镀铝玻纤复合材料电磁屏蔽性能探讨
Research on Electromagnetic Shielding Effectiveness of Al-glass
Fiber Composite Material
摘 要 以镀金属铝玻璃纤维为导电填料,填充热固性酚醛树脂制备出电磁屏蔽复合材料。通过测试和分析发现,一定长度下以镀铝玻纤作为导电填料仍然具有阈值性质,且填充量大于40wt%后,材料的屏蔽效能开始保持稳定。同时,用经典的同轴线模型公式估算了相同体积电阻下材料的屏蔽效能,发现其值与实测值具有一定偏差。最后,分析了偏差的原因,指出材料自身结构亦是获得较高屏蔽效能的重要手段之一。
关键词 电磁屏蔽;复合材料;镀铝玻璃纤维
Abstract The electromagnetic shielding composite material which consisting by Al-glass
fiber and phenolic resin is introduced.Its percolation threshold of the volume resistance
is 11%, however, the shielding effectiveness will become stable only when the filling
weight of Al-glass fiber reaches 40%.Meanwhile,the calculated result from Schelkunoff
formula is different from the measured value. At last, the structure of the material is
analyzed, which is one of the important factors to gain higher shielding effectiveness.
Keyword: electromagnetic shielding; composite materials; Al-glass fiber
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