Method for forming samarium-iron-nitride magnet alloys
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United States of America Patent
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Mar 7, 1995
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Nov 18, 1993
filing date -
Jun 8, 1992
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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.
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