HDDR各向異性NdFeB磁粉的粒度效應和表面缺陷層模型

Granularity Effect for HDDR Anisotropy NdFeB Powder and Magnetic Powder Surface Defect Layer Model

摘要: 研究了HDDR各向異性NdFeB磁粉的粒度效應,發現盡管其粒度效應較低而適合制備粘結磁體,但比快淬NdFeB磁粉的粒度效應顯著.在此基礎上提出了表面缺陷層模型,即把磁粉顆粒從外表面到內部分成表面缺限層、過渡層和本體部分,磁粉磁性是各自磁性的疊加.

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.