Regulation and control of insulated layers for intergranular insulated Fe/SiO2 soft magnetic composites

Wang, Jian; Fan, Xiaoliang; Wu, Zhaoyang; Li, Guangqiang

doi:10.1007/s10853-017-0941-9

Cited by 27 publications

(3 citation statements)

References 29 publications

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“…An annealing process reduces P cv of SMCs cold sintered from FeCuNbSiB@gel or FeCuNbSiB@solid particles due to the [11][12][13]16,18,[37][38][39][40][41][42][43][44][45] e) The maximum quality factor (Q max ) and corresponding frequency for the cold sintered SMCs from the FeCuNbSiB@solid particles for addition contents of x = 1.0-6.0 wt% (this work) with comparison to the conventional SMCs. [12,14,38,39,[46][47][48] The performance of SMCs with or without a 500 °C annealing is included. f) Real (εʹ) and imaginary (εʺ) parts of relative complex permittivity with frequency dependence.…”

Section: Wwwadvelectronicmatdementioning

confidence: 99%

Cold Sintered Metal–Ceramic Nanocomposites for High‐Frequency Inductors

Zhou

Liu

Cao

et al. 2020

Adv Elect Materials

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Power electronics, including those inspired by 5G and 6G revolutions, have escalated the demand for miniaturized energy‐efficient inductor components with higher power density, higher operating frequencies, and smaller device sizes. Recently, cold sintering has proved to be a powerful tool for fabricating ceramics. Here, novel metal–ceramic nanocomposites are prepared by cold sintering for the first time. As a model system, Fe‐based nanocrytalline alloys with NiZn ferrites and α‐Fe2O3 ceramics are cold sintered at 150 °C under a uniaxial pressure of 320 MPa. These nanocomposites illustrate dense microstructures, fine grains, and high electrical resistivities, allowing remarkable high‐frequency performance, such as permeability values of ≈11.5 at frequencies up to ≈1 GHz with corresponding quality factors reaching over 100 at tens of megahertz. The power inductors using the developed composite materials demonstrate low DC resistance (18.35 mΩ), high efficiency (≈98.2%), and high current rating with small form factors far superior to those available as commercial products. The results presented here indicate a dramatic advance in the materials science and development of inductor composite materials for power electronics applications. This synthesis route of metal–ceramic composites shows great potential in fabrication of new composite materials that are targeted for functional components.

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Section: Wwwadvelectronicmatdementioning

confidence: 99%

Cold Sintered Metal–Ceramic Nanocomposites for High‐Frequency Inductors

Zhou

Liu

Cao

et al. 2020

Adv Elect Materials

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“…For an arbitrary composite, if enough geometry information, noted N, is given, the effective permeability can be obtained as a function of the geometry information and the properties of the constituents:lðl 1 ; l i ; NÞ. The shape factor K(N) can be obtained from (6) or as in Ref. 16, considering simplified basic shapes for the inclusions.…”

Section: Extension To More Generic Microstructuresmentioning

confidence: 99%

“…1 In recent research works on SMCs, the typical grain size is of the order of 100 lm, 2-5 but many efforts are devoted to reduce it. [6][7][8] Modeling completely such materials, including their microstructure, in a numerical design tool is usually impossible due to the large scale difference between the gain size and the typical device size. For such multi-scale problems, the use of homogenization strategies is a preferable choice to describe the macroscopic behavior.…”

Section: Introductionmentioning

confidence: 99%

Bounds and estimates on eddy current losses in soft magnetic composites

Ren

Corcolle

Daniel

2018

Journal of Applied Physics

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Soft Magnetic Composites can be considered as a periodic pattern of circular fibers or spheres inside a matrix. In this paper, lower and upper bounds for eddy current (EC) losses are analytically deduced for these types of microstructures. Bounds are obtained from simple magnetic field averaging operations within the inclusions. The averaging manipulations rely on the determination of the effective permeability of the composite, which can be estimated using a homogenization strategy. Lower and upper estimates of EC losses are then obtained for more generic microstructures based on the definition of this effective permeability. Results are compared to Finite Element calculations. The model is then validated with experimental results from the literature.

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