HIGHLY WEATHER RESISTANT MAGNET POWDER, RESIN COMPOSITION FOR BONDED MAGNET AND BONDED MAGNET OBTAINED BY USING THE RESIN COMPOSITION

摘要

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 Th₂Zn₁₇ or Th₂Ni₁₇ crystal 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