A kind of functional gradient aluminum foam and preparation method thereof
A functionally graded, foamed aluminum technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of inability to precisely control foam porosity, pore size, poor structure and performance of gradient foamed aluminum, and deterioration of matrix adhesion, etc. Good energy absorption effect, uniform cell distribution, stable and reliable method
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Embodiment 1
[0041] A functionally graded aluminum foam with upper and lower layers, comprising a carbon nanotube-reinforced foamed aluminum matrix composite material layer with a porosity of 50% and a pure foamed aluminum layer with a porosity of 70%.
[0042] The gradient aluminum foam of this embodiment is prepared by the following method:
[0043] (1) Calculate and weigh the composite powder and pore-forming agent of pure aluminum powder, carbon nanotubes and aluminum powder required for two layers, and the carbon nanotube reinforced foamed aluminum-based composite material layer takes by weighing 14.33g urea particles (2mm), Take by weighing 28.78g carbon nanotube / aluminum composite powder (carbon nanotube content 3wt.%) as group 1; Pure foamed aluminum layer takes by weighing 20.06g urea particle (2mm), takes by weighing 17.45g pure aluminum powder (180 order) as Group 2;
[0044] (2) Add dropwise 5% ethanol by mass fraction to each group of mixed powders, and mix evenly to obtain a...
Embodiment 2
[0048] A functionally graded aluminum foam with upper, middle and lower layers, the upper and lower layers have a porosity of 70%, corresponding to a pure foamed aluminum layer, and the middle layer has a porosity of 60%, corresponding to a carbon nanotube-reinforced foamed aluminum-based composite material layer.
[0049] The gradient aluminum foam of this embodiment is prepared by the following method:
[0050] (1) Calculate and weigh the composite powder and pore-forming agent of pure aluminum powder, carbon nanotubes and aluminum powder required for the three layers. The pure foamed aluminum layer takes 13.38g urea particles (1.5mm), and weighs 11.64g pure Aluminum powder (180 mesh) is as group 1 and group 3; Carbon nanotube reinforced foamed aluminum matrix composite material layer takes by weighing 11.47g urea particle (1.5mm), takes by weighing 15.32g carbon nanotube / aluminum composite powder (carbon nanotube content 2wt.%) as group 2;
[0051] (2) Add dropwise 5% etha...
Embodiment 3
[0055] A four-layer functionally graded aluminum foam, the porosity of the uppermost layer and the lowermost layer is 70%, corresponding to the pure foam aluminum layer; the porosity of the middle and upper layers is 50%, corresponding to 1.5wt.% carbon nanotube reinforced aluminum foam matrix composite material layer; the middle and lower layers have a porosity of 50%, corresponding to a 3wt.% carbon nanotube-reinforced foamed aluminum matrix composite material layer.
[0056] The gradient aluminum foam of this embodiment is prepared by the following method:
[0057] (1) Calculate and weigh the composite powder and pore-forming agent of pure aluminum powder, carbon nanotubes and aluminum powder required for the four layers, take 10.03g urea particles (1.5mm) for the pure foamed aluminum layer, and weigh 8.73g pure Aluminum powder (180 mesh) is as group 1 and group 4; Carbon nanotube reinforced foamed aluminum matrix composite material layer takes by weighing 7.16g urea partic...
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