【作者】 韩翠林； 赵东林； 沈曾民；

【Author】 HAN Cui-lin, ZHAO Dong-lin, SHEN Zeng-min (State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029,China)

【机构】 北京化工大学化工资源有效利用国家重点实验室；

【摘要】 用基板法以乙炔为碳源,镍板为催化剂,PCl3为助催化剂,通过化学气相沉积制备螺旋形碳纤维手性吸收剂,反应设备为卧式气相沉积炉。制备的工艺参数为:反应温度650～700℃,氩气流量20～40ml/min,乙炔气流量20～30ml/min,氢气流量50～70ml/min,PCl3流量为0.03～0.05ml/min。对螺旋形碳纤维在2～18GHz的微波电磁特性详细研究后发现,螺旋形碳纤维具有较高的介电损耗,电磁参数随频率的最大有减小的趋势,有利于实现宽频吸波,探讨了螺旋形碳纤维的吸波机理,螺旋形碳纤维是一种非常有发展前景的手性吸收剂和吸波材料。更多还原

【Abstract】 The coiled carbon fiber chiral radar absorbers were obtained by Ni catalyzed pyrolysis of acetylene containing a small amount of PCl3. The production of the coiled carbon fibers in the present research was conducted in a horizontal tubular reactor. The reaction condition used are as follows: reaction temperature 650-700℃, reaction time 1h, hydrogen 50-70ml/min, argon 20-40ml/min, acetylene 20-30ml/min, PCl3, 0.03-0.05ml/min. In order to investigate the microwave absorbing property and mechanism of the coiled carbon fiber chiral radar absorbers, the microwave electromagnetic characteristics of the coiled carbon fibers at the frequency range of 2-18GHz were studied in detail. The dissipation factors of the coiled carbon fibers were high at the microwave frequencies. The microwave permittivity of the composites of the coiled carbon fibers and paraffin wax (or other dielectric materials) could be tailored by the content of the coiled carbon fibers. The real part (ε′) and imaginary part (ε″) of the complex permittivity of the coiled carbon fibers decrease with the frequency increase at 2-18GHz. The coiled carbon fibers are good chiral absorbers and radar absorbing materials.更多还原