Influence of SiO2 insulation layers thickness distribution on magnetic behaviors of Fe-Si@SiO2 soft magnetic composites

Liu, L.; Yue, Qiang; Li, G.Q.; Xu, Kun; Wang, J.; Wu, Zhaoyang; Fan, Xiaoliang

doi:10.1016/j.jpcs.2019.04.016

Cited by 30 publications

(8 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, iron losses are related to the SiO 2 content percentage in weight. The limit percentages are about 1.25 wt.%, as shown by Liu et al [39].…”

Section: Silicamentioning

confidence: 56%

“…Many coating processes are primarily based on the Fe-Si spherical ferromagnetic particles (gas-atomized Fe-6.5 wt.% Si powder) [27,28,33,36,37,39] or sometimes irregular powder shape [29,30,38]. For this reason, it is important at first to define the typology and sizes of iron powder.…”

Section: Production Methods Of Silica-coated Smcsmentioning

confidence: 99%

“…The adoption of the Stöber method allows to separate the magnetic phases effectively by a homogeneous and uniform intergranular insulating phase. The process via chemical vapor deposition (CVD) shows very promising results, as mentioned above [37], and similar techniques are used by Liu et al [39]. Luo et al [32] adopted water oxidation combined with spark plasma sintering (SPS): the process is more cost-effective and straightforward than other reported methods.…”

Section: Production Methods Of Silica-coated Smcsmentioning

confidence: 99%

See 2 more Smart Citations

Recent Advances in Multi-Functional Coatings for Soft Magnetic Composites

et al. 2021

View full text Add to dashboard Cite

During the past 50 years, the aim to reduce the eddy current losses in magnetic cores to a minimum led to the formulation of new materials starting from electrically insulated iron powders, today called Soft Magnetic Composites (SMC). Nowadays, this promising branch of materials is still held back by the mandatory tradeoff between energetic, electrical, magnetic, and mechanical performances. In most cases, the research activity focuses on the deposition of an insulating/binding layer, being one of the critical points in optimizing the final composite. This insulation usually is achieved by either inorganic or organic layer constituents. The main difference is the temperature limit since most inorganic materials typically withstand higher treatment temperatures. As a result, the literature shows many materials and process approaches, each one designed to meet a specific application. The present work summarizes the recent advances in state of the art, analyzing the relationship among material compositions and magnetic and mechanical properties. Each coating shows its own processing sets, which vary from simple mechanical mixing to advanced chemical methods to metallurgical treatments. From state of the art, Aluminum coatings are characterized by higher current losses and low mechanical properties. In contrast, higher mechanical properties are obtained by adopting Silicon coatings. The phosphates coatings show the best-balanced overall properties. Each coating type was thoroughly investigated and then compared with the literature background highlighting. The present paper thus represents a critical overview of the topic that could serve as a starting point for the design and development of new and high-performing coating solutions for SMCs. However, global research activity continuously refines the recipes, introducing new layer materials. The following steps and advances will determine whetherthese materials breakthrough in the market.

show abstract

“…Moreover, iron losses are related to the SiO 2 content percentage in weight. The limit percentages are about 1.25 wt.%, as shown by Liu et al [39].…”

Section: Silicamentioning

confidence: 56%

Section: Production Methods Of Silica-coated Smcsmentioning

confidence: 99%

Section: Production Methods Of Silica-coated Smcsmentioning

confidence: 99%

See 1 more Smart Citation

Recent Advances in Multi-Functional Coatings for Soft Magnetic Composites

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The most effective way to optimize the features of SMCs is to incorporate them into core-shell (C-S) structures by coating the ferromagnetic core particles with an insulative shell. The C-S structure can significantly enhance the surface resistance of ferromagnetic particles and reduce the effective diameters of eddy currents [4,5] for the realization of high-energy electromagnetic conversion devices.…”

Section: Introductionmentioning

confidence: 99%

“…As basic and applied research on SMCs has progressed, it has been widely accepted that increasing the structural integrity and uniformity of C-S structures will reduce iron loss at extremely high-energy densities. Furthermore, the thickness of the insulative shell coating affects carrier migration and the coupling efficiency of the ferromagnetic particles [5,[19][20][21]. Therefore, the synthesis of C-S composite particles with few defects seems particularly important for obtaining SMCs with excellent properties.…”

Section: Introductionmentioning

confidence: 99%

Formation Process of the Integrated Core(Fe-6.5wt.%Si)@Shell(SiO2) Structure Obtained via Fluidized Bed Chemical Vapor Deposition

Cheng

Jia

et al. 2020

Metals

View full text Add to dashboard Cite

As electromagnetic functional materials, soft magnetic composites (SMCs) have great potential for applications in high-energy electromagnetic conversion devices. The most effective way to optimize the performance of an SMC is to incorporate it into insulated ferromagnetic core-shell particles with high structural uniformity and integrity. Fluidized bed chemical vapor deposition (FBCVD) is a facile and efficient technique for the synthesis of ferromagnetic/SiO2 core-shell particles. However, the formation mechanism and conditions of integrated ferromagnetic/SiO2 core-shell structures during the FBCVD process are not fully understood. On this basis, the formation process and the deposition time required for transformation of the Fe-6.5wt.%Si substrate into the Fe-6.5wt.%Si/SiO2 composite, and finally into the Fe-6.5wt.%Si/SiO2 core-shell structure, were investigated. Deposition of the insulative SiO2 coating onto the Fe-6.5wt.%Si particles was described by the three-dimensional island nucleation theory. The SiO2 islands were initially concentrated in rough areas on the Fe-6.5wt.%Si particle substrates owing to the lower heterogeneous nucleation energy. Deposition for at least 960 s was necessary to obtain the integrated ferromagnetic/SiO2 core-shell structure. The uniformity, integrity, and thickness of the insulative SiO2 coating increased with the increasing deposition time. The results in this study may provide a foundation for future kinetics investigations and the application of FBCVD technology.

show abstract

Enhanced AC magnetic properties of Fe-based soft magnetic composites coated with an electrically insulated SiO2–ZrO2 layer

Gao

et al. 2021

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

Influence of SiO2 insulation layers thickness distribution on magnetic behaviors of Fe-Si@SiO2 soft magnetic composites

Cited by 30 publications

References 36 publications

Recent Advances in Multi-Functional Coatings for Soft Magnetic Composites

Recent Advances in Multi-Functional Coatings for Soft Magnetic Composites

Formation Process of the Integrated Core(Fe-6.5wt.%Si)@Shell(SiO2) Structure Obtained via Fluidized Bed Chemical Vapor Deposition

Enhanced AC magnetic properties of Fe-based soft magnetic composites coated with an electrically insulated SiO2–ZrO2 layer

Contact Info

Product

Resources

About