Magnetic ceramics based on nanoparticles of cobalt and silicon oxide obtained from polycarbosilane

Popkov, O. V.; Potapova, Elizaveta; Yurkov, G. Yu.; Ovchenkov, E. A.; Щербакова, Г. И.; Zhigalov, D. V.

doi:10.1134/s2075113312050139

Cited by 3 publications

(4 citation statements)

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“…The production process may vary as a function of the technology: chemical [48], mechanical surface modification [49,50], and recently also additive manufacturing [44][45][46][47].…”

Section: Production Methods Of Silicon-coated Smcsmentioning

confidence: 99%

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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“…The production process may vary as a function of the technology: chemical [48], mechanical surface modification [49,50], and recently also additive manufacturing [44][45][46][47].…”

Section: Production Methods Of Silicon-coated Smcsmentioning

confidence: 99%

Recent Advances in Multi-Functional Coatings for Soft Magnetic Composites

et al. 2021

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show abstract

“…Prospective precursors for the preparation of the ceramic silicon-containing matrix include polycarbosilanes (PCS) [6,19]. Ceramics-producing polycarbosilanes have a branched structure, can fiberize and provide high yield of ultrafine ceramics (crystallites 10-20 nm in size) upon pyrolysis in an inert medium or vacuum (60-65% wt.).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…There are many methods for preparation of ferrite spinels, e.g. chemical precipitation, sol-gel processing, microemulsion route, sonochemistry, hydrothermal processing, aerosol-vapor methods, and high temperature decomposition of organic precursors [5][6][7][8][9][10].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…It requires readily available precursors and common chemical equipment and does not involve processes requiring pressures above 0. Cobalt ferrite (CoFe 2 O 4 ) nanoparticles were prepared using a colloidal chemistry technique [6]. A mixture of cobalt (II) acetylacetonate (2.5 mmol) and iron (III) acetylacetonate (5 mmol) with 60 mL of dioctyl ether was heated to 100°C for 0.5 h at modest stirring under argon flow in order to completely dissolve the reagents.…”

Section: Ceramics Preparationmentioning

confidence: 99%

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