• Title/Summary/Keyword: Fe-Si-B-Nb-Cu

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Crystalline Behavior and Microstructure Analysis in Fe73.28Si13.43B8.72Cu0.94Nb3.63 Alloy

  • Oh, Young Hwa;Kim, Yoon Bae;Seok, Hyun Kwang;Kim, Young-Woon
    • Applied Microscopy
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    • v.47 no.1
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    • pp.50-54
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    • 2017

  • The microstructure, the crystallization behavior, and magnetic properties of FeSi-based soft magnetic alloys (FINEMET) were investigated using transmission electron microscopy, X-ray diffraction, and coercive force measurements. The amorphous $Fe_{73.28}Si_{13.43}B_{8.72}Cu_{0.94}Nb_{3.63}$ alloys particles, prepared in $10^{-4}$ torr by gas atomization process, were heat treated at $530^{\circ}C$, $600^{\circ}C$, and $670^{\circ}C$ for 1 hour in a vacuum of $10^{-2}$ torr. Nanocrystalline Fe precipitation was first formed followed by the grain growth. Phase formation and crystallite sizes was compared linked to its magnetic behavior, which showed that excellent soft magnetic property can directly be correlated with its microstructure.

  • https://doi.org/10.9729/AM.2017.47.1.50 인용 PDF KSCI

The Effects of Insulating Materials on the Magnetic Properties of Nanocrystalline FeCuNbSiB Alloy Powder Cores (FeCuNbSiB 나노결정립 합금 분말코아의 자기적 특성에 미치는 절연체의 영향)

  • Noh, T.H.;Choi, H.Y.
    • Journal of the Korean Magnetics Society
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    • v.14 no.5
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    • pp.186-191
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    • 2004

  • The variation of magnetic properties with insulating materials(glass frits, talc and polyamide) in compressed powder cores composed of Fe$\sub$73.5/Cu$_1$Nb$_3$Si$\sub$15.5/B$\sub$7/ nanocrystalline alloy powders(size: 250～850 $\mu\textrm{m}$) and 3 wt% insulators has been investigated. Larger permeability was obtained at the frequency lower than 300～400 kHz for the powder cores including ceramic insulators(glass frits and talc) as compared to the cores with polyamide, while at higher frequency than 1 MHz the permeability of the former cores decreased rapidly. Further the cores with ceramic insulators showed larger core loss and smaller peak quality factor attained at lower frequency. On the contrary, the powder cores with polyamide exhibited high stability of permeabilities up to several MHz and superior core-loss and quality-factor properties. Moreover the dc bias property was better in the wide field range for the cores having polyamide. The enhanced magnetic properties of polyamide-added cores were attributed to the more sufficient electrical insulation between magnetic particles, where the higher insulation state was considered to be obtained from the larger volume fraction of polyamide in the powder cores.

  • https://doi.org/10.4283/JKMS.2004.14.5.186 인용 PDF KSCI

Ferromagnetic Resonance Study of a Nanocrystalline $Fe_{76}Cu_{1}Nb_{3}Si_{14}B_{6}$ Alloy (초미세결정합금 $Fe_{76}Cu_{1}Nb_{3}Si_{14}B_{6}$의 강자성공명 연구)

  • 이수형;김원태;장평우;김약연;임우영
    • Journal of the Korean Magnetics Society
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    • v.4 no.1
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    • pp.7-11
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    • 1994

  • Ferromagnetic resonance experiment was performed to study the variations of micromagnetic structure with heat treatment of melt spun $Fe_{76}Cu_{1}Nb_{3}Si_{14}B_{6}$ alloy for 1h at every $50^{\circ}C$ in the temperature range of $400^{\circ}C-700^{\circ}C$. The variations of micromagnetic structure was discussed qualitatively in terms of the variations of line width ${\Delta}H_{p-p}$ and resonance magnetic field $H_{res}$. With increasing armealing temperature to $400^{\circ}C$, ${\Delta}H_{p-p}$ decreases and $H_{res}$ increases due to the decrease in magnetic anisotropy resulting from structural relaxation during heat treatment. With increasing annealing temperature from 400 to $500^{\circ}C$, ${\Delta}H_{p-p}$ increases and $H_{res}$ decreases due to the increase in magnetic anisotropy resulting from the formation of nanocrystalline particles embedded in an amorphous matrix. With increasing armealing temperature from 500 to $550^{\circ}C$, ${\Delta}H_{p-p}$ decreases and $H_{res}$ increases due to the decrease in magnetic anisotropy resulting from the formation of homogeneous nanocrystalline structure with a minor amorphous phase. Further increase in armealing temperature above $550^{\circ}C$ C causes ${\Delta}H_{p-p}$ to increase and $H_{res}$ to decrease due to the increase in magnetic anisotropy due to the formation of inhomogeneous grain structure and intermetallic compounds.

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