Through-cell aluminum foam refers to aluminum foam whose internal pores are interconnected, with a pore size of 0.5-1.0 mm, a porosity of 70-90%, and a through-porosity of 55-65%.Through-hole aluminum foam has excellent sound absorption performance and fire resistance due to its own metal characteristics and porous structure. The noise reduction coefficient NRC>0.75, the fire rating is A1, and the through-hole aluminum foam can be customized with different flow resistances and different through-hole apertures (through-hole ratio). Under normal circumstances, the sound absorption mechanism of foam aluminum basically relies on viscous sound absorption and thermal conduction sound absorption. The sound absorption effect in this case is not obvious.The through-cell aluminum foam we produce makes the aluminum foam structure more in line with the sound-absorbing structure. The tiny channels and cells formed inside form a large number of abrupt cross-sections and a large number of side-branched Helmholtz resonant cavities to achieve sound absorption. In particular, the sound absorption effect for medium and low frequencies is obviously better than that of traditional materials.
