| 简介 |
PROBLEM TO BE SOLVED : To provide a method for manufacturing a magnet in which heavy rare earth elements RH are efficiently diffused in the inner part of an R-T-B-based sintered magnet, and which obtains predetermined magnetic characteristics.
SOLUTION : The method for manufacturing the R-T-B-based sintered magnet includes the steps of : preparing an R-T-B-based sintered magnet material; preparing a powdery diffusion material formed of an RH-Fe alloy made from a heavy rare earth element RH (RH contains at least one of Dy and Tb) and Fe of 40 mass% or more but 95 mass% or less, and RL metal containing a light rare earth element RL (which contains at least one of Nd, Pr, Ce, and La), and in which a total amount of contained rare earth is 65 mass% or more, the light rare earth element RL is contained 20 mass% or more but 70 mass% or less, and the heavy rare earth element RH is contained 50 mass% or less; and subjecting the R-T-B-based sintered magnet material to RH diffusion treatment at a temperature of 800°C or higher but 1, 000°C or lower in a vacuum or an inert gas in a state that the diffusion material exists on the surface of the R-T-B-based sintered magnet material.
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