| 摘要 |
PROBLEM TO BE SOLVED: To stably provide a rare earth bonde magnet having magnetic characteristics of maximum enery product (BH) max >=11.0MGOe. SOLUTION: In a rare earth metal bonded magnet manufacturing, R-Fe-B based alloy (R is one kind or more kinds out of Nd, Sm, Pr, La and Ce) powder is mixed with organic binder, and molded and hardened, and then the surface is coated. In this case, the density after molding and hardening is adjusted to be higher than or equal to 6.29g/cm<3> , the surface is coated with coating material capable of hardening at 140 deg.C or lower, and the coated film is hardened at 140 deg.C or lower. The hardening of a molded object is performed by heating in an inert gas atmosphere. |
