Surface modified method of producing sintered rare earth magnet

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PROBLEM TO BE SOLVED : To provide a method of manufacturing a rare earth based sintered magnet having sufficient corrosion resistance given by oxidation heat treatment even under the environment where humidity fluctuates, and preventing magnetic characteristics from being deteriorated by oxidization heat treatment. SOLUTION : This method of manufacturing the surface-modified rare earth based sintered magnet includes a process to apply heat treatment to a magnet under an atmosphere in which oxygen partial pressure is 1×102-1×105Pa and a water vapor partial pressure is 0.1-1, 000 Pa (however, 1, 000 Pa is excluded) at 200-400°C (however, 400°C is excluded) when the Co substitution amount of Fe in a magnet is less than 1.2 mass% of the whole of the magnet, and at 400-600°C when the Co substitution amount of Fe in the magnet is not less than 1.2 mass% of the whole of the magnet. COPYRIGHT : (C)2011, JPO&INPIT