Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 370, Issue -, Pages 76-80Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2014.06.051
Keywords
Permanent magnet; Magnetic property; Microstructure
Funding
- National Natural Science Foundation of China [NSFC-51171169]
- Key Innovative Team for Magnetic Materials of Zhejiang Province
- Zhejiang Provincial Key Lab of Novel Materials for Information Technology
- Project of Nonprofit Technology & Research of Zhejiang Province [2013C31025]
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To enhance coercivity and reduce the rare-earth consumption of Nd-Fe-B sinterecl magnets simultaneously, low melting point Dy69Ni31 (at%) powders are introduced into a slightly off-stoichiometric Nd2Fe14B (2:14:1 phase) (Pr, Nd)(12.36)FebalB6.09 (at%) starting magnet. Because of insufficient rare-earth element, the starting magnet possesses discontinuous intergranular grain boundaries (GBs) that cannot decouple the 2:14:1 phase grains well, hence leading to a low coercivity of only 9.53 kOe. The Dy69Ni31 additive provides extra rare-earth that improves the liquid phase sintering with the formation of continuous intergranular GBs, accompanied by the diffusion of Dy towards surface region of the 2:14:1 phase grains. A significant increment in coercivity of 6.25 kOe is realized with a slight reduction in remanence by -3.0% per unit at% Dy. Satisfactory magnetic performance with (BH)(max)=47.49 MGOe, B-r=13.92 kGs and H-cj=13.93 kOe, is obtained in the magnet containing only 12.92 at% rare-earth elements, in which 0.68 at% Dy is included. It combines advantages of the modification of intergranular GBs and the formation of a magnetically hardening shell surrounding 2:14:1 phase grains, which can be a promising approach to fabricate low rare-earth and high performance Nd-Fe-B magnets for mass production. (C) 2014 Elsevier B.V. All rights reserved.
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