The effect of calcination temperature on microstructure and properties of FeNiMo@Al2O3 soft magnetic composites prepared by sol-gel method

Yao, Zhixin; Peng, Yuandong; Xia, Chao; Yi, Xuwu; Mao, Shenghua; Zhang, Miantuan

doi:10.1016/j.jallcom.2020.154345

Cited by 38 publications

(4 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Here 1 MHz stability is achieved at 98.7%. In comparison to other SMCs such as FeNiMo/Al 2 O 3 , 31 Fe/Al 2 O 3 , 34,37 Fe 3 Si/Al 2 O 3 , 11 FeSiAl/Al 2 O 3 , 24 Fe/SiO 2 (ref. 36) and FeSiCr/NiZn, 38 the FeNiMo/SiO 2 cores have enhanced high-frequency stability in the range of 100–1000 kHz.…”

Section: Resultsmentioning

confidence: 96%

Enhanced soft magnetic properties and high-frequency stability of FeNiMo powder cores by coating SiO₂ insulation layer

et al. 2023

View full text Add to dashboard Cite

show abstract

Section: Resultsmentioning

confidence: 96%

Enhanced soft magnetic properties and high-frequency stability of FeNiMo powder cores by coating SiO₂ insulation layer

et al. 2023

View full text Add to dashboard Cite

show abstract

“…The other important band of SiO 2 is at about 511 cm −1 (bending vibration mode in O-Si-O) and is partially covered by other bands close to this value. The bands centered at 548 and 720 cm −1 are assigned to Al-O bands from Al 2 O 3 to tetrahedral (Al-O 4 ) and octahedral (Al-O 6 ) groups [33][34][35]. The bands of Me-O (Al-O and Fe-O) are all at around 500 cm −1 and therefore they are superposed, entirely or partially, giving a large band.…”

Section: Fe-al-si@oxide Core-shell Powdermentioning

confidence: 99%

Spark Plasma Sintered Soft Magnetic Composite Based on Fe-Si-Al Surface Oxidized Powders

et al. 2022

View full text Add to dashboard Cite

Soft magnetic composites (SMCs) need a stable matrix to apply heat treatments for enhancing their magnetic characteristics. A stable matrix can be offered by alumina, but the densification of the ferromagnetic particles covered by this oxide (by sintering) can be very difficult. This paper proposes a feasible synthesis route for obtaining alumina matrix SMCs. An Fe-Si-Al alloy with nominal composition Fe85Si9Al6 was obtained by mechanical alloying of elemental Fe, Si, and Al powders, and further, the as-milled powders were superficially oxidized by immersion in HCl solution. The oxide layer was composed of iron, silicon, and aluminum oxides, as the Fourier-transform infrared spectroscopy technique revealed. The Fe-Si-Al@oxide powder was densified by the spark plasma sintering technique—SPS. Upon sintering, a continuous matrix of oxide (mainly alumina) was formed by the reaction of the Fe-Si-Al powder coreswith their oxide layer. The main part of the composite compacts after sintering consisted of an Fe3Si-ordered phase dispersed in an oxide matrix. The DC and AC tests of magnetic composite compacts showed that upon increasing the sintering temperature, the density, magnetic induction, and magnetic permeability increased. The initial magnetic permeability was constant in the entire range of testing frequencies and the magnetic losses increased linearly. The stability of the magnetic characteristics in frequency is promising for developing further such types of magnetic composite.

show abstract

“…Soft magnetic composites (SMCs) are promising candidates for high-frequency magnetic devices ascribed to their simultaneously high M s and high 𝜌. [13,14] In a typical process, metallic magnetic particles are electrically insulated by various methods (acid passivation, [15] oxide addition, [16] sol-gel process [17,18] etc. ), bonded by organic resins, and finally cold-pressed under high pressure (up to 2 GPa) for acceptable densification.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Reaction Enhanced Liquid‐Phase Sintering of Metal/Oxide Soft Magnetic Composite

Bai

Liu

Bandaru

et al. 2023

Adv Funct Materials

View full text Add to dashboard Cite

Soft magnetic composites (SMCs) are ungently demanded in high‐frequency power electronics for their large magnetization and high electrical resistivity. However, traditional cold‐pressed SMCs are faced with low mechanical strength and insulation instability, which severely restricts their applications. In this study, liquid‐phase sintering techniques to prepare FeSiAl/MoO3 SMCs are orginally employed, where consolidation and insulation of metallic magnetic particles are achieved in one step. The redox reaction between FeSiAl and MoO3 melt greatly reduces the interfacial energy, facilitates fully wetting of FeSiAl particles by MoO3 melt, and promotes the densification process during sintering. In the final FeSiAl/MoO3 SMC, FeSiAl particles are bonded covalently and insulated electrically/magnetically by the resultant Al2O3 transition layer, endowing the SMC with high crushing strength of 250 MPa, cut‐off frequency of 110 MHz, permeability of 35 (@1 MHz), and low power loss of 962 kW m−3 (5 MHz, 5 mT). This study provides alternative concept for designing new SMCs, and broadens the connotation and extension of liquid‐phase sintering.

show abstract

The effect of calcination temperature on microstructure and properties of FeNiMo@Al2O3 soft magnetic composites prepared by sol-gel method

Cited by 38 publications

References 37 publications

Enhanced soft magnetic properties and high-frequency stability of FeNiMo powder cores by coating SiO₂ insulation layer

Enhanced soft magnetic properties and high-frequency stability of FeNiMo powder cores by coating SiO₂ insulation layer

Spark Plasma Sintered Soft Magnetic Composite Based on Fe-Si-Al Surface Oxidized Powders

Interfacial Reaction Enhanced Liquid‐Phase Sintering of Metal/Oxide Soft Magnetic Composite

Contact Info

Product

Resources

About

The effect of calcination temperature on microstructure and properties of FeNiMo@Al2O3 soft magnetic composites prepared by sol-gel method

Cited by 38 publications

References 37 publications

Enhanced soft magnetic properties and high-frequency stability of FeNiMo powder cores by coating SiO2 insulation layer

Enhanced soft magnetic properties and high-frequency stability of FeNiMo powder cores by coating SiO2 insulation layer

Spark Plasma Sintered Soft Magnetic Composite Based on Fe-Si-Al Surface Oxidized Powders

Interfacial Reaction Enhanced Liquid‐Phase Sintering of Metal/Oxide Soft Magnetic Composite

Contact Info

Product

Resources

About

Enhanced soft magnetic properties and high-frequency stability of FeNiMo powder cores by coating SiO₂ insulation layer

Enhanced soft magnetic properties and high-frequency stability of FeNiMo powder cores by coating SiO₂ insulation layer