Preparation of Rare Earth Permanent Magnet Material

摘要

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.