Pr_2Fe_(14)(C,B)/α-(Fe,Co)型纳米晶复合磁体的结构与磁性  

Structure and magnetic properties of Pr_2Fe_(14)(C,B)/α-(Fe,Co)-type nanocomposite ribbons

作　　者：李安华[1] 赖彬[1] 王会杰[1] 朱明刚[1] 李卫[1] 

机构地区：[1]钢铁研究总院功能材料研究所,北京100081

出　　处：《物理学报》2011年第2期655-660,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:50804011;50931001)资助的课题~~

摘　　要：研究了PrxFe82-x-yTiyCo10B4C4(x=9—10.5;y=0,2)纳米晶薄带的结构与磁性.结果表明,所有薄带皆主要由2∶14∶1,2∶17和α-(Fe,Co)三相组成.对于y=0的合金,其内禀矫顽力随Pr含量x的增加而增加,剩磁随Pr含量x的增加而减小.以Ti置换部分Fe(y=2),合金的磁性能得到显著提高,表现为:添加Ti后,合金的剩磁Br基本不降低,x=10.5时合金的Br值甚至有较明显的提高;同时添加Ti后,合金的内禀矫顽力及退磁曲线的方形度都明显改善.当x=10.5,y=2时,合金薄带的磁性能达到最佳值为:Br=9.6kGs(1Gs=10-4T),iHc=10.2kOe(1Oe=79.5775A/m)和(BH)max=17.4MGOe.随着Pr含量的提高,合金中的硬磁相2∶14∶1的含量相对增加,内禀矫顽力提高;而Ti置换Fe抑制了软磁相α-(Fe,Co)在快淬和热处理过程中的优先长大,使合金中软磁相和硬磁相的晶粒尺寸及比例趋向最佳组合,交换耦合作用明显增强.The phase evolution,microstructure and magnetic properties of PrxFe82-x-yTiyCo10B4C4（x = 9—10. 5; y = 0,2） melt-spun ribbons have been investigated. All ribbons are mainly comprised of the 2∶ 14∶ 1,2∶ 17 and α-（Fe,Co） phases. For the group of Ti-free ribbons （ y = 0 ）,the coercivity increases with increasing x while the remanence decreases with increasing x. When 2 at. % Ti is substituted for Fe in the Ti-free ribbons,the magnetic properties are remarkably enhanced. The coercivity and squareness of demagnetization curve of the Ti-substitution ribbons are substantially improved without a sacrifice of remanence （ except for x = 9）,the remanence even obviously increases at x = 10. 5. The optimal magnetic properties of Br = 9. 6 kGs （1 Gs = 10-4T）,iHc = 10. 2 kOe （1 Oe = 79. 5775 A /m）,（ BH） max = 17. 4 MGOe have been obtained in Ti-substituted Pr10. 5 Fe69. 5 Ti2Co10 B4C4 group. The volume fraction of the 2 ∶ 14 ∶ 1 phase increases with increasing x,which leads to an increase of coercivity. Ti-substitution suppresses the grain growth of α-（ Fe,Co） phase during annealing process,which makes the volume ratio of magnetically hard phase and soft phase and grain size tend to have optimal values,and the intergranular exchange coupling substantially enhances.

关 键 词：纳米晶永磁材料 Pr2Fe14(C B) Ti添加 交换耦合 

分 类 号：O482.5[理学—固体物理]