期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 323, 期 1, 页码 115-121出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2010.08.043
关键词
Coercivity; Hydrogenation-disproportionation-desorption-recombination; Nd-Fe-B; Permanent magnet; Densification; Nd-rich phase; Grain boundary
资金
- MEXT
- World Premier International Research Center Initiative (WPI Initiative) on Materials Nanoarchitronics, MEXT, Japan
High coercivity, fully dense anisotropic permanent magnets of submicron grain sizes were produced by rapid hot-press consolidation of hydrogenation-disproportionation-desorption-recombination (HDDR) processed Nd-Fe-Co-B powders. In the hot-press process, the coercivity of the consolidated material showed a sharp minimum prior to full densification. Thereafter, it reached a value 25% higher than that of the initial powder. Scanning electron microscopy and transmission electron microscopy observations revealed that the variation in H-cJ was caused by are distribution of Nd along the grain boundaries during hot pressing and that the high coercivity was attributable to the formation of thin, continuous Nd-rich phase along the grain boundaries. (C) 2010 Elsevier B.V. All rights reserved.
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