SiO2 nanoparticles enhanced silicone resin as the matrix for Fe soft magnetic composites with improved magnetic, mechanical and thermal properties

Wu, Chen; Huang, Maoqin; Luo, Dahao; Jiang, Yinzhu; Yan, Mi

doi:10.1016/j.jallcom.2017.12.322

Cited by 55 publications

(9 citation statements)

References 28 publications

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“…SiO 2 can be used as an inorganic coating for soft magnetic composites, especially as amorphous silica. Silica gel and aerogels are made of silica too, and they can be used to improve the coating process [26][27][28][29]. 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.…”

Section: Silicamentioning

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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Section: Silicamentioning

confidence: 99%

Recent Advances in Multi-Functional Coatings for Soft Magnetic Composites

et al. 2021

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“…Recently, high-performance polymers have developed rapidly. Several strategies for individually enhancing certain properties of materials have emerged; these include adding high strength inorganic nanoparticles and flame retardants to enhance the mechanical strength and flame retardancy, [33][34][35][36][37][38][39][40][41][42] and introducing sulfur, phosphorus atoms and benzene rings to improve refractive index. [43][44][45][46] Sulfur-containing and phosphorus-nitrogen-containing polymers have been extensively developed due to the inherent excellent optical and flame-retardant properties of phosphorus, sulfur and nitrogen.…”

Section: Introductionmentioning

confidence: 99%

Enhancing mechanical, thermal property and flame retardancy of optical polythiourethane with self‐assembly phosphazene nanoparticles

2022

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Polythiourethane (PTU) has attracted considerable attention in engineering building materials. Here, based on phosphazene nanoparticles (PZS‐1 and PZS‐2) prepared by water‐triggered and ultrasonic self‐assembly method, phosphazene/polythiourethane (PZS/PTU) composites with excellent mechanical strength, high flame retardancy and good transparency was obtained. Then, the comprehensive properties of both composites were evaluated, where PZS‐2 endowed PTU with better overall performance. Due to the good dispersibility of PZS and its strengthed interfacial interaction with PTU matrix, both PZS significantly enhanced mechanical and thermal property of PTU, where the tensile strength and glass transition temperature of PZS/PTU composites reached to 84.34 MPa and 59.94°C respectively. More importantly, compared to pure PTU, the values of peak heat release rate (HRR), total heat release rate (THR), smoke production rate (SPR), and total smoke production (TSP) of composites were decreased by 10.5%, 13.3%, 30.6% and 18.0%, respectively. The limiting oxygen index of composites was improved to 21.39% due to the catalytic carbonization of PZS, the expanded carbon layer and the incombustible gases released during combustion. Meanwhile, the PZS/PTU composite exhibited the high refractive index of 1.6580 and good transparency (not less than 85% at 500 nm). The PZS/PTU composite was promising candidates for optical flame retardant coatings and engineering building materials.

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“…The addition of inorganic fillers (such as SiO 2 , 20 Al 2 O 3 , 21,22 graphene 23 and carbon nanotubes 24 ) is a simple and practical method to improve the thermal stability of silicone resins. However, the agglomeration of inorganic particles in the resin matrix may lead to inhomogeneous dispersion and phase separation.…”

Section: Introductionmentioning

confidence: 99%