( 1. 合肥工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院， 合肥 230009;
2. 中國(guó)科學(xué)院 固體物理研究所 內(nèi)耗和晶體缺陷開(kāi)放實(shí)驗(yàn)室，
合肥 230032;
3. 中國(guó)科學(xué)技術(shù)大學(xué) 化學(xué)物理系， 合肥 230026)
摘 要: 采用粉末冶金發(fā)泡法制備閉孔泡沫鋁， 通過(guò)調(diào)整發(fā)泡劑含量、 發(fā)泡溫度、 粘度、 保溫時(shí)間等手段， 制得孔隙率可調(diào)、 孔洞分布均勻的閉孔泡沫鋁樣品， 并測(cè)試了不同孔隙率、 孔徑泡沫鋁樣品的電磁屏蔽性能。 結(jié)果表明： 在100~1000MHz內(nèi)， 泡沫鋁的電磁屏蔽性能在60~90dB之間， 且隨著孔隙率、 孔徑的增加， 泡沫鋁的電磁屏蔽性能下降。
關(guān)鍵字: 閉孔泡沫鋁； 孔隙率； 孔徑； 電磁屏蔽
closed-cell aluminum alloy foams
（1. School of Materials Science and Engineering，
Hefei University of Technology， Hefei 230009， China;
2. Laboratory of Internal Friction and Defects in Solids， Institute of Solid State Physics，
Chinese Academy of Sciences， Hefei 230032， China;
3. Department of Chemical Physics，
University of Science and Technology of China，
Hefei 230026， China）
Abstract: Aluminum alloy foams are prepared by powder metallurgical method. The structure of aluminum alloy foams can be controlled by process parameters(the amount of foaming agent， heating temperature， melting time etc). The electromagnetic shielding effectiveness of aluminum alloy foam was measured as a function of cell size and porosity. The results show that the aluminum alloy foam exhibits high shielding effectiveness(from 65 to 90dB) when the frequency is between 100 and 1000MHz. The electromagnetic shielding effectiveness of aluminum alloy foams decreases with the increase of porosity and cell size.
Key words: closed-cell aluminum alloy foam； porosity； cell size； electromagnetic shielding effectiveness
