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| Prediction of Shielding Properties on Electromagnetic Shielding Composites |
| QU Zhaoming, WANG Qingguo, QIN Siliang, HU Xiaofeng |
| Institute of Electrostatic & Electromagnetic Protection, Ordnance Engineering College, Shijiazhuang 050003 |
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Cite this article:
QU Zhaoming WANG Qingguo QIN Siliang HU Xiaofeng. Prediction of Shielding Properties on Electromagnetic Shielding Composites. Chin J Mater Res, 2012, 26(4): 419-424.
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Abstract The effective electromagnetic parameters physical model of composites with ellipsoidal particles was established and prediction formulas of composites’ shielding properties were derived based on variational principle and electromagnetic wave transmission theory. The shielding effectiveness and reflectivity of composites under different filling conditions were calculated and the influence laws of fillings’ microstructure characters (concentration, shape, size and distribution mode) to shielding properties of composites were investigated. The shielding effectiveness and reflectivity of composites improve with the increase of concentration and aspect ratio of fillers, the needle and flaked fillers are better than spherical fillers and the directional distribution is better than random distribution, the reflectivity of composites in certain concentration and size of fillers exists peak value. The shielding composites with spherical carbonyl iron and nickel-plated short carbon fibers were prepared and the results of the numerical calculation of shielding effectiveness are in good agreement with the experiment data, the validity of proposed scheme was verified.
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Received: 26 April 2012
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| Fund: Supported by Equipment Pre-research Foundation of China and the National Natural Science Foundation of China No.61001050. |
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