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A method for preparing aluminum-based foam material by negative pressure foaming

An aluminum-based foam material and negative pressure technology, which is applied in the field of porous metal materials, can solve the problems of effective control of the foam aluminum expansion process, achieve the effect of saving the amount of foaming agent and improving the uniformity

Active Publication Date: 2015-11-04
山东宏钧新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent does not involve how to effectively control the expansion process of foamed aluminum

Method used

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  • A method for preparing aluminum-based foam material by negative pressure foaming
  • A method for preparing aluminum-based foam material by negative pressure foaming

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A method for preparing aluminum-based foam material with a target expansion rate of 315% using negative pressure foaming, the steps are as follows:

[0051] 1. Put 600g of industrial pure aluminum into a cylindrical steel crucible with a diameter of 100mm. Place the crucible in the crucible electric furnace to heat the aluminum. The temperature is kept at 740℃ and the stirring speed is 1200 rpm. Add calcium metal with a mass fraction of 2.5% aluminum to the molten aluminum, and stir for 10 minutes;

[0052] 2. Control the temperature in the furnace at 690℃, add titanium hydride with a mass fraction of aluminum 0.1% at a stirring speed of 1500 rpm, and continue stirring for 6 minutes; after the stirring stops, the expansion rate of the molten aluminum is 113%. Under continued heat preservation, the expansion rate of molten aluminum did not change significantly;

[0053] 3. Transfer the crucible to a stainless steel foaming chamber with a closed cover with a quartz observation ...

Embodiment 2

[0057] A target density of 0.65gcm prepared by negative pressure foaming -3 The method of aluminum-based foam material components, the steps are as follows:

[0058] 1. Put 700g of A356 aluminum alloy into a steel crucible and heat it in an electric furnace to melt the aluminum alloy. The temperature is kept at 740℃ and the stirring speed is 800 rpm. The mass fraction is added to the molten aluminum. Aluminum 3.0% calcium metal, stirring for 5 minutes;

[0059] 2. Control the temperature in the furnace at 710°C, add 0.4% titanium hydride with aluminum mass fraction at a stirring speed of 2000 rpm, and continue stirring for 6 minutes;

[0060] 3. Transfer the crucible to a stainless steel foaming chamber with a closed cover with a quartz observation window, use a laser rangefinder to measure the height of the melt through the quartz window, and start the air extraction device, while monitoring the pressure in the foaming chamber And the height of the foam, the pressure control range ...

Embodiment 3

[0065] A method for preparing aluminum-based foam material with a target expansion rate of 321% by using negative pressure foaming, the steps are as follows:

[0066] 1. Put 600g of industrial pure aluminum into a steel crucible, put the crucible in the crucible electric furnace to heat the aluminum, and keep the temperature at 730℃; under the condition of a stirring speed of 1000 rpm, add it to the molten aluminum. Add 1.2g of metallic magnesium as alloy component and copper-plated short carbon fiber with a volume fraction of aluminum 0.5%, and continue to stir for 4 minutes;

[0067] 2. Control the temperature in the furnace at 700℃, add calcium carbonate with a mass fraction of aluminum 0.1% at a stirring speed of 1700 rpm, and continue stirring for 8 minutes; after the stirring stops, the expansion rate of the molten aluminum is 110%. Under continued heat preservation, the expansion rate of molten aluminum did not change significantly;

[0068] 3. Transfer the crucible to a stai...

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Abstract

All performances especially the function characteristics of an aluminum base foam material are closely related with its density and pore structure. The invention provides a method for preparing the aluminum base foam material by utilizing negative pressure foaming. The method comprises the following steps: heating industrially pure aluminum or aluminum alloy for melting to form molten aluminum, adding a tackifier to the molten aluminum, and adding a foaming agent to the molten aluminum to form molten aluminum containing small pores; putting the molten aluminum containing small pores in a closed foaming cavity, and carrying out air exhaust to reduce the pressure in the foaming cavity and expand the molten aluminum with the reduction of the pressure in the cavity in order to form foams; and cooling the foams with the cavity while maintaining the pressure in the foaming cavity constant to obtain the aluminum base foam material. Foam materials with designed profile, weight and density can be prepared through one-time molding by using the method. The active controllability of the foam aluminum foaming process is realized to obtain the foam aluminum material having a specific amount of porosity, so the uniformity of the pore structure is improved; and direct foaming molding is realized, so the consumption of the foaming agent is saved.

Description

Technical field [0001] The invention belongs to the technical field of porous metal materials, and specifically relates to a preparation method of an aluminum-based foam material. Background technique [0002] Aluminum-based foam material (also known as foamed aluminum) is a porous metal material based on pure aluminum or aluminum alloy. It combines many characteristics of porous materials and metal materials, such as low density, high specific strength, and noise reduction , Energy absorption and electromagnetic shielding performance, can be widely used in machinery manufacturing, transportation, aerospace and national defense security and other fields. The various properties of foamed aluminum, especially the functional characteristics, are closely related to its density and pore structure. Therefore, the use of new technologies to improve the controllability of the foaming process is a necessary condition for the preparation of high-performance aluminum foams with stable qual...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/08C22C21/00
Inventor 曹卓坤罗洪杰薛琦卢百意孙建秋
Owner 山东宏钧新材料技术有限公司
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