Fabrication of Fe–Si–B based amorphous powder cores by cold pressing and their magnetic properties

Kim, Yoon B.; Jang, Dawon; Seok, Hyun‐Kwang; Kim, K.Y.

doi:10.1016/j.msea.2006.02.394

Cited by 61 publications

(10 citation statements)

References 7 publications

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“…Alternatively, to manufacture three-dimensional (3D) amorphous magnetic parts, powder metallurgy (PM), especially hot pressing and spark plasma sintering, has been extensively exploited [16][17][18]. To reduce the possibility of the deterioration of magnetic softness because of partial crystallisation in the amorphous matrix, it is necessary that consolidation behaviour and thermal stability of the glassy structure at elevated temperatures is controlled [19].…”

Section: Introductionmentioning

confidence: 99%

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Laser Additive Manufacturing of Fe-Based Magnetic Amorphous Alloys

Ozden

Morley

2021

Magnetochemistry

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Fe-based amorphous materials offer new opportunities for magnetic sensors, actuators, and magnetostrictive transducers due to their high saturation magnetostriction (λs = 20–40 ppm) and low coercive field compared with polycrystalline Fe-based alloys, which have high magnetostriction but large coercive fields and Co-based amorphous alloys with small magnetostriction (λs = −3 to −5 ppm). Additive layer manufacturing (ALM) offers a new fabrication technique for more complex net-shaping designs. This paper reviews the two different ALM techniques that have been used to fabricate Fe-based amorphous magnetic materials, including the structural and magnetic properties. Selective laser melting (SLM)—a powder-bed fusion technique—and laser-engineered net shaping (LENS)—a directed energy deposition method—have both been utilised to fabricate amorphous alloys, owing to their high availability and low cost within the literature. Two different scanning strategies have been introduced by using the SLM technique. The first strategy is a double-scanning strategy, which gives rise to maximum relative density of 96% and corresponding magnetic saturation of 1.22 T. It also improved the glassy phase content by an order of magnitude of 47%, as well as improving magnetic properties (decreasing coercivity to 1591.5 A/m and increasing magnetic permeability to around 100 at 100 Hz). The second is a novel scanning strategy, which involves two-step melting: preliminary laser melting and short pulse amorphisation. This increased the amorphous phase fraction to a value of up to 89.6%, and relative density up to 94.1%, and lowered coercivity to 238 A/m. On the other hand, the LENS technique has not been utilised as much as SLM in the production of amorphous alloys owing to its lower geometric accuracy (0.25 mm) and lower surface quality, despite its benefits such as providing superior mechanical properties, controlled composition and microstructure. As a result, it has been commonly used for large parts with low complexity and for repairing them, limiting the production of amorphous alloys because of the size limitation. This paper provides a comprehensive review of these techniques for Fe-based amorphous magnetic materials.

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Section: Introductionmentioning

confidence: 99%

“…Figure16. XRD patterns of the top surface (15 mm for substrate) and near substrate (0.8 mm from substrate) of LENS processed Fe-based BMGs compared to NSSHS7574 starting powder, illustrating that the amorphous alloys have a mixture of amorphous and crystalline phases (reprinted with the permission from[80], Elsevier, 2010).…”

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confidence: 99%

Laser Additive Manufacturing of Fe-Based Magnetic Amorphous Alloys

Ozden

Morley

2021

Magnetochemistry

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“…Representing a specific category of magnetic materials, soft magnetic powder cores (SMPCs) consisting of metallic magnetic particles, insulating layer, and binder have been found a wide utilization of energy, information, transportation, and defense [1][2][3][4]. There are several distinct advantages of SMPCs compared with ferrite soft magnetic materials such as high saturation magnetization, high resistivity, and low magnetic anisotropy, which make SMPCs more suitable for the miniaturization and integration of power electronic devices, thus are widely used as inductors, filters, chokes, and transformers.…”

Section: Introductionmentioning

confidence: 99%

Fe-6.5 wt%Si Powder Cores with Low Core Loss by Optimizing Particle Size Distribution

Huang

Jiao²,

Yu³

et al. 2020

Metals

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The effect of different particle size distribution of Fe-6.5 wt%Si powder on the microstructure and soft magnetic properties of the corresponding soft magnetic powder cores (SMPCs) was investigated. By optimizing particle size distribution, the density of SMPCs increased and the total core loss significantly decreased. According to the result of loss separation, density of SMPCs is inversely proportional to hysteresis loss, while with increasing the content of the fine particles, the eddy current loss significantly decreased. It was found that with magnetic powder of particle size-grading as 10%, 10%, 60%, and 20% for particles with size between −75 to +38, −38 to +23, −23 to +13, and −13 μm, respectively, the Fe-6.5 wt%Si SMPCs exhibit optimal comprehensive magnetic performances with the effective permeability of about 60, the percent permeability at 100 Oe is up to 70%, and the lowest core loss of 553 mW/cm3.

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“…Meanwhile, acid treated gas atomised amorphous powders have been found to exhibit good magnetic properties, with a stable permeability at high frequencies of up to 10 MHz 14. Powder cores composed of gas atomised powders and inorganic binders have also been found to exhibit stable permeability at these frequencies 15. Powder cores composed of water atomised powders exhibited remarkably enhanced magnetic properties relative to MPP (Fe–Ni–Mo) in the high frequency range 16,17.…”

Section: Introductionmentioning

confidence: 99%

Influence of various powder fabrication methods on magnetic properties of powder cores

Zhou

Peng

et al. 2013

Powder Metallurgy

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Fe 78?4 Si 9?5 B 9 Cu 0?6 Nb 2?5 alloy powder cores were made from powders prepared by the pulverisation of crystallised ribbons, atomisation and high energy ball milling after atomisation. The results showed that the saturation magnetisation of the three powders showed negligible variation. The coercivity was found to be strongly affected by the microstructure of the powder. Cores made from pulverised powder exhibited the largest m9 and core loss because of the small demagnetising field and large contact area caused by the flat shape of particles. In contrast, cores made from atomised powder exhibited the smallest m9 and core loss because of the large demagnetising field and small contact area. Cores made from milled powder exhibited an intermediate m' and core loss because of the change in powder shape caused by severe plastic deformation during ball milling.

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Fabrication of Fe–Si–B based amorphous powder cores by cold pressing and their magnetic properties

Cited by 61 publications

References 7 publications

Laser Additive Manufacturing of Fe-Based Magnetic Amorphous Alloys

Laser Additive Manufacturing of Fe-Based Magnetic Amorphous Alloys

Fe-6.5 wt%Si Powder Cores with Low Core Loss by Optimizing Particle Size Distribution

Influence of various powder fabrication methods on magnetic properties of powder cores

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