DocumentCode
867279
Title
Coercivity enhancement of boron nitride doped Nd15Fe77B8 permanent magnets
Author
Chen, S.K. ; Chin, T.S. ; Heh, S.J. ; Lin, K.D.
Author_Institution
Dept. of Mater. Sci & Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan
Volume
26
Issue
5
fYear
1990
fDate
9/1/1990 12:00:00 AM
Firstpage
2634
Lastpage
2636
Abstract
It is demonstrated that a small addition of boron nitride is effective in increasing the iH c value of Nd-Fe-B magnets. With the optimal addition of 0.1 wt.% BN, a maximum 20% increase in iH c and a slight increase in B r are obtained; hence, (BH )m is slightly enhanced. Chemical compositions estimated by Auger spectroscopy and EPMA (electron probe microanalysis) indicate that the boron concentration is higher at grain boundaries. The higher concentration of boron may be due to the fact that BN particles react with Nd and dissolve in the Nd-rich phase during heating processes. Although the dissolved BN contributes to slight grain refining, the coercivity mechanism might be attributed to the change in composition, notably an increase of NdN and NdB6, and morphology of the intergranular phase
Keywords
boron alloys; boron compounds; coercive force; ferromagnetic properties of substances; iron alloys; neodymium alloys; permanent magnets; Auger spectroscopy; BN; EPMA; Nd-rich phase; Nd15Fe77B8; coercivity mechanism; composition; electron probe microanalysis; grain boundaries; grain refining; heating processes; intergranular phase; morphology; permanent magnets; Boron; Chemicals; Coercive force; Electrons; Grain boundaries; Heating; Magnets; Neodymium; Probes; Spectroscopy;
fLanguage
English
Journal_Title
Magnetics, IEEE Transactions on
Publisher
ieee
ISSN
0018-9464
Type
jour
DOI
10.1109/20.104822
Filename
104822
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