Nd_2Fe_(14)C/α-Fe系稀土永磁材料微观组织及磁性能  

Microstructure and magnetic properties of Nd_2Fe_(14)C/α-Fe nanocomposite rare-earth magnets

作　　者：章莱[1] 陈秀云[1] 姜忠良[1] 杨昌平[1] 白飞明[1] 朱静[1] 

机构地区：[1]清华大学材料科学与工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2002年第12期1565-1568,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(50077010)

摘　　要：为了提高纳米双相稀土永磁材料Nd2Fe14B/α-Fe的性能,研究了一种新型合金Nd9.0Fe85.5Nb1.0B4.0C0.5。在合金中添加碳可提高矫顽力,添加钕可细化晶粒;合金的淬态微观组织显著影响其磁性能,合金中的部分预析出微晶相有助于在随后的热处理中获得均匀的微观组织;在热处理工艺中,晶化退火温度和时间对合金微观组织结构具有显著影响,并影响合金的磁性能。使用原子力/磁力显微镜观察Nd-Fe-(BC)/α-Fe纳米复合磁体的微观组织及磁畴结构,并由此对纳米双相稀土永磁材料中的交换耦合作用进行了解释。结果表明,最佳热处理工艺为:700℃保温15min,其性能为:剩磁1.381Wb.m-2,矫顽力518.05kA.m-1,剩磁比0.74,最大磁能积137.75kJ.m-3。The alloy Nd9.0Fe85.5Nb1.0B4.0C0.5 has been developed to improve the properties of nanocomposite rareearth magnets. Carbon was added to enhance coercivity. Neodymium was added to refine the grain structure since the asspun state microstructure can affect the alloy properties. The preprecipitate phase helps form a homogeneous structure which improves the alloy properties. An atomic force and magnetic force microscope was used to observe the microstructure and magnetic domain structure of the Nd2Fe14(BC)/αFe nanocompotites. The observation were used to analyze the exchange coupling in the alloy. The roll speed and annealing obviously affect the microstructure and magnetic properties of the alloy ribbons. The best annealing condition is at 700 ℃ for 15 min. The resulting properties are: remanence=1.381 Wb·m-2, coercivity=518.05 kA·m-1, remanence ratio=0.74, and product=137.75 kJ·m-3. 

关 键 词：Nd2Fe14(BC)/α-Fe 微观组织 磁性能 纳米双相稀土永磁材料 交换耦合作用 矫顽力 原子力显微镜 磁力显微镜 

分 类 号：TM273[一般工业技术—材料科学与工程]