Preparation and Microwave Absorbing Properties of Carbon-Encapsulated Iron Carbide Magnetic NanoparticlesReport as inadecuate




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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.

KEYWORDS

carbon-encapsulated; iron carbide; carbonization; radar absorbing materials

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Author: Qing-huai Li, Xiao-lai Liu, Dong-lin Zhao

Source: http://www.scirp.org/



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