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Magnetic Properties of α Fe/NdFeB Nanocomposite Alloys Prepared by Two-Step Rapid Solidification

Published online by Cambridge University Press:  21 February 2011

M. Yamasaki ,
H. Mizuguchi ,
H Morioka ,
M. Hamano  and
A. Inoue
M. Yamasaki
Affiliation:
AMC Div, Toda Kogyo Corp, Hiroshima, 739-0652, JAPAN
H. Mizuguchi
Affiliation:
AMC Div, Toda Kogyo Corp, Hiroshima, 739-0652, JAPAN
H Morioka
Affiliation:
AMC Div, Toda Kogyo Corp, Hiroshima, 739-0652, JAPAN
M. Hamano
Affiliation:
AMC Div, Toda Kogyo Corp, Hiroshima, 739-0652, JAPAN
A. Inoue
Affiliation:
Inst. for Materials Research, Tohoku Univ., Sendai, 980-8577, JAPAN
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Abstract

In order to obtain directly powders of nanocomposite a Fe/NdFeB alloys with the composition of NdxFebaICO8NbyB, where x: 8.0-8.5, y: 1.5-2.5, z: 6.0-6.5 in at%, have been prepared using the two-step rapid solidification apparatus, which is composed of a gas atomizing system at the upper side and a collision-and-solidificating rotor system at the lower side. It is found that the coercivity (HcJ) of flat-shaped powders obtained depends on powder sizes. The best HcJ in each sieved powder is 525 kA/m (6.60 kOe) for a size more than 500 p m, 449 kA/m (5.64 kOe) for 150-500 pm, and 391 kA/m (4.91 kOe) for 50-150 p m. These values are not so high compared to those of powders of ribbons prepared using a single-roller melt spinning apparatus. This should be attributed to the powder size distribution that causes fluctuation of the quenching rate. Thickness of the flat powder is found to be controllable up to 70/g m, which is useful to get compression molded bonded magnets with a high density and thus a high remanence (Br). An epoxy-bonded magnet with (BH)max: 61.8 kJ/m 3 (7.76 MGOe), Br: 0.732 T (7.32 kG), HcJ: 427 kA/m (5.36 kOe), and density of 6.20 Mg/m 3 is obtained.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 577: Symposium H – Advanced Hard and Soft Magnetic Materials , 1999 , 235
Copyright
Copyright © Materials Research Society 1999

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References

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