| 摘要 |
PURPOSE:To obtain a composite and integral oxide permanent magnet consisting of parts different in magnetic properties from each other, by specifying the sintering density difference between the sintered part of the magnet having a high coercive force and the sintered part thereof having a high residual magnetic flux density. CONSTITUTION:In a composite and integral sintered magnet including at least two kinds of parts different in magnetic properties from each other, the sintering density difference between the sintered part havig a high coercive force and the sintered part having a high residual magnetic flux density is selected to be not larger than 0.5g/cc. The selection of the sintering density difference to be not larger than 0.5g/cc, preferably about 0.3g/cc, makes it possible to obtain a balance of properties between the high-coercive force side and the high residual magnetic flux density side. On the other hand, a sintering density difference in excess of 0.5g/cc increases the divergence between the properties to lower the magnetic properties. |
