利用磁控溅射法对空心玻璃微球表面镀Al.研究了由镀Al空心玻璃微球-FeCo合金/环氧树脂制成的复合材料在2～18 GHz频段范围内的电磁特性,利用模型计算了所制备样品的微波反射率.结果表明,在镀Al空心玻璃微球和FeCo合金粉末总体积分数一定的条件下,随着镀Al空心玻璃微球与FeCo合金体积比的增加,复合材料介电常数实部ε′减小,虚部ε″变化不明显;磁导率的实部μ′和虚部μ″均减小;反射率峰值向高频方向移动.当镀Al空心玻璃微球与FeCo合金体积比2∶1时,涂层厚度为2 mm,吸收峰值达到-29.69 dB,其面密度仅为3.71 kg/m2,吸收率小于-10 dB的带宽达到2.4 GHz.由此可见,通过改变镀Al空心玻璃微球与FeCo合金的体积比,可以调节电磁参数,提高材料的吸波性能.
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