(1. 北京有色金屬研究總院 能源材料與技術(shù)中心，北京100088；
2. 東北大學(xué) 材料與冶金學(xué)院，沈陽(yáng) 110004)
摘 要:
利用熔體轉(zhuǎn)移發(fā)泡法制備閉孔泡沫鋁，從孔徑大小、打孔率、背后空腔以及背后貼膜方面對(duì)其吸聲性能進(jìn)行研究。結(jié)果表明：孔徑大的閉孔泡沫鋁吸聲系數(shù)要遠(yuǎn)好于孔徑小的閉孔泡沫鋁的吸聲系數(shù)；打孔后閉孔泡沫鋁吸聲系數(shù)有了明顯的提高，當(dāng)分別打孔0.5%、1%和2%后，閉孔泡沫鋁最高吸聲系數(shù)從0.42分別增加到了0.53、0.75和0.96；打孔閉孔泡沫鋁背后加空腔吸聲曲線都表現(xiàn)出明顯的亥姆霍茲共振器吸聲特性，且隨空腔厚度的不斷增加，低頻吸聲系數(shù)逐漸增加，高頻吸聲系數(shù)逐漸降低，最高吸聲系數(shù)向低頻遷移；背后貼膜閉孔泡沫鋁吸聲特性曲線出現(xiàn)峰值吸聲特征消失的現(xiàn)象，表現(xiàn)出吸聲系數(shù)隨頻率增加而增加的特性。
關(guān)鍵字: 泡沫鋁；閉孔；吸聲性能；影響因素
（1.Centre of Energy Material and Technology, Beijing General Research Institute for Nonferrous Metals, Beijing 100088,China;
2. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China）
Abstract: Closed-cell aluminum foam was prepared by the method of molten body transitional foaming process, and the sound absorption properties were studied from the aspects of cell diameter, perforation rate, cavity thickness and aluminum foil attached behind. The results show that at the same porosity, the sound absorption coefficient of closed-cell aluminum foam with larger cell diameter is larger than that with smaller cell diameter; the sound absorption coefficient of closed-cell aluminum foam increases obviously after being perforated, when the perforation ratios are 0.5%, 1% and 2%, the highest sound absorption coefficient can reach 0.53, 0.75 and 0.96 from 0.46, respectively; the sound absorption curves of closed-cell aluminum foams after being perforated show obvious sound absorption characteristic of Helmholtz resonator; with increasing the cavity thickness, the sound absorption coefficient increases under low-frequency region, and decreases under high-frequency region; the highest sound absorption coefficient increases slightly, but shows the trend of traveling to low-frequency region; the peak sound absorption characteristics disappear when the closed-cell aluminum foams are attached with aluminum foils, and the sound absorption coefficient shows increasing characteristic with in creasing frequency.
Key words: aluminum foam; closed-cell; sound absorption property; influencing factors
