在工业生产线上制备24.5Nd-8Pr-0.55Nb-0.20Cu-0.65Al-1.15B-Fe+x％(质量分数)Dy2O3烧结磁体,分析了磁体密度、显微组织、取向度、磁性能以及抗弯强度与Dy2O3添加数量的关系.结果表明,随着x由0增加至0.8,2.4,磁体密度由7.470 g·cm-3略微上升至7.481 g·cm-3,而后明显下降至7.369 g·cm-3；平均晶粒尺寸由8.6 μm持续增大至9.3,10.8 μm,且晶粒尺寸分布不均匀；I006/I105比值则由1.305增大至1.394,1.688,磁体取向度明显提高.当x由0增加至1.2,2.4时,剩磁由1.244 T近似线性地降低到1.218,1.187 T；内禀矫顽力从1124.8 kA·m-1迅速提高到1307.8 kA·m-1,而后缓慢上升至1381.8 kA·m-1;磁体抗弯强度则从325 MPa缓慢降低至319 MPa,而后迅速下降至231MPa左右.添加Dy2O3使富钕液相的流动性及其对主相颗粒的润湿性变差,不利于富钕液相的均匀分布,阻碍磁体烧结致密化过程,促进烧结过程晶粒长大.适量添加Dy2O3,使内禀矫顽力显著提高,剩磁出现一定程度的下降；当Dy2O3添加数量比较大时,其提高内禀矫顽力的效应明显减小,同时磁体抗弯强度大幅度降低.
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