Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Effects of Magnetic Powder Thickness on Electromagnetic Wave Absorption Characteristics in FeSiCr Flakes/Polymer Composite Sheets

FeSiCr 박편/폴리머 복합시트의 전자파 흡수 특성에 미치는 자성분말 두께의 영향

  • Kim, Ju-Beom (School of Materials Science & Engineering, The Center for Green Materials Technology, Andong National University) ;
  • Noh, Tae-Hwan (School of Materials Science & Engineering, The Center for Green Materials Technology, Andong National University)
  • 김주범 (안동대학교 공과대학 신소재공학부, 청정소재기술연구센터) ;
  • 노태환 (안동대학교 공과대학 신소재공학부, 청정소재기술연구센터)
  • Received : 2009.07.09
  • Published : 2009.12.20
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Abstract

The effects of magnetic powder thickness on electromagnetic wave absorption characteristics in Fe-6.5Si-0.9Cr (wt%) alloy flakes/polymer composite sheets available for quasi-microwave band have been investigated. The atomized FeSiCr powders were milled by using attritor for 12, 24, and 36 h, powder thickness changed from $40{\mu}m$ to $3{\mu}m$ upon 36 h milling. The composite sheet, including thinned magnetic flakes, exhibited higher power loss in the GHz frequency range as compared with the sheets having thick flakes. Moreover, both the complex permeability and the loss factor increased with the decrease in thickness of the alloy flakes. Therefore, the enhanced power loss property of the sheets containing thin alloy flakes was attributed to the flakes of high complex permeability, especially their imaginary part. Additionally, the complex permittivity was also increased with the reduction of flake thickness, and this behavior was considered to be helpful for improvement of the electromagnetic wave absorption characteristics in the composite sheets, including thin alloy flakes.

Keywords

Acknowledgement

Supported by : 한국과학재단

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