添加Ta_2O_5对MnZn功率铁氧体性能的影响  

Influence of Ta_2O_5 Addition on the Properties of MnZn Power Ferrites

作　　者：李乐中[1] 兰中文[1] 余忠[1] 孙科[1] 罗明[1] 姬海宁[1] 

机构地区：[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

出　　处：《无机材料学报》2009年第2期379-382,共4页Journal of Inorganic Materials

基　　金：四川省科技攻关项目(2006Z02-032)

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.MnZn ferrites with the chemical formula Mn0.68 Zn0.25 Fe2.07 O4 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.

关 键 词：MNZN功率铁氧体 Ta2O5添加剂 微观结构 磁性能 

分 类 号：TM277[一般工业技术—材料科学与工程]