Preparation method of aluminum alloy semi solid-state slurry

A technology of semi-solid slurry and aluminum alloy, applied in the field of preparation of aluminum alloy semi-solid slurry, can solve the problems of powder backlog and waste, and achieve the effect of increasing the degree of supercooling, avoiding waste and improving rheological properties.

Inactive Publication Date: 2007-12-05
临沂高新城乡发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Except for some special purposes, these powders cannot be remelted for reuse. With the continuous increase of injection molding production, these powders will cause backlog or waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1 (preparation of 6061 aluminum alloy semi-solid slurry)

[0018] The composition of the 6061 aluminum alloy in this embodiment is 1.0Mg-0.65Si-0.35Cu-0.20Cr, and the balance is Al.

[0019] ① After melting 20kg of 6061 aluminum alloy, use high-pressure inert gas to atomize it into fine droplets, collect them after solidification, and pass through a 200-mesh sieve to obtain aluminum alloy atomized powder with an average particle size of 60 μm;

[0020] ② Heat 20kg of 6061 aluminum alloy to 720°C to melt into a metal melt. After refining, the metal melt is cooled to a temperature below the liquidus line of 650°C, and kept at this temperature;

[0021] ③ During the heat preservation process, take 2 kg of the aluminum alloy atomized powder obtained in step ① and add it to the metal melt, and stir for 2 minutes to obtain an aluminum alloy semi-solid slurry with a uniform, fine, and equiaxed non-dendritic structure.

Embodiment 2

[0022] Embodiment 2 (preparation of A356 aluminum alloy semi-solid slurry)

[0023] The composition of the A356 aluminum alloy in this embodiment is 6.8Si-0.3Mg-0.2Cu-0.1Mn-0.2Ti, and the balance is Al.

[0024] ① Collect the aluminum alloy overspray powder suspended in the atomization chamber during the spray forming process of A356 aluminum alloy, and pass through a 200 mesh sieve to obtain the aluminum alloy overspray powder with an average particle size of 40 μm;

[0025] ②Heat 20kg of A356 aluminum alloy at 700°C to melt it into a metal melt. After refining, the metal melt is cooled to a temperature below the liquidus line of 590°C, and kept at this temperature;

[0026] ③ During the heat preservation process, take 4kg of the aluminum alloy overspray powder obtained in step ① and add it to the metal melt, and stir for 5 minutes to obtain an aluminum alloy semi-solid slurry with a uniform, fine, and equiaxed non-dendritic structure.

Embodiment 3

[0027] Embodiment 3 (preparation of 7075 aluminum alloy semi-solid slurry)

[0028] The composition of the 7075 aluminum alloy in this embodiment is 5.6Zn-2.8Mg-1.7Cu-0.4Si-0.2Cr, and the balance is Al.

[0029] ① After melting 20kg of 7075 aluminum alloy, use high-pressure inert gas to atomize it into fine droplets, collect them after solidification, and pass through a 200-mesh sieve to obtain aluminum alloy atomized powder with an average particle size of 50 μm;

[0030] ② Heat 20kg of 7075 aluminum alloy at 750°C to melt it into a metal melt. After refining, the metal melt is cooled to a temperature below the liquidus line of 550°C, and kept at this temperature;

[0031] ③ During the heat preservation process, take 10 kg of the aluminum alloy atomized powder obtained in step ① and add it to the metal melt, and stir for 10 minutes to obtain an aluminum alloy semi-solid slurry with a uniform, fine, and equiaxed non-dendritic structure.

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Abstract

The present invention discloses process of preparing semi-solid aluminum alloy slurry. The process includes the following steps: 1. preparing aluminum alloy powder through high pressure inert gas atomizing or jet molding; 2. heating partial aluminum alloy into melt and maintaining in semi-solidifying temperature region; and 3. mixing the aluminum alloy powder and the aluminum alloy melt through stirring to obtain semi-solid aluminum alloy slurry. The process of the present invention can produce semi-solid aluminum alloy slurry with fine structure in short period, simple apparatus and low cost.

Description

technical field [0001] The invention belongs to the field of semi-solid metal processing, and in particular relates to a method for preparing aluminum alloy semi-solid slurry. Background technique [0002] Semi-solid metal processing technology has many excellent characteristics and has been developed rapidly in recent years. The use of semi-solid processing methods can produce parts with complex shapes, such as brake cylinders and aluminum alloy wheels for automobiles, air-conditioning equipment parts, steering and transmission system parts, pistons, connecting parts of electronic devices used in aerospace, etc. [0003] Semi-solid metal processing requires that the slurry used for forming has a uniform, fine, equiaxed non-dendritic structure, and the slurry is obtained through the pulping process. Therefore, obtaining an ideal structure (ie slurry) with semi-solid metal forming through the pulping process is the basis and key of semi-solid metal forming technology, and it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/00B22F9/08C22C21/00
Inventor 李小平于赟雷卫宁
Owner 临沂高新城乡发展有限公司
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