| Sonstiges: |
- Nachgewiesen in: USPTO Patent Applications
- Sprachen: English
- Document Number: 20240194379
- Publication Date: June 13, 2024
- Appl. No: 18/536652
- Application Filed: December 12, 2023
- Claim: 1. An R-T-B based permanent magnet material, wherein the R is selected from one or two of neodymium (Nd) and praseodymium (Pr); 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, non-metal elements, and light rare earth elements; a grain boundary of the permanent magnet material comprises an M compound selected from one, two, or more of compounds M-R and M-T-R; preferably, the M is preferably selected from one or more of Cu, Ga, Al, Zr, Ti, Sn, Ta, and Mn, such as one or more of Cu, Ga, and Al; the R is selected from Nd and NdPr; the T is selected from iron and a mixture of iron and another metal element, wherein the another metal element can be selected from one or more of transition metal elements other than iron; for example, the another metal element can be selected from one or more of copper (Cu), gallium (Ga), aluminum (Al), zirconium (Zr), titanium (Ti), tin (Sn), tantalum (Ta), and manganese (Mn).
- Claim: 2. The R-T-B based permanent magnet material according to claim 1, wherein the grain boundary of the permanent magnet material comprises a grain boundary phase selected from one or two of grain boundary phases of compounds M-R and M-T-R, for example, selected from one or two of grain boundary phases of M-Nd and M-Fe—Nd; preferably, the grain boundary of the permanent magnet material comprises an enrichment region selected from grain boundary phases of M-R and/or M-T-R, wherein the enrichment region of M-R and/or M-T-R in the grain boundary phases refers to a region in which the concentration of the compound M-R and/or M-T-R is not less than 115% of an average concentration of an entire scanning region; more preferably, the enrichment region of M-R and/or M-T-R in the grain boundary phases accounts for 2% to 18%, preferably 5% to 15%, even more preferably 8% to 12%, of an entire visual field area.
- 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 0.3% and not more than 3.5%, based on the mass of the permanent magnet material; for example, the permanent magnet material comprises Ga; preferably, the mass percentage of the Ga is not less than 0.1% and not more than 0.6%, based on the mass of the permanent magnet material; for example, the permanent magnet material comprises Co; preferably, the mass percentage of the Co is not less than 0% and not more than 3.0%, preferably not less than 0% and not more than 3.0%, based on the mass of the permanent magnet material; for example, the permanent magnet material comprises Cu; preferably, the mass percentage of the Cu is not less than 0% and not more than 0.4%, preferably not less than 0% and not more than 0.4%, based on the mass of the permanent magnet material; preferably, the balance of the permanent magnet material is Fe and an inevitable impurity.
- Claim: 4. The R-T-B based permanent magnet material according to claim 1, comprising a heavy rare earth element; wherein the heavy rare earth element can be selected from one or more of gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, and yttrium; preferably, a region A with an element concentration of the M being not less than 0.15 at % is present in a cross section of the permanent magnet material and in an R-rich phase, and the ratio of the area of the region A to the area of the R-rich phase is preferably not less than 80%, more preferably not less than 90%.
- Claim: 5. A mixture of R-T-B based alloy powders, comprising the R-T-B based alloy powders and an M compound selected from one or more of M compounds, wherein the R, T, B, and M independently have the definitions as defined in claim 1; preferably, the M compound is adhered to the surface of the R-T-B based alloy powders; for example, at least a part of the surface of the alloy powders is covered with the M compound; more preferably, the surface of the alloy powders is preferably completely coated with the M compound to form a coating layer; more preferably, the mass percentage of the M compound in the mixture is 0.01% to 5.0%, preferably 0.05% to 3.0%, more preferably 0.1% to 2.0%, based on the mass of the R-T-B based alloy powders in the mixture; more preferably, the mixture of the R-T-B based alloy powders does not comprise a heavy rare earth element; for example, the M compound is selected from one or more of hydrides, carbides, oxides, nitrides, fluorides, and oxyfluorides of the M.
- Claim: 6. An R-T-B based magnet substrate, comprising a sintered substrate comprising the mixture of the R-T-B based alloy powders, and a heavy rare earth element; wherein for example, the heavy rare earth element is adhered to the surface of the substrate.
- Claim: 7. A method for preparing the R-T-B based permanent magnet material according to claim 1, comprising: performing a heat treatment on an R-T-B based magnet substrate, wherein the R-T-B based magnet substrate, comprising a sintered substrate comprising the mixture of the R-T-B based alloy powders, and a heavy rare earth element, the heavy rare earth element is adhered to the surface of the substrate, preferably, the heat treatment includes a thermal diffusion treatment and a tempering treatment.
- Claim: 8. A method for preparing the mixture of the R-T-B based alloy powders according to claim 5, comprising: enabling the R-T-B based alloy powders to be in contact with the M compound selected from one or more of M compounds.
- Claim: 9. A method for preparing the R-T-B based magnet substrate according to claim 6, comprising: molding the R-T-B based alloy powders into a molded body of the R-T-B based alloy powders; sintering the molded body to obtain a sintered substrate comprising the R-T-B based alloy powders; and enabling the heavy rare earth element to be in contact with the sintered substrate comprising the R-T-B based alloy powders; wherein preferably, the heavy rare earth element is in contact with the sintered substrate comprising the R-T-B based alloy powders to form a coating layer of the heavy rare earth element on the surface of the substrate.
- 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, magnetic resonance imaging devices, and the like, 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; 22
|
