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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/26508

Title: Si–Ca species modification and microwave sintering for NiZn ferrites
Authors: Yin-Ju Yang;Ching-Iuan Sheu;Syh-Yuh Cheng;Horng-Yi Chang
Contributors: 國立臺灣海洋大學:輪機工程學系
Keywords: NiZn ferrite;Microueave scintering;Grain size
Date: 2004-12
Issue Date: 2011-10-20T08:36:22Z
Publisher: Journal of Magnetism and Magnetic Materials
Abstract: abstract:NiZn ferrite particles were precoated with Si–Ca precursor by sol–gel method. Thus convention-sintered particles exhibited small grain size about 2 μm and lowered magnetic permeability as well as increased coercive magnetic field effectively. Microwave sintering could suppress grain growth as the same result of conventional sintering specimens with SiO2–CaO precoating. In microwave process, the grain growth inhibition expressed more obviously for the SiO2–CaO precoated specimens. The magnetic permeability (∼300) after SiO2–CaO precoating became lower than original ferrite (∼800) without SiO2–CaO precoating in conventional sintering. However, the magnetic permeability was lowered no matter whether SiO2–CaO precoating in microwave process. On the other hand, microwave sintering possessed short processing time, for example, 1250 °C/5 min, to prohibit ZnO volatilization in accompanied with grain size reduction. Therefore, such contribution increased resistivity to about 12×106 Ω cm compared to 3×106 Ω cm of original NiZn ferrite. The large coercive magnetic field (Hc) was ascribed to the superposition of small grain size and stress induced by microwave sintering.
Relation: 284, pp.220–226
URI: http://ntour.ntou.edu.tw/handle/987654321/26508
Appears in Collections:[輪機工程學系] 期刊論文

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