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1
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AC Magnetic Field Effect on the Complex Permeability Spectra of Soft Magnetic Fe_{73}Cu_{1}Nb_{3}Si_{16}B_{7} Powder Cores

100%
Füzer J., Dobák S., Füzerová J.
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vol. 126
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issue 1
88-89
EN
In this work, two soft magnetic Fe_{73}Cu_{1}Nb_{3}Si_{16}B_{7} powder core samples were investigated. Samples were prepared by milling of amorphous Fe_{73}Cu_{1}Nb_{3}Si_{16}B_{7} ribbon at different temperature conditions: sample R, by milling at room temperature and sample L, by cryomilling at temperature of liquid nitrogen. Influence of applied exciting AC magnetic field with various amplitudes on the complex permeability spectra was studied. Obtained results are explained by the dynamics and relaxation phenomenon of domain walls under the influence of AC magnetic field.
2
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Preparation and Characterization of Fe/SiO_{2} Powder Composites Using Impregnation Method

88%
Kabátová M., Füzer J., Füzerová J., Dudrová E., Kollár P.
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vol. 126
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issue 1
134-135
EN
Fe/SiO_{2} powder composite materials based on irregularly and/or spherically shaped iron powder particles with an addition of SiO_{2} nanopowder were prepared in two ways, (i) by mixing the Fe/SiO_{2} powder with 1.0 wt.% of Shellac dissolved in ethanol and (ii) by vacuum/pressure impregnation of low-temperature sintered Fe/SiO_{2} components with shellac dissolved in ethanol and with thermoplast SL450. SiO_{2} was implemented either as nanopowder or by sol-gel coating. Vacuum/pressure impregnation (VPI) of pre-sintered samples was performed in a steel container. The influence of iron particle shape and processing conditions on the electro-insulating layer was microscopically evaluated and correlated with the values of the electrical resistivity and coercivity. It has been found that the continuity, distribution and thickness of insulating phase is strongly controlled by the shape of iron particles. Using the VPI procedure, the irregular surface of iron particles may cause discontinuities of insulating layer, while the spherical iron particles are well covered with continuous evenly distributed insulating layer.
3
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The Influence of Preparation Methods on Magnetic Properties of Fe/SiO₂ Soft Magnetic Composites

88%
Füzerová J., Füzer J., Kollár P., Kabátová M., Dudrová E.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
816-818
EN
An analysis of several variants of the Fe/polymer/SiO₂ composites in terms of the impact of iron powder particle shape (irregular, spherical), of the content (0.4-2.0 wt%), of the polymer type (shellac, thermoset SL450) and the method of its application as well as the effect of the preparation procedure of the composites (mixing and/or vacuum-pressure impregnation) on properties of electrical insulating layer (thickness and coherence), electrical resistivity and magnetic properties was carried out. It was found that the main governing factor of the microstructure formation is the shape, surface microgeometry of the iron particles and the insulator layer. These determine not only the uniformity of thickness and cohesion of the insulating layer of the applied polymer or its hybrid modification (polymer+SiO₂ nanoparticles), but also the most suitable method of preparation in terms of the achieved values of electrical and magnetic properties of the composites.
4
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Wide Frequency Range AC Magnetic Properties of Fe-Based Composite Materials

76%
Kollár P., Birčáková Z., Füzer J., Füzerová J., Bureš R., Fáberová M.
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issue 5
759-761
EN
The aim of this work was to analyze the influence of resin content on contribution of the hysteresis, eddy current and anomalous losses to the total losses in the frequency range from DC to 150 kHz. The samples of composite material were prepared in the form of the ring with outer diameter of 25 mm, inner diameter of 17 mm and height approximately 3 mm and in the form of cylinder with diameter of 25 mm and height approximately 3 mm by a compaction of mixture of iron powder ASC100.29 (90 vol.%) and commercial termoset resins. The DC hysteresis losses were obtained by the measurements of DC hysteresis loops and the total power losses in the frequency range 0.4 Hz-150 kHz from AC hysteresis loops, both at maximum induction 0.05, 0.1 and 0.2 T. The magnetic properties of the composite rings were compared with the properties of the material prepared from the powder supported by Höganäs AB Sweden. By analyzing the frequency dependence of total losses of the Fe-based SMC we found out that hysteresis losses contribute to the total losses as a majority component.
5
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Magnetic Properties of Soft Magnetic FeSi Composite Powder Cores

76%
Lauda M., Füzer J., Füzerová J., Kollár P., Strečková M., Fáberová M.
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vol. 126
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issue 1
144-145
EN
Soft magnetic composites (SMCs), which are used in electromagnetic applications, can be described as ferromagnetic powder particles surrounded by an electrical insulating film. These composite materials offer several advantages over traditional laminated steel cores such as reduction in weight and size. They have some unique properties, including three-dimensional isotropic ferromagnetic behaviour, very low eddy current loss, relatively low total core loss at medium and high frequencies, high electrical resistivity and good relative magnetic permeability. FeSi powder was used as a base ferromagnetic material for preparation of soft magnetic composites. The commercial FeSi particles of a precise spherical shape were prepared in two granulometric fractions (up to 150 μm or up to 356 μm). The phenol-formaldehyde resin modified by SiO_{2} nanoparticles was used as an electroinsulating layer. The FeSi particles covered by the synthesized resin were compacted at 800 MPa into the ring samples for magnetic measurements. The final samples were treated thermally under the curing schedule, which was suggested according to thermal degradation of the modified resin.
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