(Nd_(1-x)Pr_x)_(10.5)(FeCoZr)_(83.5)B_6合金显微结构和磁性能研究

Studies on microstructure and magnetic properties of (Nd_(1-x)Pr_x)_(10.5)(FeCoZr)_(83.5)B_6 alloy

采用部分过快淬加后续晶化退火工艺,制备出了最佳磁性能的(Nd1-xPrx)10.5(FeCoZr)83.5B6(x=0、0.2、0.4、0.6、0.8、1.0)系列粘结磁体,研究了稀土Pr元素对快淬合金DTA曲线转折温度点、合金显微组织结构和粘结磁体磁性能的影响。Pr元素使合金非晶态的晶化转变温度和转化能降低,合金的显微组织结构变得较粗大和较不均匀,从而使快淬粘结磁体剩磁降低。随Pr含量的增加,磁体的内禀矫顽力Hci单调上升,剩磁Br单调下降,在x=0.6～0.8处(BH)m达到最大值70.6kJ·m3。

By sub-overquenching to get an amorphous alloy with fine crystallites and annealing under the optimal conditions, the melt-spun (Nd1-xPrx)10.5 (FeCoZr)83.5B6 (x=0, 0.2, 0.4, 0.6, 0.8, 1.0) bonded magnets with the best magnetic properties were prepared. The effect of Pr on thermal stability, microstructure and magnetic properties of the alloy was investigated. The substitution of Nd by Pr leads the crystallization temperature and crystallization energy to decrease. The thermal stability difference results in a rougher and more inhomogeneous microstructure and a degraded Br. With the increase of Pr content, Hci increases, but Br decreases. (BH)m reaches the maximum value of 70.6 kJ&middotm-3 at x=0.6 - 0.8.