Process for manufacturing rare earth-iron-boron permanent magnet

Details Process for manufacturing rare earth-iron-boron permanent magnet Process for manufacturing rare earth-iron-boron permanent magnet

1991-04-23

1993-02-02

Sheehan, John P.

Specialized metallurgical processes, compositions for use therei

Processes

Producing or purifying free metal powder or producing or...

148101, H01F 102

Patent

active

051834944

ABSTRACT:
A process for producing rare earth-iron-boron permanent magnet alloy powders comprising; heating pellets comprising a mixture of rare earth oxides, iron power, ferroboron powder and calcium grandules for reaction/diffusion to obtain a rare earth-iron-boron alloy of uniform composition, crushing the resulting alloy to form a powder and contacting the powder with an aqueous solution of acetic acid containing a non-ionic surfactant and an alkai metal acetate.

REFERENCES:
patent: 4770702 (1988-09-01), Ishigaki et al.
patent: 4806155 (1989-02-01), Camp et al.
patent: 4917724 (1990-04-01), Sharma
patent: 4990307 (1991-02-01), Camp
Japanese Patent 63-310906 with English Language Abstract Dec. 11, 1988.
English Language Abstract of Communist China Patent 8600 769 Sep. 1987.
English Language Abstract of Japanese Patent 63 219548 Sep. 1988.

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