| 简介 |
PROBLEM TO BE SOLVED : To effectively obtain high performance magnet fine powder used for a bond magnet of magnet application equipment such as a motor by pulverizing magnet rough powder by jet mill pulverization.
SOLUTION : Thus producing method of the samarium-iron-nitrogen-based magnet fine powder contains, as chief ingredients, at least one kind of rare earth elements taking Sm as an essential element; a transition metal element obtained by substituting at least one kind or more of Co, Ti, V, Cr, Mn, Ni, Cu, Zn, Zr, Hf, Nb, Ta, Mo, W, Ga or Al for iron or its part; and nitrogen. In the method, rough powder of the samarium-iron-nitrogen-based magnet fine powder undergoes jet mill pulverization in a jet mill pulverizing apparatus under conditions of a conveying speed of spraying gas and a pulverization time enough to provide fine powder with average particle diameter of 3 μm or less in a single time using inert gas containing 10 vol% or more of helium as conveying and spraying gas.
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