Method for preparing rare earth permanent magnet material

Details Method for preparing rare earth permanent magnet material Method for preparing rare earth permanent magnet material

2007-03-28

2011-12-13

Sheehan, John (Department: 1736)

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

C148S101000, C148S302000

Reexamination Certificate

active

08075707

ABSTRACT:
A method for preparing a rare earth permanent magnet material comprises the steps of disposing a powder on a surface of a sintered magnet body of R1aTbAcMdcomposition wherein R1is a rare earth element inclusive of Sc and Y, T is Fe and/or Co, A is boron (B) and/or carbon (C), M is Al, Cu, Zn, In, Si, P, S, Ti, V, Cr, Mn, Ni, Ga, Ge, Zr, Nb, Mo, Pd, Ag, Cd, Sn, Sb, Hf, Ta, or W, said powder comprising an oxide of R2, a fluoride of R3or an oxyfluoride of R4wherein R2, R3, and R4are rare earth elements inclusive of Sc and Y and having an average particle size equal to or less than 100 μm, heat treating the magnet body and the powder at a temperature equal to or below the sintering temperature of the magnet body for absorption treatment for causing R2, R3, and R4in the powder to be absorbed in the magnet body, and repeating the absorption treatment at least two times. According to the invention, a rare earth permanent magnet material can be prepared as an R—Fe—B sintered magnet with high performance and a minimized amount of Tb or Dy used.

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