High magnetic energy product in isotropic nanocomposite powders with high percent of soft phase towards ultrastrong magnets  

作　　者：Longfei Ma Wei Quan Jinkui Fan Yanbai Chen Qiang Zheng Baoru Bian Jian Zhang Juan Du 

机构地区：[1]Institute of Materials,School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China [2]Ningbo Institute of Material Technology&Engineering,Chinese Academy of Sciences,Ningbo 315201,China

出　　处：《Journal of Materials Science & Technology》2023年第13期161-167,共7页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos.52171184,51771220,51771095);Zhejiang Provincial Natural Science Foundation of China (No.LD19E010001).

摘　　要：Nanostructure of magnetically hard and soft materials is fascinating for exploring next-generation ul-trastrong permanent magnets with less expensive rare-earth elements.However,the resulting hard/soft nanocomposites often exhibit a low remanence/energy product due to the challenge in obtaining ideal phase components and appropriate soft phase fraction.In this work,a novel microstructure of multiple phases consisting of 1:5 phase and 1:3 phase as main hard phase,and a high ratio of Fe(Co)(27 wt.%-48 wt.%)as soft phase was obtained in Sm-Co(Fe)/Fe nanocomposite magnet.The grain size of both hard and soft phases below 15 nm was observed.The optimal energy product for Sm-Co(Fe)/Fe(Co)nanocom-posite is 2.1 times(an increment of 107%)of the corresponding single-hard-phase powders without soft phase.It reports that the isotropic nanocomposite powders exhibit a record of magnetic energy product larger than 25 MGOe(the highest value is 28.6 MGOe).The high performance and the microstructure achieved in this work for the isotropic powders will shed light on and provide a good premise for syn-thesizing high performance anisotropic bulk nanocomposite magnets.

关 键 词：Nanocomposite Sm-Co(Fe)/Fe(Co) Microstructure Phase composition Phase fraction Magnetic energy product 

分 类 号：TM273[一般工业技术—材料科学与工程] TB383.1[电气工程—电工理论与新技术]