Effects of cobalt addition on microstructure and magnetic properties of PrNdFeB/Fe7Co3 nanocomposite

The permanent magnetic nanocomposite PrNdFeB/Fe7Co3 ribbons were prepared by directly quenching, and the microstructure and magnetic influence of composite materials with Co substitution were studied. The phase identification and the magnetic properties were measured by X-ray diffraction（XRD） and vi...

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Published inJournal of rare earths Vol. 35; no. 5; pp. 468 - 473
Main Author 丁贺伟 崔春翔 杨薇 孙继兵
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2017
Subjects
activation energy
magnetic properties
melt spinning
nanocomposite materials
rare earths
activation energy
nanocomposite materials
magnetic properties
melt spinning
rare earths
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Summary:The permanent magnetic nanocomposite PrNdFeB/Fe7Co3 ribbons were prepared by directly quenching, and the microstructure and magnetic influence of composite materials with Co substitution were studied. The phase identification and the magnetic properties were measured by X-ray diffraction（XRD） and vibrating sample magnetometry（VSM）. Microstructure observation was performed using scanning electron microscopy（SEM）. The crystallization temperatures of the hard magnetic phase and the soft magnetic phase were measured using differential scanning calorimetry（DSC）. The experimental results showed that Co addition improved the Curie temperature of magnets. When the ribbons were melt-spun at 35 m/s, the added content of Co was 4 at.%, and the magnetic properties were the best, which were remanence（Br） of 0.379 T, coercivity（Hci） of 344.4 kA/m, the maximum magnetic energy product（BH）max of 32.6 kJ/m~3. Besides, the activation energy of each phase was calculated by Kissinger equation, which was 310.4 kJ/mol of Fe7Co3 phase and 510.2 kJ/mol of 2：14：1 phase, respectively.
Bibliography:11-2788/TF
coercivity vibrating cobalt permanent calorimetry Curie substitution magnetization heating quenching
The permanent magnetic nanocomposite PrNdFeB/Fe7Co3 ribbons were prepared by directly quenching, and the microstructure and magnetic influence of composite materials with Co substitution were studied. The phase identification and the magnetic properties were measured by X-ray diffraction（XRD） and vibrating sample magnetometry（VSM）. Microstructure observation was performed using scanning electron microscopy（SEM）. The crystallization temperatures of the hard magnetic phase and the soft magnetic phase were measured using differential scanning calorimetry（DSC）. The experimental results showed that Co addition improved the Curie temperature of magnets. When the ribbons were melt-spun at 35 m/s, the added content of Co was 4 at.%, and the magnetic properties were the best, which were remanence（Br） of 0.379 T, coercivity（Hci） of 344.4 kA/m, the maximum magnetic energy product（BH）max of 32.6 kJ/m~3. Besides, the activation energy of each phase was calculated by Kissinger equation, which was 310.4 kJ/mol of Fe7Co3 phase and 510.2 kJ/mol of 2：14：1 phase, respectively.
DING Hewei , CUI Chunxiang , YANG Wei, SUN Jibing （Key Lab. for New Type of Functional Materials in Hebei Province, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China）
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(17)60935-9