METHOD FOR INCREASING COERCIVE FORCE OF MAGNETS

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The present invention provides a method for improving coercive force of magnets, this method comprises steps as follows : S2) coating step : coating a coating material on the surface of a magnet and drying it; and S3) infiltrating step : heat treating the magnet obtained from the coating step S2). The coating material comprises (1) metal calcium particles and (2) particles of a material containing a rare earth element; the rare earth element is at least one selected from Praseodymium, Neodymium, Gadolinium, Terbium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium and Lutetium. The method of the present invention can significantly increase coercive force of a permanent magnet material, while remanence and magnetic energy product hardly decrease. In addition, the method of the present invention can significantly decrease the amount of a rare earth element, and accordingly, decrease the production cost.