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US 8,298,351 B2Granted
R-T-B rare earth sintered magnet
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsKazuya Fukui, Takahiro Hashimoto
Life of this patent
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Abstract
A rare earth sintered magnet consists essentially of 26-36 wt % R, 0.5-1.5 wt % B, 0.1-2.0 wt % Ni, 0.1-3.0 wt % Si, 0.05-1.0 wt % Cu, 0.05-4.0 wt % M, and the balance of T and incidental impurities wherein R is a rare earth element, T is Fe or Fe and Co, M is selected from Ga, Zr, Nb, Hf, Ta, W, Mo, Al, V, Cr, Ti, Ag, Mn, Ge, Sn, Bi, Pb, and Zn. Simultaneous addition of Ni, Si, and Cu ensures magnetic properties and corrosion resistance.
Claims5
A R-T-B rare earth sintered magnet in the form of a sintered body having a composition consisting essentially of, in % by weight,
- 26 to 36% of R,
- 0.5 to 1.3% of B,
- 0.1 to 2.0% of Ni,
- 0.1 to 3.0% of Si,
- 0.05 to 1.0% of Cu,
- 0.05 to 4.0% of M, and
- the balance of T and incidental impurities,
- wherein R is one or more element selected from rare earth elements including Y and Sc,
- T is Fe or Fe and Co,
- M is one or more element selected from the group consisting of Ga, Zr, Nb, Hf, Ta, W, Mo, Al, V, Cr, Ti, Ag, Mn, Ge, Sn, Bi, Pb, and Zn, and
- a phase of compound containing R, Co, Si, Ni and Cu precipitates within the sintered body.
8 more elements
Dependencies are inferred from the claim text.