake aluminum powder enters the plasma torch through a pipe connecting the powder feeder and the plasma torch under the conveyance of argon, and passes through the plasma arc. The gas that generates the plasma is Argon and hydrogen; the thin flakes of aluminum powder are heated and melted into small droplets when they pas...

Embodiment 2

[0022] Put 50-micron aluminum powder into a planetary ball mill and ball mill for 2.5 hours under a nitrogen atmosphere to obtain a fine flaky aluminum powder with a thickness of about 0.2 microns and a diameter of about 3.5 microns. Put the aluminum flakes into a powder feeder and spray the plasma Replace the gas in the system to make the system in an oxygen-free state, start the plasma spraying system, adjust the power of the plasma spray gun to 60KW, and after the plasma arc of the plasma spray gun is stable, start the powder feeder, and the rate of the powder feeder is 30Kg / h, follow-up procedure is the same as embodiment 1. The produced aluminum powder is a spherical powder with an average particle size of 2.2 microns.

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Abstract

The invention discloses a production method of superfine spherical aluminium powder, which comprises the steps of ball-milling coarse aluminium powder in a ball mill under the shielding of nitrogen, crushing the coarse aluminium powder to fine flake aluminum powder, placing the flake aluminum powder into a powder feeder, replacing gas in a plasma spraying system with inert gas to form an oxygen-free atmosphere, then starting the plasma spraying system, adjusting the power of a plasma spray gun to reach a setting value, starting the powder feeder, allowing the aluminium powder to pass through a plasma arc of the plasma spray gun under gas delivery, allowing the fine flake aluminum powder heated by the plasma arc of the plasma spray gun to be melt into small liquid drops, and rapidly cooling the small liquid drops to the superfine spherical aluminium powder in a cooling kettle. The production method has the advantages that the produced aluminium powder is spherical, good in dispersity, high in activity, uniform in size distribution and narrow in particle size distribution, is 1-5 micrometers in particle size, and can be completely applied to aluminium paste for back surface fields of silicon solar cells, raw materials are used fully, the production efficiency is high, and the materials are not wasted.

Description

technical field [0001] The invention relates to a production method of fine (particle size between 1-5 microns) spherical aluminum powder. Background technique: [0002] Spherical aluminum powder can be used as chemical raw material, solid rocket propellant, electronic paste, etc., especially the high-purity micro-spherical aluminum powder is the main raw material for back paste of silicon solar cells, and is widely used at home and abroad. [0003] At present, the industrial method of producing fine spherical aluminum powder is mainly nitrogen atomization method. The nitrogen atomization method is divided into many types, mainly high-pressure nitrogen atomization method and supersonic nitrogen atomization method. The aluminum powder produced by the nitrogen atomization method is spherical, with relatively high purity and a wide particle size distribution, about 1-100 microns, with poor dispersion and low activity. The proportion of fine aluminum powder suitable for silicon...

Claims

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Application Information

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IPC IPC(8): B22F9/08
Inventor 高书娟毛国平王海勇侯光强王利平
Owner JIANGSU BOQIAN NEW MATERIALS
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