1:12型SmFe永磁材料成分设计与矫顽力机制  

Composition design and coercivity mechanism of 1∶12-type SmFe permanent magnets

作　　者：付萌萌 陈炜 贺杨堃[1] 蒋成保[1] FU Mengmeng;CHEN Wei;HE Yangkun;JIANG Chengbao(School of Materials Science and Engineering,Beihang University,Beijing 100191,China)

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100191

出　　处：《航空材料学报》2024年第5期37-47,共11页Journal of Aeronautical Materials

基　　金：国家自然科学基金项目(52121001,52031001)。

摘　　要：稀土永磁材料大规模应用于航空航天、能源技术、交通运输等重要领域,是现代科技不可或缺的关键材料。1:12(ThMn_(12))型SmFe永磁材料拥有与钕铁硼相媲美的磁性能和更高的居里温度,是目前已报道永磁材料中理论磁能积最高的材料,且组成元素储量丰富,极具应用潜力。但是该材料存在热稳定性差的难题,导致矫顽力低,无法发挥其潜力。本文分析1:12相热稳定性差的原因,总结占据不同晶位的合金元素对相稳定性和内禀磁性能的影响规律;剖析影响合金矫顽力的关键因素,揭示制备工艺与矫顽力的内在联系;论述通过多晶位元素共掺杂、控制冷却速度、晶界包覆等方法获得高磁能积1:12型SmFe永磁体的研究思路,为稀土永磁的发展提供重要参考。Rare earth permanent magnet materials are widely applied in critical fields such as aerospace,energy technology,and transportation,serving as critical materials in modern technology.The 1∶12-type(ThMn_(12))SmFe permanent magnet material exhibits magnetic properties comparable to Nd_(2)Fe_(14)B and possesses a higher Curie temperature.It exhibits the highest theoretical magnetic energy product among permanent magnets.Moreover,it consists of abundant elements,showing significant potential for application.However,this material faces challenges in thermal stability,leading to low coercivity,thus hindering its potential.This paper first analyzed the reasons for the poor thermal stability of the 1∶12 phase,concluding the influence of elements occupying different crystallographic sites on phase stability and intrinsic magnetic properties.Subsequently,we analyzed the key factors affecting the coercivity,elucidating the inherent relationship between preparation processes and coercivity.Finally,we proposed strategies for achieving high magnetic energy products in 1∶12 type SmFe permanent magnets,such as multi-site element Codoping,control of cooling rate,and grain boundary encapsulation,providing important references for developing rare earth permanent magnets.

关 键 词：1:12型永磁材料 稳定性 矫顽力 成分设计 制备方法 

分 类 号：V252[一般工业技术—材料科学与工程] TM273[航空宇航科学与技术—航空宇航制造工程]