变形和能量注入协同作用制备可控非晶纳米晶结构超高饱和磁化强度FeCoB粉末  

Ultrahigh saturation magnetization in FeCoB powders with controllable amorphous-nanocrystalline structure via the synergism of deformation and energy injection

作　　者：李枧 邵里良 白荣晟 周靖 童星 林怀俊 张猛 柯海波 汪卫华 Jian Li;Liliang Shao;Rongsheng Bai;Jing Zhou;Xing Tong;Huai-Jun Lin;Meng Zhang;Hai-Bo Ke;Wei-Hua Wang(Institute of Advanced Wear&Corrosion Resistance and Functional Materials,Jinan University,Guangzhou 510632,China;Songshan Lake Materials Laboratory,Dongguan 523808,China;Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]Institute of Advanced Wear&Corrosion Resistance and Functional Materials,Jinan University,Guangzhou 510632,China [2]Songshan Lake Materials Laboratory,Dongguan 523808,China [3]Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Science China Materials》2024年第6期1985-1993,共9页中国科学（材料科学）（英文版）

基　　金：financially supported by Guangdong Major Project of Basic and Applied Basic Research,China (Grant No.2019B030302010);the National Natural Science Foundation of China (No.52301212,52071157,52071222);the National Key Research and Development Program of China (Grant No.2021YFA0716302);the open research fund of Songshan Lake Materials Laboratory (No.2022SLABFN11)。

摘　　要：非晶纳米晶磁粉芯(ANMPCs)是电子元器件在高频应用的关键软磁材料.但其相对较低的饱和磁化强度无法满足器件的小型化要求.强Fe-Co交换耦合非晶纳米晶粉是制备高磁化强度ANMPCs的潜在材料.本文采用机械球磨法制备了一系列(Fe_(0.8)Co_(0.2))_(87)B_(13)软磁粉末,这些粉末的非晶相、纳米晶相含量和粒径可调.在球磨过程中,出现了合金化、玻璃化和纳米化三个阶段以及粉末形貌和尺寸的非线性变化,进而导致ANMPCs软磁性能的非单调变化.磁粉具有超高饱和磁化强度达239 emu g^(-1),有效磁导率为33.球磨150 h后,FeCoB粉末非晶-纳米晶双相结构达到动态平衡,同时粒径达亚微米尺度,从而提高了粉末高频稳定性且降低了磁芯损耗.在变形和能量注入的协同作用下,机械球磨实现了含极高铁磁元素的非晶-纳米晶双相粉末可控制备、提高了高磁化强度ANMPCs综合软磁性能.Amorphous-nanocrystalline magnetic powder cores(ANMPCs)are highly potential soft magnetic materials in high-frequency applications of power electronic devices.However,their relatively low saturation magnetization cannot satisfy the miniaturization of devices.Strong FeCo exchange coupling amorphous-nanocrystalline powder is a promising candidate to prepare the required ANMPCs.In this work,a series of(Fe_(0.8)Co_(0.2))_(87)B_(13) soft magnetic powders with con-trollable content of amorphous and nanocrystalline phases and tunable particle size were fabricated by mechanical ball milling of pure Fe,Co and B powders.During the ball-milling procedure,the three-stage vitrification and nanocrystalliza-tion combined with morphology and size developments were revealed,leading to the nonmonotonic variation of soft magnetic properties.The combination of ultrahigh saturation magnetization of 239 emu g^(-1) and moderate effective perme-ability of 33 was achieved in the milled magnetic powders.After milling for 150 h,the FeCoB powder reaches a dynamic equilibrium manifesting as the nano-to-micro scale particle size and a stable amorphous-nanocrystalline dual-phase structure,which results in the improvement of high-frequency stability and core loss.With the synergism of deformation and energy injection,the mechanical ball milling is an effective way to realize the controllable nanocrystallization of amor-phous powders containing ultimate ferromagnetic elements and improve the comprehensive soft magnetic properties of ANMPCs.

关 键 词：amorphous-nanocrystalline magnetic powder core mechanical ball milling ultrahigh ferromagnetic element sa-turation magnetization high-frequency properties 

分 类 号：TB383.3[一般工业技术—材料科学与工程]