- Volume 2 Issue 3
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.
- J. Appl. Phys. v.55 no.6 M. Sagawa;S. Fujimura;N. Togawa;H. Yamamoto;Y. Matsuura
- J. Appl. Phys. v.55 no.6 J. J. Croat;J. F. Herbst;R. W. Lee;F. E. Pinkerton
- Appl. Phys. Lett. v.46 no.8 R. W. Lee
- J. Appl. Phys. v.67 no.9 Lin Li;C. D. Graham, Jr.
- J. Appl. Phys. v.62 Raja K. Mishra
- United States Patent No. 5, 516, 371 Y. B. Kim;C. S. Kim;T. S. Chung;K. S. An