( 1. 合肥工业大学 材料科学与工程学院， 合肥 230009;
2. 中国科学院 固体物理研究所 内耗和晶体缺陷开放实验室，
合肥 230032;
3. 中国科学技术大学 化学物理系， 合肥 230026)
摘 要: 采用粉末冶金发泡法制备闭孔泡沫铝， 通过调整发泡剂含量、 发泡温度、 粘度、 保温时间等手段， 制得孔隙率可调、 孔洞分布均匀的闭孔泡沫铝样品， 并测试了不同孔隙率、 孔径泡沫铝样品的电磁屏蔽性能。 结果表明： 在100~1000MHz内， 泡沫铝的电磁屏蔽性能在60~90dB之间， 且随着孔隙率、 孔径的增加， 泡沫铝的电磁屏蔽性能下降。
关键字: 闭孔泡沫铝； 孔隙率； 孔径； 电磁屏蔽
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
