Ho-Nd-Fe-B磁体的性能与结构  

Properties and structure of Ho-Nd-Fe-B magnets

作　　者：曹玉杰 刘友好 徐光青[1,3] 张鹏杰 刘家琴 陈静武 衣晓飞 吴玉程 CAO Yu-jie;LIU You-hao;XU Guang-qing;ZHANG Peng-jie;LIU Jia-qin;CHEN Jing-wu;YI Xiao-fei;WU Yu-cheng(School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China;State Key Laboratory of Rare Earth Permanent Magnet Materials,Hefei 231500,China;Key Laboratory of Advanced Functional Materials and Devices of Anhui Province,Hefei 230009,China;BGRIMM Magnetic Materials and Technology(Fuyang)Co.,Ltd.,Fuyang 236000,China;Institute of Industry and Equipment Technology,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009 [2]稀土永磁材料国家重点实验室,合肥231500 [3]先进功能材料与器件安徽省重点实验室,合肥230009 [4]北矿磁材(阜阳)有限公司,阜阳236000 [5]合肥工业大学工业与装备技术研究院,合肥230009

出　　处：《中国有色金属学报》2021年第4期938-944,共7页The Chinese Journal of Nonferrous Metals

基　　金：安徽省科技重大专项资助项目(17030901063,18030901098);安徽省重点研究和开发计划资助项目(1804a09020068);北京矿冶科技集团有限公司重点基金资助项目(20190898000002)。

摘　　要：采用Ho部分取代Nd,制备了不同Ho含量的Ho-Nd-Fe-B磁体,研究了Ho含量对Ho-Nd-Fe-B磁体的磁性能、温度稳定性和微观结构的影响。结果表明:Ho的添加有助于改善主相和富稀土相之间的浸润性,优化晶界富稀土相的分布,提高了磁体的内禀矫顽力,并改善了磁体的温度稳定性,但磁体的剩磁有所下降。当Ho含量(质量分数)由0增加到21.0%时,H_(cj)由1281 kA/m增加到1637 kA/m,B_(r)由1.342 T降至0.919 T;在20~100℃范围内,磁体的剩磁温度系数|α|和矫顽力温度系数|β|分别由0.119%/℃和0.692%/℃降低到0.049%/℃和0.540%/℃;在180℃烘烤2 h后的磁通不可逆损失由54.80%降低到29.17%。Ho-Nd-Fe-B magnets with different Ho contents were prepared by Ho substitution for part of Nd.The effects of Ho contents on the magnetic properties,temperature stability and microstructure of Nd-Fe-B magnets were studied.The results show that the addition of Ho is helpful to improve the wettability between the main phases and the rare-earth rich(RE-rich)phases,and optimizes the distribution of rare-earth rich(RE-rich)phases in grain boundary,and improves the intrinsic coercivity and the temperature stability of the magnets,but the remanence of the magnets decreases.When Ho content(mass fraction)increases from 0 to 21.0%,H_(cj) increases from 1281 kA/m to 1637 kA/m,and B_(r) decreases from 1.342 T to 0.919 T;the remanence temperature coefficient |α| and coercivity force temperature coefficient |β|of magnets decrease from 0.119%/℃and 0.692%/℃to 0.049%/℃and 0.540%/℃,respectively,in the range of 20−100℃.And the irreversible flux loss after being baked at 180℃for 2 h decreases from 54.80%to 29.17%.

关 键 词：Ho-Nd-Fe-B磁体 磁性能 温度稳定性 微观结构 

分 类 号：TM271[一般工业技术—材料科学与工程]