Enhanced soft magnetic properties of SiO_(2)-coated FeSiCr magnetic powder cores by particle size effect  

作　　者：Mingyue Ge Likang Xiao Xiaoru Liu Lin Pan Zhangyang Zhou Jianghe Lan Zhengwei Xiong Jichuan Wu Zhipeng Gao 葛铭悦;肖礼康;刘潇如;潘嶙;周章洋;蓝江河;熊政伟;吴冀川;高志鹏(Joint Laboratory for Extreme Conditions Matter Properties,School of Mathematics and Physics,Southwest University of Science and Technology,Mianyang 621010,China;Southwest Institute of Applied Magnetism,Mianyang 621010,China;Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621900,China;Sichuan Civil-military Integration Institute,Mianyang 621010,China)

机构地区：[1]Joint Laboratory for Extreme Conditions Matter Properties,School of Mathematics and Physics,Southwest University of Science and Technology,Mianyang 621010,China [2]Southwest Institute of Applied Magnetism,Mianyang 621010,China [3]Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621900,China [4]Sichuan Civil-military Integration Institute,Mianyang 621010,China

出　　处：《Chinese Physics B》2024年第10期405-412,共8页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.U2230119 and U23A20567);2022 Central Guidance on Local Science and Technology Development Projects(Grant No.2022ZYDF073);Outstanding Youth Fund of Sichuan Province(Grant No.22JCQN0005).

摘　　要：It has been known that metal FeSiCr powders with large average particle sizes have been typically employed to prepare magnetic powder cores(SMCs),with few studies reported on the influence of magnetic properties for original powders with various average particle sizes less than 10m.In this work,SiO_(2)-coated FeSiCr SMCs with different small particle sizes were synthesized using the sol-gel process.The contribution of SiO_(2)coating amount and voids to the soft magnetic properties was elaborated.The mechanism was revealed such that smaller particle sizes with less voids could be beneficial for reducing core loss in the SMCs.By optimizing the core structure,permeability and magnetic loss of 26 and 262 kW/cm^(3)at 100 kHz and 50 mT were achieved at a particle size of 4.8m and ethyl orthosilicate addition of 0.1 mL/g.The best DC stacking performance,reaching 87%,was observed at an ethyl orthosilicate addition rate of 0.25 mL/g under 100 Oe.Compared to other soft magnetic composites(SMCs),the FeSiCr/SiO_(2)SMCs exhibit significantly reduced magnetic loss.It further reduces the magnetic loss of the powder core,providing a new strategy for applications of SMCs at high frequencies.

关 键 词：FeSiCr SiO_(2) size effect magnetic properties DC superposition 

分 类 号：O469[理学—凝聚态物理]