POROUS ALUMINUM FOR SOUND-ABSORBING PLATE AND FABRICATION METHOD THEREFOR

摘要

PURPOSE: A method for fabricating porous aluminum sound-absorbing material is provided to improve noise reduction characteristics and reduce production cost by reducing quantity of aluminum per unit volume required in sintered porous aluminum sheet, and a porous aluminum sound-absorbing material fabricated by the method is provided. CONSTITUTION: The method comprises the steps of mixing pure aluminum powder as a base material with aluminum alloy powder as a binder, stacking the mixed powder as evenly dispersing the mixed powder into a mold on which at least one or more projecting parts are formed, and sintering the mixed powder under vacuum condition, inert gas atmosphere or hydrogen gas atmosphere in the state that a load is applied to the mixed powder in the mold so that an indentation part having the same shape as the projecting parts is formed on at least one side surface of sintered green compact, wherein the aluminum alloy is one or more alloys selected from Al-Zn, Al-Si, Al-Cu, Al-Ni and Al-Mg, wherein content of a metal bonded to aluminum in the aluminum alloy is in the range of 10 to 40 wt.%, wherein the aluminum powder and aluminum alloy powder are formed in a spherical shape, needle shape or filament, wherein cross sectional shape of the projecting parts is circle, polygon or a mixture thereof, wherein the load applied to the mixed powder is in the range of 20 to 80 g/cm¬2, and wherein the sintering is performed in the sintering temperature range of 550 to 660 deg.C for the sintering time range of 10 min to 2 hrs.