Sound Absorption Property of Al-Si12 Alloy Foam Muffler
Al-Si12 alloy foams were fabricated by filtration method,and the foam core mufflers were made by the fabricated Al-Si12 alloy foams.The preparation and sound absorption property of the foam core muffler was studied.The results show that sound absorption property of the foam core muffler is closely related to the pore structure,the length of Al-Si12 alloy foam core and the sound frequency.Sound absorption coefficient increases with such factors as the decrease of pore diameter,the increase of the foam core length,the widening of the pore diameter range of Al-Si12 alloy foam core,and the increase of sound frequency.In addition,sound absorption property of muffler with the mixed pore structure of big pore(80 vol%) and small pore(20vol%) is much better than other three kinds of mufflers with single pore structure.