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Author(s): |
Qing-huai Li, Deparment of Physics and Electronic science, Beijing University of Chemical Technology, Beijing 100029, China;
Xiao-lai Liu, Deparment of Physics and Electronic science, Beijing University of Chemical Technology, Beijing 100029, China;
Dong-lin Zhao, Key Laboratory of carbon fiber and functional polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing |
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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 20-40 ml/min. The microwave absorbing properties of the carbon-encapsulated iron carbide magnetic nanoparti-cles at the frequency range of 2-18 GHz were investigated. 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 have a potential application in the production of radar absorbing materials.
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