Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1991-12-31
1993-02-16
Howard, Jacqueline
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148302, 252 62057, 252 62058, H01F 104
Patent
active
051867613
ABSTRACT:
An anisotropic magnetic alloy having a columnar macrostructure is provided. The magnetic alloy is prepared by melting and casting an R-Fe-B alloy in order to make a magnetic alloy having a columnar macrostructure and heat treating the cast alloy at a temperature of greater than or equal to about 250.degree. C. in order to magnetically harden the magnetic alloy. Alternatively, the cast alloy can be hot processed at a temperature greater than or equal to about 500.degree. C. in order to align the axes of the crystal grains in a specific direction and make the magnetic alloy anisotropic. In another embodiment, the cast alloy can be hot processed at a temperature of greater than or equal to about 500.degree. C. and then heat treated at a temperature of greater than or equal to about 250.degree. C.
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Akioka Koji
Kobayashi Osamu
Shimoda Tatsuya
Howard Jacqueline
Seiko Epson Corporation
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