A new method for the preparation of anisotropic Nd-Fe-B-based magnets

Author

Yang, J.P. ; An, K.S. ; Song, C.Y. ; Kwon, M. ; Jeoung, T.S. ; Yang, S.C.

Author_Institution

Res. & Dev. Center, Mando Machinery Corp., Kyongki, South Korea

Volume

33

Issue

5

fYear

1997

fDate

9/1/1997 12:00:00 AM

Firstpage

3820

Lastpage

3822

Abstract

A new hot-forming process has been studied to produce anisotropic Nd-Fe-B-based magnets from melt-spun ribbons. The ribbon fragments were inserted in a Cu tube and hot-deformed together with one-stroke. At a height reduction ratio of 0.44, the melt-spun ribbons were densified into a magnet with a density of 7.14 g/cm³, and showed a (BH) _max of 14.6 MGOe. With further deformation, the magnets were plastically deformed with Cu tubes in the lateral direction, and crystallographic anisotropy was introduced. The magnets with a height reduction ratio of 0.75 exhibited magnetic properties of (BH)_max=32.1 MGOe, B_r=11.7 kG, and _iH_c=10.6 kOe. This process shows the possibility that the conventional hot-pressing and subsequent die-upsetting for anisotropic magnets can be simplified into a one-step process

Keywords

boron alloys; densification; density; ferromagnetic materials; forming processes; hot pressing; iron alloys; magnetic anisotropy; melt spinning; neodymium alloys; permanent magnets; plastic deformation; Cu tube; Nd-Fe-B; anisotropic Nd-Fe-B-based magnets; crystallographic anisotropy; density; die-upsetting; height reduction ratio; hot-deformation; hot-forming process; lateral direction; magnetic properties; melt-spun ribbons; one-step process; one-stroke; plastic deformation; preparation; ribbon fragments; Anisotropic magnetoresistance; Coercive force; Crystallography; Magnetic properties; Magnetization; Magnets; Plastics; Remanence; Solids; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.619582

Filename

619582