Electromagnetic Characteristics of Novel FeNbBPSi Nanocrystalline Alloy Powder with High B_s of 1.4 T

Abstract

In this study, the effect of B, P, and Si content on the amorphous forming ability (AFA), B_s, and H_c was investigated in Fe_78.7Nb₆(B_15-x-yP_xSi_y)₁₅Cr_0.3 (2.0 ≦ x ≦ 4.5, 2.0 ≦ y ≦ 4.5) alloys using metallic ribbons produced by a single-roller melt-spinning method. The Fe_78.7Nb₆B₉P₃Si₃Cr_0.3 alloy with a high AFA of 69 μm exhibited excellent magnetic characteristics, B_s of 1.42 T and H_c of 9.3 A/m.

Precursor Fe_78.7Nb₆B₉P₃Si₃Cr_0.3 amorphous alloy powder was prepared by the gas atomization method using high pressure water for rapid quenching. The as-atomized particle as a with a single amorphous phase was observed from a cross sectional image and SAED pattern in the Fe_78.7Nb₆B₉P₃Si₃Cr_0.3 alloy powder. In addition, the Fe_78.7Nb₆B₉P₃Si₃Cr_0.3 alloy powder after nanocrystallization at 873 K achieved both high B_s of 1.40 T and low H_c of 55 A/m compared to commercial amorphous, and nanocrystalline alloys. Furthermore, the Fe_78.7Nb₆B₉P₃Si₃Cr_0.3 nanocrystalline alloy powder core exhibited superior DC-bias electromagnetic characteristics compared with commercial amorphous or nanocrystalline alloy powder core. The newly developed Fe_78.7Nb₆B₉P₃Si₃Cr_0.3 alloy powder with excellent magnetic softness is suitable for improving the performance of inductor using magnetic components.