• 제목/요약/키워드: NiZnCu ferrite

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Finite Element Analysis of Combustion Reaction on Iron and Metal Oxides Interface (Fe-금속 산화물 계면에서 연소반응의 유한 요소해석)

  • Gu, Mun-Seon;Choe, Yong
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2017.05a
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    • pp.118.2-118.2
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    • 2017
  • Combustion behavior of Fe, CuO, NiO, ZnO and $Fe_2O_3$ powder mixture was carried out by finite element method (FEM) to understand a reaction at iron and metal oxide interface. The FEM was done by using ANSYS Fluent 17.0. Initial and boundary conditions are 1 atmosphere, room temperature, 0.1MPa of oxygen partial pressure, $T_{S1}=1127^{\circ}C$, $T_{S2}=327^{\circ}C$ for a cylindrical shape specimen with dia. $35{\times}80$ [mm]. The maximum combustion temperature is $1537^{\circ}C$ for the condition of conduction, convection and radiation. The combustion temperature and rate are about $847^{\circ}C$ and 3.9mm/sec, respectively. The combustion wave is enough to make ternary ferrite phase like $CuNiZnFe_2O_3$.

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A Study on the Electromagnetic Property of NiCuZn Ferrite by Additive SnO2, CaO. (SnO2, CaO가 NiCuZn Ferrite의 전자기적 특성에 미치는 영향 연구)

  • Kim, Hwan-Chul;Koh, Jae-Gui
    • Journal of the Korean Magnetics Society
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    • v.13 no.3
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    • pp.121-126
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    • 2003
  • The electromagnetic properties and microstructures of the basic composition of (N $i_{0.2}$C $u_{0.2}$Z $n_{0.6}$)$_{1.085}$(F $e_2$ $O_3$)$_{0.915}$ were invested by changing of the additive Sn $O_2$, CaO amounts and ferrite processes. There is no variation of grain size by changing additive amount. It can reduce the total loss when (N $i_{0.2}$C $u_{0.2}$Z $n_{0.6}$)$_{1.085}$(F $e_2$ $O_3$)$_{0.915}$ composition sintered at 1150 $^{\circ}C$ better than 130$0^{\circ}C$. Additive CaO confirmed of useful addition for the reduce total loss, because it increasing sintering density. Decreasing total loss were observed by adding both Sn $O_2$ 0.06 wt% and CaO 0.4 wt%.

Electric and Magnetic Properties of NCZF for High Frequency Chip-Inductor (고주파 Chip-Inductor용 NCZF 전자기적 특성)

  • 정승우;김태원;김성수;백승철;최우성
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1999.05a
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    • pp.80-83
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    • 1999
  • We have studied properties(crystal structure, density, absorption, contraction, initial permeability, and permeability) of Ni$_{0.175-x}$Cu$_{x}$Zn$_{0.33}$Fe$_{0.495}$ (x=0~0.175) ferrites with various NiO and CuO, because of development of materials for high frequency inductor. The XRD peaks of all of samples were observed only spine이 phase. As a results of the density, absorption rate, and shrinkage rate, the grain growth progressed rapidly in x=0.1 at 95$0^{\circ}C$, x=0.075 at 105$0^{\circ}C$, and x=0.025 at 115$0^{\circ}C$ for 3 hours. Initial permeability increased with increasing CuO concentration until x=0.1, and then decreased. The complex permeability as a function frequency were high values at sintered 105$0^{\circ}C$ fotr3 hours in x=0.075, 0.1., 0.1.1.

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A Study on the Development of High Permeability and Low Coercivity Ni-Zn Ferrite (고투자율, 저보자력을 갖는 Ni-Zn Ferrite의 개발에 관한 연구)

  • 고재귀
    • Journal of the Korean Magnetics Society
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    • v.7 no.1
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    • pp.13-18
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    • 1997
  • The effects of the various raw material composition and sintered temperature on the physical properties of Ni-Zn ferrite have been investigated. They turned out to be spinel structure by X-ray diffraction and the size of grain from microscope was from 6 ${\mu}{\textrm}{m}$ to 16 ${\mu}{\textrm}{m}$. As the sintering temperature was increased from 1030 $^{\circ}C$ to 1070 $^{\circ}C$, the initial permeability and magnetic induction has increased and the both of Q factor and coercive force has decreased. The coercive force and curie temperature were almost the same at each specimen. Their values were about 0.20 Oe and 220 $^{\circ}C$. The frequency of specimen will used in the range from 400 kHz to 20 MHz. The basic composition of $Ni_{0.14}Zn_{0.64}Cu_{0.22}Fe_2O_4$ (specimen B) sintered at 1050 $^{\circ}C$ shows the best results at magnetic induction($B_r & B_m$).

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Property Changes of Chip Inductors by Varying the Solid Loading of Ferrite Pastes (페라이트 페이스트의 고체함량에 따른 칩 인덕터의 특성변화)

  • 손승현;제해준;김병호
    • Journal of the Korean Ceramic Society
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    • v.36 no.3
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    • pp.284-292
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    • 1999
  • 고체함량을 변화시킨 NiCuZn 페라이트 페이스트를 사용하여 스크린 인쇄법으로 7.7$\times$4.5$\times$1.0 nm 크기의 칩인덕터를 제조한 후, 페라이트 페이스트의 고체함량에 따른 수축률, 소결밀도, 미세구조, 계면반응 등의 물리적 특성 및 자기적 특성 변화를 분석하였다. 조온소결을 위하여 attrition milling 공정을 통하여 미세분말을 준비하였으며, 소결온도는 880~94$0^{\circ}C$로 변화시켰다. 90$0^{\circ}C$에서 2시간 열처리된 페라이트 후막의 소결밀도는 고체함량이 50,55,60%로 증가할수록 5.12,5.14,5.18g/㎤로 증가하였으며, 이에 따라 칩 인덕터 시편들의 주파수 10 MHz에서 L값이 2.1,2.3,2.5 $\mu$H로 커졌다.Q값은 소결밀도 증가에 의한 Q값 증가효과와 아울러 입자가 커짐에 따른 반대효과로 인하여 고체함량에 따라 87,90,94로 큰 변화가 없었다. 페라이트 페이\ulcorner의 고체함량 및 소결온도와 무관하게 Ag 성분의 페라이트 쪽으로의 확산현상은 나타나지 않았다.

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Effect of Additives on Electromagnetic Properties in EMI Noise Filters for High Frequency Region (고주파 대역 EMI 노이즈 필터 제조시 전자기적 특성에 미치는 첨가물 효과)

  • 박진채;김병호;김왕섭;김경용
    • Journal of the Korean Ceramic Society
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    • v.29 no.8
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    • pp.639-645
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    • 1992
  • Effects of additives on electromagnetic properties of a Ni-Cu-Zn ferrite for a noise filter in high frequency regions were studied. Both resistivity and permeability were increased with the amount of Mn2O3 up to 1wt%, then decreased with further addition. Addition of Co2O3 decreased the permeability of the ferrite and shifted the resonance frequency to a higher frequency region, which was thought due to the stabilization of domain walls. Therefore it was possible to improve both the permeability and the loss and to control the cut-off frequency by the concurrent addition of Mn2O3 and Co2O3.

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Optimized Design of Low Voltage High Current Ferrite Planar Inductor for 10 MHz On-chip Power Module

  • Bae, Seok;Hong, Yang-Ki;Lee, Jae-Jin;Abo, Gavin;Jalli, Jeevan;Lyle, Andrew;Han, Hong-Mei;Donohoe, Gregory W.
    • Journal of Magnetics
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    • v.13 no.2
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    • pp.37-42
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    • 2008
  • In this paper, design parameters of high Q (> 50), high current inductor for on-chip power module were optimized by 4 Xs 3 Ys DOE (Design of Experiment). Coil spacing, coil thickness, ferrite thickness, and permeability were assigned to Xs, and inductance (L) and Q factor at 10 MHz, and resonance frequency ($f_r$) were determined Ys. Effects of each X on the Ys were demonstrated and explained using known inductor theory. Multiple response optimizations were accomplished by three derived regression equations on the Ys. As a result, L of 125 nH, Q factor of 197.5, and $f_r$ of 316.3 MHz were obtained with coil space of $127\;{\mu}m$, Cu thickness of $67.8\;{\mu}m$, ferrite thickness of $130.3\;{\mu}m$, and permeability 156.5. Loss tan ${\delta}=0$ was assumed for the estimation. Accordingly, Q factor of about 60 is expected at tan ${\delta}=0.02$.

Preparation and Characterization of Nanocrystalline Spinel Ferrites by Chemical Co-precipitation (화학적 공침법을 이용한 침상형 페라이트 합성)

  • Shen, Jiao-Wen;Lim, Yun-Hui;Jo, Young-Min
    • Applied Chemistry for Engineering
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    • v.22 no.2
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    • pp.185-189
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    • 2011
  • In this work, nano-sized M-ferrites (M=Co, Ni, Cu, Zn) for the decomposition of carbon dioxide were synthesized by the chemical co-precipitation. From the thermogravimetric analysis, it was clear that the maximum weight loss of each sample took place below $350^{\circ}C$. High temperature calcination resulted in more systematic crystallines, smaller specific surface area and larger particle size. An analysis by FTIR in the range of $375{\sim}406cm^{-1}$ revealed the presence of chelates at the octahedral site, which implies the formation of spinel structure in the ferrites. The current work showed that a $500^{\circ}C$ is the optimum heat treatment temperature of metal ferrites for $CO_2$ decomposition reaction.