| 简介 |
PURPOSE : An R-Fe-B based rare earth permanent magnet having a low eddy current and a high coercive force suitably for permanent magnet rotary machines, wherein R is at least one element selected from rare earth elements including Y and Sc, a method for making the magnet, and a permanent magnet rotary machine using the magnet are provided.
CONSTITUTION : In a method for making a rare earth permanent magnet from a sintered magnet body having a R^1-Fe-B based composition, wherein R^1 is at least one element selected from rare earth elements including Y and Sc, the method comprises : forming a plurality of slits in at least one surface of the corresponding magnet body; and heat treating the corresponding magnet body and the powder to a sintering temperature of the corresponding magnet body or less in vacuum or in an inert gas in the state that a powder comprising at least one compound selected from an oxide of R^2, a fluoride of R^3, and an oxyfluoride of R^4 is present on a surface of the corresponding magnet body, wherein each R^2, R^3, and R^4 is at least one element selected from rare earth elements including Y and Sc.
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