Rare earth magnet and method for manufacturing the same

Abstract

The method for manufacturing alloy powder for R—Fe—B type rare earth magnets of the present invention includes a first pulverization step of coarsely pulverizing a material alloy for rare earth magnets and a second pulverization step of finely pulverizing the material alloy. In the first pulverization step, the material alloy is pulverized by a hydrogen pulverization method. In the second pulverization step, easily oxidized super-fine powder (particle size: 1.0 μm or less) is removed to adjust the particle quantity of the super-fine powder to 10% or less of the particle quantity of the entire powder.

What is claimed is:  
     
         1 . Alloy powder for R—Fe—B type rare earth magnets having an average particle size in a range between 2 μm and 10 μm, the particle quantity of fine powder having a particle size of 1.0 μm or less being adjusted to 10% or less of the particle quantity of the entire powder.  
     
     
         2 . The alloy power of  claim 1 , wherein said alloy powder is obtained by cooling a molten material alloy at a cooling rate in a range between 10 2 ° C./sec and 10 4 ° C./sec and pulverizing the resultant alloy.  
     
     
         3 . An R—Fe—B type rare earth magnet produced from the alloy powder for R—Fe—B type rare earth magnets of claims  1  or  2 .