| 简介 |
PROBLEM TO BE SOLVED : To provide a method of producing a rare earth permanent magnet where the wear of a pulverizer or the like is suppressed in a process of producing a rare earth permanent magnet, and productive efficiency is high. SOLUTION : In the method of producing an R-Fe-B based rare earth permanent magnet consisting of a sintered compact having a final composition comprising, by weight, 25 to 35% R (R is one or more kinds selected from rare earth elements including Y), 0.5 to 4.5% B, 0.02 to 0.5% of one or two kinds selected from Al and Cu, 0.03 to 0.25% M (M is one or more kinds selected from Zr, Nb and Hf) and ≤4% (exclusive of zero) Co, and the balance substantially Fe, a low R alloy including B and a high R alloy including M are used as starting materials. By using the materials in which B and M are not coexistent in this way, the wear of and damage to a pulverizer in a pulverizing stage and of a forming mold in a forming stage in a magnetic field can be reduced. COPYRIGHT : (C)2004, JPO&NCIPI |
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