Electromagnetic Wave Absorbing Property of Composite Fe3O4-graphite Prepared by In-situ Chemical Precipitation
LI Xue-ai1,2, WANG Chun-sheng2, HAN Xi-jiang2
1. State Key Laboratory of Hydropower Equipment, Harbin Electric Machinery Company Limited, Harbin 150040, China;
2. Harbin Institute of Technology, Harbin 150001, China
Abstract：The Fe3O4 and graphite composites are prepared by in-situ chemical precipitation. The effect of mass ratio of Fe3O4 to graphite on electromagnetic wave absorbing property of the composites was investigated. The results show that the intensity of Fe3O4 XRD increases with the increase of the adding amount of Fe3O4 in composites. The Fe3O4 nanoparticles mainly deposit on the surface of graphite particles. The Fe3O4 nanoparticles coat the graphite surface completely with the increase of the adding amount of Fe3O4 in composite and some Fe3O4 nanoparticles disperse between graphite particles. The dielectric constant of composites decreases with the increase of Fe3O4 amount in composites. The magnetic permeability is less affected by the amount of Fe3O4 in composite. The Fe3O4-graphite composites with mass ratio of 5:1 and 4:1 show better absorbing property than that of other samples. The sample of 5:1 shows maximum absorption value of -31.9dB and the frequency bandwidth of reflection loss over -10dB about 5.0GHz at the thickness of 1.5mm.
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LI Xue-ai, WANG Chun-sheng, HAN Xi-jiang. Electromagnetic Wave Absorbing Property of Composite Fe3O4-graphite Prepared by In-situ Chemical Precipitation. Journal of Materials Engineering, 2015, 43(5): 44-49.
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2015, Vol. 43 
