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A kind of three-dimensional space ordered pore structure aluminum foam and its preparation method
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A three-dimensional space and pore structure technology, applied in mechanical equipment, heat exchange equipment, rotors, etc., can solve the problems of inability to control and adjust structural parameters arbitrarily, poor porosity, pore structure uniformity and connectivity, etc., and achieve good energy absorption characteristics , Excellent compression performance, uniform pore size
Active Publication Date: 2016-12-07
CHINA THREE GORGES UNIV
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Problems solved by technology
However, the existing foamed aluminum preparation methods cannot arbitrarily control and adjust the structural parameters, and the porosity, uniformity and connectivity of the pore structure are also poor.
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Embodiment 1
[0027] Step 1. The aluminum block and the magnesium block are melted in a vacuum furnace according to the ratio of Al-2.5Mg to form an alloy liquid, and the melting temperature is 690° C., wherein the purity of the aluminum block and the magnesium block is greater than 99.5%.
[0028] Step 2. Mix 1% of silane coupling agent, 20% of composite polyamine curing agent, and the rest of asphalt to make bonding powder, mix 30% of bonding powder with 70% graphite for ball milling, and graphite It is natural flake graphite, passed through a 200-mesh sieve to obtain 3D printed powder;
[0029] Step 3. Use 3D printing laser sintering powder to obtain graphite skeleton 1 with an ordered structure of three-dimensional space network. 4 diagonal lines through the central point, where the diameter of the graphite skeleton is 2mm, such as figure 1 shown;
[0030] Step 4, graphitize the graphite skeleton obtained with the ordered structure of the three-dimensional space network, place the gra...
Embodiment 2
[0033] Step 1. The aluminum block and the magnesium block are melted into alloy liquid in a vacuum furnace according to the ratio of Al-2Mg, the melting temperature is 690°C, and the purity of the aluminum block and the magnesium block is greater than 99.5%.
[0034] Step 2. Mix 1% of silane coupling agent, 20% of composite polyamine curing agent, and the rest of asphalt to make bonding powder, mix 30% of bonding powder with 70% graphite for ball milling, and graphite It is natural flake graphite, passed through a 200-mesh sieve to obtain 3D printed powder;
[0035] Step 3. Use 3D printing laser sintering powder to obtain graphite skeleton 2 with an ordered three-dimensional space. The difference from graphite skeleton 1 is that on the basis of graphite skeleton 1, there are six diagonals of body-centered cubic planes. The skeleton of the corner line is 12 graphite skeletons of 1mm, such as figure 2 shown;
[0036] Step 4, graphitize the graphite skeleton obtained with the ...
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Abstract
The invention discloses foam aluminum with a three-dimensional (3D) space ordered pore structure and a preparation method thereof. The structure is formed by taking body centered cubic cells in space lattices as a base. The preparation method comprises the following concrete steps: heating aluminum alloy in vacuum atmosphere until the aluminum alloy is molten; uniformly mixing graphite particles with asphalt, a coupling agent and a curing agent to obtain 3D printed powder; sintering the powder by utilizing 3D printed laser to obtain a graphite framework with a 3D space network ordered structure, graphitizing the graphite framework, putting the graphitized graphite framework into a mold, and directly pouring the aluminum alloy liquid onto the graphite framework to obtain an aluminum and graphite composite material; and putting the aluminum and graphite composite material in the oxygen atmosphere to carry out oxidative combustion many times, and after each time of combustion, carrying out ultrasonic washing to obtain foam aluminum with a 3D space ordered pore structure. According to the invention, the pore diameter, the pore communication path and the apparent density of foam aluminum can be designed by controlling the graphite framework with the 3D space network ordered structure, so that prepared foam aluminum is more suitable for industrial demands.
Description
technical field [0001] The invention relates to a method for preparing foamed aluminum, in particular to a method for preparing foamed aluminum with a three-dimensional space ordered pore structure. Background technique [0002] Aluminum foam is a new type of lightweight structural functional material, with high specific stiffness, high specific strength, excellent impact resistance, high energy absorption performance, and also has functions such as heat insulation, sound insulation, sound absorption, electromagnetic shielding, and Low cost, recyclable, non-toxic, is an economical and environmentally friendly material. Aluminum foam can be widely used in the fields of automobile industry, aerospace, construction industry and railway transportation, etc. It has also been widely used in the fields of metal electrodes, adsorption materials, sound-absorbing materials, flame arresters, water purification and heat exchange materials, etc. It occupies an irreplaceable position in ...
Claims
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