Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Development of Hybrid Insulating Coating for Fe-based Soft Magnetic Powder

철계 연자성 분말용 하이브리드 절연 코팅막 개발

  • Kim, Jungjoon (School of Materials Science and Engineering, Kookmin University) ;
  • Kim, Sungyeom (School of Materials Science and Engineering, Kookmin University) ;
  • Kim, Youngkyun (Advanced Materials & Processing Center, Institute of Advanced Engineering) ;
  • Jang, Taesuk (Department of Advanced Materials Engineering, Sun Moon University) ;
  • Kim, Hwi-jun (Division of New Materials Engineering, Korea Institute of Industrial Technology) ;
  • Kim, Youngjin (Powder/Ceramic Research Division, Korea Institute of Materials Science) ;
  • Choi, Hyunjoo (School of Materials Science and Engineering, Kookmin University)
  • Received : 2021.06.15
  • Accepted : 2021.06.26
  • Published : 2021.06.28
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Abstract

Iron-based amorphous powder attracts increasing attention because of its excellent soft magnetic properties and low iron loss at high frequencies. The development of an insulating layer on the surface of the amorphous soft magnetic powder is important for minimizing the eddy current loss and enhancing the energy efficiency of high-frequency devices by further increasing the electrical resistivity of the cores. In this study, a hybrid insulating coating layer is investigated to compensate for the limitations of monolithic organic or inorganic coating layers. Fe2O3 nanoparticles are added to the flexible silicon-based epoxy layer to prevent magnetic dilution; in addition TiO2 nanoparticles are added to enhance the mechanical durability of the coating layer. In the hybrid coating layer with optimal composition, the decrease in magnetic permeability and saturation magnetization is suppressed.

Keywords

Acknowledgement

This research was financially supported from the Civil-Military Technology cooperation program (No.18-CM-MA-15) and by the Ministry of Trade, Industry and Energy (MOTIE) and Korea Institute for Advancement of Technology (KIAT) through the International Cooperative R&D program (P0006837).

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