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AssigneeShowa Denko K.K.
InventorsHiroshi Hasegawa, Shiro Sasaki, Uremu Hosono, Masaaki Yui
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The present invention is an alloy lump for R-T-B type sintered magnets, including an R2T14B columnar crystal and an R-rich phase (in which R is at least one rare earth element including Y, T is Fe or Fe with at least one transition metal element except for Fe, and B is boron or boron with carbon), in which in the as-cast state, R-rich phases nearly in the line-like or rod-like shape (the width direction of the line or rod is a short axis direction) are dispersed in the cross section, and the area percentage of the region where R2T14B columnar crystal grains have a length of 500 μm or more in the long axis direction and a length of 50 μm or more in the short axis direction is 10% or more of the entire alloy.
An alloy lump for R-T-B type sintered magnets, comprising an R2T14B columnar crystal and an R-rich phase (wherein R is at least one rare earth element including Y, T is Fe or Fe with at least one transition metal element except for Fe, and B is boron or boron with carbon), wherein in the as-cast state, R-rich phases nearly in the line-like or rod-like shape (the width direction of the line or rod is a short axis direction) are dispersed in the cross section, and the area percentage of the region where R2T14B columnar crystal grains have a length of 500 μm or more in the long axis direction and a length of 50 μm or more in the short axis direction is 10% or more of the entire alloy.
An alloy lump for R-T-B type sintered magnets, comprising an R2T14B columnar crystal and an R-rich phase (wherein R is at least one rare earth element including Y, T is Fe or Fe with at least one transition metal element except for Fe, and B is boron or boron with carbon), wherein in the as-cast state, the area percentage of R-rich phases having a length of 5 μm or more in the short axis direction is 10% or less of all R-rich phases present in the alloy, and the area percentage of the region where R2T14B columnar crystal grains have a length of 500 μm or more in the long axis direction and a length of 50 μm or more in the short axis direction is 10% or more of the entire alloy.
Dependencies are inferred from the claim text.