Magnetically anisotropic R-T-B magnet

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

1992-07-13

1994-02-15

Sheehan, John P.

Metal treatment

Stock

Magnetic

75244, H01F 1053

Patent

active

052863085

ABSTRACT:
A magnetically anistropic 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
patent: 4921553 (1990-05-01), Tokunaga et al.
patent: 4952251 (1990-08-01), Iwasaki et al.
patent: 4978398 (1990-12-01), Iwasaki et al.
patent: 5009706 (1991-04-01), Sakamoto et al.

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