Patent ID: 6676773
Filing Date: 2004-01-13
Classification: B22F,C22C,H01F

Abstract:
An alloy powder for an Râ€”Feâ€”B-type rare earth magnet, the powder comprising a pulverized material alloy that is to be used to form The Râ€”Feâ€”B-type rare earth magnet and that includes a chilled structure that constitutes about 2 volume percent to about 20 volume percent of the material alloy;wherein the powder has a volume particle size distribution with a single peak and a mean particle size (FSSS particle size) of about 4 &mgr;m or less; and wherein in the volume particle size distribution, a total volume of particles that have particle sizes falling within a first particle size range is greater than a total volume of particles that have particle sizes falling within a second particle size range, where the first particle size range is defined by a particle size A representing the peak of the volume particle size distribution and a predetermined particle size B that is smaller than the particle size A, the second particle size range is defined by the particle size A and another predetermined particle size C that is larger than the particle size A, and the particle size C minus the particle size A is equal to the particle size A minus the particle size B.