| 摘要 |
PURPOSE:To improve the degree of orientation of a molded body in manufacturing a rare-earth sintered magnet by applying a pulse magnetic field to a green compact of magnetic powder when the green compact is in a predetermined density range. CONSTITUTION:Magnetic powder containing R (at least one type of rare-earth elements which include Y) and transition elements is subjected to a dry molding. In this event, when a relative density of a green compact of the magnetic powder is in a range of 25-55%, a pulse magnetic field is applied to the compact at least three times. Thereby, a molded body having a considerably high degree of orientation is obtained, and hence it is possible to obtain a sintered magnet of good magnetization having a considerably high residual magnetic flux density. Moreover, it is possible to improve a mechanical strength of the molded body. |
