| 简介 |
PROBLEM TO BE SOLVED : To provide a production method for an R-T-B-based rear earth sintered magnetic alloy capable of providing an R-T-B-based magnet having high coercive force even when the B concentration in the magnet is low and the Dy concentration is zero or very low.
SOLUTION : The production method for an R-T-B-based rare earth sintered magnetic alloy is provided that comprises : a casting step of producing a cast alloy by casting an alloy molten metal which is composed of a rare earth element R, a transition metal T essentially containing Fe, a metal element M, and B with inevitable impurities, the R being contained in an amount of 13 to 15.5 atom%, the B being contained in an amount of 5.0 to 6.0 atom%, the M being contained in an amount of 0.1 to 2.4 atom% and the balance being T, and a ratio of Dy in the all rare earth element being 0 to 65 atom% and the alloy molten metal satisfying the following (Formula 1); a hydrogen storage step of causing the cast alloy to store hydrogen; and a dehydrogenation step of releasing hydrogen from the cast alloy in which hydrogen has been stored. The dehydrogenation step is conducted at a temperature of less than 550°C in inert gas atmosphere. 0.32≤B/TRE≤0.40.. (Formula I).
SELECTED DRAWING : Figure 3
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