METHOD OF MANUFACTURING PERMANENT MAGNET

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PROBLEM TO BE SOLVED : To provide a method of manufacturing a permanent magnet which does not generate or hardly generate various types of oxides in a grain boundary phase comprising the permanent magnet with respect to the method of manufacturing the permanent magnet which carries out grain boundary diffusion of a heavy rare-earth element from a surface of the permanent magnet.SOLUTION : The method of manufacturing the permanent magnet includes the steps of : preparing the permanent magnet E which represents a metal structure comprising a main phase S and grain boundary phase R; adhering metal particle for improving coercive force performance of the permanent magnet E to part or whole of a surface of the permanent magnet E so as to form an intermediate; and heat processing the intermediate under an inert gas atmosphere where partial pressure of oxygen is ≤1×10-18atm so as to carry out boundary diffusion thereof.COPYRIGHT : (C)2011, JPO&INPIT