RARE EARTH-TRANSITION METAL-NITROGEN BASED MAGNET FINE POWDER AND BOND MAGNET

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PROBLEM TO BE SOLVED : To provide : rare earth-transition metal-nitrogen based magnet fine powder improved in magnetic properties and also excellent in stability of oxidation resistance by finely pulverizing magnet powder within a particular particle size range thereby forming a solid phosphate coating film on the surface of the resultant powder; and a bond magnet including magnet coarse powder. SOLUTION : Rare earth-transition metal-nitrogen based magnet fine powder comprises 23.0-25.0 mass% of rare earth elements and 3.0-3.6 mass% of N with the balance consisting of substantially transition metal elements. In the rare earth-transition metal-nitrogen based magnet fine powder, an average particle diameter (D50) of 1-2 μm, the percentage of particles having a size of 1 μm or less is 20-48%, and a phosphate coating film including 1 mass% or less of P in terms of the element is formed on a surface thereof. SELECTED DRAWING : None COPYRIGHT : (C)2017, JPO&INPIT