Fe-Si-B-P-C-Cu nanocrystalline soft magnetic powders with high <i>B</i>
                  <i>s</i> and low core loss

Takahashi, Toru; Yoshida, Katsumi; Shimizu, Y.; Setyawan, Albertus D.; Bito, Mitsuo; Abe, Masanori; Makino, Akihiro

doi:10.1063/1.4978408

Cited by 15 publications

(5 citation statements)

References 11 publications

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“…The specific values are shown in Table 1. It is found that the sphericity of the powders prepared by the SWAP method was worse than gas-atomized powders [10,12,17,18]. This difference is mainly due to the different surface tension and water jet interaction modes during the solidification of the smelt droplets in different preparation processes [17,18].…”

Section: Amorphous Forming Ability and Thermal Stability Of As-swaped...mentioning

confidence: 97%

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Fabrication and Soft Magnetic Properties of Fe81.3Si4B10P4Cu0.7 Amorphous Powders by Using the Spinning-water Atomization Process

Dan

et al. 2022

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Soft magnetic Fe81.3Si4B10P4Cu0.7 powders have been fabricated by using spinning-water atomization process (SWAP) under the water pressure of 17.5 MPa and gas pressure of 2 MPa. To clarify the amorphous forming ability, thermal stability, and the corresponding soft magnetism, the as-SWAPed powders have been sieved into 6 groups with different powder sizes from 0 – 150 μm. After the analysis of the amorphous and crystalline characteristics, the morphology, and soft magnetic properties of these 6 groups of as-SWAPed powders, it is concluded that the SWAPs with a high cooling rate of 105 K/s can improve the amorphous forming abilities of Fe81.3Si4B10P4Cu0.7 powders up to 53 μm, the saturated magnetic flux density as high as 170 – 173 emu/g and the thermal stabilities higher than 112.8 K. The characteristic parameters of as-SWAPed powders above mentioned are close to those of the counterpart rapid solidified ribbons. The surface oxide layers on as-SWAPed powders mainly consist of Fe2O3, and are 10 nm thick, much thicker than these counterpart ribbons, which might help to weaken the eddy effects accompanying with the slight decrease of the saturated magnetic flux density. Due to the higher cooling rates of SWAPs than gas atomization processes and the better spheroidization of powders for SWAPs than water atomization processes, it is key for NANOMET® family alloys to increase their amorphous forming abilities and better the soft magnetic performances.

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Section: Amorphous Forming Ability and Thermal Stability Of As-swaped...mentioning

confidence: 97%

“…This could be caused by the heat transfer and heat accumulation inside the center [5,9,17,18]. The FIB-SEM images (Fig.…”

Section: Crystalline States and Soft Magnetic Properties Of As-swaped...mentioning

confidence: 99%

Fabrication and Soft Magnetic Properties of Fe81.3Si4B10P4Cu0.7 Amorphous Powders by Using the Spinning-water Atomization Process

Dan

et al. 2022

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“…Soft magnetic materials have been attracting increasing attention as core products in various devices, such as communication equipment, power generation equipment, power conversion parts and electromagnetic wave shielding parts [1][2][3][4][5][6]. Recently, amorphous materials have also received considerable research attention because of their extremely low coercivity, high permeability and low core loss at a high frequency [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Computational approach to increasing the packing fraction of amorphous powders

et al. 2021

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The powder packing behaviour of Fe-based amorphous powders was experimentally monitored and compared with values predicted using the Desmond model and a simulation based on the discrete element method. Powders with different sizes were mixed in various ratios to produce a tri-modal distribution. The simulation results revealed the cohesive force of the powder in terms of the angle of repose and were in agreement with the experimental results. However, the packing behaviour derived from the theoretical model deviated from the experimental results because the interaction among the powder was not considered in the former. Furthermore, the packing fractions for different mixing ratios were investigated through an artificial intelligence framework to determine the optimal mixing ratio. This ratio was validated experimentally and determined to be approximately 8.97% higher than that for the monodisperse large powder case.

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“…The conventional method to cover this shortage is to increase the Fe content [5,6]. High Fe-content alloys like FeSiBPCu [7,8] and FeSiBPCuC [9,10] have been developed one after another. However, the H c of high Fe-content alloys increases rapidly during annealing at a low heating rate due to the rapid crystallization of α-Fe on pre-existing nuclei [11].…”

Section: Introductionmentioning

confidence: 99%

Effects of Nb Addition and Heat Treatment on the Crystallization Behavior, Thermal Stability and Soft Magnetic Properties of FeSiBPCuC Alloys

Fan¹,

Yang²,

Xu³

et al. 2020

J. Korean Phys. Soc.

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In this paper, the effect of the replacement of Fe by Nb on the glass forming ability (GFA), the thermal stability and the crystallization behavior of Fe84.5−xSi0.5B10.5P3.5Cu0.7C0.3Nbx (x = 0, 1, 2) alloys were investigated. The results show that the addition of Nb increases the GFA. Increasing Nb content can enhance the first onset crystallization temperature (Tx1), the second onset crystallization temperature (Tx2) and ΔTx (ΔTx = Tx2 − Tx1), which broadens the range of annealing temperatures. The coercivity (Hc) of ribbons decreases with increasing Nb content after annealing at a low heating rate and reach as a minimum of 24.5 A/m when the Nb content is 2 at.%. The process of annealing at a high heating rate distinctly decreases Hc, and all samples present excellent soft magnetic properties. The nanocrystalline alloy exhibits the lowest Hc of 6.4 A/m after annealing at 460 • C for 5 min.

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Fe-Si-B-P-C-Cu nanocrystalline soft magnetic powders with high B s and low core loss

Cited by 15 publications

References 11 publications

Fabrication and Soft Magnetic Properties of Fe81.3Si4B10P4Cu0.7 Amorphous Powders by Using the Spinning-water Atomization Process

Fabrication and Soft Magnetic Properties of Fe81.3Si4B10P4Cu0.7 Amorphous Powders by Using the Spinning-water Atomization Process

Computational approach to increasing the packing fraction of amorphous powders

Effects of Nb Addition and Heat Treatment on the Crystallization Behavior, Thermal Stability and Soft Magnetic Properties of FeSiBPCuC Alloys

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