| 摘要 |
In a rare earth magnet, an added heavy rare earth element R<SUB>H </SUB>such as Dy is effectively used without any waste, so as to effectively improve the coercive force. First, a molten alloy of a material alloy for an R-T-Q rare earth magnet (R is a rare earth element, T is a transition metal element, and Q is at least one element selected from the group consisting of B, C, N, Al, Si, and P), the rare earth element R containing at least one kind of element R<SUB>L </SUB>selected from the group consisting of Nd and Pr and at least one kind of element R<SUB>H </SUB>selected from the group consisting of Dy Tb, and Ho is prepared. The molten alloy is quenched, so as to produce a solidified alloy. Thereafter, a thermal treatment in which the rapidly solidified alloy is held in a temperature range of 400° C. or higher and lower than 800° C. for a period of not shorter than 5 minutes nor longer than 12 hours is performed. By the thermal treatment, the element R<SUB>H </SUB>can be moved from the grain boundary phase to the main phase, so that the coercive force is increased.
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