R-t-b based permanent magnet
AssigneeTDK Corporation
InventorsHiroshi DOTO, Kiyoyuki MASUZAWA, Makoto NAKANE
Life of this patent
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Abstract
An R-T-B based permanent magnet in which R is a rare earth element, T is Fe and Co, and B is boron. R at least includes Dy. The R-T-B based permanent magnet includes M, and M is at least one or more elements selected from the group consisting of Cu, Ga, Al, Mn, Zr, Ti, Cr, Ni, Nb, Ag, Hf, Ta, W, Si, Bi, and Sn. M at least includes Cu. A total content of R is 28.0 mass % to 30.2 mass %, a content of Dy is 1.0 mass % to 6.5 mass %, a content of Cu is 0.04 mass % to 0.50 mass %, a content of Co is 0.5 mass % to 3.0 mass %, and a content of B is 0.85 mass % to 0.95 mass %.
Claims20
An R-T-B based permanent magnet comprising M wherein,
- R is a rare earth element, T is Fe and Co, and B is boron,
- R at least includes Dy,
- M is one or more elements selected from Cu, Ga, Al, Mn, Zr, Ti, Cr, Ni, Nb, Ag, Hf, Ta, W, Si, Bi, and Sn,
- M at least includes Cu, and
- a total content of R is 28.0 mass % to 30.2 mass %, a content of Dy is 1.0 mass % to 6.5 mass %, a content of Cu is 0.04 mass % to 0.50 mass %, a content of Co is 0.5 mass % to 3.0 mass %, and a content of B is 0.85 mass % to 0.95 mass %.
Dependencies are inferred from the claim text.