Nd-Fe-B磁环反向热挤压成型工艺及性能调控  

Tuning of Forming Process and Properties of Backward Hot-Extruded Nd-Fe-B Magnetic Ring

作　　者：郑立允[1] 杜峰 李雅婧 赵立新[1,2] 左思源 赵树国 方以坤[4] 左志军[5] 

机构地区：[1]河北工程大学,稀土永磁材料与应用河北省工程研究中心,河北 邯郸 [2]河北工程大学,机械与装备工程学院,河北 邯郸 [3]邯郸职业技术学院机电工程系,河北 邯郸 [4]钢铁研究总院有限公司,功能材料研究院,北京 [5]廊坊京磁精密材料有限公司,河北 廊坊

出　　处：《材料科学》2024年第12期1672-1680,共9页Material Sciences

基　　金：国家重点研发计划(2022YFB3505600)。

摘　　要：采用反向热挤压技术,制备了外径39.5 mm、壁厚4.5 mm的Nd-Fe-B磁环,研究了挤压速度、变形压力和模具结构对反向热挤压Nd-Fe-B磁环磁性能、微观组织和相结构的影响,结果表明,随着挤压速度、变形压力的提高,磁环的磁性能先增大后减小,挤压速度0.05 mm/s、变形压力164 MPa下制备的磁环磁性能最佳,剩磁、矫顽力和最大磁能积分别为12.385 kGs、10.705 kOe、32.808 MGOe。采用具有凸台结构的反向热挤压模具制备的Nd-Fe-B永磁环比常规的反向热挤压模具制备的磁环的矫顽力更高且磁性能轴向均匀性更好。Nd-Fe-B magnetic ring with outer diameter of 39.5 mm and wall thickness of 4.5 mm was prepared by backward hot-extrusion technology. The effects of extrusion speed, deformation pressure and mold structure on the magnetic properties, microstructure and phase structure of the backward hot-extruded Nd-Fe-B magnetic ring were studied. The results showed that, with the increase of extrusion speed and deformation stress, the magnetic properties of the magnetic ring increased first and then decreased. The magnetic properties of the magnetic ring prepared using an extrusion speed of 0.05 mm/s and a deformation pressure of 164 MPa were the best, and its remanence, coercivity and maximum magnetic energy product were 12.385 kGs, 10.705 kOe and 32.808 MGOe, respectively. The Nd-Fe-B permanent magnet prepared by the backward hot-extrusion mold with a boss structure has higher coercivity and better axial uniformity of magnetic properties than the magnetic ring prepared by the conventional backward hot-extrusion mold.

关 键 词：反向热挤压 Nd-Fe-B磁环 磁性能 凸台结构 轴向均匀性 

分 类 号：TM2[一般工业技术—材料科学与工程]