Enhanced magnetic properties and reduced core loss of intergranular insulating Fe-Si soft magnetic composites with three-shell SiO2-Fe2SiO4-SiO2 insulating layer

Luo, Zigui; Fan, Xiaoliang; Hu, Wentao; Luo, Fan; Li, Yawei; Wang, Jian; Liu, Xin

doi:10.1016/j.jssc.2018.11.034

Cited by 26 publications

(3 citation statements)

References 25 publications

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“…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%

“…In addition, silica is already adopted in different industrial sectors as an electrically insulating material and also presents important characteristics related to microstructure and thermal stability. For these reasons, it can be used as an inorganic coating to cover the magnetic powder by means of nanocomposite sized particles or as silica coating compound together with phosphates and other oxides for ferromagnetic materials [28,[30][31][32]. Moreover, the coating system based on SiO 2 represents a solution to the problem caused by organic layers, which decompose at high temperatures, making annealing and heat treatments very limited and impossible at temperatures over 500 • C [33][34][35][36].…”

Section: Silicamentioning

confidence: 99%

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Recent Advances in Multi-Functional Coatings for Soft Magnetic Composites

et al. 2021

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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.

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Section: Production Methods Of Silica-coated Smcsmentioning

confidence: 99%

Section: Silicamentioning

confidence: 99%

Recent Advances in Multi-Functional Coatings for Soft Magnetic Composites

et al. 2021

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“…The performance of FeSiAl soft magnetic composites is influenced by the original powder properties, insulation cladding method, press molding, and heat treatment process [1,13], among which the insulation cladding process is the key process that determines the magnetic permeability, DC superposition resistance, and loss performance of the cores, which is the focus of current research in the industry [14]. The commonly used insulation cladding methods include inorganic cladding and organic cladding.…”

Section: Introductionmentioning

confidence: 99%

Structure and magnetic properties of FeSiAl-based composites with the compound passivation agent

Tong,

Li,

Qian

et al. 2024

Phys. Scr.

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FeSiAl soft magnetic composites (SMCs), which are widely used in electromagnetic applications, have good electromagnetic characteristics. To reduce their core loss, the current research focuses on improving the properties of insulating coating materials. In this work, different contents of phosphoric acid and chromic acid compound passivating agents are used to prepare the insulation coating of FeSiAl powder. The results revealed that the surface film layer of the powder coating with the compound passivation agent is relatively smooth, and the film layer is too thin to be detected by XRD. With the increase of the amount of passivating agent, the permeability of powder decreases gradually and the performance of anti-DC-Bias loading improved. The core loss shows a trend that it decreases first and then increases with the increase of passivating agent dosage. If the amount of passivator is too much, the core loss will increase rapidly. When a 2% passivator is used, the magnetic permeability of the powder is 72, the DC-Bias characteristic is 51.3% with 100 Oe, and the core loss is 57 mW/cm3 at 100 kHz and 50 mT.

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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

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Enhanced magnetic properties and reduced core loss of intergranular insulating Fe-Si soft magnetic composites with three-shell SiO2-Fe2SiO4-SiO2 insulating layer

Cited by 26 publications

References 25 publications

Recent Advances in Multi-Functional Coatings for Soft Magnetic Composites

Recent Advances in Multi-Functional Coatings for Soft Magnetic Composites

Structure and magnetic properties of FeSiAl-based composites with the compound passivation agent

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

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