High-temperature oxidation resistance and magnetic properties of Si-doped Sm2Co17-type magnets at 500 °C
High-temperature oxidation resistance and magnetic properties of Si-doped Sm2Co17-type magnets at 500 °C
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DOI：
10.1016/j.jmmm.2012.02.122
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发表时间：
2012-07-01
影响因子：
2.7
通讯作者：
Jiang, Chengbao
中科院分区：
文献类型：
--
作者：
Liu, Lili;Jin, Tingyan;Jiang, Chengbao
系统研究了Si掺杂Sm 2Co 17型永磁体的高温抗氧化性能和500 ℃下的磁性能。采用常规粉末冶金工艺制备了Sm（Co-0.76，Fe-0.1，Cu-0.1，Zr-0.04）（7）Si-x（x=0 ~ 0.6）永磁体。结果表明，在Sm 2Co 17型永磁体中添加硅元素可以显著提高其抗氧化性能。此外，少量硅的添加也可以提高其高温本征介电常数。Si含量x=0.4的Sm 2Co 17型磁体在500 ℃下获得了6.7 kOe的最大本征矫顽力，在500 ℃下氧化100 h后，其高温最大能量积损失比纯Sm 2Co 17型磁体小约2.5倍，表明抗氧化性增强。其相应的居里温度和饱和磁化强度分别约为723.9 ℃和7.4 kG。(C)2012爱思唯尔有限公司版权所有。
The high-temperature oxidation resistance and magnetic properties of Si-doped Sm2Co17-type magnets at 500 degrees C were systematically investigated. The Sm(Co-0.76, Fe-0.1, Cu-0.1, Zr-0.04)(7)Si-x (x=0-0.6) magnets were prepared by the conventional powder metallurgical technique. It is found that the addition of silicon in the Sm2Co17-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 degrees C was obtained for the Sm2Co17-type magnet with Si content x=0.4, whose high-temperature maximum energy product loss was about 2.5 times smaller than pure Sm2Co17-type magnet after oxidation at 500 degrees C for 100 h, indicating the enhanced oxidation resistance. Its corresponding Curie temperature and saturation magnetization are about 723.9 degrees C and 7.4 kG, respectively. (C) 2012 Elsevier B.V. All rights reserved.