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

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

Several nitrides, including BN, AlN, VN, TiN, NbN, CrN, HfN, TaN, ZrN, and Si/sub 3/N/sub 4/, 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...

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Veröffentlicht in:IEEE transactions on magnetics 1990-09, Vol.26 (5), p.2637-2639
Hauptverfasser: Heh, S.J., Lin, K.D., Jein, Y.M., King, F.D., Lee, F.L., Chin, T.S.
Format: Artikel
Sprache:eng
Schlagworte:
Applied sciences
Boron
Coercive force
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Earth
Exact sciences and technology
Iron alloys
Magnetic properties
Magnetic properties and materials
Magnets
Metals. Metallurgy
Neodymium
Physics
Remanence
Temperature
Tin
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Zusammenfassung:Several nitrides, including BN, AlN, VN, TiN, NbN, CrN, HfN, TaN, ZrN, and Si/sub 3/N/sub 4/, 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 Si/sub 3/N/sub 4/ 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.< >
ISSN:0018-9464
1941-0069
DOI:10.1109/20.104823