Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1993-03-19
2000-10-24
Sheehan, John
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148120, 148302, H01F 1057
Patent
active
061360996
ABSTRACT:
A rare earth-iron series magnet formed from an alloy ingot using a one-step hot working process is provided. The alloy ingot includes between about 8 and 30 atomic percent of at least one rare earth element, between about 2 and 28 atomic percent of boron, less than about 50 atomic percent of cobalt, less than about 15 atomic percent of aluminum and the balance of iron and other impurities that are inevitably included during the preparation process. The alloy is cast to obtain a cast ingot and the hot working is performed on the cast ingot at a temperature of greater than about 500.degree. C. in order to make the crystal grains of the ingot fine and to align the axis of the grains in a desired direction.
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Akioka Koji
Ishibashi Toshiyuki
Kobayashi Osamu
Ozaki Ryuichi
Shimoda Tatsuya
Seiko Epson Corporation
Sheehan John
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