通过优化合金成分设计和改进速凝片铸技术、烧结技术,在工业生产线上成功实现了40EH高综合性能烧结钕铁硼磁体的批量生产.SEM观察结果表明,磁体显微组织致密、精细而均匀；其平均晶粒尺寸约为5～6 μm,不存在尺寸明显偏大的晶粒.在常温下,40EH烧结钕铁硼磁体的典型磁性能为Br=1.288 T,Hcb=996.8 kA·m-1,Hcj=2490kA·m-1,Hk =2018 kA·m-1,(BH)max=322.0 kJ·m-3；其Hcj/79.6kA·m-1+(BH)max/7.96 kJ·m-3=71.7.在473 K高温下,40EH烧结钕铁硼磁体的典型磁性能为Bx=1.056 T,Hcb=585.8 kA ·m-1,Hcj=641.8 kA·m-1,Hk=520.2 kA·m-1,(BH)max=200.9 kJ·m-3；其J-H退磁曲线方形度较好,B-H退磁曲线仍然表现出比较明显的线性特点.在295～473 K温度区间,其剩磁与内禀矫顽力的温度系数分别为-0.101和-0.417(％·K-1).当L/D =0.7时,在493 K保持2h磁体开路磁通不可逆损失为3.8％左右.批量生产的40EH烧结钕铁硼磁体具有优异的常温磁性能,同时表现出良好的温度稳定性.
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