Effects of adding carbonyl Fe or Mn–Zn ferrite powders to fibre-based soft magnetic composites prepared via hybrid cold sintering/spark plasma sintering

Neamţu, B.V.; Năsui, M.; Cupa, G.; Ware, E.; Popa, F.; Marinca, T.F.; Chicinaş, I.

doi:10.1016/j.jmrt.2023.12.231

Cited by 7 publications

(2 citation statements)

References 48 publications

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“…After the milling process, the powder was sieved and a fraction under 400 µm was chosen. In theory, the smaller particles could fill the gaps created between bigger particles during the compaction process and consequently, the compacts would have a larger density volume and less amount of air voids [29]. Then, the sieved powder particles made by using different BPR values were divided into two groups, one of which used a relatively new method of the surface "smoothing" process.…”

Section: Sieving Of Powdered Particles (Separation Of the Suitable Si...mentioning

confidence: 99%

Exploring the Impact of Different Milling Parameters of Fe/SiO2 Composites on Their Structural and Magnetic Properties

Rudeichuk,

Olekšáková,

Maciaszek

et al. 2024

Materials

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This research focuses on the production process of soft magnetic composites in the form of 3D bulk compacts made from insulated powder particles using different milling parameters, aiming to enhance their magnetic properties and to study an innovative method of the powder surface “smoothing” technique. A structure analysis using scanning electron microscopy (SEM), EDS, and optical microscopy is also included. We found out that the samples made by the innovative method have lower density values. This can be caused by a more consistent SiO2 insulation layer on highly pure iron powder particles. A correlation between the mechanical smoothing method and better insulation of powder particles can help to provide eco-friendlier solutions for the preparation of soft magnetic composites, such as less usage of reagents and more consistent coverage of powder particles with lower final insulation thickness. The magnetic properties of these compacts are evaluated by coercive field, permeability, and loss measurements. The particle-level smoothing technique in some cases can reduce the value of coercivity up to 20%. For some samples, the ball-to-powder ratio has a bigger impact on magnetic properties than surface treatment, which can be caused by an increased amount of insulation in the SMC compacts.

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Section: Sieving Of Powdered Particles (Separation Of the Suitable Si...mentioning

confidence: 99%

Exploring the Impact of Different Milling Parameters of Fe/SiO2 Composites on Their Structural and Magnetic Properties

Rudeichuk,

Olekšáková,

Maciaszek

et al. 2024

Materials

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“…There are two types of insulation coating for FeSiCr-based SMCs: organic and inorganic. Epoxy resin, silicone resin, and polyimide resin are generally used as the organic coating [11], while phosphides, SiO 2 , ZrO 2 , Al 2 O 3 , ferrite, etc., can be employed as inorganic coating [12][13][14]. The organic coating materials facilitate the formability of the powder core during compaction, and the inorganic coating materials mainly provide high resistivity to reduce the eddy current losses of SMCs at high frequencies [15].…”

Section: Introductionmentioning

confidence: 99%

Optimizing FeSiCr-Based Soft Magnetic Composites Using the Deionized Water as the Phosphating Solvent

Li,

Yu,

Wang

et al. 2024

Materials

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To prepare a soft magnetic powder core, the magnetic powder surface has to be insulated by phosphating treatment. Organic chemicals such as ethanol and acetone are generally used as solvents for phosphoric acid, which may cause serious environmental problems. This work proposed deionized water as the environmentally friendly phosphating solvent for FeSiCr powder. The soft magnetic composites (SMCs) were prepared using phosphoric acid for inorganic coating and modified silicon polymer for organic coating. The effect of different phosphating solvents, including deionized water, ethanol, and acetone, on the structure and magnetic properties of SMCs were investigated. It is found that the solvent affects the phosphating solution’s stability and the phosphoric acid’s ionization. The phosphoric acid is more stable in deionized water than in ethanol and acetone. The phosphating reaction in deionized water is also more stable in deionized water, resulting in a dense phosphate coating on the particle surface. The effects of phosphoric acid concentration and temperature on the magnetic properties of FeSiCr-based SMCs were further studied. With the increase in phosphoric acid concentration and temperature, the magnetic permeability and saturation magnetization of the powder core decrease, and the core loss decreases, followed by an increase. The optimized combination of properties was obtained for the SMCs phosphated with 0.2 wt.% phosphoric acid in deionized water at 35 °C, including a high effective permeability μe of 25.7, high quality factor Q of 80.2, low core loss Pcv of 709.5 mW/cm3 measured at 0.05 T @ 100 kHz, and high withstanding voltage of 276 V, due to the formation of uniform and dense insulating coating layers. In addition, the SMCs prepared with phosphated powder show good corrosion resistance. The anti-corrosion properties of the SMCs using deionized water as a phosphating solvent are better than those using ethanol and acetone.

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Enhanced microwave absorption in C@Co/carbonyl iron fiber composite with multi-level interfaces

Sun,

Xie,

Yang

et al. 2024

Adv Compos Hybrid Mater

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Effects of adding carbonyl Fe or Mn–Zn ferrite powders to fibre-based soft magnetic composites prepared via hybrid cold sintering/spark plasma sintering

Cited by 7 publications

References 48 publications

Exploring the Impact of Different Milling Parameters of Fe/SiO2 Composites on Their Structural and Magnetic Properties

Exploring the Impact of Different Milling Parameters of Fe/SiO2 Composites on Their Structural and Magnetic Properties

Optimizing FeSiCr-Based Soft Magnetic Composites Using the Deionized Water as the Phosphating Solvent

Enhanced microwave absorption in C@Co/carbonyl iron fiber composite with multi-level interfaces

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