Preparation and characterisation of Fe/Fe3O4 fibres based soft magnetic composites

Neamţu, B.V.; Pszola, M.; Vermeșan, Horațiu; Stoian, George; Grigoraş, M.; Opriş, A.; Cotojman, Loredana; Marinca, Traian Florin; Lupu, Nicoleta; Chicinaş, Ionel

doi:10.1016/j.ceramint.2020.08.165

Cited by 13 publications

(4 citation statements)

References 33 publications

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“…The magnetic properties of SMC composites can also be improved by using powders with amorphous microstructure [10,[12][13][14]. As a result of using nanocrystalline or amorphous materials, SMC composite can be obtained with lower core losses, including even in the absence of an oxide layer and in low-frequency fields (466.5 mV at 100 kHz and 50 mT and low coercivity (35 A/m).…”

Section: Simulation Of Magnetic Properties Of Composites Based On Mag...mentioning

confidence: 99%

3D Printing of Composite Material for Electromechanical Energy Harvesters

et al. 2022

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In this paper, a novel, composite material is proposed based on ferromagnetic wires immersed in a polymer that is well suited for 3D printing. The magnetic properties of this material are examined using FEM and compared with the properties of a more traditional composite based on magnetic powder. For a 50% ferromagnetic volume in the material, the proposed composite has a 67% higher value of saturation magnetic flux density and 87% higher value of maximum permeability, compared with the powder-based material. The authors believe that the proposed material could be used in the manufacturing of small electromechanical devices such as energy harvesters, thus vastly widening the possible fields of application related to 3D printing techniques.

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Section: Simulation Of Magnetic Properties Of Composites Based On Mag...mentioning

confidence: 99%

3D Printing of Composite Material for Electromechanical Energy Harvesters

et al. 2022

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“…The ZnO layer of the 0.05 M sample is thinner and more continuous than the ZnO layer of the 0.1 M sample. It was previously reported that by increasing the thickness of the insulating layer, the displacement of the domain walls becomes increasingly difficult [25,35]. This leads to an increase in the hysteresis losses of the compact.…”

Section: And Ac Characteristics Of the Cold Sintered Fibre-based Soft...mentioning

confidence: 99%

“…Recently, a new type of SMCs was reported: fibre-based soft magnetic composites (FSMCs) [16,[23][24][25][26]. The preparation process of FSMCs is similar to that of SMCs, with the exception that the long ferromagnetic fibres are arranged in a mould in such a way as to achieve their ordered orientation along the direction of the magnetising field.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Deposition of ZnO Layer on Fe-Based Amorphous Fibres Used for the Preparation of Cold Sintered Fibre-Based Soft Magnetic Composites

et al. 2022

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This paper presents findings on the influence of hydrothermal deposition processing parameters (precursor concentration and deposition duration) on the characteristics of ZnO layers deposited on the surface of amorphous Fe-based fibres. The characteristics of the coated fibres, especially the deposited layer, were investigated from structural, morphological, chemical, thermal and magnetic points of view. It was found that the use of a zinc acetate-based solution of 0.05 M concentration and a deposition duration of 24 h leads to a continuous, thin and adherent layer of ZnO on the surface of the fibres. The thickness of the ZnO layer is 450–500 nm, as shown by TEM-EDX investigations. The ZnO coated fibres were used to prepare fibre-based soft magnetic composites via a cold sintering process. The composites obtained are the first reported soft magnetic composites based on amorphous fibres. The coercive field of the cold sintered composites is 3.5 to 8.6 times lower, and the maximum relative permeability is 2.4 times larger, than the best coercive field and the maximum relative permeability reported until now for a crystalline fibre-based soft magnetic composite. The initial relative permeability of cold sintered composites is constant up to the frequency of 1000 Hz.

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“…An organic insulating layer limits the thermal treatment temperature of SMCs, while an inorganic coating such as Al 2 O 3 , SiO 2 , or ZrO 2 degrades the saturation magnetization due to the magnetic dilution effect induced by the non-magnetic insulating layer [ 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. To overcome these deficiencies, ferromagnetic materials such as ferrite-type systems, Mn-Zn ferrites, Ni-Zn ferrites, and Fe x O y (especially Fe 3 O 4 ) have been considered as the suitable insulating layer [ 8 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. Additionally, several studies present the elaboration of SMCs with an inorganic double-insulating layer that enhances heat resistance and enables enhanced magnetic and mechanical performance by high-temperature annealing [ 4 , 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Fe@Fe3O4/ZnFe2O4 Powders and Their Consolidation via Hybrid Cold-Sintering/Spark Plasma-Sintering

Mesaros,

Neamțu,

Marinca

et al. 2024

Nanomaterials

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Our study is focused on optimizing the synthesis conditions for the in situ oxidation of Fe particles to produce Fe@Fe3O4 core–shell powder and preparation via co-precipitation of ZnFe2O4 nanoparticles to produce Fe@Fe3O4/ZnFe2O4 soft magnetic composites (SMC) through a hybrid cold-sintering/spark plasma-sintering technique. XRD and FTIR measurements confirmed the formation of a nanocrystalline oxide layer on the surface of Fe powder and the nanosized nature of ZnFe2O4 nanoparticles. SEM-EDX investigations revealed that the oxidic phase of our composite was distributed on the surface of the Fe particles, forming a quasi-continuous matrix. The DC magnetic characteristics of the composite compact revealed a saturation induction of 0.8 T, coercivity of 590 A/m, and maximum relative permeability of 156. AC magnetic characterization indicated that for frequencies higher than 1 kHz and induction of 0.1 T, interparticle eddy current losses dominated due to ineffective electrical insulation between neighboring particles in the composite compact. Nevertheless, the magnetic characteristics obtained in both DC and AC magnetization regimes were comparable to those reported for cold-sintered Fe-based SMCs.

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Preparation and characterisation of Fe/Fe3O4 fibres based soft magnetic composites

Cited by 13 publications

References 33 publications

3D Printing of Composite Material for Electromechanical Energy Harvesters

3D Printing of Composite Material for Electromechanical Energy Harvesters

Hydrothermal Deposition of ZnO Layer on Fe-Based Amorphous Fibres Used for the Preparation of Cold Sintered Fibre-Based Soft Magnetic Composites

Preparation of Fe@Fe3O4/ZnFe2O4 Powders and Their Consolidation via Hybrid Cold-Sintering/Spark Plasma-Sintering

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