高铁含量2∶17型钐钴永磁材料研究进展  

Research Progress in High Iron Content 2∶17 SmCo Permanent Magnets

作　　者：曹俊 李仲 刘延丰 王志恒 王舒远 刘乔波 朱利强 熊俊杰 CAO Jun;LI Zhong;LIU Yanfeng;WANG Zhiheng;WANG Shuyuan;LIU Qiaobo;ZHU Liqiang;XIONG Junjie(Jiangxi Copper Technology Institute Co.,Ltd.,Nanchang 330096,China;Jiangxi Copper Co.,Ltd.,Nan-chang 330096,China)

机构地区：[1]江西铜业技术研究院有限公司,江西南昌330096 [2]江西铜业集团有限公司,江西南昌330096

出　　处：《铜业工程》2024年第4期142-156,共15页Copper Engineering

基　　金：国家重点研发计划项目(2023YFB3507501);江铜集团高性能钐基稀土永磁材料开发项目(YJY2023010)资助。

摘　　要：新能源汽车和轨道交通等领域的快速发展对永磁材料的耐温能力和最大磁能积提出了更高要求。基于2∶17型钐钴(SmCo)磁体的高居里温度优势,适当增加铁对钴的替代量,是开发耐高温磁能积磁体的重要途径。然而,当铁的质量分数超过20%时,磁体中结构缺陷大幅增加,退磁曲线方形度和矫顽力急剧恶化,制约了最大磁能积的提升。基于高铁含量2∶17型SmCo永磁材料的研究现状及问题,本文从晶内和晶界两个方面概述了磁体中常见的结构缺陷,并总结了结构优化与磁性能提升的新进展,最后对高铁含量SmCo永磁材料的研究趋势进行了展望。Motivated by the rapid development of electrical vehicles,hybrid electrical vehicles and high-speed trains,permanent mag⁃nets are required to have higher temperature resistance and larger maximum energy product simultaneously.Increasing the replacement content of Fe for Co suitably is an effective method to prepare magnets with high temperature resistance and large maximum energy product,based on the advantage of high Curie temperature of 2∶17-type SmCo magnets.When Fe>20%(mass fraction)in 2∶17-type SmCo magnets,however,the consequent structural defects may deteriorate the squareness of demagnetization curve and the coercivity,and in turn weaken the maximum energy product.In terms of the research status and problems of high iron content 2∶17-type SmCo magnets,this review provides the common structural defects in magnets from the perspectives of intragranular and grain boundaries,and summarizes the optimization methods and magnetic performance enhancement.The opportunities and challenges in the future of high iron content 2∶17-type SmCo magnets are also highlighted.

关 键 词：最大磁能积 钐钴磁体 高铁含量 结构缺陷 磁性能 

分 类 号：TM273[一般工业技术—材料科学与工程]