1. National Engineering Research Center for Magnetic Materials, Beijing 102600, China 2. Key Laboratory of Rare Earth Permanent Magnet Materials, Hefei 231501, Anhui, China 3. Functional Materials Research Institute, Central Iron & Steel Research Institute, Beijing 100081, China
Abstract：The magnetic properties and microstructures of Sm2Co17- based sintered permanent magnet annealed at different isothermal annealing temperatures Tia (785, 800, 815, 830℃), made of as- homogenized ingot, with the nominal composition Sm(CobalFe0. 245Cu0. 07Zr0. 02)7. 8 (atom fraction%), have been investigated. The results showed that, with the isothermal annealing temperatures increasing from 785℃ to 830℃, the remanence Br almost keeps constant (~1. 157T), the intrinsic coercivity Hcj first increases, and then decreases. TEM images indicate that there are two differences between the microstructures of the final state magnet annealed at 785℃ and 815℃, respectively: firstly, the average cell size of the final magnet annealed at 785℃ is about 115nm, while that of the final magnet annealed at 815℃ is about 82nm; secondly, the volume fraction of 1∶5H cell boundary phase of the final magnet annealed at 785℃ is smaller than that of the final magnet annealed at 815℃. These two reasons above are considered to be two main reasons accounting for the maximum Hcj of the final state magnet annealed at 815℃.
孙威 朱明刚 张鹏杰 方以坤 朱代漫 李亚峰 刘辉 刘荣明 李炳山. 单相铸锭制得高剩磁Sm2Co17基永磁合金磁性能和微观结构[J]. , 2019, 26(1): 28-32.
SUN Wei,,ZHU Ming- gang,ZHANG Peng- jie,FANG Yi- kun,ZHU Dai- man,LI Ya- feng,LIU Hui,LIU Rong- ming,LI Bing- shan. The magnetic properties and microstructure of Sm2Co17- type sintered permanent magnetic alloy with high remanence made of single- phase ingot. , 2019, 26(1): 28-32.
2019, Vol. 26 
