Low temperature firing of Cob>2b>Y-NiCuZn ferrite composites

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• 作者：Hsing-I. Hsiang ; ^{hsingi@mail.ncku.edu.tw} ; Po-Wen Cheng ; Fu-Su Yen
• 关键词：B. Composites ; Hexagonal ferrites ; NiCuZn ferrites ; Low temperature firing
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：August, 2012
• 卷：38
• 期：6
• 页码：4915-4921
• 文件大小：1543 K

摘要

Hexagonal structure magnetoplumbite ferrites have revealed a higher dispersion frequency than that of nickel ferrites because of the magnetoplumbite's magnetic anisotropy. The magnetoplumbite ferrite densification temperature always exceeds 1000 掳C and the initial low temperature firing permeability of magnetoplumbite ferrites with added glass is too low (渭b>ib> = 2-4). Therefore, it is desirable to develop a material that has a higher permeability at above 300 MHz and can be densified at temperatures below 900 掳C. The Bib>2b>Ob>3b>-Bb>2b>Ob>3b>-ZnO-SiOb>2b> (BBSZ) glass addition effects on the densification and magnetic properties of Cob>2b>Y-NiCuZn ferrite composites with various Cob>2b>Y/NiCuZn ferrite ratios were investigated. The densification of Cob>2b>Y-NiCuZn ferrite composites was enhanced by the addition of glass at low sintering temperatures (<900 掳C) due to the liquid phase sintering. Cob>2b>Y-NiCuZn ferrite composites with 4 wt%BBSZ glass sintered at 900 掳C show a relative density above 90%, a high-initial-permeability of 5-6, a quality factor of above 30 in the 200-300 MHz frequency and a resonance frequency above 1 GHz, which can be used in high frequency multilayer chip inductors.