The novel decoration was used at urban tracks and traffic line, overhead roads, railway roads, cloverleaf intersections, cooling towers, outdoors high voltage direct current converter stations, and concrete mixing sites and so on. And it can conduct sound-shielding function by sucking in sound, isolating sound, and eliminating sound to equipment like diesel engines, generators, electric motors, freezers, air compressors, and blowers and so on. Metal foam has a complex microstructure consisting of an interconnected network. The different pore size and relative density determine the complex microstructure and the mechanical properties. The metal foam has not only characteristics of metal, but also a novel properties of physical, mechanical, thermal, electrical, a high coefficient of thermal conductivity. In order to apply metal foams in construction fields and use them effectively, the Structure and Sound-absorption Properties of material must be investigated.
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