R-T-B based permanent magnet
AssigneeTDK Corporation
InventorAtsushi Koda
Life of this patent
Estimating the term…
Abstract
An R-T-B based permanent magnet includes rare earth elements, transition metal elements, boron, and M. An amount of boron is within a range between 0.90 mass % or more and 1.00 mass % or less. An amount of carbon is within a range between 0 mass % or more and 0.10 mass % or less, an amount of oxygen is within a range between 0 mass % or more and 0.15 mass % or less, an amount of nitrogen is within a range between 0 mass % or more and 0.15 mass % or less, an amount of M is within a range between 0.30 mass % or more and 1.50 mass % or less, an amount of the rare earth elements based on mass represented by TRE is within a range between 29.00 mass % or more and 31.00 mass % or less, and a value represented by Pr/TRE is within a range between 0.30 or larger and 0.50 or smaller.
Claims19
An R-T-B based permanent magnet, comprising:
- rare earth elements, transition metal elements, boron, and M;
- wherein
- the rare earth elements at least include Nd and Pr,
- the transition metal elements at least include Fe and Co,
- M includes one or more selected from the group consisting of Al, Cu, Ga, and Zr,
- an amount of a heavy rare earth element is within a range between 0 mass % or more and 0.20 mass % or less,
- an amount of cobalt is within a range between 1.10 mass % or more and 1.50 mass % or less,
- an amount of boron is within a range between 0.90 mass % or more and 1.00 mass % or less,
- an amount of carbon is within a range between 0 mass % or more and 0.10 mass % or less,
- an amount of oxygen is within a range between 0 mass % or more and 0.15 mass % or less,
- an amount of nitrogen is within a range between 0 mass % or more and 0.15 mass % or less,
- an amount of M is within a range between 0.30 mass % or more and 1.50 mass % or less,
- an amount of the rare earth elements based on mass represented by TRE is within a range between 29.00 mass % or more and 31.00 mass % or less, and
- a value represented by Pr/TRE which is obtained by dividing Pr based on mass by TRE is within a range between 0.30 or larger and 0.50 or smaller.
An R-T-B based permanent magnet, comprising:
- rare earth elements, transition metal elements, boron, and M;
- wherein
- the rare earth elements at least include Nd and Pr,
- the transition metal elements at least include Fe or a combination of Fe and Co,
- M includes one or more selected from the group consisting of Al, Cu, Ga, and Zr,
- an amount of a heavy rare earth element is within a range between 0 mass % or more and 0.20 mass % or less,
- an amount of boron is within a range between 0.90 mass % or more and 1.00 mass % or less,
- an amount of carbon is within a range between 0.02 mass % or more and 0.10 mass % or less,
- an amount of oxygen is within a range between 0 mass % or more and 0.15 mass % or less,
- an amount of nitrogen is within a range between 0 mass % or more and 0.15 mass % or less,
- an amount of M is within a range between 0.30 mass % or more and 1.50 mass % or less,
- an amount of the rare earth elements based on mass represented by TRE is within a range between 29.00 mass % or more and 31.00 mass % or less,
- a value represented by Pr/TRE which is obtained by dividing Pr based on mass by TRE is within a range between 0.30 or larger and 0.50 or smaller, and
- Pr/C is 120 or larger and 600 or smaller in which Pr/C represents a value obtained by dividing the amount of Pr based on mass by the amount of carbon based on mass.
Dependencies are inferred from the claim text.