Journal of Industrial and Engineering Chemistry

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Electromagnetic wave shielding effectiveness of $Fe_{73.5}Si_{13.5}B_9Nb_3Cu_1$ powder/epoxy composites

  • Kim, Hyun-Bin (Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute) ;
  • Jeun, Joon-Pyo (Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute) ;
  • Hong, Seong-Min (Department of Materials Science and Engineering, Chungnam National University) ;
  • Kang, Phil-Hyun (Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute)
  • Received : 2009.05.18
  • Accepted : 2009.08.27
  • Published : 2010.05.25
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Abstract

Magnetic powders composed of $Fe_{73.5}Si_{13.5}B_9Nb_3Cu_1$ were prepared using a ball milling technique, and selected powders were annealed at 823 K in a vacuum. Scanning electron microscopy observations determined the shapes of the powders to be of a flake type. To test the electromagnetic wave absorption properties, $Fe_{73.5}Si_{13.5}B_9Nb_3Cu_1$ and epoxy composites were fabricated using an electron beam curing technique with powder/epoxy ratios of 20/80, 30/70, 40/60, and 50/50 by weight. The complex permeability and permittivity of the composites were measured using a network analyzer (0.5-8 GHz), and were used to calculate the refection losses as a function of the composite thickness and frequency. The band width of a reflection loss below -20 dB was 700 MHz from 4.23 GHz to 4.93 GHz at 3.8 mm thickness, attributed to the composite containing 50 wt% of powder. For the composite containing 50 wt% of annealed powder, theminimum reflection loss was observed near 8 GHz at 2.8 mm thickness.

Keywords

Acknowledgement

Grant : Nuclear R&D program

Supported by : Korea Science and Engineering Foundation

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