Method for enhancing magnetic properties of rare earth permanent

Details Method for enhancing magnetic properties of rare earth permanent Method for enhancing magnetic properties of rare earth permanent

1989-10-02

1990-06-12

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148105, 419 62, 419 63, 419 64, 419 65, 209173, H01F 102

Patent

active

049330250

ABSTRACT:
A method for treating rare earth permanent magnetic material is disclosed. The treatment includes soaking ribbon rare earth permanent magnetic material consisting essentially of grains of the tetragonal crystal phase RE.sub.2 TM.sub.14 B where RE is neodymium and/or praseodymium or mixtures thereof with other rare earth elements and TM is iron or mixtures of iron and cobalt, cobalt in a soaking solution of either distilled water or phosphoric acid and manganese phosphate solution, draining off the soaking solution, rinsing with distilled water while agitating to separate and remove fine powdered magnetic material, and washing and drying the remaining powder or ribbons. The treated material is taken to substantial dryness before the material is incorporated into a permanent magnet.

REFERENCES:
patent: 4496395 (1985-01-01), Croat
patent: 4792367 (1988-12-01), Lee
patent: 4802931 (1989-02-01), Croat

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