| 摘要 |
PURPOSE:To obtain the temperature characteristics of magnetization which could not be obtained with conventional alloy compositions or through conventional magnetizing method and suppress the flux variation over a wide range by a method wherein a rare-earth permanent magnet is made of an alloy composition expressed by a specific formula. CONSTITUTION:Generally speaking, a rare-earth two-phase separate type magnet is made of rare-earth elements and transition metals including cobalt, but a metal composition expressed by the formula is employed in this method. In this formula, R denotes at leas one of Gd, Tb, Dy, Ho, Er and Ta, M denotes at least one of Ti, Zr, Hf, Nb, Ta and W, and the relation between X, U, V, Y and Z in the formula is set to satisfy 0.2<=X<=0.5, 0.1<=U<=0.3, 0.02<=V<=0.06, 0.03<=Y<=0.05 and 6.5<=Z<=8.0. Further, the alloy composition is ground into fine powder and, after the powder is compression molded into a predetermined shape in a magnetic field, the molded element is sintered, turned into solution and aged under temperatures 1100-1250 deg.C, 1000-1200 deg.C and 400-1000 deg.C respectively. |
