| 简介 |
PROBLEM TO BE SOLVED : To solve the problem that, as when shifting to a component side of R of low concentration in a R-T-B-based magnet alloy, a ratio that a R-rich phase is present is decreased, densification cannot be expected when sintered to a magnet, and further an improvement cannot be expected in coercive force. SOLUTION : In a rare-earth magnet alloy agglomeration, an R-T-B-based magnet alloy contains an element of a type or more of Nd, Pr and Dy having 11.8 to 15.2 atomic % in all and B of 5.6 to 7.9 atomic % (R is of a type out of rare-earth elements containing Y, T has Fe as a main component, and a part thereof can be replaced with Co, Ni, or the like). Still, in a state of being cast, an R-rich phase of length 100 μm or more is not found substantially in cross section. In a method for manufacturing the rare-earth magnet alloy agglomeration, a melt 31 is received by a rotator 5 and is scattered by rotation of the rotator, and the scattered melt is deposited and fixed 7 on an inner plane of a rotating cylindrical die 4 of which the inner plane has a recessed and/or projected unsmoothed surface. |
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