以渗流法制备的宽孔径孔结构、周期孔结构及梯度孔结构三类非常规孔结构Al-Si12泡沫为芯材,制作了Al-Si12泡沫芯消声器,对其吸声性能进行了研究。结果表明,宽孔径孔结构Al-Si12泡沫芯消声器的吸声效果明显优于常规孔结构Al-Si12泡沫芯消声器;梯度孔结构Al-Si12泡沫芯消声器的吸声性能比宽孔径孔结构泡沫铝芯消声器优越;周期孔结构的泡沫铝芯消声器与宽孔径孔结构泡沫铝芯吸声性能相当;Al-Si12泡沫芯消声器的吸声性能与扩张室结构及流阻有关;与传统吸声材料芯消声器相比,宽孔径孔结构的Al-Si12泡沫芯消声器的吸声性能介于离心玻璃棉芯消声器及聚氨酯泡沫芯消声器之间。
The unconventional cell structure Al-Si12 foams,such as Al-Si12 foam with wide pore size range pore structure,Al-Si12 foam with periodic pore structure and Al-Si12 foam with gradient pore structure,were fabricated by infiltration method as the core materials of the mufflers.The sound absorption property of the unconventional cell Al-Si12 foam core muffler has been studied.The results shown as followings.The sound absorption property of the wide pore size range pore structure aluminum foam core muffler is obviously superior to these with traditional pore structure.The sound absorption performance of the gradient pore structure aluminum foam core muffler is much better than these with wide pore size range pore structure.The sound absorption performance of the periodic pore structure aluminum foam core muffler is as good as these with wide pore size range pore structure.The sound absorption performance of the Al-Si12 foam core muffler is related with expansion chamber structure and flow resistance.Compared with traditional sound absorption materials core muffler,the sound absorption property of the wide pore size range pore structure aluminum foam core muffler is situated between the polyurethane foam core muffler and the centrifugal glass cotton core muffler.
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