The high squareness Sm-Co magnet having Hcb=10.6 kOe at 150°C
The high squareness Sm-Co magnet having Hcb=10.6 kOe at 150°C
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DOI：
10.1063/1.4976334
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发表时间：
2017-02
期刊：
影响因子：
1.6
通讯作者：
Hiroaki Machida;T. Fujiwara;Risako Kamada;Y. Morimoto;M. Takezawa
中科院分区：
文献类型：
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作者：
Hiroaki Machida;T. Fujiwara;Risako Kamada;Y. Morimoto;M. Takezawa
研究了Sm（Fe，Cu，Zr，Co）7.5磁体的磁性能与磁畴结构的关系。经铸锭均匀化热处理、高温短时烧结和长时间固溶热处理的Sm-Co磁体在20°C时的最大磁能积[BH]m为34.0 MGOe，矫顽力Hcb为11.3 kOe。此外，在150°C下实现了10.6 kOe的Hcb。通过光学显微镜观察，热处理后的铸锭在母相中有明显的1-7相。利用外加磁场的克尔效应显微镜观察磁畴结构。反向磁畴均匀地产生，但没有观察到它们从晶粒内部产生。通过扫描透射电子显微镜观察细胞结构，并通过能量色散X射线光谱进行成分分析。该方法操作简便、快速、准确，适用于工业生产。
The relationship between magnetic properties and magnetic domain structures of Sm(Fe, Cu, Zr, Co)7.5 magnet was investigated. The developed Sm-Co magnet, which is conducted homogenization heat treatment at ingot state, high temperature short time sintering and long time solid solution heat treatment showed the maximum energy product, [BH]m of 34.0 MGOe and the coercivity, Hcb of 11.3 kOe at 20°C respectively. Moreover, Hcb of 10.6 kOe at 150°C was achieved. Heat treated ingot has clear 1-7 phase in mother phase from optical microscope observation. Kerr effect microscope with magnetic field applied was used to investigate magnetic domain structure. Reverse magnetic domains were generated evenly but generation of them from inside grain were not observed. Cell structure was observed by scanning transmission electron microscope and composition analysis was conducted by energy dispersive X-ray spectroscopy. Cell size was approximately 150 ∼ 300 nm, Fe and Cu were clearly separated and concentrated to 2-17 phas...