添加润滑剂对烧结钕铁硼磁体性能的影响

研究了烧结钕铁硼永磁材料的粉末流动性及添加润滑剂对粉末流动性与磁体取向度和磁性能的影响.结果表明:影响松装状态磁粉流动性的主要因素是粉末颗粒团聚,影响密实磁粉流动性的主要因素是颗粒间的摩擦力.添加适量的润滑剂可以防止粉末颗粒团聚、明显地减小摩擦力,改善粉末流动性,提高磁体的取向度、剩磁与磁能积.采用添加润滑剂和橡皮模等静压制成型工艺,批量生产的烧结钕铁硼磁体性能达到:Br=1.457 T,jHc=1148 kA/m(14.43 kOe),(BH)max=408 kJ/m3(51.3 MGOe).

Effects of the addition of lubricant on the magnetic properties of NdFeB sintered magnets

Powder flowability and effects of adding lubricant on the powder flowability, the alignment degree and the magnetic properties of sintered NdFeB magnet have been studied. The results show that the main factor affecting powder flowability is the aggregation of powder particles while the powders are in incompact state and the friction between the powder particles while the powders are in compact state. The addition of lubricant with suitable dose can slightly prevent the aggregation of powders, obviously decrease the friction between the powder particles, improve the powder flowability, and increase the alignment degree, remanent magnetization and energy product density of sintered magnets. By adding suitable lubricant dose and adopting rubber isostatic pressing (RIP), we have succeeded in mass producing the sintered NdFeB magnet with high hard magnetic properties of Br=1.457 T, iHc=1148 kA/m(14.43 kOe), (bH)max=408 kJ/m3(51.3 MGOe).