• Title/Summary/Keyword: Mn-Zn Ferrites

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Studies on Spinel Ferrites (I) Effects of Addition of Rare-Earth Oxides on the Magnetic Properties of Mn-Zn Ferrites (Spinel Ferrite에 관한 연구 (I) Mn-Zn계 Ferrite의 자기특성에 대한 희토류산화물의 첨가효과)

  • 김태옥
    • Journal of the Korean Ceramic Society
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    • v.14 no.2
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    • pp.78-81
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    • 1977
  • The effects of variation in composition and the addition of small amount of the rare-earth oxides La2O3, CeO2 and Sm2O3 on the magnetic properties of Mn-Zn system ferrites, 0.5MnO.0.5ZnO.(1+0.1X) Fe2O3(X=-1, 0, 1, 2), were investigated in the range of frequencies of 0.1~100 kHz. It was shown that the magnetic permeability of the specimens with the composition Mn 0.5 Zn 0.5 Fe2O4 was maximum in the Mn-Zn system ferrites, and that the addition of a small amount of the rare-earth oxides to the composition 0.5 MnO.0.5ZnO.0.9 Fe2O3 caused the sharp increase of magnetic permeability and the decrease of the loss factors.

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CO2 Decomposition with Waste Ferrite (폐기물 페라이트를 이용한 CO2분해)

  • 신현창;김진웅;최정철;정광덕;최승철
    • Journal of the Korean Ceramic Society
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    • v.40 no.2
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    • pp.146-152
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    • 2003
  • The waste ferrites from magnetic core manufacturing process were used to $CO_2$gas decomposition to avoid the greenhouse effects. The waste ferrites are the mixed powder of Ni-Zn and Mn-Zn ferrites core. In the reduction of ferrites by 5% $H_2/Ar$ mixed gas, the weight loss of ferrites was about 14~16wt%. After the$CO_2$gas decomposition reaction, the weight of the reduced ferrites was increased up to 11wt%.$CO_2$gas was decomposed by oxidation of Fe and FeO in reduced compound and the phase of the waste ferrite was changed to spinel structure. A new technique capable of$CO_2$decomposition as low cost process through utilizing waste ferrite was development.

Study on the Power Loss of High Frequency Mn-Zn ferrites (고주파 Mn-Zn ferrites 전력손실에 대한 고찰)

  • 서정주
    • Resources Recycling
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    • v.11 no.5
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    • pp.34-38
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    • 2002
  • To minimize the size of transformer volume, the operating frequency of ferrites cores increasing. The power loss of Mn-Zn ferrites comprises hysteresis loss, eddy current loss and residual loss. In the range more then 500 KHz, the total power loss is mainly due to the residual loss. The power loss increase with the frequency 3rd power. To minimize residual loss as well as eddy current loss, the microstructure should have small grain and high density, It should be noted that as the product of resonance frequency and static permeability increase, the power loss decrease at high frequency region.

The Study on the Effect of Processing Parameters on the Electromagnetic Properties of Mn-Zn Ferrites (Mn - Zn 페라이트의 전.자기적 물성에 미치는 공정변수의 영향 고찰)

  • 황진현;신명승;한영호
    • Journal of the Korean Magnetics Society
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    • v.7 no.2
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    • pp.69-75
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    • 1997
  • The effect of oxide additive system and $Po_2$ condition on the power loss, microstructure, initial permeability, ${\mu}_i$ vs. temperature curve of Mn-Zn ferrites has been investigated. The density and permeability increased with various additive systems while the power loss decreased. It was confirmed that the oxide additives are grain boundary materials and do not change the magnetic properties of Mn-Zn ferrites such as $T_{spm}$ and $T_c$. The ${\mu}_i$ vs. T curve indicated that $T_{spm}$ moved to the higher temperature as $Po_2$ increased. It was also confirmed that the microstructure of Mn-Zn ferrites was independent of the $Po_2$ control during cooling.

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Effects of $v_2O_5$ Addition on the Magnetic Properties of Mn-Zn Ferrites (Mn-Zn Ferrites 의 자기적 성질에 미치는 $V_2O_5$의 첨가효과)

  • Jo, Deok-Ho
    • Journal of the Korean Magnetics Society
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    • v.2 no.3
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    • pp.222-227
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    • 1992
  • The effects of $V_2O_5$ addition as an additive on the densification, the microstructure and the magnetic properties of Mn-Zn ferrites were studied. The maximum density was observed at 0.1 wt% $V_2O_5$ content and it was recognized that a small content of $V_2O_5$ prohibited the discontinuous grain growth. The initial permeability showed maximum at 0.1 wt% $V_2O_5$ content and the power loss minimum at 0.03 wt% $V_2O_5$ content. It was found that a small content of $V_2O_5$ went into solid solution in the Mn-Zn ferrites, but above that extent $V_2O_5$ formed a second phase to be segregated at the grain boundaries.

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Effect of Sintering Conditions on the Electromagnetic Properties of Mn-Zn Ferrites (소결조건이 Mn-Zn Ferrites의 전자기적 물성에 미치는 효과)

  • 최윤호;신명승;한승기;한영호
    • Journal of the Korean Ceramic Society
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    • v.34 no.6
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    • pp.561-568
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    • 1997
  • The effects of sintering temperature and oxygen partial pressure on the electromagnetic properties of Mn-Zn ferrites were investigated. The grain increased with increasing temperature. The power loss at 100 kHz was decreased, while the power loss at 500 kHz was increased as the grain size increased with sintering temperature. Sintering with low oxygen partial pressure at 115$0^{\circ}C$ resulted in high density and initial permeability, and decreased the power loss at 100 kHz and 500 kHz. The oxygen partial pressure lower than 10-2 atm. during heating, significantly suppressed the hysteresis loss. However, the oxygen activity did not affect the grain size of sintered cores.

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