带材厚度对Fe75.2Si13B8Cu1Nb2.8纳米晶软磁合金磁畴结构和高频磁性能的影响

doi:10.11900/0412.1961.2024.00400

金属学报

2026, Vol. 62

Issue (6): 1128-1136 DOI: 10.11900/0412.1961.2024.00400

研究论文

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带材厚度对Fe_75.2Si₁₃B₈Cu₁Nb_2.8纳米晶软磁合金磁畴结构和高频磁性能的影响

施博文¹, 李艳辉¹(

), 冯拓¹, 王雨², 蒋丽¹, 于凤云¹, 杨陆², 张伟¹^,³(

)

1 大连理工大学材料科学与工程学院大连 116024
2 西南应用磁学研究所四川省磁性材料工程技术研究中心绵阳 621000
3 东北大学冶金学院沈阳 110819

Effect of Ribbon Thickness on Magnetic Domain Structures and High-Frequency Magnetic Properties of Fe_75.2Si₁₃B₈Cu₁Nb_2.8 Nanocrystalline Soft Magnetic Alloy

SHI Bowen¹, LI Yanhui¹(

), FENG Tuo¹, WANG Yu², JIANG Li¹, YU Fengyun¹, YANG Lu², ZHANG Wei¹^,³(

)

1 School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
2 Sichuan Engineering Research Center for Magnetic Materials, Southwest Institute of Applied Magnetics, Mianyang 621000, China
3 School of Metallurgy, Northeastern University, Shenyang 110819, China

引用本文:

施博文, 李艳辉, 冯拓, 王雨, 蒋丽, 于凤云, 杨陆, 张伟. 带材厚度对Fe_75.2Si₁₃B₈Cu₁Nb_2.8纳米晶软磁合金磁畴结构和高频磁性能的影响[J]. 金属学报, 2026, 62(6): 1128-1136.
Bowen SHI, Yanhui LI, Tuo FENG, Yu WANG, Li JIANG, Fengyun YU, Lu YANG, Wei ZHANG. Effect of Ribbon Thickness on Magnetic Domain Structures and High-Frequency Magnetic Properties of Fe_75.2Si₁₃B₈Cu₁Nb_2.8 Nanocrystalline Soft Magnetic Alloy[J]. Acta Metall Sin, 2026, 62(6): 1128-1136.

全文: PDF(2639 KB) HTML

摘要:

为提高纳米晶软磁合金的高频磁性能，本工作研究了带材厚度(15~23 μm)对Fe_75.2Si₁₃B₈Cu₁Nb_2.8纳米晶软磁合金的组织结构及静态和高频磁性能的影响规律，并通过磁畴结构表征分析了带材厚度对其高频磁化行为的影响机制。结果表明，不同厚度的快淬合金带材均呈现非晶态，843 K退火60 min后，形成相似的非晶+ α-Fe纳米晶双相组织，α-Fe的平均晶粒尺寸为11.0~11.6 nm。所有纳米晶合金带材的饱和磁通密度和矫顽力无明显差异，分别为1.35~1.36 T和0.5~0.6 A/m。纳米晶合金的高频软磁性能随带材厚度的减小而逐渐提升，薄带材的有效磁导率(μ_e)可在更高频率下保持稳定，且随频率增加的衰减较慢。15 μm厚度带材在100 kHz和1 MHz下的μ_e分别为17000和5200，远高于23 μm厚带材的14000和2900。减小带材厚度能显著降低单位质量铁心损耗(P_cm)，在0.2 T、100 kHz和0.2 T、500 kHz条件下，15 μm厚带材的P_cm分别为67和811 W/kg，较23 μm厚带材分别降低38.0%和41.9%。损耗分离结果表明，薄带材较低的P_cm主要归因于涡流损耗和剩余损耗的降低。减小带材厚度可细化纳米晶合金的磁畴，有助于高频下磁畴旋转，从而提高高频磁导率、降低剩余损耗。

关键词 ：纳米晶软磁合金, 高频损耗, 磁导率, 带材厚度, 磁畴结构

Abstract：

The development of third-generation semiconductors has increased power density in electronic devices while increasing demands for high-frequency performance of internal soft magnetic materials. Fe-based nanocrystalline alloys are among the most promising candidates for high-frequency applications owing to their excellent comprehensive soft magnetic properties, including high saturation magnetic flux density (B_s), high permeability, and low core loss per unit mass (P_cm). However, further improvements in their high-frequency properties are required. This study prepared Fe_75.2Si₁₃B₈Cu₁Nb_2.8 nanocrystalline alloy ribbons with 15-23 μm thicknesses by adjusting the Cu wheel speed. The effects of ribbon thickness on the structure and static/high-frequency magnetic properties of the nanocrystalline alloys were investigated. Furthermore, the high-frequency magnetization mechanisms of nanocrystalline alloys with varying ribbon thicknesses were examined through magnetic domain structure characterization. Results indicate that all as-spun alloy ribbons exhibit an amorphous structure and transform into a similar amorphous + α-Fe nanocrystalline dual-phase structure after annealing at 843 K for 60 min, with average α-Fe grain sizes of 11.0-11.6 nm. The static magnetic properties of all ribbons are nearly identical, with B_s and coercivities of 1.35-1.36 T and 0.5-0.6 A/m, respectively. On the contrary, the high-frequency soft magnetic properties improve with decreasing ribbon thickness. The effective permeability (μ_e) of thinner ribbons remains stable and exhibits milder attenuation with increasing frequency. At 100 kHz and 1 MHz, the 15-μm ribbon has μ_e of 17000 and 5200, respectively, which are substantially higher than the values of 14000 and 2900 for the 23-μm ribbon. Moreover, the thinner ribbons demonstrate reduced P_cm. At 0.2 T, 100 kHz and 0.2 T, 500 kHz, the 15-μm ribbon shows P_cm of 67 and 811 W/kg, representing reductions of 38.0% and 41.9%, respectively, compared with the 23-μm ribbon. Loss separation analysis indicates that the reduced P_cm of the thin ribbon is primarily attributed to decreased eddy current loss and residual loss. The decreased ribbon thickness refines the magnetic domains, facilitating domain rotation at high frequencies and improving high-frequency permeability while reducing residual loss.

Key words： nanocrystalline soft magnetic alloy high-frequency core loss permeability ribbon thickness magnetic domain structure

收稿日期: 2024-11-28

ZTFLH:

TG132.2

基金资助:国家重点研发计划项目(2022YFB3804100);国家自然科学基金项目(52171153);国家自然科学基金项目(52371149)

通讯作者: 李艳辉，yhli@dlut.edu.cn，主要从事非晶/纳米晶软磁合金和纳米多孔合金等功能材料研究；
张伟，wzhang@dlut.edu.cn，主要从事非晶态合金、纳米材料和磁性材料研究

Corresponding author: LI Yanhui, associate professor, Tel: (0411)84706400, E-mail: yhli@dlut.edu.cn;
ZHANG Wei, professor, Tel: (0411)84706063, E-mail: wzhang@dlut.edu.cn

作者简介: 施博文，男，2000年生，硕士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2024.00400 或 https://www.ams.org.cn/CN/Y2026/V62/I6/1128

图1 不同厚度Fe75.2Si13B8Cu1Nb2.8快淬合金带材的XRD谱和差式扫描量热(DSC)曲线

图2 厚度为23 µm的Fe75.2Si13B8Cu1Nb2.8快淬合金带材的TEM明场像、HRTEM像和选区电子衍射(SAED)花样

图3 不同厚度Fe75.2Si13B8Cu1Nb2.8合金带材的磁通密度(Bs)和矫顽力(Hc)与退火温度(Ta)的关系

表1 不同厚度Fe75.2Si13B8Cu1Nb2.8纳米晶带材的α-Fe平均晶粒尺寸和磁性能参数

图4 843 K退火60 min后不同厚度Fe75.2Si13B8Cu1Nb2.8合金带材的有效磁导率(μe)和单位质量铁心损耗(Pcm)与频率的关系

图5 843 K退火60 min后不同厚度Fe75.2Si13B8Cu1Nb2.8合金带材的XRD谱和TEM分析

图6 厚度为19 μm的Fe75.2Si13B8Cu1Nb2.8纳米晶带材的磁滞损耗(Ph)、涡流损耗(Pec)和剩余损耗(Pex)及各损耗占比(P / Pt)与频率的关系

图7 不同厚度Fe75.2Si13B8Cu1Nb2.8纳米晶带材的Pec和Pex与频率的关系

图8 不同厚度Fe75.2Si13B8Cu1Nb2.8纳米晶带材磁畴随变化磁场的演变

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