| 摘要 |
PURPOSE:To improve saturation magnetization and coercive force at room temp., by constituting by specifying the ratio of a low rare earth-B-Fe alloy with a specific composition to an alloy prepared by rapidly cooling a molten substance of high rare earth-Fe. CONSTITUTION:An alloy I consisting of, by weight, 20-35% R (Y, rare earth elements), 0.5-1.0% B, and the balance M (Fe, a mixture of Fe and Co) is prepared. On the other hand, an alloy II obtained by subjecting a molten substance consisting of 35-80% R and the balance X (Fe, a mixture of Fe and one or more elements among B, Al, Ti, V, Co, Zr, Nb, and Mo) to rapid cooling is prepared. Subsequently, the alloy I and the alloy II are blended in a ratio of 99.9:0.1-80:20, which is crushed and mixed and then is subjected to compacting and sintering to be formed into a permanent magnet. The alloy II provides a magnet having high saturation magnetization since it functions as a sintering auxiliary and causes reduction in oxygen content. Moreover, the alloy II has a coercive force-increasing effect and, when heavy rare earth elements are selected as the above R, the coercive force-increasing effect can be produced. |
