【作者】 郭朝晖； 胡新建； 郭永权； 李卫；

【Author】 Guo Zhaohui, Hu Xinjian, Guo Yongquan, Li Wei (Division of Functional Materials, Central Iron & Steel Research Institute , Beijing 100081, China)

【机构】 钢铁研究总院功能材料研究所；

【摘要】 用粉末冶金方法制备了Sm0.76Er0.14Dy0.10(Co,Fe,Cu,Zr)7.22烧结磁体,研究了固溶温度对固溶态、终态磁体的微观结构以及终态磁体磁性的影响。结果表明:磁体的固溶态以无序ThCu7结构的1:7相为主相,1:7相具有很好的单轴各向异性,其易磁化方向为<002>方向;在 1413-1473 K范围内,随固溶温度的升高,固溶态的1:7相增多,终态的内禀矫顽力增加、退磁曲线方形度改辫;固溶温度超过1473 K,终态磁体中将形成Fe-Co软磁相,从而导致矫顽力显著降低。更多还原

【Abstract】 The effects of solution temperature on the microstructure and magnetic properties in solution state and final state of Sm0.76 Er0.14 Dy0.10 ( Co, Fe, Cu, Zr)7.22 sintered magnet prepared by the conventional powder metallurgy method were systematically studied using XRD, SEM and magnetic measurements. Powder XRD analysis shows that a main phase with disordered TbCu7-type structure is obtained in as-solutioned magnets. The 1:7 phase has a uniaxial magnetocrys-talline anisotropy with easy axis along < 002 > direc- tion. The content of the 1:7 main phase in as-solu-tioned magnets increases gradually with increasing solution temperature from 1413 to 1473 K, meanwhile the increase of the 1:7 phase concentration in as-solu-tioned magnets causes the enhancement of the intrinsic coercivity and the squareness of demagnetization curve of final magnets. If the solution temperature is more than 1473 K, the coercivity of the final magnets decreases significantly owing to the appearance of the soft magnetic Fe-Co phase.更多还原