成形工艺对粘结NdFeB磁体结构和磁性能的影响  

Effect of presing processes on structure and magnetic properties of the bonded NdFeB magnet

作　　者：李军[1] 刘颖[1] 高升吉[1] 涂铭旌[1] 

机构地区：[1]四川大学材料科学与工程学院,成都610065

出　　处：《粉末冶金技术》2005年第2期112-115,共4页Powder Metallurgy Technology

基　　金：国家"863"计划资助项目(2001AA324030);四川省青年科技基金(03ZQ026-006

摘　　要：在粘结NdFeB磁体模压成形过程中存在较大的压力损失,引起磁体密度分布不均匀,致使磁体密度减小。本文研究了压制压强、预压成形和压制方式等对粘结NdFeB磁体结构和磁性能的影响及机理。研究表明:随着压制压强提高,粘结NdFeB磁体的密度和磁性能显著增大;粒度配合、预压成形和双向压制等办法均可增大粘结NdFeB磁体的密度和磁性能;在适当的压制压强下,将粒度配合、预压成形及双向压制工艺结合,制备出密度达到6.5g/cm3、磁能积达到104kJ/m3的粘结NdFeB磁体。Greater pressure loss in pressing process of bonded NdFeB magnet causes heterogeneous distribution and decrease of magnet density. Effect of pressing pressure,preforming and pressing mode on structure and properties of bonded NdFeB magnet were investigated. Results show that density and magnetic properties of the magnet markedly increase with increasing pressing pressure. Combination of particle size,preforming and double action pressing etc.can also improve the density and properties of the magnet. Bonded NdFeB magnet with density of 6.5g/cm 3 and magnetic energy product of 104kJ/m 3 was obtained under proper conditions.

关 键 词：磁性能 体结构 粘结NDFEB磁体 成形工艺 压力损失 成形过程 密度分布 双向压制 压制工艺 不均匀 体密度 压强 预压 磁能积 增大 粒度 

分 类 号：TM273[一般工业技术—材料科学与工程] F270.7[电气工程—电工理论与新技术]