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用渗流铸造法制备了3种特殊孔结构(宽孔径范围孔结构、层状梯度孔结构、层状周期孔结构)的Al-Si12泡沫,对其吸声性能进行了研究。结果表明,相同厚度下,层数多的层状梯度孔径结构泡沫铝的吸声性能优于层数少的梯度孔径结构泡沫铝;层数多的层状周期孔结构泡沫铝的吸声性能比层数少的周期孔结构泡沫铝的吸声性能略有提高;具有4层周期孔结构的Al-Si12泡沫铝样品具有较好的吸声性能,其平均吸声系数为0.82,比常规单一孔径结构的泡沫铝的平均吸声系数提高了0.21,其原因与扩张室结构、流阻及微型谐振腔有关。
Three kinds of Al-Si12 foam with special pore structure (wide pore range pore structure, layered gradient pore structure and layered periodic pore structure) were prepared by seepage casting method, and their sound absorption properties were studied. The results show that under the same thickness, the sound absorption performance of multilayered layered graded pore structure aluminum foam is better than that of the gradient aluminum foamed aluminum with small number of layers. The sound absorption performance ratio of multilayered periodic pore structure aluminum foam is The sound absorption performance of the periodic hole structure aluminum foam with a small number of layers is slightly improved. The Al-Si12 aluminum foam with 4 layers periodic pore structure has better sound absorption performance with an average sound absorption coefficient of 0.82, which is lower than the conventional single aperture The average sound absorption coefficient of the structural aluminum foam is increased by 0.21 due to the expansion chamber structure, the flow resistance and the micro-resonator.