注射成型粘结钕铁硼磁体制造工艺研究∗

摘要

The injection molding of magnetic powder could cost-effectively mass-produce net shape magnets.The manufacture technology and properties testing method of composite powder and bonded NdFeB magnets from injection molding were described in detail.The effects of content of binder,additives and magnetic powder on the magnetic property,mechanical property and fluidity of injection molding magnets were investigated.Fur-thermore,the effect mechanism was revealed microcosmically.The injection molding bonded magnets were pre-pared by using the MQP-B rapidly quenching NdFeB magnetic powder and polyamide 12.The magnetic proper-ties are:B r =0.539 T,H cb =345.37 kA/m,H ci =681.02 kA/m,and (B H )max=47.37 kJ/m3 .%磁体的注射成型是一种高效生产的近净成型技术.详细说明了注射成型粘结钕铁硼磁体用复合粉和磁体的制造工艺及性能测试方法.研究了粘结剂、添加剂的含量以及磁粉装载量对注射成型磁体的加工性能、磁性能及力学性能等的影响规律.并从微观上揭示了其机理.用MQP-B快淬钕铁硼磁粉和尼龙12粘结剂制备出了磁性能Br为0．539T,Hcb为345．37kA/m,Hci为681．02kA/m,(BH)max为47．37kJ/m3的注射成型钕铁硼磁体.