Method for forming samarium-iron-nitride magnet alloys

Details Method for forming samarium-iron-nitride magnet alloys Method for forming samarium-iron-nitride magnet alloys

1993-11-18

1995-03-07

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148122, 148221, H01F 102

Patent

active

053954599

ABSTRACT:
In a preferred method, a molten alloy of samarium and iron is formed with a proportion of about 1:4 to about 1:9 of samarium to iron. The molten alloy is then quenched in a non-oxidizing environment at a rate sufficient to form a solid crystalline alloy in the form of a thin ribbon. The ribbon is comminuted to form a powder and the powder is nitrided in a gaseous nitrogen atmosphere. Nitriding causes nitrogen to penetrate and occupy interstitial sites in the Sm-Fe alloy, producing a magnetically hard powder with a high coercivity typically 10 kOe, usually greater than 15 kOe and as high as about 20 to about 23 kOe.

REFERENCES:
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J. M. D. Coey et al, J. Magn. Magn. Mat. 87, L251 (1990).
Hong Sun et al, J. Phys. CM2, 6465 (1990).
J. M. D. Coey et al, Paper No. S1.3 at the Sixth International . . . Pittsburgh, Pa. 15213 USA Oct. 1990.
K. Schnitzke et al, Appl. Phys. Lett. 57 (26), 1990, pp. 2853-2855.

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