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

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Journal of Materials Science & Technology 2023年第13期144卷 161-167页

作者： Longfei Ma Wei Quan Jinkui Fan Yanbai Chen Qiang Zheng Baoru Bian Jian Zhang Juan Du Institute of Materials School of Materials Science and EngineeringShanghai UniversityShanghai 200444China Ningbo Institute of Material Technology&Engineering Chinese Academy of SciencesNingbo 315201China

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

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magnetic Properties and Phase Components of Rapidly Quenched Fe-Nd-B Alloys

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Progress in Natural Science:Materials International 1993年第2期3卷 130-137页

作者：沈保根杨林原 Academia Sinica Beijing 100080 PRC State Key Laboratory of Magnetism Institute of Physics

The systematic investigations on the crystallization behavior and the formation of themetastab;e phases of rapidly quenched alloys of Fe-rich composition in the Fe-Nd-B system and the effects ofheat treatment on its phase structure and hard magnetic properties are carried out.A room-temperature maxi-mum magnetic energy product(BH)max=106 kJ/m~3 is obtained in the optimally annealed rapidly quenchedFe Nd-B alloys with lower Nd concentration of about 4.5%.The influences of element(Dy,Co)substitution on coercive field and energy product of Fe775Nd4B185alloys are also studied.

关键词： crystallization metastable phase coercive fields magnetic energy product

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