Sound absorption properties of open-cells aluminum foams prepared by infiltration casting methods

The sound absorption properties of the open-celled aluminum foams prepared by the counter-gravity infiltration casting method and traditional process were investigated, respectively. The results show that all the samples prepared by two kinds of infiltration casting methods have the uniform change trend, i.e., the sound absorption coefficient in high-frequency region is higher than that in low-frequency region. The sound absorption property of the sample prepared by the former method is better than that of the sample prepared by the latter method in high-frequency region, which is due to the decrease of connected space between adjacent holes in counter-gravity infiltration casting. The sound absorption coefficient of open-cell aluminum foam prepared by counter-gravity infiltration casting method increases with the particle size decreasing and with the porosity and thickness increasing.