摘要
采用Fe_(3)O_(4)磁性纳米颗粒掺杂法制备Fe-6.5wt%Si/Fe_(3)O_(4)微纳复合磁粉芯,研究了纳米Fe_(3)O_(4)添加量对Fe-6.5wt%Si/Fe_(3)O_(4)复合磁粉芯的相结构、微观形貌等组织结构特征,以及致密度、电阻率、有效磁导率、功率损耗等物理特性的影响规律。研究结果表明:添加适量磁性纳米Fe_(3)O_(4)填充Fe-6.5wt%Si微米颗粒间的孔隙,增加单位体积内磁性物质的量,能够明显削弱由非磁性树脂绝缘包覆所造成的磁稀释效应,且磁性纳米Fe_(3)O_(4)与Fe-6.5wt%Si颗粒相互作用实现相邻磁性颗粒间磁通的连续性,大幅度提高磁导率。特别是,当纳米Fe_(3)O_(4)添加量达3wt%时,复合磁粉芯的综合性能最优,其中密度从6.48 g/cm^(3)提高至6.66 g/cm^(3),有效磁导率从72.8提升至81.7,且具有良好的频率稳定性。
The Fe-6.5wt%Si/nano-Fe_(3)O_(4) soft magnetic composites(SMCs)are prepared by doping magnetic Fe_(3)O_(4) nanoparticles.The influence of nano-Fe_(3)O_(4) addition on microstructure,density,resistivity,permeability,and core loss of the SMCs are studied.The results show that the addition of appropriate amount of nano-Fe_(3)O_(4) can fill the pores between Fe-6.5wt%Si powders to increase the content of magnetic materials in unit volume and weaken the magnetic dilution effect caused by non-magnetic resin.The interaction of nano-Fe_(3)O_(4) and Fe-6.5wt%Si particles maintains the magnetic flux continuity of SMCs and greatly improves the permeability.Particularly when the addition of nano-Fe_(3)O_(4) is 3wt%,the overall performance of SMCs is optimal,in which the density is increased from 6.48 g/cm^(3) to 6.66 g/cm^(3),the effective permeability is increased from 72.8 to 81.7,and it has a good frequency stability.
作者
杨天生
卢克超
王健
郑志刚
刘辛
YANG Tiansheng;LU Kechao;WANG Jian;ZHENG Zhigang;LIU Xin(School of Materials Science and Engineering,South China University of Technology,Guangzhou 510650,China;Institute of New Materials,Guangdong Academy of Sciences,Guangdong Provincial Key Laboratory ofMetal Toughening Technology and Application,Guangzhou 510650,China;National Engineering Research Center of Powder Metallurgy of Titanium&Rare Metals,Guangzhou 510650,China)
出处
《功能材料》
CAS
CSCD
北大核心
2021年第10期10023-10028,共6页
Journal of Functional Materials
基金
广东省科学院建设国内一流研究机构专项资金项目——“千名博士后计划”专项、国家级科技创新平台创新能力提升专项(2021GDASYL-20210103098,2020GDSYL-20200402008)
佛山市核心技术攻关项目(1920001001392)。
