KEPCO Journal on Electric Power and Energy

Korea Electric Power Corporation (한국전력공사)
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Study on the Magnetic Shield Effect of Carbon-based Materials at Extremely Low Frequency

탄소계 소재를 이용한 극저주파 영역에서의 자기 차폐효과 연구

  • Oh, Seong Moon (School of Materials and Systems Engineering, Kumoh National Institute of Technology) ;
  • Kang, Dong Su (School of Materials and Systems Engineering, Kumoh National Institute of Technology) ;
  • Lee, Sang Min (School of Materials and Systems Engineering, Kumoh National Institute of Technology) ;
  • Baek, Un Gyeong (School of Materials and Systems Engineering, Kumoh National Institute of Technology) ;
  • Roh, Jae Seung (School of Materials and Systems Engineering, Kumoh National Institute of Technology)
  • Published : 2015.09.30
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Abstract

To examine the magnetic shielding effect for carbon-based materials at extremely low frequencies (60 Hz), two types of carbon black (Super-P and Denka Black) and a natural graphite (HC-198) were mixed into organic binder at 10 wt.% to produce a coating solution, and a powder coating with varying thickness was applied on an aluminum disk measuring 88 mm in radius. A device was developed to measure the sheielding effect at extremely low frequencies. A closed circuit was achieved by connecting a transformer and a resistor. The applied voltage was fixed at 65 V, and the magnetic field was measured to being the range of 4.95~5.10 mG. Depending on the thickness of the coating layer, the magnetic field showed a decreasing trend. The maximum decrease in the magnetic field of 38.3% was measured when natural graphite was coated with specimens averaging $455{\mu}m$. This study confirmed that carbon-based materials enable magnetic shielding at extremely low frequencies, and that the magnetic shielding effect can be enhanced by varying the coating thickness.

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