以膨胀珍珠岩作为阻抗匹配层,以碳纳米管和铁氧体作为吸波剂制备双层水泥基吸波体,采用 RCS法(radar cross section)研究水泥基吸波材料的吸波性能.实验结果表明,匹配层的透波率随着膨胀珍珠岩掺量的增加而增大,在8~18 GHz频率范围内,掺有20％膨胀珍珠岩试样透波率介于20％~60％之间；以膨胀珍珠岩的水泥浆体作为匹配层制备的双层水泥基材料,其吸波性能要优于相同厚度单层吸波材料；当匹配层中膨胀珍珠岩掺量增加时,吸波性能也随着增加；以0．15％碳纳米管和10％FP型铁氧体作为复合吸波剂制备吸波层,具有优异的吸波性能,并且匹配层与吸波层的最佳厚度比为3∶1；而当吸波层复掺0．75％碳纳米管和30％FP 型铁氧体时,双层吸波材料的吸波性能比相同厚度单层吸波材料要差,匹配层与吸波层的最佳厚度比为1∶3,试样反射率的峰值为－31．0 dB,低于－7 dB的带宽达10．6 GHz.
Double-layer cement-based absorbing materials were prepared by using expanded perlite as the imped-ance matching layer,carbon nanotube and ferrite as absorbing agent and performance of the absorbing materials was studied by space method and the far field (radar cross section)RCS method.The experimental results showed that:transmission efficiency of matching layer increases with the increase of dosage of expanded perlite and within the scope of the 8 to 18 GHz,transmission efficiency of samples mixed with 20% expanded perlite is ranged from 20%-60%;the absorbing performance of double-layer absorbing materials is superior to single-lay-er absorbing materials with the same thickness;When the dosage of expansive pearlite increases,wave absorp-tion performance also increases;absorbing layer mixed with 0.15% carbon nanotubes and 10% FP type ferrite has excellent absorbing performance,and the best ratio of thickness of matching layer and absorbing layer is 3∶1;When absorbing layer is mixed with 0.75% carbon nanotubes and 30% FP type ferrite,absorption perform-ance of double-layer absorbing materials is worse than the same thickness of single-layer absorbing materials and the best ratio of thickness of matching layer and absorbing layer is 3∶1 ,the peak of reflectivity is-31.0 dB,bandwidth below -7 dB is 10.66 GHz.
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