High-frequency magnetic characteristics and operating thermal stability of industrialized Fe76Si13B8Nb2Cu1 nanocrystalline alloy

Increasing the saturation magnetic induction (B_s) while maintaining excellent high-frequency magnetic characteristics of nanocrystalline alloys is still a challenge. Herein, Fe₇₆Si₁₃B₈Nb₂Cu₁ alloy ribbons with completely amorphous precursor were industrially prepared with industrial raw materials. This industrialized nanocrystalline alloy with B_s of 1.39 T has a low core loss of 179 kW/m³ at 0.2 T and 100 kHz, which is slightly higher than that of the commercially applied Fe_73.5Si_13.5B₉Nb₃Cu₁ alloy with low B_s of ∼ 1.24 T but lower than that of other current alloys. Besides, the real part of complex permeability (μ') of the alloy reaches 24,500 at 100 kHz under an applied filed of 0.06 A/m, which is comparable to that of Fe_73.5Si_13.5B₉Nb₃Cu₁ alloys. Furthermore, the μ' in the operating temperature of 130 °C increase below 9% at 100 kHz and 2% at 200 kHz with respect to μ' at room temperature. Hence, the industrialized alloy with good castability, high-frequency magnetic performance and operating thermal stability has a good application prospect in high-frequency power electronics.