渗镝处理工艺参数对烧结Nd-Fe-B磁体结构与磁性能的影响  

Dependence of microstructure and magnetic properties of sintered Nd-Fe-B magnets on the Dy-diffusion process parameters

作　　者：楼俊奕 熊军 田元丰 王志强 邱娴 刘湘涟[1] LOU Jun-yi;XIONG Jun;TIAN Yuan-feng;WANG Zhi-qiang;QIU Xian;LIU Xiang-lian(School of Materials and Chemistry Engineering,Ningbo University of Technology,Ningbo 315211,China;Ningbo Jintan Magnetic Materials Industry Company Limited,Ningbo 315806,China;Zhejiang Zhonghang New Materials Science and Technology Company Limited,Ningbo 315400,China)

机构地区：[1]宁波工程学院材料与化学工程学院,浙江宁波315211 [2]宁波金坦磁业有限公司,浙江宁波315806 [3]浙江中杭新材料科技有限公司,浙江宁波315400

出　　处：《磁性材料及器件》2019年第6期5-8,56,共5页Journal of Magnetic Materials and Devices

摘　　要：应用Dy-Fe-Al合金粉末作为渗材,对于工业生产的48H烧结Nd-Fe-B磁体进行渗镝处理试验。结果表明,渗镝热处理温度、时间是影响渗镝处理磁体磁性能的重要工艺因素;在渗镝热处理之后,磁体表面区域主相晶粒表现出长大的趋势。经过在1173 K保持5 h的渗镝热处理,22.58 mm×13.78 mm×5.08 mm(长×宽×厚)48H磁体渗入的镝元素质量分数约为0.52%,其内禀矫顽力上升幅度达到564.7 kA/m,同时剩磁下降0.037 T。与基础磁体相比较,渗镝处理磁体的温度稳定性得以显著改进。Grain boundary diffusion process experiments with Dy-Fe-Al alloy powders were conducted on mass-produced 48 H sintered Nd-Fe-B magnets.Based on the experimental results,diffusion temperature and time have marked effects on the magnetic properties of grain boundary diffusion processed magnets;Nd2 Fe14 B grains in the surface region of grain boundary diffusion processed magnets show a growth tendency.A grain boundary diffusion process at 1173 K for 5 h led to a Dy content increase of about 0.52 wt%,and produced a 564.7 kA/m intrinsic coercivity increase and a 0.037 T remanence decrease for 22.58 mm×13.78 mm×5.08 mm 48 H base magnets.Compared with that of the base magnets,the temperature stability of grain boundary diffusion processed magnets is markedly improved.

关 键 词：烧结ND-FE-B磁体 渗镝热处理 微观结构 磁性能 

分 类 号：TM273[一般工业技术—材料科学与工程]