Effect of very small additions on the coercivity of Dy-free Nd-Fe-(Co)-B-sintered magnets

被引：29
作者：
Gabay, AM [1 ]
Zhang, Y [1 ]
Hadjipanayis, GC [1 ]
机构：
[1] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2002年 / 238卷 / 2-3期
关键词：
permanent magnets; Nd-Fe-B; powder blending technique; sintering; Nd-rich phase; coercivity;
D O I：
10.1016/S0304-8853(01)00917-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of small substitutions on the coercivity of Nd-Fe-B and Nd-Fe-Co-B-sintered magnets has been investigated. Addition of 0.18 at% Ga was found to be the most effective for improving the coercivity in both Nd-Fe-B and Nd-Fe-Co-B without decreasing much the remanent magnetization, Scanning electron microscopy on Ga-free and Ga-added magnets did not reveal a noticeable difference in phase morphology. However, Fe and especially Co concentrations in the intergranular Nd-rich phase were found to be markedly increased after the small Ga addition. Combined addition of Co with a small amount of Cu did not increase the coercivity of the Dy-free magnets, However, none of the examined very small additives can yet be considered as an alternative to Dy for extending operating temperature range of the high-energy Nd-Fe-B magnets. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：226 / 232
页数：7
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