Electromagnetic wave absorption properties of Fe73Si16B7Nb3Cu1-based composites mixed with fine charcoal powder

Fe73Si16B7Nb3Cu1 soft magnetic powder was crystallized to obtain a nano grain structure and mixed with a fine charcoal powder. The mixtures were tape-cast with polymer-based organic binders to form a sheet-type electromagnetic (EM) wave absorption composite. The EM wave absorption properties of the sheets were investigated using a network analyzer. The results showed that addition of charcoal powder improved the EM-absorbing properties of the composite. The power loss of the EM wave was directly related to the imaginary part of the permeability and permittivity, and it was reviewed in detail. Excellent absorption properties were achieved by adding 5 wt % charcoal powder (−500 mesh) to the Fe-based sheets.

[1]  K. Sohn,et al.  Electromagnetic wave absorbing properties of Fe73Si16B7Nb3Cu1 base P/M sheets mixed with dielectric fine particles , 2008 .

[2]  K. Sohn,et al.  The control of nano-grain size and magnetic properties of Fe73Si16B7Nb3Cu1 soft magnetic powder cores , 2007 .

[3]  Wei Pan,et al.  Electrical conductivity and dielectric properties of multiwalled carbon nanotube and alumina composites , 2006 .

[4]  A. U. Ubale,et al.  Thermally stimulated discharge conductivity in polymer composite thin films , 2006 .

[5]  Anna A. Barba,et al.  Carbon black/silicone rubber blends as absorbing materials to reduce Electro Magnetic Interferences (EMI) , 2006 .

[6]  Jiurong Liu,et al.  Frequency dispersion of complex permeability and permittivity on iron-based nanocomposites derived from rare earth-iron intermetallic compounds , 2006 .

[7]  Z. Dang,et al.  Carbon nanotube composites with high dielectric constant at low percolation threshold , 2005 .

[8]  Jiurong Liu,et al.  Electromagnetic wave absorption properties of Fe1−xCox/Y2O3 (x = 0.33, 0.5, 0.67) nanocomposites in gigahertz range , 2005 .

[9]  D. Chung.  Electromagnetic interference shielding effectiveness of carbon materials , 2001 .

[10]  Kwang Yun Cho,et al.  Dielectric properties of epoxy-dielectrics-carbon black composite for phantom materials at radio frequencies , 2000 .

[11]  Shigehisa Ishihara,et al.  Wood Charcoal as Functional Carbon Materials. , 1999 .

[12]  P. Hourquebie,et al.  Microwave properties of conductive polymers , 1994 .

[13]  G. Herzer,et al.  Grain structure and magnetism of nanocrystalline ferromagnets , 1989, International Magnetics Conference.

[14]  K. T. Chung,et al.  Electrical permittivity and conductivity of carbon black‐polyvinyl chloride composites , 1982 .

[15]  Richard B. Schulz,et al.  Low-Frequency Shielding Resonance , 1968 .