沥青基中空碳纤维的制备及其吸波性能

Preparation and electromagnetic performance of mesophase pitch based hollow carbon fiber

以中间相沥青为原料,采用氮压式纺丝机制备了不同炭化温度的中空截面沥青基碳纤维,通过SEM表征了其断面形貌,利用矢量网络分析仪研究了炭化温度对中空碳纤维电磁损耗性能的影响。结果显示,最佳的炭化温度为900℃时,中空碳纤维具有最大电磁损耗;研究了铺层方式对复合材料吸波性能影响,利用弓形法对复合材料的反射率进行了测试,结果显示,碳纤维交叉铺层时,吸波合格带宽为10GHz,最大吸收峰在25dB。

Hollow carbon fiber was prepared from mesophase pitch by spining and carbonization at different temperatures. The cross section of the as-prepared hollow carbon fiber was observed by SEM. Effect of carbonization temperature on the electromagnetic performance of the hollow carbon fiber was studied by a bow testing system. The hollow carbon fiber carbonized at 900℃ has the largest electromagnetic energy loss. Effect of the laminate packing ways on the electromagnetic performance of composites was also investigated by the bow testing system. The eligible bandwith of composite is 10GHz and the maximum radar absorption is -25 dB when the carbon fibers are across packed.