CAJ | 학술논문

采用热压/热变形法制备不同形变量的各向异性NdFeB磁体，通过对比分析磁体不同区域的微观结构及取向情况，研究了磁体的形变均匀性。结果表明，随着变形量增加，磁体径向（垂直模压方向）表面和中心磁性能差异及轴向（平行模压方向）上下磁性能差异均是先减小后增大。变形量为63%时，磁体已较为均匀，此时磁体内外的剩磁、矫顽力和磁能积差异分别为1.4%、7.9%和2.3%；上下的剩磁、矫顽力和磁能积差异分别为1.4%、14.2%和2.6%。变形量过大或过小均不利于获得均匀性好的磁体。
채용열압/열변형법제비불동형변량적각향이성NdFeB자체，통과대비분석자체불동구역적미관결구급취향정황，연구료자체적형변균균성。결과표명，수착변형량증가，자체경향（수직모압방향）표면화중심자성능차이급축향（평행모압방향）상하자성능차이균시선감소후증대。변형량위63%시，자체이교위균균，차시자체내외적잉자、교완력화자능적차이분별위1.4%、7.9%화2.3%；상하적잉자、교완력화자능적차이분별위1.4%、14.2%화2.6%。변형량과대혹과소균불리우획득균균성호적자체。
Anisotropic NdFeB magnets were prepared by hot-pressing/hot-deforming method with different deforming ratio. Microstructures and texture in the different region of the NdFeB magnets were characterized to study the deformation uniformity of the magnets. The experiments results show that the difference in magnetic properties firstly decreases and then increases between the inner and outer regions in the radial direction(vertical molding direction) and between the upper and lower region in the axial direction (parallel to the molding direction) with increasing deforming ratio. When deformation ratio is 63%, the magnet was relatively uniform. The difference of the remanence, coercivity and energy product in the radial direction and the axial direction were 1.4%, 7.9% and 2.3% and 0.7%, 11.7 % and 3.2%, respectively. Thus, preferable deforming ratio should be selected to prepare magnet with uniform structure and properties.