Reduction of High-Frequency Core Loss of a Fe77.2Si11B8.5Cu0.8Nb2.5 Soft Magnetic Nanocrystalline Alloy by Minor Alloying

IF 2.9 2区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Acta Metallurgica Sinica-English Letters Pub Date : 2024-07-10 DOI:10.1007/s40195-024-01729-6

Shushen Guo, Yanhui Li, Yibing Zhang, Lu Yang, Wei Zhang

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Abstract

Enhancing saturation magnetic flux density (B_s) while reducing high-frequency core loss in Finemet-type nanocrystalline alloys is of great significance in achieving the miniaturization, high-frequency, and energy-saving of modern power electronic devices. In this work, we first designed a high-B_s Fe_77.2Si₁₁B_8.5Cu_0.8Nb_2.5 alloy by appropriately reducing the non-magnetic elements in typical Finemet nanocrystalline alloys, and subsequently alloyed 2 at% Co, Al, and Mo, respectively. The effects of alloying elements on structure and static and high-frequency magnetic properties were studied. The results reveal that, alloying Al or Mo reduces the average α-Fe grain size (D_α-Fe) in the nanocrystalline alloys, while Co exhibits a slight influence. The added Al or Mo results in decreases in both the B_s and coercivity (H_c) of the nanocrystalline alloys, whereas Co increases the B_s without changing H_c, and meanwhile, all alloying elements show minimal effects on effective permeability (μ_e). Furthermore, the addition of Co, Al, or Mo lowers the core loss (P_cv) at 0.2 T/100 kHz of the based nanocrystalline alloy with reductions of 10.9%, 29.6%, and 26.8%, respectively. A Fe_75.2Si₁₁B_8.5Cu_0.8Nb_2.5Al₂ nanocrystalline alloy exhibits outstanding soft magnetic properties with B_s, H_c, μ_e at 10 kHz and 100 kHz, and P_cv at 0.2 T/100 kHz of 1.34 T, 0.8 A/m, 27,400, 18,000, and 350 kW/m³, respectively. The reduction in P_cv is primarily attributed to the decreased eddy current losses, originating from the increased electrical resistivity by elements alloying.

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通过少量合金化降低 Fe77.2Si11B8.5Cu0.8Nb2.5 软磁纳米晶合金的高频磁芯损耗

提高饱和磁通密度（Bs），同时降低 Finemet 型纳米晶合金的高频磁芯损耗，对于实现现代电力电子设备的小型化、高频化和节能化具有重要意义。在这项工作中，我们首先通过适当减少典型 Finemet 纳米晶合金中的非磁性元素，设计出了一种高铍 Fe77.2Si11B8.5Cu0.8Nb2.5 合金，随后分别合金化了 2% 的 Co、Al 和 Mo。研究了合金元素对结构以及静态和高频磁性能的影响。结果表明，合金化 Al 或 Mo 会减小纳米晶合金中平均 α-Fe 晶粒大小（Dα-Fe），而 Co 的影响较小。添加 Al 或 Mo 会导致纳米晶合金的 Bs 和矫顽力（Hc）降低，而 Co 会增加 Bs，但不会改变 Hc，同时，所有合金元素对有效渗透率（μe）的影响都很小。此外，添加 Co、Al 或 Mo 可降低纳米晶合金在 0.2 T/100 kHz 时的磁芯损耗（Pcv），分别降低 10.9%、29.6% 和 26.8%。Fe75.2Si11B8.5Cu0.8Nb2.5Al2纳米晶合金具有出色的软磁特性，在 10 kHz 和 100 kHz 时的 Bs、Hc、μe 以及 0.2 T/100 kHz 时的 Pcv 分别为 1.34 T、0.8 A/m、27,400、18,000 和 350 kW/m3。Pcv 值降低的主要原因是元素合金化增加了电阻率，从而减少了涡流损耗。

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来源期刊

Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

6.60

自引率

14.30%

发文量

122

审稿时长

2 months

期刊介绍： This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.