Preparation and magnetic performance optimization of FeSiAl/Al2O3–MnO–Al2O3 soft magnetic composites with particle size adjustment

Luo, Zigui; Feng, Bo; Chen, Dingya; Yang, Zhenjia; Jiang, Shangwei; Wang, Jian; Wu, Zhaoyang; Li, Guangqiang; Li, Yawei; Fan, Xiaoliang

doi:10.1007/s10854-021-07355-7

Cited by 16 publications

(4 citation statements)

References 31 publications

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“…Iron-based soft magnetic composites (SMCs), which are characterized by high saturation magnetization, high permeability, and low core losses, are the key components of high-frequency electromagnetic systems [1,2]. With the development of frequency control technology, the further reduction in losses in the energy conversion of iron-based SMCs is the key to achieving the miniaturization and efficient application of high-frequency devices [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Various Metal Oxide Insulating Layers on the Magnetic Properties of Fe-Si-Cr Systems

Huang

et al. 2023

Coatings

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Iron-based soft magnetic composites (SMCs) are the key components of high-frequency electromagnetic systems. Selecting a suitable insulating oxide layer and ensuring the integrity and homogeneity of the heterogeneous core–shell structure of SMCs are essential for optimizing their magnetic properties. In this study, four types of SMCs—Fe-Si-Cr/ZrO2, Fe-Si-Cr/TiO2, Fe-Si-Cr/MgO, and Fe-Si-Cr/CaO—were prepared via ball milling, followed by hot-press sintering. The differences between the microscopic morphologies and magnetic fproperties of the Fe-Si-Cr/AOx SMCs prepared using four different metal oxides were investigated. ZrO2, TiO2, MgO, and CaO were successfully coated on the surface of the Fe-Si-Cr alloy powders through ball milling, forming a heterogeneous Fe-Si-Cr/AOx core–shell structure with the Fe-Si-Cr alloy powder as the core and the metal oxide as the shell. ZrO2 is relatively hard and less prone to breakage and refinement during ball milling, resulting in a lower degree of agglomeration on the surface of the composites and prevention of peeling and collapse during hot-press sintering. When ZrO2 was used as the insulation layer, the magnetic dilution effect was minimized, resulting in the highest resistivity (4.2 mΩ·cm), lowest total loss (580.8 kW/m3 for P10mt/100kHz), and lowest eddy current loss (470.0 kW/m3 for Pec 10mt/100kHz), while the permeability stabilized earlier at lower frequencies.

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Section: Introductionmentioning

confidence: 99%

Effect of Various Metal Oxide Insulating Layers on the Magnetic Properties of Fe-Si-Cr Systems

Huang

et al. 2023

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“…To obtain a soft magnetic composite, a ferromagnetic part must be isolated by a layer that can be organic or inorganic and, further, the powder must be densified. Ferromagnetic parts based on Fe and Fe-based alloys are principal candidates [1] and a large range of SMCs containing Fe/Fe-based alloys have previously been developed, such as Fe/resin/Ni-Zn ferrite nanofibers [5], Fe@SiO 2 /ferrite [6], Fe/Silicate glass [7], Fe/nano-ZnO/boron oxide [8], Fe/polymer [9], and FeSiAl/Al 2 O 3 -MnO-Al 2 O 3 [10]. The method of covering and the materials that cover the ferromagnetic part are basic aspects of SMC [1,6,10].…”

Section: Introductionmentioning

confidence: 99%

“…Ferromagnetic parts based on Fe and Fe-based alloys are principal candidates [1] and a large range of SMCs containing Fe/Fe-based alloys have previously been developed, such as Fe/resin/Ni-Zn ferrite nanofibers [5], Fe@SiO 2 /ferrite [6], Fe/Silicate glass [7], Fe/nano-ZnO/boron oxide [8], Fe/polymer [9], and FeSiAl/Al 2 O 3 -MnO-Al 2 O 3 [10]. The method of covering and the materials that cover the ferromagnetic part are basic aspects of SMC [1,6,10]. Besides these, another important aspect is the densification technique; a good densification technique that allows the acquisition of very dense compacts will provide proper magnetic characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…This iron alloy, with Si content of 6-11 wt% and Al content of 4-8 wt% shows excellent soft magnetic properties (low power losses, good level of magnetic induction, high magnetic permeability, and low coercivity) and is low cost [11,12]. Several soft magnetic composites based on Sendust-type powder have been obtained to date [10,[13][14][15][16][17][18]. Generally, for SMC compact preparation, the powder, covered by various types of insulating layers, is pressed into the desired shape and post-densifying annealing is applied [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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Spark Plasma Sintered Soft Magnetic Composite Based on Fe-Si-Al Surface Oxidized Powders

et al. 2022

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Soft magnetic composites (SMCs) need a stable matrix to apply heat treatments for enhancing their magnetic characteristics. A stable matrix can be offered by alumina, but the densification of the ferromagnetic particles covered by this oxide (by sintering) can be very difficult. This paper proposes a feasible synthesis route for obtaining alumina matrix SMCs. An Fe-Si-Al alloy with nominal composition Fe85Si9Al6 was obtained by mechanical alloying of elemental Fe, Si, and Al powders, and further, the as-milled powders were superficially oxidized by immersion in HCl solution. The oxide layer was composed of iron, silicon, and aluminum oxides, as the Fourier-transform infrared spectroscopy technique revealed. The Fe-Si-Al@oxide powder was densified by the spark plasma sintering technique—SPS. Upon sintering, a continuous matrix of oxide (mainly alumina) was formed by the reaction of the Fe-Si-Al powder coreswith their oxide layer. The main part of the composite compacts after sintering consisted of an Fe3Si-ordered phase dispersed in an oxide matrix. The DC and AC tests of magnetic composite compacts showed that upon increasing the sintering temperature, the density, magnetic induction, and magnetic permeability increased. The initial magnetic permeability was constant in the entire range of testing frequencies and the magnetic losses increased linearly. The stability of the magnetic characteristics in frequency is promising for developing further such types of magnetic composite.

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Sodium silicate coatings for improving soft magnetic properties of FeSiAl powder cores with industrial compatibility

Wang,

Liu,

Zhu

et al. 2024

J Mater Sci: Mater Electron

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Preparation and magnetic performance optimization of FeSiAl/Al2O3–MnO–Al2O3 soft magnetic composites with particle size adjustment

Cited by 16 publications

References 31 publications

Effect of Various Metal Oxide Insulating Layers on the Magnetic Properties of Fe-Si-Cr Systems

Effect of Various Metal Oxide Insulating Layers on the Magnetic Properties of Fe-Si-Cr Systems

Spark Plasma Sintered Soft Magnetic Composite Based on Fe-Si-Al Surface Oxidized Powders

Sodium silicate coatings for improving soft magnetic properties of FeSiAl powder cores with industrial compatibility

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