Fabrication of FePBNbCr Glassy Cores With Good Soft Magnetic Properties by Hot Pressing

Glassy Fe₇₇P₇B₁₃Nb₂Cr₁ alloy powders with the particle size below 100 μm were synthesized by water atomization using industrial raw materials. The glassy powders were consolidated into bulk forms through sintering them at different temperatures by hot pressing. The resulting glassy core sintered at 771 K, which between the supercooled liquid region, has a high relative density of 91% compared with the master alloy. It also exhibits good soft magnetic properties, i.e., high saturation magnetic flux density B_s of 1.13 T, low coercive force H_c of 50 A/m, relatively high effective permeability μ_e of 1200 at 1 kHz under a field of 1 A/m, low core loss P of 1393 mW/cm³ at 50 kHz under the maximum magnetic flux density of 0.1 T. The synthesis of Fe-based glassy cores with good soft magnetic properties is encouraging for future applications as functional materials.