METHOD FOR MANUFACTURING RARE EARTH ALLOY, ALLOY LUMP FOR R-T-B MAGNET, R-T-B MAGNET, R-T-B BONDED MAGNET, ALLOY LUMP FOR R-T-B EXCHANGEABLE SPRING MAGNET, R-T-B EXCHANGEABLE SPRING MAGNET AND R-T-B EXCHANGEABLE SPRING BONDED MAGNET

摘要

PROBLEM TO BE SOLVED: To provide a method for raising the heat transfer rate of a cast lump from a casting mold surface to the inner wall surface of a casting mold when a rare earth alloy or particularly an alloy for an R-T-B magnet is manufactured by a centrifugal casting method and to thereby manufacture the alloy for the R-T-B magnet having microcrystalline grains which have not heretofore been.

SOLUTION: The method for manufacturing a rare earth alloy by a centrifugal casting method comprises a step of mounting a film having a small thermal conductivity than that of a casting mold material on the inner wall surface of a cylindrical casting mold. The thermal conductivity of the film is 80 W/mK or less.

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