Foamed aluminium and aluminum alloy tackifying foaming preparation method

A foamed aluminum alloy and foamed aluminum technology are applied in the field of foaming and foaming preparation of foamed aluminum and aluminum alloy. For high-level problems, the treatment method is simple and effective, not easy to be distorted, and the effect of prolonging the stirring time

Inactive Publication Date: 2008-12-03
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
  • Foamed aluminium and aluminum alloy tackifying foaming preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Heat the aluminum ingot to 670°C, keep warm until the aluminum ingot is completely melted, add 1.5% calcium carbonate thickener, stir at 400r / min, and increase the viscosity to the preset viscosity. In order to fully mix the tackifier, determine the stirring time according to the reading of the torque meter, generally 5 to 10 minutes, then add calcium carbonate foaming agent powder treated with sodium sulfate, (10g sodium sulfate is added to 100mL water to prepare an aqueous solution, and then Add 50g of light calcium carbonate powder and stir thoroughly, bake in an oven at 50°C until fully dry, take it out and grind it, pass through a 200 mesh sieve) with a mass fraction of 1.5%, stir at a high speed, control the speed at 800-1100r / min, and stir for 1.5- After 3.5 minutes, raise the stirring paddle and keep warm in the furnace for 15-90 seconds. In order to prevent the pore structure from collapsing, when it grows close to the target size, it should be quickly released ...

Embodiment 2

[0020] Heat the aluminum ingot to 665-700°C, keep warm until the aluminum ingot is completely melted, add calcium carbonate thickener with a mass percentage of 1.0%-2.0%, stir at a speed of 400r / min, and increase the viscosity to the preset viscosity. In order to fully mix the tackifier, determine the stirring time according to the reading of the torque meter, generally 5 to 10 minutes, 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) with a mass fraction of 1.0% to 2.5%, high-speed stirring, the speed controlled at 800 to 1100r / min, stirring for 1.5 to 3.5 minutes, raising the stirring paddle, and keeping the temperature in the furnace for 15 to 90s, in order to prevent the pore structure from collapsing and growing When it is close to the target size, it should be quickly released from the furnace and cooled and solidified by a water cooling...

Embodiment 3

[0022] Step 1: Add sodium sulfate or sodium fluoride and other sulfate and fluoride soluble salt solutions in a certain volume of water, accounting for 5% to 15% of the water mass fraction, and stir to fully dissolve;

[0023] The second step: adding calcium carbonate powder accounting for 30-80% of the aqueous solution mass fraction to the above salt solution, fully stirring, putting it into an oven for drying, and crushing and sieving to form a powder, and set aside;

[0024] Step 3: Take a certain amount of calcium carbonate powder, add titanium hydride powder accounting for 2-55% of the calcium carbonate mass fraction, mix evenly, and set aside;

[0025] Step 4: Put the pure aluminum or aluminum alloy aluminum ingot into the 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 molten aluminum is uniform and stable;

[0026] Step 5: Lower into the electric stirring paddle that can control th...

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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 foamed aluminum and aluminum alloy by increasing viscosity and foaming. 2. Background technology [0002] Existing technology: The melt foaming method is the preferred process for producing closed-cell foamed aluminum materials due to its simple equipment and relatively low production cost. The traditional foaming aluminum melt preparation process uses thickening agents such as calcium, silicon carbide, alumina powder, aluminum powder, etc. to increase the viscosity of molten aluminum, and then adds special foaming agents such as titanium hydride to foam. The agent is heated to decompose to release gas and generate bubbles in the melt. The bubbles are evenly dispersed in the metal matrix by stirring and other methods. After cooling, the pores stay in the metal to form a foam metal preparation method. The m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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