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石墨–碳纤维水泥基复合材料的电磁屏蔽效能
作者:黄少文 陈光华 邓敏 唐明述  
单位:南京工业大学材料科学与工程学院 南昌大学材料科学与工程学院  
关键词:屏蔽效能  水泥基材料  石墨  碳纤维 
分类号:TB332
出版年,卷(期):页码:2010,38(4):549-552
DOI:
摘要:

采用同轴法兰–网络分析仪法研究了石墨–碳纤维水泥基材料在100kHz~1.5GHz频率范围内的电磁屏蔽性能。结果表明:水泥中石墨掺量接近渗滤阈值时,材料的屏蔽效能可获得明显改善。胶体石墨的屏蔽效能要明显好于鳞片石墨的,石墨的细度以25μm为宜,超过25μm对进一步改善屏蔽效果作用不大。碳纤维能显著提高材料的屏蔽效能,复掺石墨及碳纤维可使水泥基材料的屏效值进一步提高,其屏效值在测试频段内最高可达24dB。

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The electromagnetic shielding effectiveness of graphite–carbon fiber cement based materials were measured by taking the coaxial planar–network analyzer method in the frequency range of 100 kHz–1.5 GHz.Results show that the electromagnetic shielding effectiveness of composites is obviously improved when the amount of graphite attain percolation threshold.The effect of shielding effectiveness of colloidal graphite is obvious superior to that of flake graphite.The most adoptable fineness of graphite is 25 μm,the shielding effectiveness further increases when the fineness of graphite is over 25 μm.The addition of carbon fiber can significantly increase electromagnetic shielding effectiveness of the materials.The addition of flake graphite and carbon fiber at the same time can further improve the electromagnetic shielding effectiveness of the cement based materials,and reaches the maximum of shielding effectiveness of 24 dB in the tested frequency range.

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基金项目:
江西省教育厅科技基金(GJJ09028)资助项目
作者简介:
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参考文献:

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