Coated magnetic powder and a bonded permanent magnet composition

Details Coated magnetic powder and a bonded permanent magnet composition Coated magnetic powder and a bonded permanent magnet composition

1989-05-18

1991-01-08

Sheehan, John P.

Metal treatment

Stock

Magnetic

148302, 75230, 75244, 252 6253, 252 6254, 428404, 428405, 427127, H01F 104

Patent

active

049832310

ABSTRACT:
There is provided a surface-treated magnetic powder that can form a resin-bonded permanent magnet with large magnetic force and a high maximum energy product, which magnetic properties do not decrease even after the long periods of time. The surface-treated magnetic powder is obtained by treating a magnetic powder made of an alloy that comprises a rare earth metal and iron with a treatment agent containing a alkali-modified silica particles as a major component, wherein the alkali-modified silica particles are obtained by reacting silica particles with a mean particle diameter of from 0.005 to 0.1 .mu.m with an alkali to modify only the surface portion of the silica particles by the alkali.

REFERENCES:
patent: 4336310 (1982-06-01), Okuyama et al.
patent: 4475946 (1984-10-01), Matsufuji et al.

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