Magnetic properties and loss separation mechanism of FeSi soft magnetic composites with in situ NiZn-ferrite coating

Wang, Jinghui; Xue, Zhengliang; Song, Songqiang; Sun, Haibo

doi:10.1007/s10854-021-06551-9

Cited by 14 publications

(4 citation statements)

References 37 publications

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“…One of the most important parameters is the volume fraction of the insulator. 7−10 Many research works focus on this issue using as a material ferromagnetic powders mixed with various insulators, for example, ferrites 11,12 and oxides. 13 It was shown that often even a slight change in the amount of insulator in an SMC while keeping the rest of the parameters unchanged leads to a significant difference in functional magnetic properties.…”

Section: ■ Introductionmentioning

confidence: 99%

“…One of the most important parameters is the volume fraction of the insulator. − Many research works focus on this issue using as a material ferromagnetic powders mixed with various insulators, for example, ferrites , and oxides. , …”

Section: Introductionmentioning

confidence: 99%

“…The volume content of the insulator (secondary component), the spatial distribution of the secondary component, open–closed and total porosity, structure defects, local fluctuations of the chemical composition, long- and short-distance arrangement of the structure, and other parameters have different influences on the formation of magnetic properties. The study and quantification of the microstructure and correlations with electromagnetic properties is the subject of ongoing research of SMC. ,− It should be noted that in experimental works to study the effect of the amount of insulator on the structure and properties of SMCs, a traditional set of research techniques typical for such objects is usually used (analysis of the frequency dependence of complex magnetic permeability, measurement of losses and electrical resistivity, VSM, XRD, various types of microscopy, FTIR, XPS). ,− In addition, samples are usually studied in which the insulator content varies in large increments, about 0.5 wt %. For these reasons and because there is insufficient research on this topic, to date, a complete understanding of structure–properties correlations in SMCs is still lacking.…”

Section: Introductionmentioning

confidence: 99%

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Formation of Effective Non-ferromagnetic Barrier in Fe/MgO Soft Magnetic Composite

Bures,

Neslusan,

Faberova

et al. 2024

ACS Appl. Electron. Mater.

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Soft magnetic ferromagnetic/insulator composites are complex objects in terms of structure and magnetic properties. They depend on many different parameters, among which one of the main ones is the amount of insulator. In this work, the effect of MgO content on magnetization processes in Fe/MgO composites is studied in detail by using a wide combination of properties and structure analysis methods. Several series of samples with content steps up to 0.1 wt % were prepared using standard powder metallurgy operations such as dry mixing, cold pressing, and sintering. The study demonstrates that the evolution of Barkhausen noise with increasing MgO content is not systematic. The second phase acts as an effective barrier to magnetic interaction between neighboring Fe particles only after reaching a certain point, which was found to be about 0.9% wt. Some other properties (coercivity, permeability, elastic properties) also demonstrate nontrivial composition dependence. To reveal the causes of the observed phenomena, the structure of the composites was studied in detail, and it was shown that with an increase in the MgO content in the range of 0.8−1%, a change in the mechanisms of structure formation occurs, which, in turn, affects the properties. The presented results provide insights into developing advanced soft magnetic composites with an optimal combination of a ferromagnetic powder and an insulator.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Formation of Effective Non-ferromagnetic Barrier in Fe/MgO Soft Magnetic Composite

Bures,

Neslusan,

Faberova

et al. 2024

ACS Appl. Electron. Mater.

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“…How to minimize the eddy current loss between magnetic powder cores and ensure the pressing effect of composite magnetic powder cores has always been a research hotspot. In recent years, some scholars have deposited inorganic insulation layers such as SiO 2 , TiO 2 , and Al 2 O 3 [ 4 , 5 , 6 , 7 , 8 , 9 ] on the surfaces of magnetic powders by the sol–gel method and prepared ferrite insulation layers such as MnZn and NiZn [ 10 , 11 , 12 , 13 ] by the coprecipitation method to obtain SMPCs with excellent comprehensive performance. However, these two methods have many drawbacks, such as a complex coating process, high production cost, and unstable insulation properties.…”

Section: Introductionmentioning

confidence: 99%

Study of the Soft Magnetic Properties of FeSiAl Magnetic Powder Cores by Compounding with Different Content of Epoxy Resin

Zhu

Liu

Zhao³

et al. 2023

Materials

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FeSiAl is a commonly used soft magnetic material because of its high resistivity, low core loss, and low cost. In order to systematically study the effect of epoxy resin (EP) on the insulated coating and pressing effect of FeSiAl magnetic powders, six groups of composite powders and their corresponding soft magnetic powder cores (SMPCs) were prepared by changing the content of EP, and the soft magnetic properties of the powders and SMPCs were characterized. The results showed that FeSiAl powders exhibited good sphericity and morphology. The Ms of FeSiAl/EP composite powders was between 117.4–124.8 emu·g−1 after adding (0.3, 0.5, 0.7, 1, 1.5, and 2 wt. %) EP. The permeability μe of SMPCs increased first and then decreased with the increase in EP content. Among them, when the EP content was 1 wt. %, the corresponding SMPCs had the highest μe and excellent DC bias performance (63%, 100 Oe). In the whole test frequency range (50~1000 kHz), SMPCs with 1 wt. % EP content had the lowest core loss (1733.9 mW·cm−3 at 20 mT and 1000 kHz). After that, the loss separation study in the low-frequency range (50~250 kHz) was conducted, and the hysteresis loss and eddy current loss of SMPCs with 1 wt. % EP content were also the lowest. In addition, SMPCs also exhibited the best overall performance when the EP content was 1 wt. %. The results of this study can guide the design of composite insulation coating schemes and promote the development of soft magnetic materials for medium and high frequency applications.

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Dependence of Core Loss on Magnetization State Under DC Bias Field for Soft Magnetic Composites Based on FeSiAl/FeSi Powders

Mei,

Xu,

Zhang

et al. 2023

J Supercond Nov Magn

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Magnetic properties and loss separation mechanism of FeSi soft magnetic composites with in situ NiZn-ferrite coating

Cited by 14 publications

References 37 publications

Formation of Effective Non-ferromagnetic Barrier in Fe/MgO Soft Magnetic Composite

Formation of Effective Non-ferromagnetic Barrier in Fe/MgO Soft Magnetic Composite

Study of the Soft Magnetic Properties of FeSiAl Magnetic Powder Cores by Compounding with Different Content of Epoxy Resin

Dependence of Core Loss on Magnetization State Under DC Bias Field for Soft Magnetic Composites Based on FeSiAl/FeSi Powders

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