Method for preparing aluminum powder and aluminum alloy powder through water atomization

A technology of aluminum alloy powder and water atomization, applied in the field of powder metallurgy, can solve the problems of high gas atomization cost, affect the activity of aluminum powder, low cooling rate, etc., to improve the supersaturated solid solubility, reduce the generation of hydrogen, The effect of ensuring production safety

Active Publication Date: 2014-12-24
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of using gas atomization to prepare aluminum powder are: 1. The cooling rate is low, and the cooling rate of general gas atomization is 10 2 -10 3 K/s; Second, it is difficult to prepare ultrafine powder by gas atomization. The particle size of aluminum powder prepared by gas atomization is generally coarse, and it is difficult to prepare ultrafine aluminum powder below 5 μm; Third, the cost of gas atomization is relatively high
The water atomization technolog

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Preparation of ultrafine pure aluminum powder by water atomization

[0017] 1) Add high-purity aluminum ingots into the diversion crucible, and make the melted volume not exceed two-thirds of the crucible volume.

[0018] 2) Turn on the heating system to heat and melt the aluminum ingot, keep the temperature of the melt at 800°C, and keep it warm for 30 minutes. Simultaneously heat the induction crucible.

[0019] 3) Pour molten pure aluminum liquid into the diversion crucible so that it flows out continuously along the diversion tube at the bottom of the diversion crucible.

[0020] 4) Turn on the high-pressure water pump, control the pressure of the high-pressure water flow to be 5MPa, make the high-pressure water flow with pH 4.0 added with the inhibitor spray out along the nozzle on the top of the atomization chamber, atomize the aluminum liquid and obtain ultra-fine aluminum powder.

[0021] 5) Perform centrifugal drying and vacuum drying on the obtain...

Embodiment 2

[0022] Example 2: Preparation of 2024 aluminum alloy powder by water atomization

[0023] 1) Add pure aluminum ingots to the diversion crucible, and add copper and magnesium according to the mass fractions of Cu and Mg being 4.8% and 1.8% respectively, and make the volume after melting not exceed two-thirds of the crucible volume .

[0024] 2) Turn on the heating system to heat and melt the aluminum ingot, so that the temperature of the melt is kept at 900° C. and kept warm for 40 minutes. Simultaneously heat the induction crucible.

[0025] 3) Pour the molten aluminum alloy into the diversion crucible so that it flows out continuously along the diversion tube at the bottom of the diversion crucible.

[0026] 4) Turn on the high-pressure water pump, control the pressure of the high-pressure water flow to 10MPa, and spray the high-pressure water flow with a pH of 4.5 added with inhibitors along the nozzle on the top of the atomization chamber to atomize the aluminum alloy liq...

Embodiment 3

[0028] Example 3: Preparation of heat-resistant aluminum alloy powder by water atomization

[0029] 1) Add pure aluminum ingots to the diversion crucible, and add copper and magnesium according to the mass fractions of Cu and Mg being 4.8% and 1.8% respectively, and make the volume after melting not exceed two-thirds of the crucible volume .

[0030] 2) Turn on the heating system to heat and melt the aluminum ingot so that the temperature of the melt is kept at 1100° C. and kept for 60 minutes. Simultaneously heat the induction crucible.

[0031] 3) Pour the molten aluminum alloy into the diversion crucible so that it flows out continuously along the diversion tube at the bottom of the diversion crucible.

[0032] 4) Turn on the high-pressure water pump, control the pressure of the high-pressure water flow to 16 MPa, and spray the high-pressure water flow with a pH of 5.0 added with inhibitors along the nozzle on the top of the atomization chamber to atomize the aluminum all...

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PUM

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Abstract

The invention discloses a method for preparing aluminum powder and aluminum alloy powder through water atomization. The method comprises the following steps of melting aluminum ingots or aluminum alloy by using a guide crucible, and ensuring that the temperature of a melt is kept between 700DEG C and 1,100DEG C for 30 to 60 minutes; meanwhile, heating the guide crucible; pouring molten aluminum alloy into the guide crucible, and allowing the molten aluminum alloy to continuously flow out along a guide tube at the bottom of the guide crucible; starting a high pressure water pump, controlling the pressure of high pressure current to be 2-16MPa and the water temperature to be 10-40DEG C, enabling the high pressure current into which an inhibitor is added and of which the pH is 4.0-5.0 to be sprayed by nozzles on the top of an atomizing chamber, and atomizing the molten aluminum to obtain the aluminum and aluminum alloy powder. According to the method, the aluminum powder can be safely produced through the water atomization; compared with aluminum powder prepared through gas atomization, the aluminum powder prepared through the water atomization is finer in particle size, large in specific surface area and high in activity; moreover, the water atomization is higher in cooling speed, the extended solid solubility of alloy elements is greatly improved, and aluminum alloy which is hardly prepared by a casting process is produced. In addition, the cost of preparing the aluminum powder through the water atomization is lower than the cost of preparing the aluminum powder through the gas atomization, and the method is suitable for large-scale production.

Description

technical field [0001] The invention relates to the field of powder metallurgy, and relates to a method for preparing aluminum powder and aluminum alloy powder by water atomization. Background technique [0002] Aluminum powder is an important industrial raw material, widely used in metal flash coatings, solid rocket propulsion, conductive coatings and powder metallurgy industries. At present, when domestic and foreign manufacturers produce aluminum powder, they all use gas atomization to produce, and the gas used is generally inert gas such as nitrogen and argon for atomization. The main disadvantages of using gas atomization to prepare aluminum powder are: 1. The cooling rate is low, and the cooling rate of general gas atomization is 10 2 -10 3 K / s; Second, it is difficult to prepare ultrafine powder by gas atomization. The particle size of aluminum powder prepared by gas atomization is generally coarse, and it is difficult to prepare ultrafine aluminum powder below 5 μm...

Claims

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Application Information

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IPC IPC(8): B22F9/08
Inventor 郭志猛曹慧钦罗骥杨薇薇叶安平
Owner UNIV OF SCI & TECH BEIJING
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