Rare earth magnet alloy ingot, manufacturing method for the...

Details Rare earth magnet alloy ingot, manufacturing method for the... Rare earth magnet alloy ingot, manufacturing method for the...

2006-01-12

2008-10-07

Sheehan, John P. (Department: 1793)

Metal founding

Process

Shaping liquid metal against a forming surface

C075S333000, C148S302000

Reexamination Certificate

active

07431070

ABSTRACT:
One object of the present invention is to provide a rare earth magnet alloy ingot, which has improved magnetic properties. In order to achieve the object, the present invention provides a rare earth magnet alloy ingot, wherein the rare earth magnet alloy ingot comprises an R-T-B type magnet alloy (R represents at least one element selected from among rare earth elements, including Y; and T represents a substance predominantly comprising Fe, with a portion of Fe atoms being optionally substituted by Co, Ni, Cu, Al, Ga, Cr, and Mn) containing at least one element selected from among Nd, Pr, and Dy in a total amount of 11.8 to 16.5% by atom and B in an amount of 5.6 to 9.1% by atom; and wherein as determined in an as-cast state of the alloy ingot, R-rich phase that measures 100 μm or more is substantially absent on a cross section.

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