ADVANCED POWDER TECHNOLOGY
·
2023
·
IF 5.2
Ronglin Zhao,Yaqiang Dong,Shouding Wu,Xubin Li,Zhonghao Liu,Xingjie Jia,Xincai Liu,Hang Wu,Wei Gao,Aina He,Jiawei Li
The insulation coating plays a crucial role in minimizing core loss ( P cv ) in soft magnetic powder cores (SMPCs). In this work, we prepared ZrO 2 coating layer on FeSiBNbCu spherical powder by the hydrolysis-precipitation method and investigated the magnetic properties of the FeSiBNbCu@ZrO 2 nanocrystalline SMPCs. ZrO 2 coating layer were successfully fabricated on the powder by adding a proper amount of K 2 ZrF 6 in alkaline ethyl alcohol solution. The micromorphology and chemical structure of the ZrO 2 coating layer on the surface of FeSiBNbCu nanocrystalline powder, as well as the conversion mechanisms, has been investigated. The presence of the ZrO 2 coating reduces the P cv by significantly lowers eddy loss ( P e ) of the nanocrystalline SMPCs, meanwhile improves DC bias performance and slightly decreases their permeability. When the additive amount of K 2 ZrF 6 is 1.0 wt%, the nanocrystalline SMPCs has best comprehensive soft magnetic properties, including stable effective permeability ( μ e ) of 57.8 up to 1 MHz, excellent DC bias performance of 59.3 % at a bias field of 100 Oe, and the lowest P cv of 194.7 mW/cm 3 at a frequency ( f ) of 150 kHz and maximum magnetic induction ( B m ) of 50 mT.
研究领域:
材料科学
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电气工程
·
纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 3
·192
·
IF 2.8
Ge Shaofan,Yang Yujie,Ding Hongyu,Geng Zhihao,Hu Tan
Magnetic loss is a key factor limiting the application of nanocrystalline soft magnetic composite materials (n-SMCs) in high-frequency environments, and insulative coating and annealing treatment are important methods to reduce magnetic loss. In this study, a nano-La₂O₃ insulative coating was applied to the surface of FeSiBNbCu nanocrystalline magnetic powder via physical grinding combined with ultrasonic vibration. The effects of nano-La₂O₃ coating content (0–1 wt%) and annealing temperature (455–530 ℃) on the soft magnetic properties of the magnetic powder core were systematically investigated. The results showed that the nano-La₂O₃ coating could significantly improve the insulative performance between magnetic powders and effectively reduce the P e of n-SMCs. With the increase of nano-La₂O₃ content, the P e showed a trend of first decreasing and then increasing, reaching the lowest at 0.75 wt%. The P e decreases from 193.43 mW/cm 3 (with 0.0 wt% La₂O₃) to 142.537 mW/cm 3 (with 0.75 wt% La₂O₃ at f = 1 MHz), representing a reduction of 26.3%. Meanwhile, by optimizing the annealing process, the residual internal stress in the magnetic powder core induced during compaction is effectively relieved, leading to a significant decrease in hysteresis loss. As the annealing temperature increases, the hysteresis loss of the magnetic powder core reaches its minimum at 505 °C. When the nano-La₂O₃ content was 0.75 wt% and the annealing temperature was 505 ℃, the prepared nanocrystalline magnetic powder core exhibited optimal soft magnetic properties: a stable effective permeability (22.47) and the lowest total loss (230.4 mW/cm 3 at f = 1 MHz, B m = 20 mT), which was 22.89% lower than that of the untreated sample. This study provides a new process scheme for the development of high-performance low-loss n-SMCs.
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DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2025
·
IF 2
Zhang Ling,Zhao Ronglin,Dong Yaqiang,Jia Xingjie,Zhang Bowei,He Aina,Li Jiawei,Shen Baogen
In the present work, the thermal stability, insulation performance, and magnetic properties of nanocrystalline soft magnetic powder cores (NSMCs) have been greatly improved, thanks to the successful creation of composite materials that combine inorganic nano-Cr 2 O 3 with organic epoxy resins. By coating the nano-Cr 2 O 3 /epoxy insulating layer on the FeSiBNbCu nanocrystalline powders, the core loss ( P cv ) of the FeSiBNbCu NSMCs is successfully decreased and the DC-bias performance is significantly enhanced. When the content of nano-Cr 2 O 3 is 0.3 wt.%, the FeSiBNbCu NSMCs demonstrate optimal comprehensive soft magnetic properties, including low P cv of 106.2 mW/cm 3 at 100 kHz/50 mT, high effective permeability ( μ e ) of 53.6 at the frequency of 1 MHz and DC-bias characteristics of 62% at a bias field of 100 Oe. As the coating layer of the NSMCs, the nano-Cr 2 O 3 /epoxy composite material has a straightforward, practical, and affordable production process. It is also more suited for industrialization and has a wide range of potential industrial applications.
研究领域:
材料科学
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磁性材料
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软磁复合材料
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纳米材料
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电气工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 17
·1348
·
IF 3.2
Ge Shaofan,Yang Yujie,Ding Hongyu,Geng Zhihao,Hu Tan,Tang Ying,Wang Xiyan
This paper employs the citric acid-assisted in-situ oxidation method for surface modification of FeSiBNbCu nanocrystalline powders, systematically investigating the influence mechanism of different citric acid concentrations (0, 10, 30 wt%) on the material’s high-frequency magnetic properties and microwave absorption characteristics. Results show that the FeSiBNbCu nanocrystalline alloy powder oxidized with 10 wt% citric acid has a surface oxide layer with moderate thickness and a uniform interface, which not only effectively blocks inter-particle eddy current paths but also enhances interfacial polarization and dielectric loss capability, achieving synergistic optimization of high-frequency magnetic properties and electromagnetic dissipation characteristics. At 1000 kHz, P e decreased by 32.89% compared to the untreated sample, P h decreased by 17%, and P cv decreased by 24.33% compared to the original powder. μₑ remained stable at approximately 23.3. Microwave absorption performance indicates that this sample achieved a minimum reflection loss of − 38.829 dB at a thickness of 5 mm, with an effective absorption bandwidth of 6.96 GHz. Mechanism analysis indicates that this study provides a feasible process route and theoretical basis for developing soft magnetic composites with both low eddy current loss and multifunctional electromagnetic properties.
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DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Xiao Li,Yaqiang Dong,Liye Xing,Xingjie Jia,Ling Zhang,Wenjun Wang,Aina He,Jiawei Li,Qikui Man,Baogen Shen
In this study, a novel and efficient polyacrylamide insulation coating is chemically prepared on the surface of FeSiBNbCu powder, and the effect of acrylamide content on the soft magnetic properties of the corresponding nanocrystalline soft magnetic powder cores (NPCs) was investigated. At 1.5 wt% of acrylamide, the NPCs shown lowest P cv of 725.16 mW/cm 3 at high frequency (20 mT, 2 MHz), mechanical properties and the direct current (DC) bias performance was significantly improved. Furthermore, the electromagnetic heat generated by the NPCs was simulated using Comsol Multiphysics, and an electromagnetic-thermal coupling model is proposed to simulate the inductive temperature rise. The results demonstrated that the magnetic density and loss maps of the core were significantly reduced after coating, resulting in a maximum temperature reduction of approximately 31 K. These findings suggest that reducing magnetic loss at high frequencies can reduce the temperature rise of the core by preparing a homogeneous and stable polyacrylamide coating with excellent performance on the surface of the magnetic powder.
研究领域:
材料科学
·
电磁学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）