BOND MAGNET AND ITS MANUFACTURING METHOD

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PROBLEM TO BE SOLVED : To provide a bond magnet having a high filling factor of magnetic powder and low deterioration of magnetic characteristics resulting from oxidation, etc. and to provide its manufacturing method. SOLUTION : The bond magnet comprises a super-quenching magnet powder comprising a magnetic alloy containing rare earth elements and a thermoplastic resin, wherein an average particle diameter of the super-quenching magnet powder is 20-100 μm and R of an edge portion is ≥1.5 μm. The method for manufacturing the bond magnet comprises the steps of formulating/kneading the super-quenching magnet powder comprising a magnetic alloy containing rare earth elements and having the average particle diameter of 20-100 μm and R of the edge portion of ≥1.5 μm, and a thermoplastic resin, so that an index n is in a range of 0.2-0.8 and a constant B is in a range of 3, 000-20, 000 to obtain an compound, melting the thermoplastic resin in the compound to obtain a melt compound and molding the melt compound into a predetermined shape by injection molding. COPYRIGHT : (C)2008, JPO&INPIT