• Title, Summary, Keyword: Ni-Zn-Cu ferrite

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The Prodessing Control of NiCuZn Ferrite(II) - The Relationship between Initial Permeability and Bulk Density of NiCuZn Ferrite as Functions of Forming Pressure and Sintering Temperature. (NiCuZn Ferrite의 제조공정 제어(제2보) - 성형압력 및 소성온도 변화에 따른 초기투자율과 겉보기밀도에 관한 고찰)

  • 류병환;김선희;최경숙;고재천
    • Journal of the Korean Magnetics Society
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    • v.5 no.6
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    • pp.937-946
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    • 1995
  • In this research, the processing control of NiCuZn Ferrite has been developed. The relationship between initial permeability and bulk density of NiCuZn Ferrite with processing factors was studied. NiCuZn Ferrite, which calcinated at $700^{\circ}C$ for 3 hours, was ball milled for about 60 hours to make a size of $0.5\mu\textrm{m}$ followed by granulation using spray dryer. The physical properties and the magnetic properties of NiCuZn Ferrite were investigated with the processing factor, such as (i) granule size and forming pressure, and (ii) sintering temperature. The green density of NiCuZn Ferrite was largely depended on the forming pressure rather than its granule size. The green density of NiCuZn Ferrite was increased from $2.484\;g/cm^{3}$ to $3.002\;g/cm^{3}$ with increase in forming pressure. The bulk density of NiCuZn Ferrite was increased from $3.470\;g/cm^{3}$ to $4.754\;g/cm^{3}$ linearly with increase in sintering temperature. The relationship between initial permeability and bulk density of NiCuZn Ferrite was expressed with the empirical equation,$\mu_{i}=a+b_{\rho}+c_{\rho}^2$ at forming pressure and sintering temperature.

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The Effect of Composition on the Properties of NiCuZn ferrites (NiCuZn ferrite의 특성에 미치는 조성의 영향)

  • 남중희;정현학;신재영;오재희
    • Journal of the Korean Magnetics Society
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    • v.5 no.3
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    • pp.191-196
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    • 1995
  • NiCuZn ferrites were prepared by a solid-state reaction and sintered at $900^{\circ}C$ for 5 hours. Its properties were investigated by controlling the ferrite composition and processing. NiCuZn ferrite with a composition of ${(Ni_{0.2}Cu_{0.2}Zn_{0.6}O)}_{1.02}{(Fe_{2}O_{3})}_{0.98}$ was found to have the maximum initial permeability as a result of the variation of Cu content and the (Ni+Cu)/Zn ratio. Curie temperature($T_{c}$) of NiCuZn ferrite was decreased with the larger Cu content and increased with the larger Ni content. NiCuZn ferrites of ${(Ni_{0.2}Cu_{0.2}Zn_{0.6}O)}_{1-w}{(Fe_{2}O_{3})}_{1+w}$ composition milled for 20~80 hours had the maximum initial permeability at w=-0.015 and Curie temperature ($T_{c}$) was decreased with the increasing of $Fe_{2}O_{3}$ deficiency(w).

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The Characteristics of Hetero Junction Using NiCuZn Ferrite and Dielectric for LTCC (LTCC를 위한 NiCuZn 페라이트계와 유전체의 이종접합의 특성)

  • Kim, Nam Hyun;Park, Hyun;Kim, Kyung Nam
    • Journal of the Korean institute of surface engineering
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    • v.45 no.5
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    • pp.188-192
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    • 2012
  • The hetero junction on dielectrics and ferrite for LTCC was prepared by using NiCuZn ferrite. The shrinkage behaviour of ferrite tapes in combination with a dielectric tape was investigated. The characteristics of NiCuZn ferrite were investigated using XRD (X-ray diffractometer), Dilatometer, FE-SEM (Field emission scanning electron microscope), EDS (Energy dispersive spectrometer). NiCuZn ferrite calcined at $700^{\circ}C$ had a good apparent density and initial permeability of magnetic properties. The shrinkage rate of the NCZF700 ferrite and dielectric material was similar. The multilayer revealed dense, uniform morphologies with excellent interface quality. Diffusion of hetero junction such as dielectric and ferrite was not occuring at $900^{\circ}C$.

The Variation of Permeability and$Q_{max}$ Frequency with Processing Parameters in NiCuZn Ferrites (제조 공정 Parameter에 따른 NiCuZn Ferrite의 투자율과 $Q_{max}$ 주파수 변화)

  • 신재영;박지호;박진채;한종수;송병무
    • Journal of the Korean Magnetics Society
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    • v.7 no.1
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    • pp.19-24
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    • 1997
  • Composition and process conditions for low temperature sintered NiCuZn ferrites were investigated, so as to fabricate multilayered chip inductor. The$Fe_2O_3$ deficiency for low temperature sintering was decreased with NiO contents of NiCuZn ferrites. The permeability of NiCuZn ferrites can be controlled in the range of 12~562 with the variation of NiO and $Co_3O_4$ contents. The $Q_{max} $ frequency of NiCuZn ferrites was decreased from 50 MHz to 3 MHz linearly with permeability increase from 60 to 560. The relation between the $Q_{max}$ frequency(Y) and permeability(X) of NiCuZn ferrites was expressed with the following empirical equation, logY=4.2-1.4logX.

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Synthesis of Nano-sized NiCuZn-ferrites for Chip Inductor and Properties with Calcination Temperature (칩인덕터용 NiCuZn-ferrites 나노 분말합성 및 하소 온도에 따른 특성 변화)

  • 허은광;김정식
    • Journal of the Korean Ceramic Society
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    • v.40 no.1
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    • pp.31-36
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    • 2003
  • In this study, nano-sized NiCuZn-ferrites for the multi-layered chip inductor application were prepared by a coprecipitation method and its electromagnetic properties were analyzed. Also, the property of low temperature sintering were studied with the initial heat treatment of powder.$(Ni_{0.4-x}Cu_xZn_{0.60})_{1+w}(Fe_2O_4)_{1-w}$ (x=0.2, w=0.03) were calcined at $300^{circ}C~750^{circ}C.$ The sintered NiCuZn-ferrites at $900^{\circ}C$ showed good apparent density $4.90g/cm^3,$ and magnetic properties of initial permeability 164 and quality factor 72. As the calcination temperature increase, the grain size of NiCuZn-ferrite increased with irregular grain distribution and its magnetic properties were deteriorated.

Ag and Cu Precipitation in Multi-Layer Chip Inductors Prepared with V2O5 Doped NiCuZn Ferrites (V2O5 도핑된 NiCuZn 페라이트로 제조된 칩인덕터에서의 Ag/cu 석출)

  • Je, Hae-June;Kim, Byung-Kook
    • Korean Journal of Materials Research
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    • v.13 no.8
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    • pp.503-508
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    • 2003
  • The purpose of this study is to investigate the effect of $V_2$$O_{5}$ addition on the Ag and Cu precipitation in the NiCuZn ferrite layers of 7.7${\times}$4.5${\times}$1.0 mm sized multi-layer chip inductors prepared by the screen printing method using 0∼0.5 wt% $V_2$$O_{5}$ -doped ferrite pastes. With increasing the $V_2$$O_{5}$ content and sintering temperature, Ag and Cu oxide coprecipitated more and more at the polished surface of ferrite layers during re-annealing at $840^{\circ}C$. It was thought that during the sintering process, V dissolved in the NiCuZn ferrite lattice and the Ag-Cu liquid phase of low melting point was formed in the ferrite layers due to the Cu segregation from the ferrite lattice and Ag diffusion from the internal electrode. During re-annealing at $840^{\circ}C$, the Ag-Cu liquid phase came out the polished surface of ferrite layers, and was decomposed into the isolated Ag particles and the Cu oxide phase during the cooling process.

Magnetic Properties of NiZnCu Ferrite for Multilayer Chip Inductors (칩인덕터용 NiZnCu Ferrite의 자기적 특성 연구)

  • An, Sung-Yong;Moon, Byeong-Chol;Jung, Hyun-Chul;Jung, Hyun-Jin;Kim, Ic-Seob;Hahn, Jin-Woo;Wi, Sung-Kwon
    • Journal of the Korean Magnetics Society
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    • v.18 no.2
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    • pp.58-62
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    • 2008
  • $Ni_{0.4}Zn_{0.4}Cu_{0.2}Fe_2O_4$ ferrite was fabricated by solid stat reaction method and sol-gel method. Because of the drawbacks of each method, we combined these two methods together. We proposed and experimentally verified that nanocrystalline ferrite additive was effective on improving the densification behavior and magnetic properties of NiZnCu ferrites for multilayer chip inductors. The initial permeability of the toroidal core Sample with 20 wt% nanocrystalline ferrite increased from 78.1 to 178.2 as annealing temperature is increased from $880^{\circ}C$ to $920^{\circ}C$. The density, shrinkage and saturation magnetization were increased with increasing annealing temperature, which was attributed to the decrease of additive grain size and increase of sintering density.

Enhancement of Electromagnetic Properties of (NiCuZn)-Ferrites by Using Ultra-fine Powders Synthesis (나노분말합성에 의한 (NiCuZn)-Ferrites의 전자기적 특성 향상)

  • 허은광;강영조;김정식
    • Proceedings of the International Microelectronics And Packaging Society Conference
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    • pp.109-113
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    • 2002
  • 본 연구에서는 공침법에 의한 초미세분말을 이용하여 제조된 (NiCuZn)-ferrite와 건식법을 이용하여 제조된 (NiCuZn)-ferrite의 저온소결 특성 및 전자기적 특성을 상호 비교 분석하였다. 조성은 (N $i_{0.4-x}$C $u_{x}$Z $n_{0.6}$)$_{1+w}$(F $e_2$ $O_4$/)$_{1-w}$에서 x의 값을 0.2, w의 값은 0.03으로 고정하였고, 소결은 공침법으로 합성된 분말의 경우 초기열처리과정을 거쳐 최종적으로 90$0^{\circ}C$에서, 건식법의 경우 11$50^{\circ}C$의 온도에서 진행하였다. 그 결과, 공침법으로 제조된 (NiCuZn)-ferrite는 건식법으로 제조된 (NiCuZn)-ferrite보다 20$0^{\circ}C$이상 낮은 소결온도에서 높은 소결밀도 값을 가졌으며, 품질계수 등 칩 인덕터에서 중요한 요소인 전자기적 특성이 우수하게 나타났다. 또한, 공침법으로 합성된 페라이트는 분말의 초기열처리온도에 따라 최종소결 특성이 크게 변하였다. 그밖에 공침법과 건식법으로 합성한 (NiCuZn)-ferrite의 결정성, 미세구조들을 XRD, SEM, TEM을 이용하여 비교 고찰하였다.하였다.다.

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Electro-Magnetic Properties & Manufacturing Process of (NiCuZn)-Ferrites for Multilayer chip inductor by Wet Process (습식합성법을 이용한 칩인덕터용 (NiCuZn)-Ferrites의 제조공정과 전자기적 특성)

  • 허은광;김정식
    • Proceedings of the International Microelectronics And Packaging Society Conference
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    • pp.165-168
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    • 2002
  • 본 연구에서는 칩인덕터 코어 소재로 사용되는 (NiCuZn)-ferrite를 습식합성법을 이용하여 나노크기의 초미세 분말을 합성하였으며, 합성된 (ZiCuZn)-ferrite 의 제조공정 및 전파기적 특성에 관하여 고찰하였다. 조성은 (N $i_{0.4-x}$C $u_{x}$Z $n_{0.6}$)$_{1+w}$ (F $e_2$ $O_4$)$_{1-w}$에서 x의 값을 0.05~0.25 범위로 변화시켰으며, w 값은 0.03으로 고정하였다. 소결은 8$50^{\circ}C$에서 9$50^{\circ}C$의 범위에서 진행하였다. 나노크기의(NiCuZn)-ferrite를 사용함으로서 시약급 원료로 제조된 것보다 소결온도를 낮출 수 있었고, 밀도가 높은 페라이트 소결체를 얻을 수 있었다. 또한 초투자율, 품질계수 등 전자기적 특성이 우수하게 나타났다. 그 밖에 습식합성법으로 합성한 (NiCuZn)-ferrite 의 결정성, 미세구조 등을 XRD, SEM 을 이용하여 고찰하였다.하였다.다.

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Impurity Pick-Up for the Preparation of NiCuZn Ferrite Powder Using Ball Milling Process (NiCuZn Ferrite 분말제조에 있어서 Ball Mill 분쇄 공정 중에 혼입되는 불순물의 함량)

  • 고재천;류병환
    • Journal of the Korean Magnetics Society
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    • v.9 no.4
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    • pp.217-222
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    • 1999
  • The pick up impurity was studied for preparing the NiCuZn ferrite powder by a ball milling method that usually uses in the industrial ceramic process. The raw materials of NiO, CuO, ZnO, and $Fe_2O_3$ powder were weighted according to various spinel composition and mixed for 18 hrs by a wet ball milling method after that the slurry was followed by spray dried and calcined at $700^{\circ}C$ 3 hrs. The calcined NCZF powder was finally ball milled during 65 hrs as same method. The stainless steel ball and jar are used as mixing and milling equipment and the solid concentration of the slurry was 25 vol%. The impurities, stainless steel pickup, were effected by the composition of raw materials especially iron oxide, nickel oxide in the mixing process and by the rate of calcine of NiCuZn ferrite in final milling process. The empirical equation of stainless steel pickup was driven in the wet ball milling system. Finally, the composition of NiCuZn ferrite could be controlled by the empirical equation.

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