| 摘要 |
PURPOSE:To provide a title magnet having a maximum energy product (BH)max of 42MGOe or more and a coercive force iHc of 12KOe or more. CONSTITUTION:An in-field press-molded compact of a powder obtained from an ingot of the composition of Nda-Dyb-B1.05-V0.58-Gac-Feba1(wt.%) is sintered at 1080 deg.C X 3hr sintering under vacuum and heat-treated at 900 deg.C X 2hr, 530 deg.C X2hr, so that a sinter of 7.55-7.58g/cc density, 1100-4100ppm oxygen content is obtained. An examination result of the relation Nd content between magnetic characteristics with Dy=l.0wt.%, Ga:0.06wt% with regard to that sinter shows that coercive force iHc increases with an increase in Nd content, but residual flux density Br decreases, and that lowering Dy + Nd content down to 32wt.% or less by complex addition of Nd, Dy, Ga can provide an excellent maximum energy product (BH)max and coercive force. |
