• Title, Summary, Keyword: Ferrite

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A Study on Electromagnetic Wave Absorbing Properties of $Ni_{0.5}$-$A_{0.1}-$Zn_{0.4}.${Fe_2}{O_4}$Ferrite-Rubber Composite by the variation of using amount of Ferrite ($Ni_{0.5}$-$A_{0.1}-$Zn_{0.4}.${Fe_2}{O_4}$ ferrite-Rubber Composite의 Ferrite 함량에 따른 전파흡수특성에 관한 연구)

  • 박연준;김동일
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.160-164
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    • 2000
  • In this paper, we studied the relation between using amount of ferrite and electromagnetic wave absorbing properties of ferrite-rubber composite. The variation of using amount of ferrite have been 52 wt.% ∼ 62 wt.% As s result, it has been shown that the electromagnetic wave absorbing properties of ferrite-rubber composite are related to the using amount of Ferrite in composite. And, we can control electromagnetic wave absorbing properties of ferrite-rubber composite by the control of using amount of ferrite.

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A Study on Electromagnetic Wave Absorbing Properties of $Ni_{0.6}-A_{0.1}-Zn_{0.3}{\cdot}Fe_2O_4$ Ferrite-Rubber Composite by the variation of using amount of Ferrite ($Ni_{0.6}-A_{0.1}-Zn_{0.3}{\cdot}Fe_2O_4$ Ferrite-Rubber Composite의 Ferrite 함량에 따른 전파흡수특성)

  • Park, Youn-Joon;SaGong, Geon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.162-166
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    • 2000
  • In this paper, we studied the relation between using amount of Ferrite and electromagnetic wave absorbing properties of ferrite-rubber composite. The variation of using amount of Ferrite have been 52 wt.% ~ 62 wt.%. As s result, it has been shown that the electromagnetic wave absorbing properties of ferrite-rubber composite are related to the using amount of Ferrite in composite. And, we can control electromagnetic wave absorbing properties of ferrite-rubber composite by the control of using amount of Ferrite.

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Electromagnetic Wave Absorbing Properties of $Ni_{0.5}-A_{0.1}-Zn_{0.4}{\cdot}Fe_2O_4$ Ferrite-Rubber Composite with amounts of a Ferrite (Ferrite 함량변화에 대한 $Ni_{0.5}-A_{0.1}-Zn_{0.4}{\cdot}Fe_2O_4$ Ferrite-Rubber Composite의 전파흡수특성)

  • Park, Y.J.;Shin, K.H.;Heo, J.;SaGong, G.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.45-49
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    • 2002
  • In this paper, we have studied about electromagnetic wave absorbing properties of ferrite-rubber composite with a variation of ferrite. Amounts of ferrite in a composite absorber were changed from 52 wt.% to 62 wt.%. As a result, it has been shown that the electromagnetic wave absorbing properties of ferrite-rubber composite are related to the amount of ferrite in composite absorber. As a summary, it could be controled the electromagnetic wave absorbing property of ferrite-rubber composite by changing some kinds of annex A and amount of ferrite.

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A Study on Electromagnetic Wave Absorbing Properties of $Ni_{0.5}$$-A_{0.1}$-$Zn_{0.4}$.${Fe_2}{O_4}$Ferrite-Rubber Composite by Heat-Treatment Temperature of ferrite (전파흡수체용 $Ni_{0.5}$$-A_{0.1}$-$Zn_{0.4}$.${Fe_2}{O_4}$의 열처리 온도에 따른 Ferrite-Rubber Composite의 전파흡수특성에 관한 연구)

  • 박연준;김동일;이창우
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.109-114
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    • 2000
  • In this paper, we studied the relation between heat-treatment temperature of ferrite and electromagnetic wave absorbing properties of ferrite-rubber composite. The heat-treatment temperatures of ferrite are 1200 and 1300 $^{\circ}C$, 2 hr. As s result, it has been shown that the optimum heat-treatment temperature of ferrite for electromagnetic wave absorber are related to the chemical composition. And, we can control electromagnetic wave absorbing properties of ferrite-rubber composite by the control of heat-treatment temperature of ferrite.

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NiZn Ferrite Coating for Electrical Insulation of MnZn Ferrite Cores

  • Kitamoto, Y.;Yajima, H.;Nakayama, Y.;Abe, M.
    • Journal of the Korean Ceramic Society
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    • v.38 no.6
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    • pp.506-508
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    • 2001
  • The ferrite plating with applying power ultrasound waves of 19.5 kHz and 600W enabled us to encapsulate entirely MnZn ferrite cores for transformers with Ni$\sub$x/Zn$\sub$y/Fe$\sub$3-x-y/O$_4$coating. Supplying a NH$_4$OH solution during the plating broke the limit of the solubility of Ni ions to ferrite-plated films. The electrical resistivity of the NiZn ferrite coating increased with increasing the Ni and Zn content, reaching 2.3${\times}$10$\^$5/Ωcm at the composition of Ni$\sub$0.24/Zn$\sub$0.30/Fe$\sub$2.46/O$_4$. The saturation magnetization was 540 emu/㎤. As a result, the MnZn ferrite cores were successfully encapsulated with the NiZn ferrite coatings for an insulation layer.

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A Study on Electromagnetic Wave Absorbing Properties of $Ni_{0.6}-A_{0.1}-Zn_{0.3}{\cdot}Fe_2O_4$ Ferrite-Rubber Composite by Heat-Treatment Temperature of Ferrite (전파흡수체용 $Ni_{0.6}-A_{0.1}-Zn_{0.3}{\cdot}Fe_2O_4$의 열처리 온도에 따른 Ferrite-Rubber Composite의 전파흡수특성)

  • Park, Youn-Joon;SaGong, Geon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.155-161
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    • 2000
  • In this paper, we studied the relation between heat-treatment temperature of ferrite and electromagnetic wave absorbing properties of ferrite-rubber composite. The heat-treatment temperatures of ferrite are 1200 and $1300^{\circ}C$, 2 hr. As s result. it has been shown that the optimum heat-treatment temperature of ferrite for electromagnetic wave absorber are related to the chemical composition. And, we can control electromagnetic wave absorbing properties of ferrite-rubber composite by the control of heat-treatment temperature of ferrite.

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Magnetic Properties of Hard/Soft Nanocomposite Ferrite Synthesized by Self-Combustion Precursors (자전 연소 전구체로 합성한 나노 크기 경/연 복합페라이트의 자기 특성)

  • Oh, Young Woo;Ahn, Jong Gyeon
    • Journal of the Microelectronics and Packaging Society
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    • v.22 no.3
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    • pp.45-50
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    • 2015
  • The goal of this research is the create novel magnets with no rare-earth contents, with larger energy product by comparison with currently used ferrites. For this purpose we developed nano-sized hard-type/soft-type composite ferrite in which high remanent magnetization (Mr) and high coercivity (Hc). Nano-sized Ba-ferrite, Ni-Zn ferrite and $BaFe_{12}O_{19}/Ni_{0.5}Zn_{0.5}Fe_2O_4$ composite ferrites were prepared by sol-gel combustion method by use of glicine-nitrate and citric acid. Nanocomposite ferrites were calcined at temperature range $700-900^{\circ}C$ for 1h. According to the X-ray diffraction patterns and FT-IR spectra, single phase of NiZn-ferrite and Ba-ferrite were detected and hard/soft nanocomposite ferrite was indicated to the coexistence of the magnetoplumbite-structural $BaFe_{12}O_{19}$ and spinel-structural $Ni_{0.5}Zn_{0.5}Fe_2O_4$ that agreed with the standard JCPDS 10-0325 data. The particle size of nanocomposite turn out to be less than 120 nm. The nanocomposite ferrite shows a single-phase magnetization behavior, implying that the hard magnetic phase and soft magnetic phase were well exchange-coupled. The specific saturation magnetization ($M_s$) of the nanocomposite ferrite is located between hard ($BaFe_{12}O_{19}$) and soft ferrite($Ni_{0.5}Zn_{0.5}Fe_2O_4$). The remanence (Mr) of nanocomposite ferrite is much higher than that of the individual $BaFe_{12}O_{19}$ and $Ni_{0.5}Zn_{0.5}Fe_2O_4$ ferrite, and $(BH)_{max}$ is increased slightly.

The Effect of Ferrite Ratio on the Properties of PWHT Overlaid Welds (Duplex SS 육성 용접부의 물성에 미치는 열처리전 페라이트 함량의 영향)

  • Seong, Hui-Jun;Kim, Yeong-Il;Seo, Chang-Gyo
    • Proceedings of the KWS Conference
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    • pp.294-296
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    • 2005
  • Several duplex overlaied-weldments which have different ferrite ratio were prepared by changing welding heat input ant post weld heat treatment were carried out to understand the effect of the ferrite ratio on the precipitation during post weld heat treatment. High heat input weldment indicated low ferrite ratio, while low heat input weldment has high ferrite ratio. Low ferrite ratio weldment showed much and faster precipitation. But high ferrite ratio weldment showed less and slower precipitation.

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A Study on the Low Temperature Preparation and the Practical Application of Ferrite Films by New Techniques. (신 기술에 의한 페라이트 막의 저온 제작과 그 응용에 관한 연구)

  • 최동진
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.11 no.8
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    • pp.658-663
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    • 1998
  • Ferrite plating enables were grown by ferrite by plating method in solution at low temperature(<10$0^{\circ}C$). This faciltates the fabrication of new ferrite thin film devices using non- heat-resistant materials(plastic, GaAs ect) as substrates. Combining the ferrite plating with sonochemistry, application of power ultrasonic waves to stimulate chemical reactions, the crystallinity and qualities of films were improved. Modifying the reactions cell and plating conditions further improved the film quality.

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Mechanism of intragranular ferrite formation in heat-affected zone of titanium killed steel

  • Terasaki, Hidenori;Komizo, Yu-Ichi
    • Proceedings of the KWS Conference
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    • pp.197-201
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    • 2009
  • A lot of work is carried out concerning to acicular ferrite formation in the weld metal of high strength and low-alloy steel. Those results are suggesting that oxides that contain titanium elements provides nucleation site of intragranular ferrite, referred as acicular ferrite. Thus, when intragranular ferrite is expected to form in heat-affected zone, oxide containing titanium element should be formed in the steel. However, normal steel is deoxidized by using aluminum element (Al-killed steel) with little oxygen content. It means almost oxygen is deoxidized with aluminum elements. In the present work, in order to form the acicular ferrite in the heat affected zone, with the same concept in the case of weld metal, the steel deoxidized with titanium element (titanium killed-steel) is prepared and the acicular ferrite formation is observed in detail by using laser-conforcal microscopy technique. The confocal technique makes it possible that the morphological change along the phase transformation from austenite to ferrite is in-situ tracked. Thus, the inclusion that stimulated the ferrite nucleation could be directly selected from the observed images, in the HAZ of the Ti-killed steel. The chemical composition of the selected inclusion is analyzed and the nucleation potential is discussed by changing the nucleation site with boron element. The potency for the ferrite nucleation is summarized and the existence of effective and ineffective manganese sulfide for nucleation is made clear.

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