【摘要】 研究了HDDR各向异性NdFeB磁粉的粒度效应，发现尽管其粒度效应较低而适合制备粘结磁体，但比快淬NdFeB磁粉的粒度效应显著．在此基础上提出了表面缺陷层模型，即把磁粉颗粒从外表面到内部分成表面缺限层、过渡层和本体部分，磁粉磁性是各自磁性的叠加．更多还原

【Abstract】 The granularity effect for HDDR anisotropy NdFeB powder is studied.The results indicate that the granularity effect for the above powder is low and this powder adapts to preparing for bonded magnet. However, the granularity effect for HDDR anisotropy NdFeB powder is higher than melt-spun NdFeB powder. On the basis of above results, a magnetic powder defect layer model is put forward. The model considers that each magnetic powder consists of surface defect layer, transition layer and main body and that the overall magnetic properties of each magnetic powder result from the magnetic properties of the above each layer of the magnetic powder.更多还原