【作者】 李情怀； 刘晓来； 赵东林；

【Author】 LI Qing-huai~1,LIU Xiao-lai~1,ZHAO Dong-lin~2 (1.Deparment of Physics and Electronic Science,Beijing University of Chemical Technology,Beijing 100029,China; 2.Key Laboratory of Carbon Fiber and Functional Polymer of Ministry of Education,Beijing University of Chemical Technology,Beijing 100029,China)

【机构】 北京化工大学物理与电子科学系； 北京化工大学碳纤维及功能高分子教育部重点实验室；

【摘要】 以热塑性酚醛树脂为碳源,硝酸铁为催化剂和金属源,六次甲基四胺为固化剂和交联剂,通过改进的炭化法制备碳包覆碳化铁纳米磁性粒子,反应设备为高温炭化炉。制备的工艺参数为:固化温度150℃,炭化温度为700℃保留1h,升温速率1.5℃/min,氮气流量20～40mL/min。详细研究了所制备的碳包覆碳化铁纳米磁性粒子在2～18GHz的微波电磁特性,发现样品具有较高的电阻率,在高频范围下具有较高的磁损耗以及自然共振现象的出现,有利于介质的阻抗匹配和电磁波的吸收,探讨了碳包覆碳化铁纳米磁性粒子的吸波机理,表明它是一种在高频电磁波段非常有潜力的微波吸收材料。更多还原

【Abstract】 Carbon-encapsulated iron carbide nanoparticles have been successfully synthesized with pheolic-formaldehyde （PF） resin as carbon source,ferric nitrate（FN） as metal precursors and hexamethylenetetramine as curing agent by a modified carbonization method,the production was conducted in a high-temperature electric furnace.The reaction condition used are as follows:curing temperature 150℃,carbonization temperature 700℃,with a rate of 1.5℃/min,reaction time 1h,nitrogen 20-40mL/min.The microwave electromagnetic characteristics of the carbonized products at the frequency range of 2-18 GHz were studied in detail.The electric resistivity of the sample was high at the microwave frequencies.The occurrence of the natural resonance and the increased magnetic loss in the high-frequency band are significant for impedance matching and electromagnetic wave absorbing.It indicates that the carbon-encapsulated Fe₃C nanoparticles has a potential application in the production of radar absorbing materials.更多还原