Synthesis of well-insulated Fe–Si–Al soft magnetic composites via a silane-assisted organic/inorganic composite coating route

Guan, Weizheng; Shi, Xiaoyan; Xu, Tao; Wan, Kun; Zhang, B.W.; Liu, W.; Su, Hailin; Zou, Zhongqiu; Du, Youwei

doi:10.1016/j.jpcs.2020.109841

Cited by 31 publications

(5 citation statements)

References 34 publications

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“…This effect increased magnetoresistance by preventing Fe-Si-Cr particles from making electrical contact. In addition, the exchange coupling between the Fe-Si-Cr substrate and the non-conducting layers could result in an efficient surface spin orientation [21]. Nevertheless, when the frequency increased, the permeability of SMCs with thicker insulating layers stabilized at lower frequencies owing to enhanced skin effects [17].…”

Section: Microstructures and Magnetic Properties Of The Alloy Powders...mentioning

confidence: 99%

Fabrication and Soft Magnetic Properties of Fe–Si–Cr Composites with Double-Insulating Layers Suitable for High-Frequency Power Applications

Huang,

et al. 2023

Magnetochemistry

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Soft magnetic composites (SMCs) are composed of alloy materials with the core and insulating layers as the shell. These composites exhibit high saturation magnetic sensitivity and low hysteresis loss, making them a promising material for various applications. The investigation of double layers is considered valuable as it can effectively address the issues of low resistivity and high dynamic loss that arise from non-uniform insulating layers in SMCs. In this study, Fe-Si-Cr/SiO2 particles with a core–shell heterostructure were produced via chemical vapor deposition (CVD). The Fe-Si-Cr/SiO2 materials were coated with different weight percentages (1–6%) of sodium silicate (SS). Subsequently, Fe-Si-Cr-based SMCs were synthesized through high-pressure molding and heat treatment. The effect of the SS weight percentage on microscopic changes and magnetic characteristics was investigated. These findings indicated that a concentration of 4 wt% of SS was the most effective at enhancing magnetic characteristics. The resultant SMCs exhibited high resistivity (21.07 mΩ·cm), the lowest total loss (P10 mt/300 kHz of 44.23 W/kg), a relatively high saturation magnetization (181.8 emu/g), and permeability (35.9). Furthermore, it was observed that the permeability exhibited stabilization at lower frequencies. According to these findings, the combination of CVD and double layers could lead to the further development of SMCs in a variety of applications.

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Section: Microstructures and Magnetic Properties Of The Alloy Powders...mentioning

confidence: 99%

Fabrication and Soft Magnetic Properties of Fe–Si–Cr Composites with Double-Insulating Layers Suitable for High-Frequency Power Applications

Huang,

et al. 2023

Magnetochemistry

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“…However, this would inevitably lead to a decrease in permeability. For example, some researchers investigated the effect of an insulation material's content on the magnetic properties of Fe-Si-Al powder cores, and they found that the percentages of effective permeability at 100 Oe would increase approximately from 40% to 75% as the insulation material's content increased from 3 wt.% to 11 wt.%, while in the meantime, the permeability level was reduced from 75 µ to 45 µ [13,14]. As mentioned above, a suitable particle size ratio would optimize the anti-saturation performance of powder cores, which has already been adopted by some researchers to improve the anti-saturation performance of Fe-Si-Al powder cores.…”

Section: Introductionmentioning

confidence: 99%

Improved Anti-Saturation Performance of Fe-Si-Al Soft Magnetic Powder Core via Adjusting the Alloy Composition

Zhang,

Zou,

Zhang

et al. 2024

Metals

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Ball-milled Fe-Si-Al soft magnetic powder cores with the particle compositions away from the classical Sendust point were prepared in this work. The influences of alloy composition on the metallographic structure, density, hardness, and resistivity of Fe-Si-Al alloy, as well as the frequency-dependent permeability, loss, and the anti-saturation performance of Fe-Si-Al powder cores, were investigated systematically. It was found that the hardness of Fe-Si-Al alloy increases with the Si mass ratio and the saturation magnetization (Ms) increases with the Fe mass ratio. The alloy hardness affects the particle size after the ball-milling process and, thus, influences the porosity of the powder core. Together with adjusting the demagnetization field by controlling the particle size and the core’s porosity, changing the alloy composition to drive K and λ deviating from zero can effectively improve the anti-saturation performance of Fe-Si-Al powder cores at the expense of hysteresis loss, to some extent. In this work, good comprehensive magnetic properties were obtained in the Fe85.5-Si12-Al2.5 powder core. Its effective permeability percentage at 100 Oe and Ms were 59.12% and 132.23 emu/g, respectively, which are higher than those of the classical Sendust core. This work provides a feasible idea for optimizing the overall performance of the high-power magnetic device.

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“…12 Eddy current can be decreased by decreasing the particle size or by coating with an insulation layer. 13 For example, two-dimensional sandwiched FeNi@SnO 2 has been synthesized by Lv et al and owing to the rich attenuation mechanisms, including dipole polarization, exchange resonance and interfacial polarization, an ultrawide EAB of 11.70 GHz can be obtained at a thickness of 1.75 mm. 14 On the basis of the above discussions, magnetic materials with ingeniously designed structures may have a great chance to become highly efficient MAMs working at ultralow matching thickness.…”

Section: Introductionmentioning

confidence: 99%

One-dimensional MOF-derived magnetic composites for efficient microwave absorption at ultralow thickness through controllable hydrogen reduction

et al. 2022

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Synthesis of well-insulated Fe–Si–Al soft magnetic composites via a silane-assisted organic/inorganic composite coating route

Cited by 31 publications

References 34 publications

Fabrication and Soft Magnetic Properties of Fe–Si–Cr Composites with Double-Insulating Layers Suitable for High-Frequency Power Applications

Fabrication and Soft Magnetic Properties of Fe–Si–Cr Composites with Double-Insulating Layers Suitable for High-Frequency Power Applications

Improved Anti-Saturation Performance of Fe-Si-Al Soft Magnetic Powder Core via Adjusting the Alloy Composition

One-dimensional MOF-derived magnetic composites for efficient microwave absorption at ultralow thickness through controllable hydrogen reduction

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