稀土永久磁铁材料及其制造方法

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A method for preparing a rare earth permanent magnet material comprising the steps of : disposing a powder comprising one or more members selected from an oxide of R2 , a fluoride of R3 , and an oxyfluoride of R4 wherein R2 , R3 and R4 each are one or more elements selected from among rare earth elements inclusive of Y and Sc on a sintered magnet form of a R1 -Fe-B composition wherein R1 is one or more elements selected from among rare earth elements inclusive of Y and Sc, and heat treating the magnet form and the powder at a temperature equal to or below the sintering temperature of the magnet in vacuum or in an inert gas. The invention offers a high performance, compact or thin permanent magnet having a high remanence and coercivity at a high productivity.