摘要
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5～6μm,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=2490 kA.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Br=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2 h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。
By optimizing the alloy compositions, and improving the strip-casting and sintering techniques, 40EH sintered Nd-Fe-B magnets were successfully obtained from common commercially-available raw materials on the mass-production line. SEM analysis showed that the mass-produced high-performance sintered Nd-Fe-B magnets possessed a dense, fine-grained and homogeneous micro- structure with an average grain size of about 5 - 6 μm, and in which there were no abnormally large grains. Typical magnetic properties for 40EH sintered Nd-Fe-B magnets at room temperature were B, = 1. 288 T, Hcb = 996.8 kA ·m^ -1, Hci = 2490 kA ·m^ -1, Hk = 2018 kA ·m^ -1, （BH） max = 322.0 kJ.m -3 ; the value of HcJ79.6kA.m - 1 ＋ （BH） max/7.96 kJ·m^ -3 = 71.7. And typical magnetic properties for 40EH sintered Nd-Fe-B magnets at473 K were Br =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; the J-H demagnetization curve had a relatively satisfactory squareness and the B-H demagnetization curve still had a relatively high linearity. In the temperature range of 295 - 473 K, the temperature coefficients of remanence and intrinsic co- ercivity were - 0. 101 and - 0.417 （ %·K - 1 ）, respectively. The irreversible flux loss of the magnet with L/D = 0.7 was around 3.8% after being exposed at 493 K for 2 h. The mass-produced 40EH sintered Nd-Fe-B magnets exhibited excellent room temperature mag- netic properties and ideal thermal stability.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2013年第2期249-254,共6页
Chinese Journal of Rare Metals
基金
国家科技部高技术研究发展计划(863)(2010AA03A401)资助
关键词
烧结钕铁硼磁体
合金铸片
矫顽力
温度稳定性
显微组织
sintered Nd-Fe-B magnets
strip-cast alloys
coercivity
thermal stability
microstructure
