Method for manufacturing a rare earth element--iron--boron permanent magnet
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United States of America Patent
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Oct 15, 2002
Grant Date -
Jul 5, 2001
app pub date -
Jan 29, 2001
filing date -
Sep 6, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a method for manufacturing a permanent magnet, a powder of a magnetic base alloy and powders of at least two binder alloys are mixed. The magnetic base alloy has a general formula SE.sub.2 T.sub.14 B, wherein SE is at least one rare earth element, including Y, and T is Fe or a combination of Fe and Co, wherein Co does not exceed 40 wt % of the combination of Fe and Co. The two binder alloys have respective general formulas SE.sub.6 (Fe,Co).sub.13-x Ga.sub.1+x and SE.sub.2 Co.sub.3. The base alloy and the at least two binder alloys are mixed in a weight ratio between 99:1 and 89:11. The mixture is then compressed and is subsequently sintered in a vacuum and/or in an inert gas atmosphere.
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