High Temperature Stability of SmTM Magnets
High Temperature Stability of SmTM Magnets
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DOI：
10.1109/intmag.1998.737354
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发表时间：
1998-01
期刊：
影响因子：
--
通讯作者：
A. Kim
中科院分区：
文献类型：
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作者：
A. Kim
为了满足对可在高达450-500 °C下使用的永磁材料的需求，我们研究并报告了具有低矫顽力温度系数和适度高矫顽力的SmTM磁体在高温下的不可逆损耗比传统的Sm 2 TM 17磁体低得多。我们继续研究这些磁体的高温磁行为。随着温度的升高，SmTM 7合金磁体的磁性能，特别是矫顽力的降低比Sm 2 TM 17合金磁体慢得多。因此，SmTM 7的Hci在500 °C下保持大于5 kOe，从而保持其高能量积，而Sm 2 TM 17磁体在相同温度下仅具有约1.7 kOe，并且具有低能量积。SmTM 7合金磁体在500 °C下进行长期稳定性测试，1240小时后的不可逆磁通损失小于5%。这些结果表明，SmTM 7合金磁体可以在高达500 °C的温度下使用很长一段时间。这个Wi…
To meet the demand for permanent magnet materials usable up to 450–500 °C, we investigated and reported that a SmTM magnet with a low temperature coefficient of coercivity and a moderately high coercivity has substantially lower irreversible losses at elevated temperatures than conventional Sm2TM17 magnets. We have continued our studies on the high temperature magnetic behavior of these magnets. The magnetic properties, particularly coercivity, of the SmTM7 alloy magnets are reduced much more slowly than the Sm2TM17 alloy magnets as temperature increases. As a result, the Hci of SmTM7 remains greater than 5 kOe at 500 °C and thus maintains its high-energy product, while the Sm2TM17 magnet has only about 1.7 kOe at the same temperature and has a low energy product. SmTM7 alloy magnets undergoing a long-term stability test at 500 °C exhibit irreversible flux losses of less than 5% after 1240 h. These results indicate that SmTM7 alloy magnets can be usable up to 500 °C for an extended period of time. This wi...