热变形法制备高性能整体辐射取向永磁环

Fabrication of High-Performance Permanent Magnetic Radially Orientated Ringby Hot Deformed Method

采用快淬法制备了名义成分为Nd31FebalCo6.0Ga0.6Al0.2B0.9(质量分数)的磁粉,经过机械破碎后,真空热压成各向同性圆柱,然后进行热变形制备辐射取向整体永磁环。研究了热变形温度、磁体变形量对磁体磁性能的影响,并对磁体微观组织结构进行了SEM观察。结果表明,磁性能随热变形温度、变形量增加都是先增加后减小,这与磁体晶粒尺寸和取向有关。当热变形温度、变形量分别为800℃、80%时得到的磁体性能最佳,且具有良好的取向。永磁环表面磁场呈近似的正弦波分布,最高值达3200Gs以上。表面磁场均匀性和一致性均有所提高。

The melt-spinning technique was applied to preparation of the powders with nominal compositions of Nd31 FebalCO6.0 Ga0.6 Al0. 2 t30.9 （mass fraction）. After mechanical disruption, the powders were compacted and isotropic magnets were obtained by hot pressing. Then, high-performance permanent magnetic radially orientated ring were prepared by hot deformed method. The effects of temperature and deformation ratio on properties of magnets were studied. Microstructure of the magnets was observed by SEM. It was found that the magnetic properties increased firstly and decreased later with increasing of temperature and deformation ratio, which associated with the size and orientation of grains. High performance were obtained when deformation ration was 80~ at 800 ℃, and the high alignment can be obtained. In addition, the surface magnetic field of the magnetic ring was approximately sinusoidal distribution with a peak value of 3200 Gs, which is homogenously and uniformly.