Certain opening rate can be formed through proper compression of closed cell aluminum alloy foam to produce cracks or proper drilling treatment. When sound waves enter cracks or pores, they are dissipated by friction against the wall of the hole, thus producing a good sound absorption effect.
The excellent acoustic performance of closed cell aluminum alloy foam makes it play an important role in the sound insulation of expressway, urban track and viaduct, and automobile muffler. It can also be used as an ideal material for noise reduction in public places, such as concert hall, wall, ceiling and curtain wall.
