La和Sm共掺杂对烧结钕铁硼磁体微结构及热稳定性的影响  

Effect of La-Sm co-doping on the microstructure and thermal stability of sintered NdFeB magnets

作　　者：李欢 王俊勃 刘江南 吴树杰 董义 司鹏伟 LI Huan;WANG Jun-bo;LIU Jiang-nan;WU Shu-jie;DONG Yi;SI Peng-wei(School of Materials Engineering,Xi′an Polytechnic University,Xi′an 710048,China;Tianhe Magnetic Materials Technology Co,Ltd,Baotou 014010,China)

机构地区：[1]西安工程大学材料工程学院,陕西西安710048 [2]包头天和磁材科技股份有限公司,内蒙古包头014010

出　　处：《磁性材料及器件》2021年第5期57-61,共5页Journal of Magnetic Materials and Devices

摘　　要：采用粉末冶金工艺制备La和Sm共掺杂的钕铁硼磁体,研究了共掺杂前后磁体的微观结构、磁性能和热稳定性。结果表明,掺杂的La、Sm元素更倾向于进入晶界富Nd相,并没有改变磁体的相组成。与未掺杂磁体相比,掺杂La、Sm的磁体在室温下剩磁和最大磁能积有所提高,但内禀矫顽力有所降低。掺杂La、Sm的磁体在21.6℃至50~200℃范围内的剩磁温度系数α与矫顽力温度系数β的绝对值都低于未掺杂磁体,可见掺杂La、Sm后磁体的热稳定性有所提高。Nd-Fe-B magnets with La-Sm co-doping were prepared by powder metallurgy,and their microstructure,magnetic properties and thermal stability were investigated.The results show that the La-Sm co-doped elements tend to enter the Nd-rich phase at the grain boundary without changing the phase composition of the magnets.Compared with undoped magnets,the remanence and maximum energy product of La-Sm co-doped magnets are increased,but the intrinsic coercivity is decreased at room temperature.The absolute values of remanence temperature coefficientαand coercivity temperature coefficientβof La-Sm co-doped magnets are lower than those of undoped magnets in the range of 21.6℃to 50-200℃.It can be seen that the thermal stability of La-Sm co-doped magnets is improved.

关 键 词：烧结钕铁硼磁体 La和Sm共掺杂 微结构 磁性能 热稳定性 

分 类 号：TG146.454[一般工业技术—材料科学与工程]