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Foamed aluminium and aluminum alloy tackifying foaming preparation method

A technology of aluminum alloy and aluminum foam, which is applied in the field of foaming aluminum foam and aluminum alloy to increase viscosity and foaming, can solve the problem of difficult control of pore structure uniformity and consistency, high cost of tackifier and foaming agent, and difficulty in process parameters. To master other problems, to achieve the effect of simple and effective treatment method, not easy to be distorted, and prolong the stirring time

Inactive Publication Date: 2007-12-05
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The metal melt is completed in two relatively independent processes of viscosification and foaming, but the cost of specially prepared or purchased viscosifiers and foaming agents is relatively high. Untreated titanium hydride begins to decompose at 340 ° C, and 400 ° C The above decomposition is obvious, and the bubbles form rapidly in the aluminum melt (660°C), and rapidly grow up, float or break, and merge, and the pores are extruded and deformed by each other, making it difficult to control the uniformity and consistency of the pore structure.
Therefore, the titanium hydride foaming agent needs to be subjected to physical grinding, heating oxidation, gel wrapping, metal wrapping and other artificial passivation treatments before use. The processing technology requires high requirements, and the process parameters are difficult to master, which further increases the production cost.

Method used

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  • Foamed aluminium and aluminum alloy tackifying foaming preparation method
  • Foamed aluminium and aluminum alloy tackifying foaming preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Heat the aluminum ingot to 670° C., keep it warm until the aluminum ingot is completely melted, add a calcium carbonate thickener with a mass percentage of 1.5%, and stir at a speed of 400 r / min to increase the viscosity to a preset viscosity. In order to make the tackifier fully mixed, determine the stirring time according to the reading of the torque meter, generally 5-10min, and then add calcium carbonate foaming agent powder treated with sodium sulfate, (add 10g sodium sulfate to 100mL water to make an aqueous solution, and then Add 50g of light calcium carbonate powder and stir well, bake it in an oven at 50℃ until fully dry, take it out and crush it, and pass through a 200-mesh sieve) The mass fraction is 1.5%, high-speed stirring is carried out, the speed is controlled at 800~1100r / min, and the stirring is 1.5~ After 3.5 minutes, raise the stirring paddle and keep the temperature in the furnace for 15-90s. In order to prevent the pore structure from collapsing, when ...

Embodiment 2

[0020] The aluminum ingot is heated to 665-700°C, kept until the aluminum ingot is completely melted, and 1.0%-2.0% by mass of calcium carbonate thickener is added, and stirred at a speed of 400r / min to increase the viscosity to a preset viscosity. In order to mix the tackifier thoroughly, determine the stirring time according to the reading of the torque meter, usually 5-10 minutes, and then add calcium carbonate foaming agent powder mixed with a small amount of titanium hydride (100g calcium carbonate powder mixed with 15g titanium hydride powder and stir well Mixing) The mass fraction is 1.0%~2.5%, high-speed stirring, the speed is controlled at 800~1100r / min, the stirring paddle is raised after 1.5~3.5min, the furnace is kept for 15~90s, in order to prevent the pore structure from collapsing and growing When it is close to the target size, it should be quickly taken out of the oven and cooled and solidified using a water cooling system.

Embodiment 3

[0022] The first step: add sodium sulfate or sodium fluoride and other sulfate and fluoride water-soluble salt solutions, which account for 5-15% of the water mass fraction, into a certain volume of water, and stir to fully dissolve;

[0023] The second step: add calcium carbonate powder, which accounts for 30-80% of the mass fraction of the aqueous solution, to the above-mentioned salt solution, stir it thoroughly and put it in an oven for drying, and crush it through a sieve to form a powder for use;

[0024] The third step: Take a certain amount of calcium carbonate powder, add 2-55% of the calcium carbonate mass fraction of titanium hydride powder to it, mix well, and set aside;

[0025] Step 4: Put the pure aluminum or aluminum alloy aluminum ingot into a heat-resistant crucible and heat it to 665-700°C, keep it warm until the aluminum ingot is completely melted, and the temperature of the aluminum liquid is uniform and stable;

[0026] Step 5: Lower the electric stirring pad...

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Abstract

The viscosity increasing and foaming process for preparing foamed aluminum or aluminum alloy includes the following steps: compounding water solution of sulfate or fluoride salt; adding carbonate powder via stirring, stoving and powdering the mixture; mixing carbonate powder and titanium hydride powder; heating aluminum or aluminum alloy to melt; adding carbonate powder or compound foaming agent powder via stirring; maintaining in the furnace; and fast water cooling to solidify after growing to reach the required size. The process can form spherical pores in the foamed aluminum or aluminum alloy.

Description

1. Technical Field [0001] The invention belongs to a method for manufacturing closed-cell porous aluminum foam and aluminum alloy, in particular to a method for preparing foam aluminum and aluminum alloy by thickening and foaming. 2. Background technology [0002] Existing technology: Because of simple equipment and relatively low production cost, the melt foaming method is currently the preferred process for producing closed-cell aluminum foam. The traditional foam aluminum melt foaming method uses tackifiers such as calcium, silicon carbide, aluminum oxide powder, aluminum powder, etc. to increase the viscosity of the molten aluminum, and then adds a special foaming agent such as titanium hydride to foam. The agent is heated to decompose to release gas and generate bubbles in the melt, and the bubbles are uniformly dispersed and distributed in the metal matrix by stirring and other methods. After cooling, the pores are retained in the metal to form a foamed metal preparation me...

Claims

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Application Information

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IPC IPC(8): C22C1/08
Inventor 何思渊魏永生何德坪丁龙顾菲菲甘望益
Owner SOUTHEAST UNIV
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