MANUFACTURING METHOD OF RARE-EARTH PERMANENT MAGNET

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PROBLEM TO BE SOLVED : To enable to manufacture a rare-earth permanent magnet excellent in magnetic characteristics such as residual magnetic flux density by improving the orientation degree of a rare-earth alloy powder. SOLUTION : A finely pulverized rare-earth alloy powder is molded in a magnetic field, and sintered. Prior to the magnetic molding in the magnetic field, the finely pulverized rare-earth alloy powder is subjected to heat treatment. The heat treatment temperature is preferably 600-900°C. After the heat treatment, a lubricant is after-added. After the heat treatment, the rare-earth alloy powder may be re-pulverized. Before the heat treatment, the powder may be magnetized or degreased (lubricant removal) in advance. COPYRIGHT : (C)2008, JPO&INPIT