METHOD OF MANUFACTURING RARE-EARTH SINTERED MAGNET, AND THE RARE-EARTH SINTERED MAGNET

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PROBLEM TO BE SOLVED : To provide a method of manufacturing a rare-earth sintered magnet which improves the grindability and the magnetic characteristics, and to provide a rare-earth sintered magnet. SOLUTION : A method of manufacturing a rare-earth sintered magnet, when a rare-earth sintered magnet having a main phase containing R2T14B (R represents one or more kinds of rare-earth element is manufactured, T represents one or more kinds of transition metal element containing Fe or Fe and Co, and B represents B or B and C) compound and a grain boundary phase containing lots of R; obtains the rare-earth sintered magnet by mixing an alloy powder of a first alloy containing R2T14B compound and an alloy powder of a second alloy containing HR2T14B compound (HR represents one or more kinds of a heavy rare-earth element), where a containing amount of HR is 25.0 mass% or more and 32.5 mass% or less, and a containing amount of B is 0.6 mass% or more and 1.4 mass% or less; and sinters the mixture. The rare-earth sintered magnet has a composition that R is 25.0 mass% or more and is less than 32.5 mass%, and B is 0.5 mass% or more and 1.5 mass% or less. COPYRIGHT : (C)2012, JPO&INPIT