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The permanent magnetic nanocomposite PrNdFeB/Fe_7Co_3 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 Fe_7Co_3 phase and 510.2 kJ/mol of 2:14:1 phase, respectively.
The permanent magnetic nanocomposite PrNdFeB / Fe_7Co_3 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 the 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 344.4 kA / m, the maximum magnetic energy product (BH) max of 32.6 kJ / m~3. In addition, the activation energy of each phase was calculated by Kissinger equation, which was 310.4 kJ / mol of Fe_7Co_3 phase and 510.2 kJ / mol of 2: 14: 1 phase, respectively.