【摘要】 烧结Nd-Fe-B磁体的磁性能及微观组织结构与其制备工艺尤其是烧结回火工艺密切相关。为此，制备了超高矫顽力的Nd-Fe-B烧结磁体，分析了回火工艺对其微观结构及磁性能的影响。结果表明，烧结Nd-Fe-B磁体的主相晶粒尺寸及形状主要由烧结工艺决定，高低温两级回火工艺会改善磁体晶界富Nd相分布，使其更均匀和连续分布在主相晶粒周围，有助于提高磁体的矫顽力。对于IVU16真空波荡器用高矫顽力烧结Nd-Fe-B磁体，经高低温两级回火后磁体Hcj提高了9.3%。更多还原

【Abstract】 The microstructure and magnetic properties of sintered Nd-Fe-B magnets are closely related to their preparation technology, especially sintering and annealing. To this end, Nd-Fe-B sintered magnets with ultra-high coercivity were prepared, and the effect of annealing process on their microstructure and magnetic properties was analyzed. Results show that Nd-Fe-B magnet grain size and shape of main phase is mainly decided by the sintering process, the two-stage of high and low temperature annealing will improve Nd-rich phase distribution in grain boundary, make it more even and continuously distribute around the main phase grain, effectively improving the intrinsic coercivity owing to magnetic decoupling. For high coercivity sintered Nd-Fe-B magnets used in IVU16 in-vacuum undulators, The H_cjof the magnet increases by 9.3 % after annealing.更多还原