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应用 SEM、EDAX观察分析了烧结 Nd Fe B磁体金属 Ni镀层麻点、洼坑等缺陷处的基体显微组织 ,发现镀层缺陷部位磁体显微组织皆为异常粗大晶粒区。从磁体制造工艺角度讨论了镀层缺陷产生的原因 ,提出了避免镀层缺陷的途径。
SEM and EDAX were used to observe and analyze the microstructure of the matrix of Ni-plated NdFeB magnets. The microstructure of the magnet in the defects of the sintered NdFeB magnets was abnormal and coarse grains. The reasons of the coating defects are discussed from the perspective of the manufacturing process of the magnet, and the ways to avoid the coating defects are proposed.