HDDR NdFeB磁粉的表面缺陷与成因

HDDR NdFeB Magnet powder surface defects and their causes

利用扫描电子显微术（ＳＥＭ） 和Ｘ 射线衍射分析技术（ＸＲＤ） 研究了ＨＤＤＲ ＮｄＦｅＢ 磁粉的表面缺陷与成因．发现ＨＤＤＲＮｄＦｅＢ 磁粉的表面缺陷主要是表面微裂纹，其形成原因主要是Ｎｄ２Ｆｅ１４Ｂ化合物在氢化—歧化过程中体积膨胀所导致的内应力．

HDDR NdFeB magnet powder surface defects and their causes are investigated via Sanning Electron Microscopy(SEM) and X-Ray Diffraction Analysis and it is found that HDDR NdFeB magnet powder surface defects include surface micro-flaws and the cause for micro-flaw is internal stress, which is induced by the volume expanasion during hydrogenation-decomposition process of Nd 2Fe 14 B.