High weatherability magnet powder, and a resin composition for a bond magnet bonded magnet using th

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PROBLEM TO BE SOLVED : To provide a highly weather resistant magnet powder having stable and high coercive force and high weather resistance and reduced at its dispersion of coercive force and weather resistance, a resin composition for a bonded magnet and the bonded magnet using the resin composition. SOLUTION : In the highly weather resistant magnet powder constituted of coating the surface of rare earth element-iron-nitrogen (R-T-N) magnet powder having Th2Zn17or Th2Ni17crystal structure with a phosphate (R-T-P-O) film, average grain size is 1-10μm and the composition consists of 20-25 wt% R (rare earth elements), 2.1-3.9 wt% N (nitrogen), 0.2-2.0 wt% P (phosphorus), 0.5-5.0 wt% O (oxygen), and balance T (transition metallic elements and unavoidable impurities) and the content of H (hydrogen) which is an unavoidable impurity is ≤ 0.3wt%. COPYRIGHT : (C)2004, JPO