钩针工艺之于活性碳纤维/环氧树脂电路屏吸波复合材料的设计

通过钩针工艺将活性碳纤维(ACF)和玻璃纤维(GF)混编,提高了频率选择性表面(FSS)的可设计性和复杂性,制备了ACF钩针结构单元电路屏碳纤维/环氧树脂(ACF/EP)复合材料。研究了不同编织结构和ACF质量分数对复合材料吸波性能的影响。结果表明:ACF质量分数为100%的4针枣形FSS的ACF/EP复合材料和质量分数为50%的16针枣形FSS复合材料的最大反射损耗(RL)可以达到-50dB以上,有效吸收带宽(RL-10dB)达10GHz以上。复杂的钩针设计使ACF/EP复合材料的多孔结构增多,有效吸收带宽变宽,4针枣形结构具有较多不规整孔径使吸波效果显著。适量的ACF质量分数结合编织结构有利于获得理想的CF/EP吸波复合材料。

Crochet process in design of activated carbon fibers/epoxy circuit screen composites with high microwave absorbing

Crochet process was specially applied to combine activated carbon fibers (ACF)with glass fibers (GF) to improve the designability and complexity of frequency selective surface (FSS),ACF crochet structure circuit screen carbon fibers/epoxy(ACF/EP)composites were prepared.The effect of different knitted structure and ACF mass fraction to microwave absorbing performance of composites was discussed.The results show that the maxi-mum reflection loss (RL)of both 4-needle-date-shaped FSS CF/EP composites with 100% CF and 16-needle-date-shaped FSS composites with 50% CF are higher than -50 dB,in addition,the effective absorption bandwidth (RL<-10 dB)could reach to 10 GHz.With complex crochet design,the porous structure of CF/EP composites increase,effective absorption bandwidth(RL<-10 dB)broaden,and 4-needle-date-shaped structure with more irregular aperture has excellent microwave absorbing property.Ideal CF/EP microwave absorbing composites will be obtained by combining the suitable mass fraction of chopped CF and knitted structure.