高电阻率稀土永磁材料研究进展  

Recent Development of High Electrical Resistivity Rare Earth Permanent Magnetic Materials

作　　者：郑立允[1,2] 房刊 李卫 ZHENG Liyun;FANG Kan;LI Wei(Division of Functional Materials,Central Iron and Steel Research Institute,Beijing 100081,China;College of Materials Science and Engineering,Hebei University of Engineering,Handan 056038,China)

机构地区：[1]钢铁研究总院功能材料研究所,北京100081 [2]河北工程大学材料科学与工程学院,河北邯郸056038

出　　处：《中国材料进展》2018年第9期645-652,共8页Materials China

基　　金：国家"973"资助项目(2014CB643701);河北省自然科学基金资助项目(E2017402039;E2017402139)

摘　　要：高性能低成本稀土永磁材料是现代技术和国防尖端技术的关键组成部分,尤其是在牵引电机和发动机等旋转电力设备中。但是其相当高的电导率造成服役过程中槽纹波、逆变器等产生较大的涡流损耗,从而导致磁体的温度升高,甚至引起热退磁。为解决磁体的涡流及温升问题,近年来,围绕高电阻率稀土永磁材料展开了一系列研究工作。对掺杂剂种类、无机绝缘包覆技术和高电阻率复合磁体制备技术等方面进行了综述分析,同时总结了粘结、热压和烧结高电阻率稀土永磁材料的研究现状,并展望了高电阻率复合磁体的发展前景。Rare earth magnetic materials with high performance and low cost are the critical components of modern technology and high-end defense techniques,especially for the rotating electrical machines such as traction motors and generators.But their fairly higher conductivity leads to larger eddy current losses due to slot ripple and inverter during the service process,resulting in temperature rise and even thermal demagnetization.To solve the eddy current and temperature rise,the systematic investigations have been done on rare earth permanent magnetic materials with high electrical resistivity.In this paper,recent developments in dopants,insulation coating techniques of magnetic powders and forming techniques for high electrical magnets have been reviewed.The research on the bonded,die-upset and sintered rare earth permanent magnetic materials with high electrical resistivity have been summarized.Prospects of developing high electrical resistivity composite magnets are presented.

关 键 词：稀土永磁材料 电阻率 最大磁能积 掺杂 绝缘磁体 液相化学包覆 

分 类 号：TM273[一般工业技术—材料科学与工程]