(中南大學(xué) 冶金科學(xué)與工程學(xué)院，長(zhǎng)沙 410083)
摘 要: 采用反重力滲流鑄造法成功制備了開孔泡沫鋁材料，對(duì)比研究反重力滲流鑄造和傳統(tǒng)真空滲流法制備的開孔泡沫鋁的聲學(xué)性能。結(jié)果表明：兩種方法所制備的泡沫鋁在高頻段的吸聲系數(shù)均高于低頻段的，且在低頻段的吸聲系數(shù)差別不大；在高頻段，反重力滲流鑄造所得材料的吸聲系數(shù)明顯優(yōu)于傳統(tǒng)真空滲流法所制備材料的，原因是反重力滲流法使泡沫鋁中相鄰孔洞的連通空間減小；在反重力滲流鑄造制備的開孔泡沫鋁材料中，造孔粒子粒徑與平均吸聲系數(shù)成反比，孔隙率與平均吸聲系數(shù)成正比，增大泡沫鋁的厚度有利于提高其吸聲性能。
關(guān)鍵字: 開孔泡沫鋁；反重力滲流鑄造；吸聲系數(shù)；孔隙率
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The sound absorption properties of the open-celled aluminum foams prepared by the counter-gravity infiltration casting method and traditional process were investigated, respectively. The results show that all the samples prepared by two kinds of infiltration casting methods have the uniform change trend, i.e., the sound absorption coefficient in high-frequency region is higher than that in low-frequency region. The sound absorption property of the sample prepared by the former method is better than that of the sample prepared by the latter method in high-frequency region, which is due to the decrease of connected space between adjacent holes in counter-gravity infiltration casting. The sound absorption coefficient of open-cell aluminum foam prepared by counter-gravity infiltration casting method increases with the particle size decreasing and with the porosity and thickness increasing.
Key words: open-celled aluminum foams; counter-gravity infiltration casting; sound absorption coefficient; porosity
