Rare earth magnet and method for producing the magnet

Details Rare earth magnet and method for producing the magnet Rare earth magnet and method for producing the magnet

2006-11-21

2006-11-21

Sheehan, John P. (Department: 1742)

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

C148S302000, C164S463000

Reexamination Certificate

active

07138017

ABSTRACT:
A method of making an alloy powder for an R—Fe—B-type rare earth magnet includes the steps of preparing a material alloy that is to be used for forming the R—Fe—B-type rare earth magnet and that has a chilled structure that constitutes about 2 volume percent to about 20 volume percent of the material alloy, coarsely pulverizing the material alloy for the R—Fe—B-type rare earth magnet by utilizing a hydrogen occlusion phenomenon to obtain a coarsely pulverized powder, finely pulverizing the coarsely pulverized powder and removing at least some of fine powder particles having particle sizes of about 1.0 μm or less from the finely pulverized powder, thereby reducing the volume fraction of the fine powder particles with the particle sizes of about 1.0 μm or less, and covering the surface of remaining ones of the powder particles with a lubricant after the step of removing has been performed.

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