纳米晶复合Pr2Fe14B/α-Fe永磁材料磁性的研究

采用熔体快淬的方法制备Pr₂Fe₁₄B/α-Fe纳米晶复合永磁材料.使用振动样品磁强计(VSM)测量样品的室温磁性能.实验合金成分为(Pr_xFe_94.3-xB_5.7)_0.99Zr₁(其中x＝8.2，8.6，9.0，9.4，9.8，10.2，10.6，11.0，11.4(原子分数，%)).系统地研究了辊速及合金成分对快淬带磁性能的影响，当Pr原子分数由8. 关键词： 纳米复合永磁材料 熔体快淬 2Fe₁₄B/α-Fe')" href="#">Pr₂Fe₁₄B/α-Fe 磁性

Study of magnetic properties of Pr2Fe14B/α-Fe nanocomposite magnets

Pr₂Fe₁₄B/α-Fe nanocomposite magnets were prepared by the melt-spinning technique. The magnetic properties of the magnets were measured by means of a vibrating sample magnetometer(VSM). Alloy compositions were (Pr_xFe_94.3-xB_5.7)_0.99Zr₁ with x=8.2, 8.6, 9.0, 9.4, 9.8, 10.2, 10.6, 11.0 and 11.4(atomic fraction,%). The effects of the wheel speed and alloy composition on the magnetic properties of melt-spun ribbons were investigated systematically. A decrease of remanence J_r with the increase of atomic fraction of Pr is observed causing an increase in coercivity H_ci when changing Pr fraction from 8.2% to 11.4 % which is believed to be the cause of the decrease in maximum energy product (BH)_max. Despite the low value of H_ci obtained for the 8.2 % Pr alloy, (BH)_max is substantially raised by the high J_r which reflects the high volume fraction of α-Fe phase. The J_r, H_ci and (BH)_max of the best sample quenched at a wheel speed of 25 m/s are 1.37T, 501.19kA/m and 227.93kJ/m³, respectively. The magnetic properties in the direction perpendicular to the ribbon surface are much higher than that in the direction parallel with the ribbon surface.