摘要
针对在提高NdFeB永磁材料耐蚀性时出现磁性能下降的问题,研究了通过混粉的方式添加Si3N4对烧结NdFeB磁体磁性能和耐腐蚀性的影响。研究结果表明,添加适量Si3N4可实现在磁体剩磁和最大磁能积提高的基础上,提高材料的腐蚀电位,并且在极化曲线的阳极部分相同电位条件下,具有较小的极化电流密度,从而达到改善NdFeB磁体耐腐蚀性的目的。
Si3N4 was added into the sintered NdFeB magnets in order to improve their magnetic properties and corrosion resistance.It was found that both remanence and maximum energy product were increased at minor additives,and coercitivity was almost invariable.Furthermore,corrosion potential of magnets with Si3N4 additives was more positive,and the magnets had lower polarization current density under the same applied potential in the anodic branch of the polarization curve than that of magnet without additives,which indicated that intergranular addition of Si3N4 could improve corrosion resistance of NdFeB magnets.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2007年第5期588-591,共4页
Journal of the Chinese Society of Rare Earths
关键词
NDFEB磁体
磁性能
抗腐蚀性能
稀土
NdFeB Magnets
magnetic properties
corrosion resistance
rare earths
