论文部分内容阅读
采用加压铸造工艺制备了多孔铝合金。多孔铝合金的孔隙尺寸为0．5～1．6mm，孔隙率为60％～80％，通孔率为85％～11％，最大制品尺寸为11mm×100mm。多孔金属具有较大的吸声系数，不同的多孔铝合金其吸声系数随频率的变化趋势基本相同。当声波频率增加时，多孔铝合金的吸声系数增大。减小孔隙尺寸和增加孔隙率，多孔铝合金的吸声系数增大。当声波频率在3．5kHz时，吸声系数达到最大。
Porous aluminum alloy was prepared by pressure casting process. The porous aluminum alloy has a pore size of 0.5-1.6 mm, a porosity of 60% -80%, a through-hole rate of 85% -11% and a maximum product size of 11 mm × 100 mm. Porous metal has a larger sound absorption coefficient, the different porous aluminum alloy its absorption coefficient with the frequency of the trend is basically the same. When the sound frequency increases, the sound absorption coefficient of porous aluminum alloy increases. Reduce pore size and increase porosity, the sound absorption coefficient of porous aluminum alloy increases. When the sound frequency at 3.5kHz, the maximum absorption coefficient.