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- Nachgewiesen in: USPTO Patent Applications
- Sprachen: English
- Document Number: 20240194380
- Publication Date: June 13, 2024
- Appl. No: 18/536724
- Application Filed: December 12, 2023
- Claim: 1. An R-T-B based permanent magnet material, wherein the R is selected from one, two, or more of neodymium (Nd), praseodymium (Pr), gadolinium (Gd), holmium (Ho), dysprosium (Dy), and terbium (Tb); the T comprises at least iron (Fe); the B is boron; the permanent magnet material further comprises M, wherein the M is selected from one or more of transition metal elements, low-melting-point metal elements, non-metal elements, and light rare earth elements; and an M oxide is present in a grain boundary phase of the permanent magnet material; preferably, the balance of the permanent magnet material is Fe, O, and an inevitable impurity; more preferably, the mass percentage of the O is 700 to 4000 ppm, based on the mass of the permanent magnet material.
- Claim: 2. The R-T-B based permanent magnet material according to claim 1, wherein the low-melting-point metal can be selected from metals having a melting point not more than 1300° C., and an example thereof can be one or more of copper (Cu), gallium (Ga), aluminum (Al), zirconium (Zr), titanium (Ti), tin (Sn), and manganese (Mn); the light rare earth element can be selected from one or more of elements such as lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), and the like; preferably, the M is selected from one or more of Cu, Ga, Al, Zr, Ti, Sn, Mn, B, V, and Se.
- Claim: 3. The R-T-B based permanent magnet material according to claim 1, wherein the mass percentage of the R is not less than 28.5% and not more than 32.5%, based on the mass of the permanent magnet material; the mass percentage of the B is not less than 0.88% and not more than 1.05%, based on the mass of the permanent magnet material; the total mass percentage of the M is not less than 0.1% and not more than 4.0%, preferably not less than 0.15% and not more than 2.5%, based on the mass of the permanent magnet material; preferably, the permanent magnet material comprises Co; for example, the mass percentage of the Co is not less than 0% and not more than 0.7%, more preferably not less than 0.1% and not more than 0.5%, based on the mass of the permanent magnet material.
- Claim: 4. The R-T-B based permanent magnet material according to claim 1, wherein the mass percentage of the O is 700 to 2000 ppm, based on the mass of the permanent magnet material.
- Claim: 5. The R-T-B based permanent magnet material according to claim 1, wherein an R-M-O rich phase is present in the grain boundary phase, preferably at a grain boundary triple point, of the permanent magnet material; preferably, in the grain boundary phase, preferably at the grain boundary triple point, of the permanent magnet material, the sum of the mass percentages of the M and the oxygen is not less than 20%, preferably not less than 40%; more preferably, the ratio of the mass percentages of the O at the grain boundary triple point to the O at a two-crystal grain boundary, of the permanent magnet material, is greater than 1, preferably not less than 1.5.
- Claim: 6. A metal composition, wherein the composition comprises metals R, T, and B as matrices, and M oxides present in the matrices; preferably, the composition is present in the form of a powder; the particle size of the powder can be not more than 500 μm, for example, 1 μm to 300 μm, preferably 1 μm to 50 μm; preferably, the mass percentage of the M oxides is not less than 0.05% and not more than 5.00%, preferably not less than 0.10% and not more than 3.00%, based on the mass percentage of the matrices in the composition.
- Claim: 7. A permanent magnet, comprising a sintered material obtained from the metal composition according to claim 6 subjected to sintering and a heat treatment, and a heavy rare earth element adhered to the sintered material and subjected to a heat treatment.
- Claim: 8. A method for preparing the R-T-B based permanent magnet material according to claim 1, comprising: molding the metal composition comprises metals R, T, and B as matrices, and M oxides present in the matrices into a molded body of the metal composition, wherein the metal composition comprises metals R, T, and B as matrices, and M oxides present in the matrices; sintering the molded body to obtain a sintered substrate comprising the metal composition; and enabling a heavy rare earth element to be in contact with the sintered substrate comprising the metal composition; wherein preferably, the heavy rare earth element is in contact with the sintered substrate comprising the metal composition to form a coating layer of the heavy rare earth element on the surface of the substrate.
- Claim: 9. The method according to claim 8, further comprising a step of preparing the metal composition, wherein the M oxides are mixed with the metals R, T, and B which are the matrices before hydrogen decrepitation.
- Claim: 10. Use of the R-T-B based permanent magnet material according to claim 1 in the fields of motors, loudspeakers, magnetic separators, computer disk drives, and magnetic resonance imaging devices, preferably use thereof as a motor rotor steel magnet in motors.
- Current International Class: 01; 22; 22; 22; 22; 22; 22; 22; 22; 22; 22; 22
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