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US 7,740,715 B2Granted
R-T-B based sintered magnet
AssigneeHitachi Metals, Ltd.
InventorHiroyuki Tomizawa
Life of this patent
Estimating the term…
Abstract
An R-T-B based sintered magnet according to the present invention has a composition comprising: 12 at % to 15 at % of a rare-earth element R; 5.0 at % to 8.0 at % of boron B; 0.1 at % to at % of Al; 0.02 at % to less than 0.2 at % of Mn; and a transition metal T as the balance. The rare-earth element R is at least one element selected from the rare-earth elements, including Y (yttrium), and includes at least one of Nd and Pr. The transition element T includes Fe as its main element.
Claims6
An R-T-B based sintered magnet having a composition comprising:
- 12 at % to 15 at % of a rare-earth element R;
- 5.0 at % to 8.0 at % of B;
- 0.1 at % to 1.0 at % of Al;
- 0.02 at % to less than 0.2 at % of Mn;
- and
- a transition metal T as the balance;
- wherein
- the rare-earth element R is at least one element selected from a group of elements consisting of the rare-earth elements and Y and includes at least one of Nd and Pr;
- and
- the transition metal T includes Fe as its main element.
7 more elements
An R-T-M-B based sintered magnet having a composition comprising:
- 12 at % to 15 at % of a rare-earth element R;
- 5.0 at % to 8.0 at % of B;
- 0.1 at % to 1.0 at % of Al;
- 0.02 at % to less than 0.2 at % of Mn;
- more than 0 at % to 5.0 at % (in total) of additive elements M;
- and
- a transition metal T as the balance;
- wherein
- the rare-earth element R is at least one element selected from a group of elements consisting of the rare-earth elements and Y and includes at least one of Nd and Pr;
- the additive element M is at least one element selected from the group consisting of Ni, Cu, Zn, Ga, Ag, In, Sn, Bi, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta and W;
- and
- the transition metal T includes Fe as its main element.
9 more elements
Dependencies are inferred from the claim text.