特殊孔結(jié)構(gòu)ZA27合金泡沫的吸聲性能Sound absorption properties of ZA27 alloy foams with particular pore structures

通過滲流鑄造法制備寬孔徑范圍、層狀梯度、層狀周期3種特殊孔結(jié)構(gòu)的ZA27合金泡沫，并對其吸聲性能進行研究。結(jié)果表明：隨頻率的升高，低頻區(qū)吸聲系數(shù)增加，中頻區(qū)吸聲系數(shù)降低到一個最小值后上升，高頻區(qū)吸聲系數(shù)趨于平緩；寬孔徑范圍ZA27合金泡沫隨孔徑變化及孔隙率的增加吸聲系數(shù)平均提高0.025；層數(shù)多的層狀梯度孔結(jié)構(gòu)的吸聲性能相對層數(shù)少的梯度孔結(jié)構(gòu)平均提高0.037；層數(shù)多的層狀周期孔結(jié)構(gòu)的吸聲性能比層數(shù)少的周期孔結(jié)構(gòu)平均提高0.027；特殊孔結(jié)構(gòu)ZA27合金泡沫在低頻區(qū)的吸聲性能優(yōu)于特殊孔結(jié)構(gòu)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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