【作者】 郭伟凯；

【导师】 李家俊； 赵乃勤；

【作者基本信息】 天津大学 ， 材料学， 2004， 硕士

【摘要】 用热压法制备了微量碳纤维、碳化硅纤维和粘胶基活性碳毡作吸波剂的系列纤维/环氧树脂复合吸波材料。系统研究了碳纤维平行、正交、垂直等不同排布方式对吸波材料吸波性能的影响和碳毡容性、感性电路模拟吸波材料的吸波特性，探讨了它们的吸波机理。在此基础上把垂直排布碳纤维和感性排布碳毡复合混杂，设计制备了碳纤维(毡)/树脂混杂复合材料，用弓形法测试其吸波性能和力学性能。 研究结果表明：微量碳纤维/树脂复合吸波材料中，碳纤维的间距、含量对吸波性能有重要影响。其中碳纤维垂直排布吸波材料的吸波性能优于平行、正交排布方式，它在 12～18GHz 内有较好的反射衰减。碳纤维间距为 4mm,纤维规格为 1k 根/束时最大吸收峰达-20dB,有效频带宽度约为 8GHz。等幅同相天线阵模型和碳纤维垂直排布衍射模型分别可以较好地模拟碳纤维平行排布和垂直排布吸波材料结构。 粘胶基活性碳毡感性排布吸波材料的网格大小和毡条宽度对吸波性能有重要影响，容性吸波材料的碳毡贴片大小及贴片间距对其吸波性能影响显著。该吸波材料在 9～11 GHz 内出现-30dB 以下的最大反射衰减峰。 综合碳纤维垂直排布和粘胶基活性碳纤维毡感性排布在不同频段各有优异吸收，把粘胶基活性炭毡（毡条宽 5mm,间距为 10mm）和碳纤维垂直排布（间距8mm,1k）分块混杂后制备的树脂基吸波材料在 10～18GHz 都有大于-20dB 的反射衰减；碳毡（毡条宽 5mm,间距为 20mm）和垂直排布碳纤维(间距 4mm,1k)穿插排布获得均匀混杂吸波材料在 8~18GHz 内均有-10dB 以下的反射衰减。更多还原

【Abstract】 A series of radar absorbing materials were prepared by using laminating techniques.The absorbing properties of these composites in which carbon fibers were embeddedin parellel, orthogonal or vertical and that carbon fiber felts were arranged incapacitive or perceptual mode were researched systematically. Based on the resultsabove, vertical-arranged carbon fibers and perceptual-arranged carbon fiber felts werehybridized and hybrid composites were prepared. The radar absorbing material (RAM)reflectivity were measured using reflectivity arch measurement and the mechanicswere discussed. For carbon fibers/epoxy resins composites, the reflection loss was influencedsignificantly by carbon fiber’s distance and content. The reflection loss of vertical-arranged composites was better than that of parellel- and orthogonal-arranged ones. Ithad a better reflection property in Ku band than that in X band. A maximum reflectionloss of –20dB and over 8 GHz bandwidth were obtained from the composites inwhich fiber distance was 4 mm and the fiber content was 1k per beam. For carbon fiber felts/epoxy resins composites, the reflection loss of perceptual-arranged the dimension of mesh and the width of carbon felts bar influencedcomposites significantly. The dimension of carbon felts piece and the distancebetween two pieces of carbon felts influenced the reflection loss of capacitive-arranged composites significantly. The composite had a maximum reflection lossbelow –30dB from 9 to 11 GHz. With integrations of merits of vertical-arranged carbon fibers and perceptual-arranged carbon fiber felts, different partitions of the composite were composed ofperceptual-arranged carbon fiber felts bars(width=5mm,diatance=10mm) and vertical-arranged carbon fibers(distance=8mm ,1k per beam ) and the reflection loss band-width was 8 GHz from 10 to 18 GHz below -20dB. A maximum reflection loss of–30dB and over 10GHz bandwidth from 8 to 18 GHz were obtained from thecomposite with Interpenetration of perceptual-arranged carbon fiber felts bars (width=5mm, diatance=20mm) and vertical- arranged carbon fibers(distance=4mm ,1k perbeam ).更多还原