Title :
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
fDate :
9/1/1997 12:00:00 AM
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, Br=11.7 kG, and iHc=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;
Journal_Title :
Magnetics, IEEE Transactions on
