Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Reexamination Certificate
2005-11-28
2009-06-16
Sheehan, John P. (Department: 1793)
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
C148S101000, C148S302000
Reexamination Certificate
active
07547365
ABSTRACT:
To make a raw alloy, consisting mostly of amorphous structure, highly productively and at a reduced cost for a nanocomposite magnet, a molten alloy represented by Fe100-x-y-zRxQyMz(where R is at least one element selected from Pr, Nd, Dy and Tb; Q is B and/or C; M is at least one element selected from Co, Al, Si, Ti, V, Cr, Mn, Ni, Cu, Ga, Zr, Nb, Mo, Ag, Pt, Au and Pb; and 1 at %≦x<6 at %, 15 at %≦y≦30 at % and 0 at %≦z≦7 at %) is prepared. This molten alloy is rapidly cooled by a strip casting process in which the alloy is fed onto a chill roller, rotating at a peripheral velocity of 3 m/s to less than 20 m/s, at a feeding rate per unit contact width of 0.2 kg/min/cm to 5.2 kg/min/cm. In this manner, an alloy including at least 60 volume percent of amorphous phase can be obtained.
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Hirosawa Satoshi
Kanekiyo Hirokazu
Murakami Ryo
Hitachi Metals Ltd.
Keating & Bennett LLP
Sheehan John P.
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