纳米晶复合Pr_2Fe_(14)B/α-Fe快淬薄带的织构与磁性  

Texture and magnetic properties of nanocomposite Pr_2Fe_(14) B/α-Fe melt-spun ribbons

作　　者：杨白[1] 沈保根[1] 赵同云[1] 孙继荣[1] 

机构地区：[1]中国科学院物理研究所磁学国家重点实验室和北京凝聚态物理国家实验室,北京100080

出　　处：《物理学报》2007年第6期3527-3532,共6页Acta Physica Sinica

基　　金：科技部重大基础研究前期研究专项基金(批准号:2004CCA04000)资助的课题~~

摘　　要：采用快淬方法制备了纳米晶复合Pr2Fe14B/α-Fe永磁薄带,研究了不同淬火速率对薄带织构和磁性的影响.通过改善快淬工艺,使得薄带中Pr2Fe14B相的晶粒在薄带的自由面形成显著的织构,Pr2Fe14B相晶粒易轴沿垂直于带面方向取向.分析了快淬凝固过程中Pr2Fe14B相的晶粒取向过程和机理,以及晶粒的大小和薄带结构的均匀性对薄带磁性的影响.对自由面有显著取向的薄带,进行酸蚀和打磨减薄处理,去除贴辊面未取向的部分,剩余部分为具有Pr2Fe14B相晶粒取向的各向异性薄带,Pr2Fe14B相取向使薄带的剩磁得到增强,矫顽力也有所提高.The effect of quenching rate on texture formation and magnetic properties of nanocomposite Pr2Fe14 B/α-Fe melt-spun ribbons has been investigated. The c-axis texture of Pr2 Fe14 B phase perpendicular to the ribbon plane was found on free surface of melt-spun ribbons prepared by optimized melt-spun technique. The formation of c-axis texture mainly result from the crystallites of Pr2 Fe14 B growing up along the flow of heat, which is induced by the contact of melt alloy with the surface of Cu wheel. The texture of Pr2Fe14 B phase does not penetrate through the thickness of melt-spun ribbons, and the incompletely textured structure does not bring about remanence enhancement. Anisotropic nanocomposite Pr2Fe14B/α-Fe ribbons were obtained by eliminating the unaligned part of the ribbons melt-spun at 16 m/s through acid-etching and polishing the side of ribbons in contact with the roller surface during spinning. Both Br and i Hc of the anisotropic ribbon measured along the direction perpendicular to the plane were improved obviously due to the c-axis alignment of Pr2 Fe14 B phase.

关 键 词：快淬 纳米晶复合Pr2Fe14B/α-Fe永磁薄带 织构 磁性能 

分 类 号：O482.54[一般工业技术—材料科学与工程]