Chemical stability and microstructure of Nd-Fe-B magnet prepared by spark plasma sintering

被引：47

作者：

Yue, M ^{[1
]}

Zhang, JX ^{[1
]}

Liu, WQ ^{[1
]}

Wang, GP ^{[1
]}

机构：

[1] Beijing Univ Technol, Minist Educ, Key Lab Adv Funct Mat Sci & Engn, Beijing 100022, Peoples R China

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2004年 / 271卷 / 2-3期

关键词：

corrosion resistance; microstructure; spark plasma sintering; Nd2Fe14B; Nd-rich phase;

D O I：

10.1016/j.jmmm.2003.10.002

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The corrosion resistance and microstructure of anisotropic Nd-Fe-B magnet prepared by spark plasma sintering (SPS) technique were studied. The SPS Nd-Fe-B has displayed more positive corrosion potential E-corr and lower corrosion current density I-corr, than those of the conventional sintered Nd-Fe-B with the same composition in several electrolytes, indicating better anti-corrosion properties. It also shows good stability in an oxidized atmosphere. The microstructure of SPS Nd-Fe-B magnet indicates that the grain size of Nd2Fe14B is fine (about 6 mum) and uniform, and the Nd-rich phase does not form along the grain boundaries of Nd2Fe14B, but agglomerates into the triple junctions. Therefore, the pathways for corrosion propagation are restricted and the inter-granular corrosion process through Nd-rich phase in the magnet is suppressed effectively. As a result, the SPS Nd-Fe-B magnet possesses excellent corrosion resistance. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：364 / 368

页数：5

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