羰基铁粉/氢化丁腈橡胶吸波材料的性能研究

Study on Properties of CIP/HNBR Wave Absorbing Material

以羰基铁粉为吸收剂,氢化丁腈橡胶为基体制备了吸波材料,采用矢量网格法测定了不同羰基铁粉的电磁参数,利用电磁理论分析了吸波材料的吸波性能,并采用弓形法测定了吸收剂含量、种类、复合方式对材料吸波性能的影响。结果表明,对于1mm吸波材料,当羰基铁粉体积分数达到55%时,在8.2GHz处反射率出现最小值为-14.8dB;随着体积分数继续增加,吸波材料的反射率变化不大,最大吸收峰向低频移动,吸波频带有变窄趋势;相较于单独使用一种吸收剂,合理的吸收剂复配比例可以使反射率频带增大;对于厚度为1/1的双层复合结构,复合材料的吸收峰尖锐程度受表面吸收层特性影响较大,吸收峰的峰值和位置处于两种材料之间。且该吸波材料可以在对耐油有一定要求的环境中使用。

The radar absorbing material(RAM)was prepared by the carbonyl iron powder(CIP)and hydrogenated butadiene-acrylonitrile rubber(HNBR)as its absorbent and matrix.The electromagnetic parameters of CIP were studied by a vector network analyser,and the microwave absorption properties were analyzed using the electromagnetic theory,and the effects of the content,the varieties and compound way of CIP on the absorbing properties of materials were studied by arch method.The results showed that the minimum reflectivity of RAM with thickness of 1 mm was-14.8 dB at 8.2 GHz when CIP volume content was 55%.As the volume content increased,the reflectivity of RAM had little change,the maximum absorption peak moved to low frequency band,and the absorption bandwidth showed to be minished.Compared with using one absorbent alone,a reasonable proportion of absorbents could increase the absorption bandwidth of the appointed reflectivity.The sharpness of the absorption peak of the composite material was affected by the characteristics of surface absorbing layer for the composite structure that the thickness ratio of two layers was 1∶1.The peak value and position of absorption peaks were between the two materials.Furthermore,the material could be used in the environment with certain oil resistance requirements.