Effects of nitride additions on the magnetic properties of R -Fe-B magnets (R=rare earths)

Author

Heh, S.J. ; Lin, K.D. ; Jein, Y.M. ; King, F.D. ; Lee, F.L. ; Chin, T.S.

Author_Institution

High End Metals Corp., Hsinchu, Taiwan

Volume

26

Issue

5

fYear

1990

fDate

9/1/1990 12:00:00 AM

Firstpage

2637

Lastpage

2639

Abstract

Several nitrides, including BN, AlN, VN, TiN, NbN, CrN, HfN, TaN, ZrN, and Si₃N₄, were doped into R-(Fe, M)-B magnets (R=rare earths, M=Al/Co). Coercivities were enhanced by 6 to 20% with small additions of 0.1 to 0.2 wt.%. Remanence, maximum energy product, and temperature coefficients were all improved. BN, AlN, TiN, and Si₃N₄ were found to be the most effective in the enhancement. It was found that an increase in sintered density and a modification in intergranular phase due to the reaction between nitrides and the Nd-rich phase are the main causes for the improvements

Keywords

boron alloys; coercive force; ferromagnetic properties of substances; iron alloys; permanent magnets; rare earth alloys; remanence; AlN; BN; CrN; HfN; NbN; Si₃N₄; TaN; TiN; VN; ZrN; coercivities; intergranular phase; magnetic properties; maximum energy product; nitride additions; permanent magnets; remanence; sintered density; temperature coefficients; Boron; Coercive force; Earth; Iron alloys; Magnetic properties; Magnets; Neodymium; Remanence; Temperature; Tin;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.104823

Filename

104823