Abstract
ZnO micro-rods with the diameter of 2.5 μm and the length of 30 μm were synthesized on the cell walls of open celled Al foam via hydrothermal method with the aim of improving its sound absorption properties. The effectiveness of the method was verified by the characterization of morphologies and phase structures of ZnO micro-rods. The comparison tests show that the ZnO seeds layer and relatively rough cell surface of Al foam play important roles in promoting the growth of ZnO micro-rods. By the modification, the flow resistance of the foam increased about 72% and the sound absorption coefficient increased about 40% in maximum.
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