特殊孔结构ZA27合金泡沫的吸声性能Sound absorption properties of ZA27 alloy foams with particular pore structures

通过渗流铸造法制备宽孔径范围、层状梯度、层状周期3种特殊孔结构的ZA27合金泡沫，并对其吸声性能进行研究。结果表明：随频率的升高，低频区吸声系数增加，中频区吸声系数降低到一个最小值后上升，高频区吸声系数趋于平缓；宽孔径范围ZA27合金泡沫随孔径变化及孔隙率的增加吸声系数平均提高0.025；层数多的层状梯度孔结构的吸声性能相对层数少的梯度孔结构平均提高0.037；层数多的层状周期孔结构的吸声性能比层数少的周期孔结构平均提高0.027；特殊孔结构ZA27合金泡沫在低频区的吸声性能优于特殊孔结构Al-Si12合金泡沫的。

The sound absorption properties of ZA27 infiltration casting foams with three kinds of particular pore structures such as wide aperture, layered gradient and layered periodical were studied. The results show that, with increasing the frequency, the sound absorption coefficient increases in low frequency region, while decreases to minimum value and then moves up in intermediate frequency region, and tends to be gentle in high frequency region. The sound absorption coefficient of alloy foam with wide aperture is average improved 0.025, along with aperture varied and porosity increased; the sound absorption property of alloy foam with multiple layers gradient pore structure is improved 0.027, compared the one that has few layers; the sound absorption property of alloy foam with layered periodical pore structure is average increased 0.027, compared the one that has few layers. At low frequency, the sound absorption properties of alloy foams with particular pore structures are better than those of the Al-Si12 alloy foams.

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