Electromagnetic and microwave absorbing properties of raw and milled FeSiCr particles

FeSiCr alloy (Fe: 90%, Si: 7.9%, and Cr: 2.1%) with pre-milled flaky shape was re-milled in a planetary ball-mill for 30 h. The complex permittivity (ε′−jε″) and permeability (μ′−jμ″) are measured by using the transmission/reflection method for two different aspect ratios of flake-shaped FeSiCr/epox...

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Bibliographic Details
Published in:Journal of applied physics 2014-05, Vol.115 (17)
Main Authors: Yang, R. B., Liang, W. F., Chen, C. C., Choi, S. T.
Format: Article
Language:English
Subjects:
Aspect ratio
Ball milling
Chromium
Complex permittivity
Dielectric loss
Electromagnetic radiation
Energy dissipation
Magnetic permeability
Polymer matrix composites
Reflection
Silicon
Wave power
Weight
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Summary:FeSiCr alloy (Fe: 90%, Si: 7.9%, and Cr: 2.1%) with pre-milled flaky shape was re-milled in a planetary ball-mill for 30 h. The complex permittivity (ε′−jε″) and permeability (μ′−jμ″) are measured by using the transmission/reflection method for two different aspect ratios of flake-shaped FeSiCr/epoxy composites for 30%, 40%, and 50% weight ratios. Dielectric loss tangent and magnetic loss tangent of re-milled FeSiCr powder show larger electromagnetic wave energy dissipation than those of the raw flaky FeSiCr powder. For 30 wt. % of FeSiCr/epoxy absorbers with 2 mm thickness, the calculated reflection loss reaches −25 dB at 13.0 GHz for raw flaky powder, −40 dB at 11.4 GHz for the re-milled FeSiCr powder with higher aspect ratios.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4869064