Rare earth-transition metal-based magnet powder agglomeration is suppressed and its manufacturing me

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PROBLEM TO BE SOLVED : To provide rare-earth/transition-metal/nitrogen-based magnet powder in which agglomeration is suppressed and magnetic properties are improved by subjecting magnet powder to surface treatment using specific reactive organopolysiloxane and also to provide its manufacturing method. SOLUTION : In the rare-earth/transition-metal/nitrogen-based magnet powder with suppressed agglomeration, the surface of the rare-earth/transition-metal/nitrogen-based magnet powder having a particle-size distribution of 1 to 5μm average particle diameter (D50) and ≤5μm (D20-D70 width) is substantially coated with the reactive organopolysiloxane represented by general formula (1). COPYRIGHT : (C)2004, JPO