Effects of cobalt addition on microstructure and magnetic properties of PrNdFeB/Fe7Co3 nanocomposite
来源期刊：Journal of Rare Earths2017年第5期
论文作者：丁贺伟 崔春翔 杨薇 孙继兵
文章页码：468 - 473
摘 要：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/m3. 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.
丁贺伟，崔春翔，杨薇，孙继兵
Key Lab. for New Type of Functional Materials in Hebei Province, School of Materials Science and Engineering, Hebei University of Technology
摘 要：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/m3. 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.
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