| 摘要 |
PURPOSE:To obtain a permanent magnet having large residual magnetic flux density and maximum energy product by setting (u), (v), (w) and (z) in the particular relation in a permanent magnet of which composition is expressed by Sm1-xPrx (Co1-u-v-wCuuFevTiw)z. CONSTITUTION:In the composition Sm1-xPrx (Co1-u-v-wCuuFevTiw)z, the relations, 0<x<0.5, 0.03<u<0.2, 0.3<v<0.5, 0.01<w<0.05, 6<z<8.2 are satisfied. The powders of various components are mixed in the specified composition ratio and it is, for example, melted within a vacuum high frequency induction heating furnace and is cooled, thereby forming an alloy. This alloy is smashed into fine particles and it is then used as the starting material. Namely, the specified mold is crammed with such powder and is molded with pressure, for example, under the magnetic field and thereby green compact can be obtained. The green compact thus obtained is sintered under the argon gas ambient and a sintered body is formed. Finally, this sintered body undergoes the aging process. |
