Magnetically anisotropic R-T-B magnet

Details Magnetically anisotropic R-T-B magnet Magnetically anisotropic R-T-B magnet

1990-11-14

1992-11-10

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148104, 419 11, 419 34, 419 35, H01F 102

Patent

active

051620634

ABSTRACT:
A magnetically anisotropic R-T-B magnet having crystal grains having aspect ratios of 2 or more and showing a substantially uniform maximum energy product distribution is produced by (a) rapidly quenching an alloy melt; (b) finely pulverizing the rapidly quenched alloy to provide magnetic powder; (c) mixing the magnetic powder with a carbon-containing additive; (d) coating the resulting mixture with a protective layer of a first lubricant such as BN substantially unreactive with the alloy components; (e) compressing it; (f) further coating the resulting compressed body with a second lubricant such as graphite or graphite+glass; and (g) further compressing it.

REFERENCES:
patent: 4780226 (1988-10-01), Sheets et al.
patent: 4952251 (1990-08-01), Iwasaki et al.
patent: 4978398 (1990-12-01), Iwasaki et al.

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