(北京科技大学 材料科学与工程学院, 北京 100083)
摘 要: 研究了HDDR工艺的吸氢歧化（HD）和脱氢再复合(DR)阶段在HDDR Nd13Fe80B7各向异性形成过程中的作用。 结果发现： 短的吸氢歧化时间、 高的脱氢温度和缓慢的脱氢处理均有助于Nd13Fe80B7材料获得各向异性； 当吸氢歧化时间过长时, HDDR Nd13Fe80B7成为各向同性的材料, 即使高的脱氢温度和缓慢的脱氢处理也不能使它获得各向异性。 这表明合适的吸氢歧化是HDDR Nd13Fe80B7各向异性形成的关键, 而高的脱氢温度和缓慢的脱氢处理是HDDR NdFeB获得高各向异性的保证。 使用XRD和TEM对Nd13Fe80B7材料吸氢歧化过程的观察表明, 除NdH2、 Fe和Fe2B外， 没有发现其它相, HDDR Nd13Fe80B7各向异性的产生与条纹状的歧化组织相关。
关键字: HDDR； Nd13Fe80B7； 各向异性
anisotropy in Nd13Fe80B7
（School of Materials Science and Engineering,
University of Science and Technology Beijing,
Beijing 100083, China）
Abstract:The function of disproportionation and desorption stages of HDDR process in the formation of magnetic anisotropy was studied. Experiments exhibit that relatively short disproportionation time, high desorption temperature and slow desorption treatment are beneficial to attainment of anisotropy. When disproportionation time is longer, HDDR Nd13Fe80B7 magnetic powder becomes isotropic, and high desorption temperature and slow desorption treatment cannot make them obtain anisotropy. This indicates that the origin of anisotropy in NdFeBtype HDDR material is contributed by disproportionation stage, and high desorption temperature and slow desorption treatment are the guarantee of obtaining strong anisotropy. No other phase except NdH2, α-Fe and Fe2B has been found in the disproportionation step with XRD and TEM, and the formation of HDDR Nd13Fe80B7 anisotropy may be related to the early lamella disproportionation structure.
Key words: HDDR； Nd13Fe80B7； anisotropy
