Effect of Sm-rich liquid phase on magnetic properties and microstructures of sintered 2：17-type Sm-Co magnet

• Published in: Journal of rare earths Vol. 29; no. 10; pp. 934 - 938
• Main Author: 张文臣 赵睿 方以坤 周鸣鸽 朱明刚 李卫
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.10.2011; Division of Functional Materials, Central Iron and Steel Research Institute, Beijing 100081, China
• Subjects: 2:17-type sintered magnets; Boundaries; Coercive force; Coercivity; Liquid phases; Magnetic properties; Microstructure; Optimization; Rare earth metals; rare earths; scanning electron microscopy; Sm-rich liquid phase; 微观结构; 液相烧结; 磁体; 磁学性质; 磁性能; 钴; 高矫顽力; scanning electron microscopy; 2:17-type sintered magnets; magnetic properties; Sm-rich liquid phase; rare earths; 2∶17-type sintered magnets
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(10)60572-8

The effect of Sm-rich liquid phase （Sm2Co3） on magnetic properties and microstructure of 2：17-type Sin-Co magnet was studied. Three phases existed in liquid phase ingot, and took on white, dark grey and grey, respectively. It was found that the composition of the grey area was similar to the nominal one. Our results indicated that the optimal composition was obtained at 3 wt.% liquid phase added, and the magnetic properties were B~I 1.58 kGs, Hci〉26 kOe, （BH）m=29.51 MGOe. Br increased by 3%, Hci was 13 times larger, and （B/-/）m was 6 times bigger than none liquid phase magnets. Moreover, with the aging time decreasing from 20 to 8 h, the squareness of the demagnetization curves got better, while the coercivity of the samples decreased. It revealed that Sm（Co,Cu）5 phase also precipitated at particle boundaries. It maybe also enhanced the coercivity.