| 摘要 |
PURPOSE:To obtain anisotropic materials with stable high orientability by using a rare earth-Fe-B alloy having columnar crystals in its cast macrotexture, and performing hydrogen occulusion and dehydrogenation processing of this alloy. CONSTITUTION:An alloy composed of 8-30atom.% of one or more kinds of rare earth elements, 3-15atom.% of B, and the rest; Fe, are arc-melted and poured into a casting die. And the casting die is cooled matching its cooling direction upwards from the bottom, and an alloy cast is manufactured so as to have more than 50vol.% of columnar crystals in its cast macrotexture. Following this, homogenization processing of this alloy cast is performed in an Ar atmosphere. After that, it is heated to a temperature in a range of 500-1,000 deg.C in a hydrogen gas atmosphere to occlude hydrogen. Following this, holding it at the same temperature in a vacuum atmosphere dehydrogenation is performed, and quenching is performed after that. Consequently, it becomes possible to orient crystals stably and obtain rare earth magnet materials having high coercive force and high magnetic anisotropy. |
