Technology for preparing small-aperture aluminum foam without viscous melt foaming method

A technology of melt foaming and aluminum foam, which is applied in the field of preparation of porous metal materials, can solve the problems of high pyrolysis speed of titanium hydride, increase of foam aluminum preparation cost, easy floating, breaking or merging, etc., to promote production and The effect of spreading, increasing viscosity, and reducing production cost

Active Publication Date: 2014-04-30
HOHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, titanium hydride is mostly used as a foaming agent when preparing foamed aluminum by melt foaming method, but titanium hydride is relatively expensive, and titanium hydride decomposes quickly at high temperature, bubbles form rapidly, and it is easy to float, break or merge, and the formed pores are thick
Therefore, in order to allow the gas to remain in the melt stably, ceramic particles are often added to the melt to increase the viscosity. time

Method used

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  • Technology for preparing small-aperture aluminum foam without viscous melt foaming method
  • Technology for preparing small-aperture aluminum foam without viscous melt foaming method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0019] Embodiment 1: Industrial pure aluminum is heated to 700°C in a stainless steel crucible o C is melted, and the oxide film on the surface of the melt is removed after holding for 10 minutes; then CaCO is added to the aluminum melt 3 The metal magnesium block with 2 times the molar weight was stirred for 5 minutes at a speed of 400rpm after 10 minutes; the temperature of the melt was raised to 710 o C, then add calcium carbonate with a mass of 1.8% of the matrix into the melt and stir at a speed of 1000rpm for 35 seconds, heat and foam for 60s, take out the crucible and water-cool it, and obtain aluminum foam with an average pore diameter of 2.0mm, a porosity of 80%, and a uniform pore structure .

Embodiment approach 2

[0020] Embodiment 2: Heating industrial pure aluminum to 700°C in a stainless steel crucible o C is melted, and the oxide film on the surface of the melt is removed after holding the heat for 10 minutes; adjust the temperature to 680 o C, then add CaCO to the aluminum melt 3 The metal magnesium block with 2 times the molar weight was stirred for 5 minutes at a speed of 400rpm after 10 minutes; the melt temperature was adjusted to 670 o C, then add calcium carbonate with a mass of 1.5% of the matrix to the melt and stir at a speed of 1000rpm for 50 seconds, heat and foam for 30s, take out the crucible and water-cool it, and obtain an aluminum foam with an average pore diameter of 1.0mm, a porosity of 60%, and a uniform pore structure .

Embodiment approach 3

[0021] Embodiment 3: Heating industrial pure aluminum to 700°C in a stainless steel crucible o C melting, heat preservation 10min, remove the oxide film on the surface of the melt; adjust the temperature to 690 o C, the CaCO 3 A pure magnesium block with 3 times the molar weight is added to the melt, and after 10 minutes, it is stirred at a speed of 400rpm for 5 minutes; the temperature of the melt is raised to 700 o C, then add calcium carbonate with a mass of 1.5% of the matrix to the melt and stir at a speed of 1000rpm for 40 seconds, heat and foam for 90 seconds, take out the crucible for water cooling, and obtain a foam with an average pore diameter of 1.5mm, a porosity of 70%, and a uniform pore structure aluminum.

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Abstract

The invention discloses a technology for preparing small-aperture aluminum foam without a viscous melt foaming method and belongs to the field of preparation of a porous metal material. The technology comprises the following steps: by taking calcium carbonate as a foaming agent, adding a pure magnesium block to melt, foaming the melt by a gas formed by reaction of Mg, Al and CaCO3. The viscosity of the melt can be improved by the oxide generated by reaction. The outgassing reaction is slow and stable, so that the problem of a thick aluminum foam structure is solved by the technology in comparison with titanium hydride as a foaming agent. The technology comprises the following concrete steps: adding the pure magnesium block to the aluminum melt; adding calcium carbonate after evenly agitating; agitating and foaming, carrying out water-cooling after keeping warm for a period of time, so as to obtain an aluminum foam sample of which the porosity is 50.0-85.0% and the mean pore size is about 1.0-2.0mm. The production technology is simplified, the production cost is reduced, and the technology is applicable to large-scale production under the condition of not needing tackifying.

Description

[0001] technical field [0002] The invention belongs to the field of preparation of porous metal materials, and in particular relates to a method for preparing foamed aluminum with small pore diameter without a viscosifying melt foaming method. Background technique [0003] Since Sosnik of the United States first added mercury to aluminum to prepare foamed aluminum in 1948, foamed aluminum has good damping performance, energy absorption performance, sound absorption, sound insulation and heat insulation performance due to its low density, high specific strength and specific stiffness. It has excellent functional compatibility and has always attracted relevant researchers from various countries to explore its preparation, performance and application. It is one of the most widely used metal foams so far. There are many methods for preparing aluminum foam, among which the melt foaming method has become the first choice for large-scale production because of its simple equipment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C21/00
Inventor 杨东辉胡中芸李军江静华马爱斌陈建清陈伟萍
Owner HOHAI UNIV
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