MnBi永磁合金研究进展  

Recent research progress on MnBi permanent magnetic alloy

作　　者：李兵兵[1] 马毅龙[1] 陈登明[1] 李春红[1] 孙建春[1] 郑强[1] 银学国 张毅隆 LI Bing-bing;MA Yi-long;CHEN Deng-ming;LI Chun-hong;SUN Jian-chun;ZHENG Qiang;YIN Xue-guo;ZHANG Yi-long(School of Metallurgy and Materials Engineering,Chongqing University of Science and Technology,Chongqing 401331,China)

机构地区：[1]重庆科技学院冶金与材料工程学院,重庆401331

出　　处：《磁性材料及器件》2018年第4期60-66,70,共8页Journal of Magnetic Materials and Devices

基　　金：国家自然科学基金青年科学基金资助项目(51201191);重庆市教委科研资助项目(KJ1501303);重庆科技学院院士工作站合作项目(CKYS2014Z02);重庆科技学院重点项目培育基金(CK2015Z12);重庆科技学院研究生科技创新计划项目(YKJCX1620203);重庆科技学院研究生科技创新计划项目(YKJCX1620204)

摘　　要：Mn Bi合金具有显著的铁磁性及磁光效应,可用作永磁和磁光存储材料。Mn Bi磁性合金具有高的室温单轴磁各向异性和反常的正的矫顽力温度系数,有希望成为高温应用(~200℃)磁性材料而引起了广泛关注。但由于其相转变的复杂性,制备高纯度、高磁性能的Mn Bi合金仍存在一定的难度。近年来许多研究者对Mn Bi磁性合金的热处理工艺、制备工艺以及复合磁体等方面进行了一系列的研究。截至目前,已经基本可以批量化生产高纯高性能Mn Bi磁粉,同时所制备Mn Bi单相合金的最大磁能积(BH)max已经达到了8.4 MGOe,所制备Mn Bi复合磁体的最大磁能积(BH)max也达到了最高的18 MGOe。这些研究极大地促进了Mn Bi磁体的发展,为Mn Bi永磁体的工业化生产应用奠定了基础。本文综述了近年来高性能Mn Bi永磁材料的研究进展。MnBi alloy has significant ferromagnetism and magneto-optical effect,and can be used as permanent magnetic and magneto-optical materials.MnBi magnetic alloy has attracted much attention as a desirable magnetic material for high temperature(~200℃)applications because of its high uniaxial magnetic anisotropy at room temperature and unusual positive temperature coefficient of coercivity.However,because of complexity of its phase transition,there are still some challenges to fabricate MnBi alloy with high purity and excellent magnetic properties.In recent years,many studies have been reported about preparation of MnBi alloys by improving heat treatment process,preparing technology and hybrid magnet.Up to now,MnBi magnetic powder with high purity and excellent magnetic properties can be produced in small amount,and the energy product(BH)max is 8.4 MGOe and 18 MGOe for MnBi single alloy and MnBi hybrid magnet,respectively.These studies greatly promote the development of MnBi,and are also conductive to the industrial production and application of MnBi permanent magnetic alloys.The research progress of MnBi preparation in recent years was reviewed in this paper.

关 键 词：MnBi永磁合金 磁性粉末 大块磁体 复合磁体 磁性能 

分 类 号：TM273[一般工业技术—材料科学与工程]