RARE EARTH-IRON-NITROGEN BASED MAGNET POWDER AND MANUFACTURING METHOD THEREFOR, BOND MAGNET COMPOSI

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PROBLEM TO BE SOLVED : To provide rare earth-transition metal-nitrogen based magnet powder having especially high magnetic properties and excellent in surface stability by mildly crushing the rare earth-transition metal-nitrogen based magnet coarse powder and thereby reducing a ratio of grain size of 1 μm or less and suppressing damages on a surface of the magnet powder, and to provide a manufacturing method therefor at low cost, a bond magnet composition using the same and a bond magnet capable of downsizing and enhancing characteristics of various apparatuses. SOLUTION : A rare earth-iron-nitrogen based magnet powder is obtained by pulverizing magnet coarse powder with ceramic balls having a ball diameter of 1 mm or more and 10 mm or less as a pulverizing medium, where the magnet coarse powder is composed of 23.0 mass% or more and 25.0 mass% or less of rare earth elements, 3.0 mass% or more and 3.6 mass% or less of nitrogen and iron and unavoidable impurities as the remainder and is produced by using a reduction diffusion method. The rare earth-iron-nitrogen based magnet powder and the like are provided, the powder having an average grain size (D50) of over 2.5 μm and less than 4 μm, a ratio of the grain size of 1 μm or less of 10% or less, a ratio of the grain size of 5 μm or less of 70% or more, a ratio of the grain size of 10 μm or less of 95% or more. COPYRIGHT : (C)2016, JPO&INPIT