快淬速度和Ce浓度对贫稀土Ce-Fe-B合金相组成及磁性能的影响  

Effect of Melt-Spinning Speed and Ce Content on the Phase Constitution and Magnetic Properties of Lean Rare Earth Ce-Fe-B Alloys

作　　者：王聪 杨富尧 刘洋 韩钰 高洁 孙浩 刘成宇 WANG Cong;YANG Fuyao;LIU Yang;HAN Yu;GAO Jie;SUN Hao;LIU Chengyu(State Key Laboratory of Advanced Power Transmission Technology,State Grid Smart Grid Research Institute Co.,Ltd.,Beijing 102209,China)

机构地区：[1]国网智能电网研究院有限公司先进输电技术全国重点实验室,北京102209

出　　处：《材料导报》2025年第7期140-144,共5页Materials Reports

基　　金：国家电网公司总部科技项目(5500-202258312A-2-0-QZ)。

摘　　要：Nd-Fe-B型永磁材料因其优异的室温磁性能而广泛应用于能源、轨道交通等领域。然而,材料的大量使用也造成了Nd、Pr等关键稀土元素的加速消耗和价格剧增。如何保证材料性能稳定的同时减少关键稀土元素的过度消耗是目前亟须解决的关键问题之一。选用高丰度稀土元素Ce替代关键稀土元素是一种有效的解决办法,对此,本工作用熔体快淬法制备了一系列贫稀土Ce_(1-x)Fe_(83+x)B_(6)(x=0~4)合金,并系统研究了快淬速度和Ce浓度对合金相组成及磁性能的影响。结果表明:在熔体快淬过程中,加快快淬速度可有效增加合金中的Ce_(2)Fe_(14)B硬磁相含量,进而提高合金整体的磁性能。在13~21 m/s的快淬速度内,Ce_(11)Fe_(83)B_(6)合金主要由Ce_(2)Fe_(17)和Ce_(2)Fe_(14)B相组成。随着快淬速度的加快,Ce_(2)Fe_(14)B相含量逐渐由16.89%增加至58.30%,相应地,合金的饱和磁极化强度J_s、剩磁J_(r)和矫顽力H_(c)也表现为增大的趋势,当快淬速度为19 m/s时,其磁性能达到最佳,此时J_s为0.84 T、J_(r)为0.41 T、H_(c)为106.72 kA/m。随着Ce浓度的降低,合金中的Ce_(2)Fe_(14)B相含量逐渐减少,相反地,生成了具有高饱和磁极化强度的α-Fe软磁相,尤其当Ce浓度为7%时,在软磁相含量增加以及与硬磁相间的交换耦合作用下,合金的J_s和J_(r)分别提高至1.18 T和0.44 T。Nd-Fe-B type permanent magnetic materials have been widely used in energy and rail transit due to their excellent room temperature magnetic properties.However,the continually growing demand for Nd-Fe-B magnets has greatly accelerated the depletion of critical rare earth elements including Nd,Pr,etc,which results in the rising prices of those critical rare earth elements.How to ensure the stability of the material pro-perties while reduce the excessive consumption of critical rare earth is one of the important issues that need to be solved urgently.The high-abundance rare earth Ce substitution for Nd is an effective solution.In this work,lean rare earth Ce_(11-x)Fe_(83+x)B6(x=0—4)alloys are prepared by melt-spinning method,and the effect of melt-spinning speed and Ce content on the phase constitution and magnetic properties of which are investigated.The results show that the increase of melt-spinning speed effectively increases the content of Ce_(2)Fe_(14)B hard magnetic phase during the melt-spinning process,which further improves the magnetic properties of the Ce11Fe83B6 alloy.In the melt-spinning speed range of 13—21 m/s,the Ce11Fe83B6 alloy is mainly composed of Ce_(2)Fe_(17) and Ce_(2)Fe_(14)B phases.With the increase of melt-spinning speed,the Ce_(2)Fe_(14)B phase content gradually increases from 16.89%to 58.30%,and accordingly,the saturation magnetic polarization J_(s),remanence J_(r) and coercivity H_(c) show an increasing trend.When the melt-spinning speed is 19 m/s,the Ce11Fe83B6 alloy presents the optimum magnetic properties with the J_(s)=0.84 T,J_(r)=0.41 T and H_(c)=106.72 kA/m.Furthermore,the Ce_(2)Fe_(14)B phase content gradually decreases with the decrease of Ce content.On the contrary,theα-Fe soft magnetic phase with high saturation magnetic polarization is gradually generated.When the Ce content decreases to the 7%,the increasing content of the soft magnetic phase and exchange coupling betweenα-Fe and Ce_(2)Fe_(14)B phase induce an increase of J_(s) and J_(r) to 1.18 T and 0.44 T,respectiv

关 键 词：Ce-Fe-B合金 快淬速度 Ce浓度 相组成 磁性能 

分 类 号：TG146.4[一般工业技术—材料科学与工程]