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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

添加Ta2O5对MnZn功率铁氧体性能的影响

李乐中， 兰中文， 余 忠， 孙 科， 罗 明， 姬海宁   

  1. 电子科技大学 电子薄膜与集成器件国家重点实验室， 成都 610054
  • 收稿日期:2008-07-08 修回日期:2008-08-25 出版日期:2009-03-20 网络出版日期:2009-03-20

Influence of Ta2O5 Addition on the Properties of MnZn Power Ferrites

LI Le-Zhong, LAN Zhong-Wen, YU Zhong, SUN Ke, LUO Ming, JI Hai-Ning   

  1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
  • Received:2008-07-08 Revised:2008-08-25 Published:2009-03-20 Online:2009-03-20

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摘要： 采用氧化物陶瓷工艺制备MnZn功率铁氧体，研究了不同Ta2O5含量对MnZn功率铁氧体微观结构和磁性能的影响. 结果表明：少量Ta2O5的加入可以使铁氧体烧结样品的晶粒尺寸增大，气孔率下降，起始磁导率、饱和磁感应强度和电阻率升高，损耗降低. 而加入过多的Ta2O5会导致异常晶粒长大，气孔率升高，起始磁导率、饱和磁感应强度和电阻率降低，损耗增大. 当Ta2O5含量为0.04wt%时，铁氧体烧结样品的晶粒尺寸大小均匀，气孔率最低，起始磁导率、饱和磁感应强度和电阻率达到最大值，损耗最低.

关键词: MnZn功率铁氧体, Ta2O5添加剂, 微观结构, 磁性能

Abstract: MnZn ferrites with the chemical formula Mn0.68Zn0.25Fe2.07O4 were prepared by conventional ceramic techniques. The influence of Ta2O5 addition on the microstructure and magnetic properties of MnZn ferrites was investigated. When the Ta2O5 addition is less than 0.04wt%, the grain size increases with the increase of Ta2O5 concentration, the initial permeability, saturation magnetic flux density and DC resistivity increase, the power losses and porosity decrease. However, excessive Ta2O5 addition (>0.04wt%) results in the exaggerated grain growth and porosity increase which make the initial permeability, saturation magnetic flux density and DC resistivity decrease, and the power losses increase. When the Ta2O5 addition is 0.04wt%, the initial permeability, saturation magnetic flux density and DC resistivity reach the maximum, the power losses and porosity reach the minimum.

Key words: MnZn power ferrites, Ta2O5 addition, microstructure, magnetic properties

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