高磁性能反向挤压纳米晶Nd-Fe-B磁片研究
Research on High Magnetic Performance Nanocrystalline Nd-Fe-B Magnetic Sheet by Backward-Extrusion
DOI: 10.12677/MS.2023.1311103, PDF,   
作者: 岳 林, 郑立允*：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；苏 柳：邯郸市科学技术情报研究所，河北 邯郸；赵树国：邯郸职业技术学院机电工程系，河北 邯郸；方以坤, 朱明刚：钢铁研究总院有限公司，北京
关键词: 热变形Nd-Fe-B磁体；磁性能；微观结构；反向挤压； Hot-Deformed Nd-Fe-B Magnets； Magnetic Properties； Microstructure； Backward-Extrusion
摘要: 本文设计了一种新型的反挤压磁片模具，系统研究了反挤压法制备的纳米晶各向异性Nd-Fe-B磁片的显微组织、结构和磁性能，优化了磁片的反挤压成型工艺。在磁片的六个位置取样分析，探讨了反挤压磁片的成型机制与磁性能均匀性。结果表明，挤出高度为30 mm的磁片，在水平方向上磁片中间样品磁性能好于侧边样品，在垂直方向上磁片中部样品磁性能优于顶部和底部样品，并且反挤压磁片与反挤压磁环和传统镦粗磁体有相同的异质组织特征。同时发现，随着热压温度的提高，磁片的最大磁能积随之减小；随着热变形速度的增大，磁片的最大磁能积逐渐增大；变形量由46%增大至63%时磁片磁能积和均匀性提升明显。当热压温度为525℃、热变形温度850℃、变形速度0.07 mm/s时，变形率为63%的磁片磁性能最好，其Br、Hcj和(BH)max分别为12.81 kGs、10.66 kOe和38.03 MGOe。
Abstract: A set of novel backward-extrusion magnetic sheet molds were designed, and the microstructure, structure and magnetic properties of the nanocrystalline anisotropic Nd-Fe-B magnetic sheet prepared by backward-extrusion method were systematically studied, and the reverse extrusion molding process of magnetic sheet was optimized. The forming mechanism and magnetic uniformity of the backward-extruded magnetic sheet were explored by the samples from six positions of the magnetic sheet. The results show that the magnetic properties of the sample in the middle of the magnetic sheet with an extrusion height of 30 mm are better than those of the samples in both sides in the horizontal direction, and the magnetic performance of the sample in the middle of the magnetic sheet is better than that of the samples in top and bottom in the vertical direction. The backward-extrusion magnetic sheet has the same heterogeneous microstructure characteristics as the backward-extrusion magnetic ring and the traditional upsetting magnet. At the same time, it is found that the maximum magnetic energy products, (BH)max, of the magnetic sheet decreases with the increase of hot-pressing temperature. The (BH)max of the magnetic sheet gradually increases with the increase of deformation speed. When the deformation amount increases from 46% to 63%, the (BH)max and uniformity of the magnetic sheet is significantly improved. The magnetic sheet hot-pressed at 525˚C, hot-deformed at 850˚C with a deformation speed of 0.07 mm/s and a deformation rate of 63% obtain the best magnetic performance and its Br, Hcj and (BH)max are 12.81 kGs, 10.66 kOe and 38.03 MGOe, respectively.
文章引用：岳林, 苏柳, 赵树国, 方以坤, 朱明刚, 郑立允. 高磁性能反向挤压纳米晶Nd-Fe-B磁片研究[J]. 材料科学, 2023, 13(11): 941-952. https://doi.org/10.12677/MS.2023.1311103

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