The effects of field annealing on the magnetic properties of FeSiB amorphous powder cores

Dong, Yaqiang; Li, Zichao; Liu, Min; Chang, Chuntao; Li, Fushan; Wang, Xinmin

doi:10.1016/j.materresbull.2017.04.030

Cited by 39 publications

(7 citation statements)

References 26 publications

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“…This supplemented the density of the N/C HSMCs, and consequently, the internal chain structure could be rebuilt in a more integrated fashion, as well as significantly increasing the magnetic permeability. Subsequently, a new type of air gap with smaller volume produced by the increasing mass fraction of the CIP, resulting in large porosity, which could prevent the propagation of domain movement among the particles in the magnetizing process and reducing the permeability [16]. Moreover, the relaxation frequency continued to move to high frequency with the increased mass fraction of the CIP; all specimens exhibited excellent highfrequency stability up to approximately 1 MHz, or more.…”

Section: Resultsmentioning

confidence: 99%

Enhanced magnetic properties of Fe-based nanocrystalline composites by addition of carbonyl iron powders

et al. 2019

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Fe-based nanocrystalline/carbonyl iron hybrid soft magnetic composites (N/C HSMCs) with excellent comprehensive magnetic properties were fabricated by cold compaction of gas-atomized FeSiBPNbCu amorphous powder and carbonyl iron powder (CIP). Upon annealing at the optimum temperature, the N/C HSMCs demonstrated excellent magnetic properties including a high permeability range from 104 to 124, high-frequency stability up to 1 MHz, superior DC-bias permeability increase from 58 to 86% at a bias field of 50 Oe, and low core loss that regulated less than 1200 mW/cm 3 and reduced to as low as 732 mW/cm 3 at 100 kHz for B m = 0.1 T. The ameliorative magnetic properties of the present N/C HSMCs can be attributed to the addition of CIP, which typically enhances the monolithic saturation magnetic flux density and rebuilds the chain structures in a more integrated formation. Further, the precipitation of an ultrafine α-Fe(Si) phase in the amorphous matrix and a uniform insulation layer covered with the powder were the foundation for numerous other superior performance results.

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Section: Resultsmentioning

confidence: 99%

Enhanced magnetic properties of Fe-based nanocrystalline composites by addition of carbonyl iron powders

et al. 2019

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“…Up to now, many Fe-B-based amorphous alloy powders have been successfully prepared by gas atomization [21][22][23][24]. However, atomized Fe-W-B amorphous powder with high content of W and B has not been prepared and studied to the best of our knowledge.…”

Section: Of 11mentioning

confidence: 99%

Crystallization of Fe-W-B Amorphous Powder Prepared by Gas Atomization

Ma¹,

Zheng²,

Wang³

et al. 2022

Metals

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In this work, the effects of master alloy composition and annealing temperature on the amorphization and crystallization behavior of Fe-W-B powders prepared by gas atomization using compacts of Fe, W and B powder mixture were systematically studied. The results show that only the master alloy with high content of W (19.9 at.%) and B (13.6 at.%) of the six alloys studied yielded amorphous Fe-W-B powders. The alloying elements W and B are believed to have a glass-forming ability (GFA)-enhancing effect, which together with the high cooling rate of gas atomization leads to the formation of amorphization. The difference in the average particle size of 3–10 μm for the six atomized powders indicates that the master alloys with different W and B contents have different superheat and melt viscosity at the same atomization temperature. The Fe-W-B amorphous powder is structurally stable within 600 °C and crystallizes from the edge of the particles when the temperature increases to 700 °C, and its crystalline precipitates include α-Fe, FeWB and Fe7W6. The nuclear shielding tests and Monte Carlo N Particle Transport Code (MCNP) calculated results revealed that the Fe-W-B amorphous powder has a much better shielding performance for γ-rays and neutrons than that of iron. This work provides an efficient strategy for fabricating Fe-W-B amorphous powder with promising nuclear shielding potential and sheds light on the crystallization behaviors of this alloy.

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“…At x = 1.0 wt%, all samples show a low P cv except for Gel-CS ( Figure S12, Supporting Information). 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.…”

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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The effects of field annealing on the magnetic properties of FeSiB amorphous powder cores

Cited by 39 publications

References 26 publications

Enhanced magnetic properties of Fe-based nanocrystalline composites by addition of carbonyl iron powders

Enhanced magnetic properties of Fe-based nanocrystalline composites by addition of carbonyl iron powders

Crystallization of Fe-W-B Amorphous Powder Prepared by Gas Atomization

Cold Sintered Metal–Ceramic Nanocomposites for High‐Frequency Inductors

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