• Title/Summary/Keyword: Mn-Zn ferrite

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Slip Casting of Mn-Zn Ferrite Powders Prepared by Alcoholic Dehydration Method (알콜탈수법에 의해 제조된 Mn-Zn Ferrite 분체의 주입성형)

  • 이경직;이대희;신효순;이석기;김창현;이병교
    • Journal of the Korean Ceramic Society
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    • v.34 no.4
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    • pp.394-398
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    • 1997

  • Mn-Zn ferrite powders were prepared by alcoholic dehydration, using coprecipitation method. Then the effects of organic dispersant and polymeric binder concentration on stability and casting of slurry were discussed. Citric acid, the organic dispersant and polyvinylacohol(PVA), the non-ionic binder, were selected as additives of slurry. With variation of concentration of water, citric acid and polyvinylalcohol(PVA), optimum forming conditions were determined from viscosity and density. To compare with dry process, density and microstructure of sintered body formed by uniaxial die pressing were observed.

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Development of Paint-type EM Wave Absorbers for Radar Used in Ships (선박용 레이다의 허상 방지용 PAINT형 전파흡수체의 개발)

  • Jung, Jae-Hyun;Kim, Dong-Il;Song, Jae-Man;Choi, Jung-Hyun
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2005.06a
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    • pp.423-428
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    • 2005

  • We prepared paint-type and sheet-type EM wave absorbers with Mn-Zn Ferrite, Ni-Zn Ferrite, Ba Ferrite, Sr Ferrite, and Sendust against ghosts of a mater in ships. To prepare the absorbers, enamel paint and epoxy paint were used as binders. The prepared EM wave absorber's absorption properties were investigated. The prepared EM wave absorbers have 6 dB over in 2 GHz ${\sim}$ 4 GHz. We compared properties of wave absorption between paint-type and spray-type

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