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Ultrafine aluminum alloy powder and production method thereof

A technology of aluminum alloy powder and production method, which is applied in the field of powder metallurgy and can solve problems such as large-scale preparation that has not been seen

Inactive Publication Date: 2016-10-12
泸溪县安泰新材料科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] There are literature reports on the preparation of aluminum alloy powder by gas atomization method, but there is no large-scale preparation of ultra-fine (below 20 μm) process

Method used

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  • Ultrafine aluminum alloy powder and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Add 92.05-94.35 kg of metal aluminum ingot with a purity of 99.85% into a non-polluting crucible and heat it to 700°C, then add 3.8-4.9 kg of metal copper with a purity of more than 99%, 0.3-0.9 kg of manganese, and 1.2-4 kg of magnesium. Add 1.8kg, 0.1kg of chromium, and 0.25kg of zinc (the total mass of aluminum and other alloy elements is 100.00kg) into the molten aluminum, heat up to above 950°C, and transfer to the holding furnace for standby. Vacuum the atomization system, and when the pressure in the system is reduced to 40Pa, feed high-purity nitrogen >99.99% to ensure that the oxygen content in the system is below 100ppm. At the same time, use the compressor to pressurize the high-purity nitrogen gas (purity above 99.99%) to 9MPa, heat the high-purity nitrogen gas (purity above 99.99%) to 700°C through the heating tube, and pass the alloy liquid in the insulation bag through the atomizer Into the airtight atomization system that is sprayed into, unde...

Embodiment 2

[0040] Example 2: Add 97.0 to 97.5 kg of aluminum ingot with a purity of 99.85% into a non-polluting crucible and heat it to 700°C, then add 0.6 kg of silicon metal with a purity of more than 99%, 0.7 kg of iron, 0.1 kg of copper, and 0.9 to 0.9 kg of manganese. 1.5kg and 0.1kg of zinc (the total mass of aluminum and other alloy elements is 100.00kg) are added to the molten aluminum, the temperature is raised to above 920°C, and transferred to the holding furnace for standby. Vacuum the atomization system, and when the pressure in the system drops to 40Pa, feed high-purity nitrogen (purity>99.99%) to ensure that the oxygen content in the system is below 100ppm. At the same time, use the compressor to pressurize the high-purity nitrogen gas (purity above 99.99%) to 7MPa, heat the high-purity nitrogen gas (purity above 99.99%) to 600°C through the heating tube, and atomize the aluminum alloy liquid in the insulation bag In the closed atomization system injected by the sprayer, t...

Embodiment 3

[0042] Put 95.9~96.7kg of metal aluminum ingot with a purity of 99.85% into a pollution-free crucible and heat it to 700°C, then add 0.25kg of metal silicon with a purity of more than 99%, 0.4kg of iron, 0.1kg of copper, 0.1kg of manganese, and 2.2~ Add 2.8kg of zinc, 0.1kg of chromium, and 0.15kg of chromium (the total mass of aluminum and other alloying elements is 100.00kg) into molten aluminum, raise the temperature to above 950°C, and transfer to the holding furnace for standby. Vacuum the atomization system, and when the pressure in the system drops below 40Pa, feed high-purity nitrogen (purity>99.99%) to ensure that the oxygen content in the system is below 100ppm. At the same time, use the compressor to pressurize the high-purity nitrogen gas (purity above 99.99%) to 10MPa, heat the high-purity nitrogen gas (purity above 99.99%) to 500°C through the heating tube, and atomize the aluminum alloy liquid in the insulation bag In the closed atomization system injected by th...

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Abstract

The invention discloses ultrafine aluminum alloy powder and a production method thereof, and relates to low-oxygen-content and ultrafine aluminum alloy powder and a production method thereof. The method comprises the following steps: melting high-purity aluminum which serves as a raw material and has the purity being 99.85 percent or above and other high-purity alloy elementary substances which serve as raw materials at high temperature to obtain aluminum alloy liquid, and jetting the alloy liquid into an atomization and settlement chamber protected by high-purity nitrogen (the purity is higher than 99.99 percent) through a spraying head under the conditions of high temperature of 450 to 700 DEG C, high-purity nitrogen (the purity is higher than 99.99 percent), the jetting pressure of 6 to 15 MPa and the gas / metal mass flow rate ratio of 6 to 15: 1, wherein the aluminum alloy liquid is quickly cooled by high-speed circulating flowing of the high-purity nitrogen in a system, and then spherical aluminum alloy powder with the particle size of 1 to 20 microns is collected. The oxygen content of the aluminum alloy powder is less than 0.2 percent, so that when the aluminum alloy powder is used as a material for metal powder injection molding, a product with a uniform microstructure, high density and good performance can be obtained.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a preparation method of ultra-fine aluminum alloy powder with very low oxygen content. It can accurately manufacture small and complex structural parts with good performance. Background technique [0002] Metal injection molding (Metal Injection Molding, MIM) is a new metal parts preparation technology, which is a new part processing technology formed by introducing plastic injection molding technology into the field of powder metallurgy. The basic process steps of MIM are: first select the metal powder and binder that meet the requirements of MIM, and then use an appropriate method to mix the powder and binder into a uniform feed at a certain temperature, and then injection molding after granulation to obtain a formed The billet is sintered and densified after degreasing to become the final product. [0003] Compared with the traditional powder metallurgy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08B22F1/00B22F3/22
CPCB22F1/0003B22F3/225B22F9/082B22F2009/0824B22F2009/0832B22F2009/0844B22F2999/00B22F2201/02
Inventor 董仁安张伟陈上吴显明刘志雄
Owner 泸溪县安泰新材料科技有限责任公司
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