泡沫铝具有独特的孔隙结构参数及透过性(1 ) ,据文献 (2 )报道 ,在 2 5 0～ 1 0 0 0 Hz区域 ,发泡铝的平均吸声系数 α可达到峰值。由于泡沫铝同时具有耐热、耐振、耐腐蚀、可加工等金属特性 ,因而 ,对气体排放过程的吸声降噪具有特殊意义。众所周知 ,泡沫铝属于 90年代中期国 Aluminum Foam has unique pore structure parameters and permeability (1). According to the literature (2), it is reported that the average sound absorption coefficient α of foamed aluminum can reach the peak value in the region of 2500 ~ 1000 Hz. As the aluminum foam has both heat-resistant, vibration-resistant, corrosion-resistant, Machinable metal properties, and therefore, the process of gas emission noise reduction is of special significance. As we all know, aluminum foam belongs to the mid-90s