Title :
Enhancement of coercivity in high remanence HDDR Nd-Fe-B powders
Author :
Nakamura, H. ; Kato, K. ; Book, D. ; Sugimoto, S. ; Okada, M. ; Homma, M.
Author_Institution :
Dept. of Mater. Sci., Tohoku Univ., Sendai, Japan
fDate :
9/1/1999 12:00:00 AM
Abstract :
A new type of HDDR (Hydrogenation, Disproportionation, Desorption, Recombination) processing route, in which alloys are heated up under a low pressure of H2 for the disproportionation stage, was found to be an effective way of obtaining high remanence Nd-Fe-B ternary powders, with no large decrease in coercivity (which was the problem with the previous HDDR processing route, in which the alloys were heated under vacuum), The alloys with 0.5% Ga addition exhibited high coercivities of 1.0 MAm-1 with no degradation in remanence (Br=1.4 T),
Keywords :
boron alloys; coercive force; heat treatment; iron alloys; materials preparation; neodymium alloys; permanent magnets; powders; remanence; Ga addition effects; Nd-Fe-B; Nd-Fe-B-Ga; coercivity enhancement; high remanence HDDR powders; hydrogenation/disproportionation/desorption/recombination processing; Anisotropic magnetoresistance; Coercive force; Degradation; Heat engines; Heat treatment; Hydrogen; Magnetic properties; Powders; Pulse measurements; Remanence;
Journal_Title :
Magnetics, IEEE Transactions on
