High-temperature oxidation resistance and magnetic properties of Si-doped Sm<sub>2sub>Co<sub>17sub>-type magnets at 500 掳C
- 作者：Lili Liu ; Tingyan Jin ; Chengbao Jiang<sup> ; sup><sup>jiangcb@buaa.edu.cnsup>
- 关键词：Sm2Co17-type magnet ; Silicon addition ; Oxidation resistance ; High-temperature magnetic property
- 刊名：Journal of Magnetism and Magnetic Materials
- 出版年：2012
- 期刊代码：31_03048853
- 类别：ph
- 出版时间：July, 2012
- 卷：324
- 期：14
- 页码：2310-2314
- 文件大小：1094 K
摘要
The high-temperature oxidation resistance and magnetic properties of Si-doped Sm<sub>2sub>Co<sub>17sub>-type magnets at 500 掳C were systematically investigated. The Sm(Co<sub>0.76sub>, Fe<sub>0.1sub>, Cu<sub>0.1sub>, Zr<sub>0.04sub>)<sub>7sub>Si<sub>xsub> (x=0-0.6) magnets were prepared by the conventional powder metallurgical technique. It is found that the addition of silicon in the Sm<sub>2sub>Co<sub>17sub>-type magnet can remarkably improve its oxidation resistance. Moreover, a small amount of silicon addition can also increase its high-temperature intrinsic coercivity. A maximum intrinsic coercivity of 6.7 kOe at 500 掳C was obtained for the Sm<sub>2sub>Co<sub>17sub>-type magnet with Si content x=0.4, whose high-temperature maximum energy product loss was about 2.5 times smaller than pure Sm<sub>2sub>Co<sub>17sub>-type magnet after oxidation at 500 掳C for 100 h, indicating the enhanced oxidation resistance. Its corresponding Curie temperature and saturation magnetization are about 723.9 掳C and 7.4 kG, respectively.