Method for preparing aluminum base foam material by utilizing 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 expansion process of foamed aluminum, and achieve the effect of saving the amount of foaming agent and improving the uniformity.

Inactive Publication Date: 2014-05-28
北京宏钧新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Method for preparing aluminum base foam material by utilizing negative pressure foaming
  • Method for preparing aluminum base foam material by utilizing negative pressure foaming

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Embodiment 1

[0050] A method for preparing an aluminum-based foam material with a target expansion rate of 315% by 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 an electric crucible furnace and heat it to melt the aluminum. Add calcium metal with a mass fraction of 2.5% aluminum in the molten aluminum, and stir for 10 minutes;

[0052] 2. Control the temperature in the furnace at 690°C, add titanium hydride with a mass fraction of 0.1% aluminum at a stirring speed of 1500 rpm, and continue stirring for 6 minutes; after the stirring is stopped, the expansion rate of the aluminum liquid is 113%. Under the continuous heat preservation, the expansion rate of aluminum liquid has no obvious change;

[0053] 3. Transfer the crucible to a stainless steel foaming chamber with a closed lid with a quartz observation window, use a laser rangefinder to measure the h...

Embodiment 2

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

[0058] 1. Put A356 aluminum alloy with a mass of 700g into a steel crucible and heat it in an electric furnace to melt the aluminum alloy. At a constant temperature of 740°C and a stirring speed of 800 rpm, add a mass fraction of Aluminum 3.0% calcium metal, stir for 5 minutes;

[0059] 2. Control the temperature in the furnace at 710°C, add 0.4% titanium hydride with a mass fraction of aluminum 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 lid with a quartz observation window, use a laser rangefinder to measure the height of the melt through the quartz window, start the pumping device, and monitor the pressure in the foaming chamber at the same time and the height of the foam body, the pressure control...

Embodiment 3

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

[0066] 1. Put 600g of industrial pure aluminum into a steel crucible, place the crucible in an electric crucible furnace to heat the aluminum to melt, and keep the constant temperature at 730°C; under the condition of a stirring speed of 1000 rpm, pour it into the molten aluminum successively Add 1.2g metal magnesium as the alloy composition and the copper-plated short carbon fiber whose volume fraction is 0.5% of aluminum, and continue to stir for 4 minutes;

[0067] 2. Control the temperature in the furnace at 700°C, add calcium carbonate with a mass fraction of 0.1% aluminum at a stirring speed of 1700 rpm, and continue stirring for 8 minutes; after the stirring stops, the expansion rate of the aluminum liquid is 110%. Under the continuous heat preservation, the expansion rate of aluminum liquid has no obvious change; ...

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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 in particular relates to a preparation method of an aluminum-based foam material. Background technique [0002] Aluminum-based foam material (also known as aluminum foam) is a porous metal material based on pure aluminum or aluminum alloy, which combines the characteristics of porous materials and metal materials, such as low density, high specific strength, and noise reduction. , energy absorption and electromagnetic shielding properties, can be widely used in machinery manufacturing, transportation, aerospace and national defense security and other fields. The properties of aluminum foam, 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 quality....

Claims

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Application Information

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IPC IPC(8): C22C1/08C22C21/00
Inventor 曹卓坤罗洪杰薛琦卢百意孙建秋
Owner 北京宏钧新材料技术有限公司
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