Method for preparing permanent magnet material, chill roll, perm

Details Method for preparing permanent magnet material, chill roll, perm Method for preparing permanent magnet material, chill roll, perm

1992-05-05

1997-09-09

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

164423, 164463, H01F 1032

Patent

active

056651775

ABSTRACT:
A permanent magnet material is prepared by cooling with a chill roll a molten alloy containing R wherein R is at least one rare earth element inclusive of Y, Fe or Fe and Co, and B. The chill roll has a plurality of circumferentially extending grooves in a circumferential surface, the distance between two adjacent ones of the grooves at least in a region with which the molten alloy comes in contact being 100 to 300 .mu.m average in an arbitrary cross section containing a roll axis. Permanent magnet material of stable performance is obtained since the variation of cooling rate caused by a change in the circumferential speed of the chill roll is small. The variation of cooling rate is small even when it is desired to change the thickness of the magnet by altering the circumferential speed. The equalized groove pitch results in a minimized variation in crystal grain diameter.

REFERENCES:
patent: 4705095 (1987-11-01), Gaspar
patent: 4802931 (1989-02-01), Croat

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