Shielding Effectiveness of Composites Containing Flaky Inclusions

作     者：WANG Qingguo QU Zhaoming WANG Yilong 

作者机构：Institute of Electrostatic & Electromagnetic Protection Mechanical Engineering College Shijiazhuang 050003 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China 

出 版 物：《高电压技术》 (High Voltage Engineering)

年 卷 期：2013年第39卷第8期

页      面：1995-1999页

核心收录：

学科分类：07[理学] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0702[理学-物理学] 

基　　金：Project supported by Equipment Pre-research Foundation of China (9140A31030110JB3403) 

主　　题：多层复合材料 屏蔽效能 夹杂物 片状 微观结构参数 实验数据 羰基铁粒子 电磁屏蔽 

摘      要：To investigate the quantitative relationship between the electromagnetic-shielding property of composites and the distribution of inclusions, a scheme for predicting the shielding effectiveness of composites containing variously-distributed flaky inclusions is proposed. The scheme is based on equivalent parameters of homogeneous comparison materials and the plane-wave shielding theory. It leads to expli- cit formulas for the shielding effectiveness of multi-layered composites in terms of microstructural parameters that characterize the shape, distribution and orientation of the inclusions. For single layer composite that contains random and aligned flaky silver-coated carbonyl-iron particles with fractions of different volume, the predicted shielding effectiveness agrees well with the experimental data. As for composites containing aligned flaky particles,the shielding effectiveness obtained by the proposed scheme and experiment data is higher than that the random case, e.g. about 20 dB higher at 750 MHz. The proposed scheme is a straightforward method for optimizing future composite de- signs.