Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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The Characteristic Changes of Electromagnetic Wave Absorption in Fe-based Nanocrystalline P/M Sheets Mixed with Ball-Milled Carbon Nanotubes

Fe계 나노결정립 분말 시트에 첨가된 CNT의 볼밀 공정에 따른 전자파 흡수 특성 변화

  • Kim, Sun-I (Department of Nano System Engineering, Inje University) ;
  • Kim, Mi-Rae (Department of Nano System Engineering, Inje University) ;
  • Sohn, Keun-Yong (Department of Nano System Engineering, Inje University) ;
  • Park, Won-Wook (Department of Nano System Engineering, Inje University)
  • 김선이 (인제대학교 나노시스템 공학과) ;
  • 김미래 (인제대학교 나노시스템 공학과) ;
  • 손근용 (인제대학교 나노시스템 공학과) ;
  • 박원욱 (인제대학교 나노시스템 공학과)
  • Published : 2009.12.28
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Abstract

Electromagnetic wave energies are consumed in the form of thermal energy, which is mainly caused by magnetic loss, dielectric loss and conductive loss. In this study, CNT was added to the nanocrystalline soft magnetic materials inducing a high magnetic loss, in order to improve the dielectric loss of the EM wave absorption sheet. Generally, the aspect ratio and the dispersion state of CNT can be changed by the pre-ball milling process, which affects the absorbing properties. After the various ball-milling processes, 1wt% of CNTs were mixed with the nanocrystalline $Fe_{73}Si_{16}B_7Nb_{3}Cu_1$ base powder, and then further processed to make EM absorption sheets. As a result, the addition of CNT to Fe-based nanocrystalline materials improved the absorption properties. However, the increase of ball-milling time for more than 1h was not desirable for the powder mixture, because the ballmilling caused the shortening of CNT length and the agglomeration of the CNT flakes.

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References

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