Magnetic properties and resistivity of a 2:17-type SmCo magnet doped with ZrO_2 |
| |
| Affiliation: | 1.Laboratory of Rare-Earth Magnetic Functional Materials, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;2.College of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, China |
| |
| Abstract: | In order to counteract the demagnetization caused by eddy current loss, widespread attention has been devoted to increasing the resistivity of permanent magnets. We prepared 2:17-type Sm Co magnets doped with different ZrO_2 contents and investigated the influence of the ZrO_2 content on the magnetic properties and resistive anisotropism. The results showed that not only was the resistivity of the magnet improved, but, in addition, the coercivity of the magnet was significantly increased. The microstructure was studied with TEM, which showed that ZrO_2 doping was able to cause a decrease in the lamellar phase density and the growth of cellular structures. The increased grain boundaries and Sm_2O_3 phases were favorable to the improvement of resistivity. The decrease of the lamellar phases caused a narrowing of the resistive anisotropism. The additional Cu in the center of the cellular boundaries was the main reason for the enhancement of Hcj.However, an excessive amount caused an increase of the Zr_6(Fe Co)_(23) phase and a deterioration of the cellular structure,thereby leading to a decrease in coercivity. |
| |
| Keywords: | 2:17-type SmCo magnets resistivity coercivity cellular structure |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《中国物理 B》浏览原始摘要信息 |
|
点击此处可从《中国物理 B》下载免费的PDF全文 |
|
