Effect of the addition of Al2O3 nanoparticles on the magnetic properties of Fe soft magnetic composites

Peng, Yuandong; Nie, Jun; Zhang, Wenjun; Ma, Jian; Bao, Chao; Cao, Yang

doi:10.1016/j.jmmm.2015.09.069

Cited by 64 publications

(11 citation statements)

References 22 publications

(25 reference statements)

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“…Ceramic materials which are dia-or anti-ferromagnetic constitute one type. These materials-such as Al 2 O 3 [13], SiO 2 [14], and ZrO 2 [15]-which can significantly decrease the core loss at a high frequency, also decrease magnetic permeability by reducing the proportion of magnetic materials. Materials that exhibit ferro-or ferrimagnetism, which can ultimately affect the core loss and improve the magnetic permeability compared with the ceramic coating materials, constitute the other type.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Soft Magnetic Properties of Iron-Based Powder Cores with Co-Existence of Fe3O4–MnZnFe2O4 Nanoparticles

Xie

Yan

2018

Metals

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An iron-based soft magnetic composite with Fe 3 O 4 -MnZnFe 2 O 4 insulation coating has been prepared by powder metallurgy method. This work investigated the microstructure and magnetic properties of Fe/Fe 3 O 4 -MnZnFe 2 O 4 powder cores. Scanning electron microscopy (SEM) coupled with an energy dispersive spectrometry (EDS) analysis indicated that the Fe 3 O 4 and MnZnFe 2 O 4 nanoparticles were uniformly coated on the surface of Fe powders. The co-existence of Fe 3 O 4 and MnZnFe 2 O 4 contributes to the preferable distribution of nano-sized insulation powders and excellent soft magnetic properties of soft magnetic composite (SMC) with high saturation magnetization M s (215 A·m 2 /kg), low core loss (178.7 W/kg measured at 100 kHz, 50 mT), and high effective amplitude permeability of 114 (measured at 100 kHz). Overall, this work has great potential for realizing low core loss and outstanding soft magnetic properties of Fe-based powder cores.

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Section: Introductionmentioning

confidence: 99%

Enhanced Soft Magnetic Properties of Iron-Based Powder Cores with Co-Existence of Fe3O4–MnZnFe2O4 Nanoparticles

Xie

Yan

2018

Metals

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“…The excess losses W exc are one of the components of the basic classification of the total energy losses W t [2,[7][8][9][10] in ferromagnetic material, besides the DC losses W DC and the classical eddy current losses W c (where * corresponding author; e-mail: zuzana.bircakova@outlook.com in SMCs [1][2][3][4][5] furthermore the intra-particle and interparticle flowing of eddy currents is considered). W exc result predominantly from the eddy currents induced when the domain walls are moving [2,[7][8][9] and depend inversely on the effective number of movable domain walls n [2,8,9], W exc ≈ 1/n.…”

Section: Energy Losses and Demagnetizing Fieldsmentioning

confidence: 99%

“…Soft magnetic composite (SMCs) materials represent a specific class of ferromagnetic materials, composed of small ferromagnetic particles insulated from each other, resulting in some unique properties as the magnetic isotropy, and relatively low total energy losses at medium to higher frequencies, which make SMCs well suited for various AC and DC electromagnetic applications [1][2][3][4][5]. The structure of SMCs containing non-ferromagnetic components (insulation and pores) give rise to the inner demagnetizing fields [6,7], which cause that magnetization process is performed more or less independently in each ferromagnetic particle of SMC and hence certain magnetic properties dependences are different from the majority of cast ferromagnets [1][2][3][4][5][6]8].…”

Section: Introductionmentioning

confidence: 99%

“…The structure of SMCs containing non-ferromagnetic components (insulation and pores) give rise to the inner demagnetizing fields [6,7], which cause that magnetization process is performed more or less independently in each ferromagnetic particle of SMC and hence certain magnetic properties dependences are different from the majority of cast ferromagnets [1][2][3][4][5][6]8].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Magnetization Processes from the Energy Losses in Soft Magnetic Composite Materials

et al. 2017

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Soft magnetic composite materials are composed of small ferromagnetic particles insulated from each other. It gives them some very good properties e.g. the magnetic isotropy and low total energy losses at medium to higher frequencies. On the other hand, their structure gives rise to the negative aspects as the inner demagnetizing fields, resulting in some specifics in magnetization processes leading to the worsening of soft magnetic properties, particularly the excess losses increase and a lowering of permeability. The frequency dependence of excess losses, the low and high induction loss components and the inner demagnetization factors of soft magnetic composites were investigated in order to reveal the proportions of the reversible and irreversible magnetization processes. Higher excess losses were observed in samples with smaller particles or higher non-ferromagnetic content (resin+pores), in which the inner demagnetizing fields were higher. It was explained by lower effective number of movable domain walls in those samples, thus less irreversible magnetization processes. This was confirmed by low and high induction loss analysis, where total losses were divided into low and high induction loss components and plotted vs. frequency.

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“…• C [2,3]. Advanced compaction methods are investigated with focusing on optimization of intrinsic structure of SMC's and other functional materials [4,5].…”

Section: Introductionmentioning

confidence: 99%

Microwave Sintered Fe/MgO Soft Magnetic Composite

et al. 2017

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Micro/nano soft magnetic composite based on the Fe microparticles and the MgO nanoparticles was prepared by cold pressing followed by microwave sintering. Magnetic and mechanical properties of the green compact as well as sintered samples were measured. Coercivity, permeability, resistivity, elastic modulus and transverse rupture strength values in dependence on MgO content were investigated. The influence of MgO content ratio on properties was different in the case of as pressed green samples in comparison to sintered bodies. Microstructure formation and its influence on mechanical and magnetic properties are discussed. The coercivity of the green compacts with 1-5 wt% of MgO exhibits approximately 460 A/m and after sintering decreases to approximately 290 A/m. The real part of complex permeability at the frequency of 100 kHz exhibits a maximum for 2 wt% of MgO in green compacts, while for 10 wt% in sintered samples. It was observed that increase of the content of MgO causes decrease of the permeability. Properties of the sintered composite are related to formation of magnesium ferrite as well as volume distribution of residual MgO in dependence on initial MgO ratio.

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Effect of the addition of Al2O3 nanoparticles on the magnetic properties of Fe soft magnetic composites

Cited by 64 publications

References 22 publications

Enhanced Soft Magnetic Properties of Iron-Based Powder Cores with Co-Existence of Fe3O4–MnZnFe2O4 Nanoparticles

Enhanced Soft Magnetic Properties of Iron-Based Powder Cores with Co-Existence of Fe3O4–MnZnFe2O4 Nanoparticles

Investigation of Magnetization Processes from the Energy Losses in Soft Magnetic Composite Materials

Microwave Sintered Fe/MgO Soft Magnetic Composite

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