METHOD FOR MANUFACTURING R-T-B BASED PERMANENT MAGNET

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PROBLEM TO BE SOLVED : To improve a coercive force of HDDR (hydrogenation-disproportionation-desorption-recombination) magnetic powder by supplying an element not including Ga, Dy and Tb from the outside of the HDDR magnetic powder. SOLUTION : The method for manufacturing an R-T-B based permanent magnet includes a step for preparing R-T-B based permanent magnetic powder produced by HDDR treatment and containing >29 and ≤40 mass% of a rare earth amount and ≥0.3 and ≤2 mass% of a B amount in a composition, a step for preparing Zn-containing powder as a metal or an alloy containing at least ≥30 mass% of Zn and not containing Ga, Dy and Tb, a step for mixing the anisotropic R-T-B based alloy powder and the Zn-containing powder so that the Zn is ≥0.05 and ≤1.5 mass% in the total content to produce mixed powder, and a step for applying diffusion heat treatment to the mixed powder in a vacuum or an inert gas atmosphere with a temperature of 450°C or higher but lower than 900°C. COPYRIGHT : (C)2011, JPO&INPIT