(1. 江西理工大学 材料科学与工程学院，赣州 341000；
2. 江西理工大学 机电工程学院，赣州 341000)
摘 要: 以双主相法制备不同Ce含量的烧结(CePrNd)-Fe-B磁体，研究不同回火温度下磁体的磁性能，并对微观组织断口进行BSE和EDS分析。结果表明：含Ce磁体的共晶温度和居里温度随Ce含量的增加呈减小的趋势；回火温度对烧结(CePrNd) -Fe-B磁体的剩磁影响不显著；Ce取代量为12%(质量分数)的磁体经回火温度410 ℃处理后，内禀矫顽力从762.6 kA/m上升到1357.2 kA/m，相应提高77.97%，方形度达到最佳值0.953。经410 ℃回火后，磁体主相晶粒间的微观结构形成的壳核结构，晶界分布着较多的条状富Nd相分布。富Nd相中的Ce含量增高，浸润性相对提高，因而有利于减少主相晶粒间的反向磁耦合，提高了室温和高温下磁体的内禀矫顽力。
关键字: Ce-Fe-B磁体；双合金；磁性能；回火
（1. School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;
2. School of Mechanical and Electrical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China）
Abstract:Resource-saving (PrNdCe)FeB sintered magnets with nominal composition (PrNd)CeFeB were prepared using a dual alloy method by mixing (PrNd)CeFeB with (PrNd)FeB powders. In this work, the magnetic properties at different annealing temperatures were investigated. The microstructures were examined by SEM and EDS. The results show that the eutectic temperature and the Curie temperature of (CePrNd)-Fe-B magnets have a downward tendency with increasing Ce content. When the magnets with substitution of 12% Ce were annealed at 410 ℃, the intrinsic coercivity increases from 762.6 kA/m to 1357.2 kA/m. The Hk/Hcj is improved to peak value of 0.953. The core-shelled structures form between the main phase grains in the magnet annealed at 410 ℃, in which more Nd-rich phases with strip-like distribute at the grain boundary. The wettability of Nd-rich phase is relatively improved with increasing Ce content, which is beneficial to reduce the reverse magnetic coupling between the main phase grains, thus the coercivity of (CePrNd)-Fe-B magnets at the room and high temperature is improved. Strip Nd-rich phase is discovered in the magnet under 410 ℃ annealing condition and Ce content is higher in the Nd-rich phase, the core-shell microstructure deforms which is beneficial to the coercivity of (CePrNd)-Fe-B magnets.
Key words: Ce-Fe-B magnet; dual alloy; magnetic property; annealing
