Soft magnetic composites: recent advancements in the technology

Sunday, Katie Jo; Taheri, Mitra L.

doi:10.1016/j.mprp.2016.08.003

Cited by 189 publications

(46 citation statements)

References 43 publications

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“…Soft magnetics composites (SMCs) are promising substitutes for laminate steels in electromagnetic applications such as transformers, generators and motors [1] due to their core-shell structure [2] and unique properties including high magnetic saturation, high magnetic permeability, high resistivity, low core loss, high degree of productivity and three-dimensional (3D) isotropy [3][4][5]. Basically, the SMC cores are produced by traditional powder metallurgy techniques including mixing soft ferromagnetic powders with insulating materials and lubricants, compacting and pressing them to the desired shapes, as well as the subsequent annealing treatment [3,6] to relieve stress. However, insulating layers would be easily destroyed under too high pressing pressure during the compaction process so that the adjacent iron powers would connect directly with each other and the eddy-current loss would increase sharply as a result [7].…”

Section: Introductionmentioning

confidence: 99%

Effects of compaction and heat treatment on the soft magnetic properties of iron-based soft magnetic composites

Pan

Peng²,

Qian

et al. 2020

Mater. Res. Express

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Iron-based soft magnetic composites (SMCs) are promising substitutes for laminate steels in electromagnetic applications due to their excellent magnetic properties and productivity. However, the preparation process is a key factor in deciding the magnetic performance of SMCs. In this work, the Fe-based soft magnetic composites with improved soft magnetic properties were achieved by optimizing the compaction and the annealing process. Results showed that the core-shell structure of powders which would directly have an impact on the permeability and the core loss of the SMCs could be affected by the compaction and the annealing process. In addition, the magnetic properties were enhanced by tuning the microstructure. As a result, the optimal magnetic performance of the compact with high permeability and low total core loss was obtained. The real part of the permeability of the soft magnetic composites could reach a maximal value of 336.8 and a rather low core loss of 2.5 W Kg −1 (measured at 50 mT and 5 kHz). Therefore, soft magnetic composites with enhanced magnetic properties were obtained by optimizing the powder metallurgy (PM) process in this study.

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Section: Introductionmentioning

confidence: 99%

Effects of compaction and heat treatment on the soft magnetic properties of iron-based soft magnetic composites

Pan

Peng²,

Qian

et al. 2020

Mater. Res. Express

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“…Relatively new and remarkable kind of soft magnetic materials named soft magnetic composites (SMCs) consists of small ferromagnetic particles electrically insulated from each other. They provide some advantages in comparison with traditional materials (electrical steels or soft magnetic ferrites), as the three-dimensional isotropic physical properties, lower total energy losses at medium to higher frequencies due to lower classical eddy current losses, relatively high saturation induction and the near net shape powder metallurgy fabrication process beneficial from the economical, as well as ecological view [1][2][3][4]. SMCs find increasing application potential as cores for transformers, electromotors, generators, electromagnetic circuits, sensors, actuation devices, or induction coils.…”

Section: Introductionmentioning

confidence: 99%

“…SMCs find increasing application potential as cores for transformers, electromotors, generators, electromagnetic circuits, sensors, actuation devices, or induction coils. Each application often requires specific material properties, which can be tuned in wide ranges by the composition of SMC and technological process parameters [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

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Functional Properties and Microstructure Development of Micro-Nano Fe/MgO Composite

et al. 2020

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Micro-nano soft magnetic composite Fe/xMgO was prepared by press and sinter method. The microstructure and functional properties were investigated in dependence on particle size of MgO, as well as on MgO content ratio. Changes of electrical and magnetic properties were clarified on the background of the microstructure development. Particle size of the dielectric MgO phase significantly influenced the densification process, as well as the quality of insulation of each Fe particle from the others, hence the magnetic properties of composite. Significant influence of MgO particle size was observed at frequency of 1 MHz. Value of real part of complex permeability increased with increasing MgO particle size in this order: 10 nm, 1000 nm and the highest value was achieved in Fe/3MgO with 30 nm MgO particles.

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“…Moreover the functional SMCs require materials with superb soft magnetic properties and posses the high handling strength in a manufacturing facility and perform at high speed. Therefore a selection of materials for preparation of SMCs lies in balancing high electrical resistivity, high mechanical strength, and high magnetic performance utilizing both a core and coating material, or maybe a new class of materials [2].…”

Section: Introductionmentioning

confidence: 99%

The Preparation of Soft Magnetic Composites Based on FeSi and Ferrite Fibers

Strečková

Fáberová

Búreš

et al. 2016

Powder Metallurgy Progress

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The fields of soft magnetic composites and powder metallurgy technologies have a powerful potential to redesign the way of electric motor preparation, and will continue to grow for years to come. A design of the novel soft microcomposite material composed of spherical FeSi particles and Ni0.3Zn0.7Fe2O4 ferrite nanofibers is reported together with a characterization of basic mechanical and electrical properties. The needle-less electrospinning method was used for a preparation of Ni0.3Zn0.7Fe2O4 ferrite nanofibers, which has a spinel-type crystal structure as verified by XRD and TEM analysis. The dielectric coating was prepared by mixing of nanofibers with glycerol and ethanol because of safe manipulation with fumed fibers and homogeneous distribution of the coating around the FeSi particle surface. The final microcomposite samples were prepared by a combination of the traditional PM compaction technique supplemented with a conventional sintering process of the prepared green compacts. The composition and distribution of the secondary phase formed by the spinel ferrite fibers were examined by SEM. It is demonstrated that the prepared composite material has a tight arrangement without any significant porosity, which manifest itself through superior mechanical properties (high mechanical hardness, Young modulus, and transverse rupture strength) and specific electric resistivity compared to the related composite materials including resin as the organic binder.

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Soft magnetic composites: recent advancements in the technology

Cited by 189 publications

References 43 publications

Effects of compaction and heat treatment on the soft magnetic properties of iron-based soft magnetic composites

Effects of compaction and heat treatment on the soft magnetic properties of iron-based soft magnetic composites

Functional Properties and Microstructure Development of Micro-Nano Fe/MgO Composite

The Preparation of Soft Magnetic Composites Based on FeSi and Ferrite Fibers

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