Rare earth permanent magnet and its preparation

Details Rare earth permanent magnet and its preparation Rare earth permanent magnet and its preparation

2011-07-26

2011-07-26

Sheehan, John P (Department: 1736)

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

C148S101000, C148S103000, C148S302000

Reexamination Certificate

active

07985303

ABSTRACT:
A rare earth permanent magnet is prepared by disposing a powdered metal alloy containing at least 70 vol % of an intermetallic compound phase on a sintered body of R—Fe—B system, and heating the sintered body having the powder disposed on its surface below the sintering temperature of the sintered body in vacuum or in an inert gas for diffusion treatment. The advantages include efficient productivity, excellent magnetic performance, a minimal or zero amount of Tb or Dy used, an increased coercive force, and a minimized decline of remanence.

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