[T16] Soft Magnetic Materials

[15E-T16-15] High-Frequency Magnetic Properties of Compacted Fe–Mn–Ni Powder Coated with Phosphates Containing Various Metals

*R. Okazaki¹, S. Abe¹, J. Nishitsuji¹, J. Akamatsu¹, N. Imaoka¹, M. Kume¹, Y. Kawakami², A. Matsumoto², K. Ozaki² (1.NICHIA CORPORATION, Japan, 2.National Institute of Advanced Industrial Science and Technology, Japan)

Keywords:soft magnetic powder, iron-based alloy, magnetic powder core, insulator, phosphate

Our Fe-Mn-Ni soft magnetic powders have the potential to be applied to axial-gap motor stators and high-frequency transformer cores owing to their low coercivity and saturation magnetization equivalent or higher than that of pure iron. Our group has developed a novel phosphate layer technology with improved heat resistance for iron-based alloy powders. In this paper, we will describe the high-frequency properties and structure of phosphate insulating layer containing various metallic elements (Na, Mg, Al, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Zr, Mo, Ba, Hf, Ta, La, Ce, Nd, Sm, and Dy) coated on Fe-Mn-Ni alloy powders. The addition of several metals improves the high-frequency characteristics, resulting in an iron loss of 28.5 W/kg at 1 T and 400 Hz owing to the combination of rare-earth elements and transition metals.