Electromagnetic wave shielding effectiveness of Fe73.5Si13.5B9Nb3Cu1 powder/epoxy composites |
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Authors: | Hyun Bin Kim Joon Pyo Jeun Seong Min Hong Phil Hyun Kang |
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Affiliation: | 1. Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, 1266, Sinjeong-dong, Jeongeup-si, Jeollabuk-do, Republic of Korea;2. Department of Materials Science and Engineering, Chungnam National University, Daejeon, Republic of Korea |
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Abstract: | Magnetic powders composed of Fe73.5Si13.5B9Nb3Cu1 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, Fe73.5Si13.5B9Nb3Cu1 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, the minimum reflection loss was observed near 8 GHz at 2.8 mm thickness. |
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