Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
권호 표지

Effects of Magnetic Powder Size on Electromagnetic Wave Absorption Characteristics in FeSiCr Flakes/Polymer Composite Sheets

FeSiCr 박편/폴리머 복합 시트의 전자파 흡수 특성에 미치는 자성분말 입도의 영향

  • Noh, Tae-Hwan (School of Materials Science & Engineering, Andong National University) ;
  • Kim, Ju-Beom (School of Materials Science & Engineering, Andong National University)
  • 노태환 (안동대학교 공과대학 신소재공학부) ;
  • 김주범 (안동대학교 공과대학 신소재공학부)
  • Received : 2007.09.04
  • Published : 2008.01.22
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Abstract

The effects of magnetic powder size 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 composite sheet including small magnetic flakes with the size less than $26{\mu}m$ exhibited high power loss in the GHz frequency range as compared with the sheets having large alloy flakes of $45{\sim}75{\mu}m$. Moreover, both the complex permeability and the loss factor increased with the decrease in size of the alloy flakes. The large power loss of the sheets containing small magnetic flakes was attributed to the high complex permeability, especially their imaginary part. The high complex permeability of the sheets composed of small flakes was considered to be due to the highly thin shape of the flakes inducing low eddy-current loss.

Keywords

Acknowledgement

Supported by : 한국과학재단

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