A kind of preparation method of closed-cell metal foam
A closed-cell foam and metal technology, applied in the field of metal foam, can solve the problems of difficult to obtain foam metal materials, difficult to control the size of bubbles, difficult to master, etc., to achieve the effects of complete structure, energy saving and cost reduction
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Embodiment 1
[0022] Embodiment 1, with reference to figure 1 , a preparation method of closed-cell copper foam, comprising the following steps:
[0023] 1) Ventilation: Put the EPS foam particles into the piston-type pumping air pipeline, the EPS foam particle size is 3mm, push the piston to squeeze out the air, pull back the piston and fill it with argon gas, wait for the shape of the EPS foam particles to recover, pump repeatedly Deflate 3 times to completely replace the air in the EPS foam particles;
[0024] 2) Hanging glue: Take out the EPS foam particles that have replaced the air and put them into the filter screen, immerse the filter screen in a container filled with polyvinyl alcohol, take it out again, and stick a layer of polyvinyl alcohol on the surface of the EPS foam particles;
[0025] 3) Powder sticking: Use a powder sprayer to evenly spray a layer of copper powder with a thickness of 0.2mm on the surface of the EPS foam particles stuck to polyvinyl alcohol. The copper pow...
Embodiment 2
[0029] Embodiment 2, except that the EPS foam particle size selected in step 1) is 1 mm, all other steps and process parameters are the same as in embodiment 1.
Embodiment 3
[0030] Embodiment 3, except that the EPS foam particle size selected in step 1) is 5mm, all other steps and process parameters are the same as in embodiment 1.
[0031] The stress-strain curve of the closed-cell copper foam prepared by embodiment 1, 2, 3 is as follows figure 2 As shown, the compression process of the three groups of closed-cell copper foams has gone through three stages to varying degrees. The first stage is the elastic deformation stage, which is in the interval of ε0.55, which is In the first stage, due to the destruction of the cell wall, the closed-cell copper foam is compacted and no longer has good energy absorption capacity. Compared figure 2 Among the three groups of curves, it is found that when the porosity is the same, the bearing capacity of the foamed copper decreases with the increase of the pore diameter, and the three groups of curves all have an obvious platform area, and this platform area decreases with the increase of the pore diameter....
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Abstract
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