Patent ID: 7014718
Filing Date: 2006-03-21
Classification: B22D,B22F,B82Y,C22C,H01F

Abstract:
1. A rare earth magnet alloy ingot, wherein the rare earth magnet alloy ingot comprises an R-T-B 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, the as-cast state contains an R-rich phase that has a maximum width of 50 μm, and the area occupied by the R-rich phase accounts for at least 50% of the cross section of the as-cast state.