POWDER COMPOSITION AND METHOD FOR PREPARING R-FE-B-SERIES SINTERED MAGNET

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The present invention provides a powder composition and a method for preparing an R-Fe-B-series sintered magnet. The powder composition consists of a component (A), a component (B), and a component (C). The component (A) is selected from one or more of fluoride powder, oxide powder, and oxyfluoride powder of heavy rare earth. The component (B) is rare earth-transition intermetallic compound powder having a MgCu2 crystal structure. The component (C) is selected from one or more of rare earth hydrated nitrate powder. The method for preparing an R-Fe-B-series sintered magnet provided by the present invention comprises : coating a conditioning fluid containing the powder composition on the magnet, which has the technical effect of using a tiny amount of heavy rare earth dysprosium (Dy) or terbium (Tb) to significantly improve the coercivity of the magnet under the premise of basically keeping remanence and a maximum magnetic energy product of the R-Fe-B-series sintered magnet.