HIGH WEATHER RESISTANCE MAGNETIC POWDER AND RESIN COMPOSITION FOR BOND MAGNET, AND BOND MAGNET OBTA

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PROBLEM TO BE SOLVED : To provide high weather resistance performance magnetic powder which is excellent in weather resistance with high coercive force stably, and has reduced variation of the coercive force or the weather resistance, resin composition for bond magnet, and the bond magnet obtained using it. SOLUTION : The high weather resistance magnetic powder, in which a front surface of rare earth-iron-nitrogen (R-T-N) based Th2Zn17 type or Th2Ni17 type crystal structure is covered with phosphate (R-T-P-O) coat has mean particle diameter of 1-10 μm, contains 20-25 mass% of R (rare earth element), 2.1-3.9 mass% of N (nitrogen), 0.2-2.0 mass% of P (phosphorus), 0.5-5.0 mass% of O (oxygen), and remaining portion of T (transition metallic element and inevitable impurity), and a content of H (hydrogen) being the inevitable impurity is set to be ≤0.3 mass%. COPYRIGHT : (C)2008, JPO&INPIT