Sintered Sm2Co17-Based Magnets With Small Additions of Indium

被引:6
|
作者
Gabay, Alexander M. [1 ]
Marinescu, Melania [2 ]
Liu, JinFang [2 ]
Hadjipanayis, George C. [1 ]
机构
[1] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA
[2] Elect Energy Corp, Landisville, PA 17538 USA
关键词
Coercive force; indium; permanent magnets; samarium alloys;
D O I
10.1109/TMAG.2008.2001540
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In an attempt to develop anisotropic high-temperature permanent magnets consisting Of Sm-2 (Co,Fe)(17) grains separated by thin layers of a nonmagnetic phase, small amounts of Ag, C, Ga, In, and Sri were added to the Sm2Co17-based alloys and sintered magnets. Grain-boundary phase(s) with the melting temperature of 985-1070 degrees C was obtained by adding 0.5-1.5 at. % In to Sm-Co, Sm-Co-Fe, and Sm-Co-Mn alloys with the Sin content slightly enriched compared to the 2 : 17 stoichiometry. Iron, manganese and, apparently, oxygen tend to decrease the melting temperature of the grain-boundary phase(s). Due to this low-melting-temperature phase, sintering of the milled Sm2Co17-based alloys becomes possible at temperatures as low as 1025-1075 degrees C. This phase is also believed to be responsible for the coercivity of 6-8 kOe observed in the Sm-Co-Fe-Mn-In alloys. The coercivity was found to be critically sensitive to the postsintering heat treatment: it dramatically deteriorates when the magnets are annealed below the melting temperature of the grain boundary phase(s).
引用
收藏
页码:4218 / 4221
页数:4
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