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Sintered Neodymium-iron-boron Magnet and Preparation Method Therefor
| Content Provider | The Lens |
|---|---|
| Abstract | A sintered neodymium iron boron magnet as shown in the formula RxT1ioo-x-y1-y2-zMy1Ay2Bz is provided according to the present application, which specifically includes three different technical solutions. In the A alloy element, zirconium, zirconium or niobium is added and the specific addition amount is optimized and designed, and the remaining components are specially designed to improve the remanence, coercivity and magnetic energy product of the magnet alloy, which have a relatively high performance. The production cost is reduced, the process is simple, the applicability is wide, and it is suitable for large-scale industrial production. |
| Related Links | https://www.lens.org/images/patent/EP/4105951/A1/EP_4105951_A1.pdf |
| Language | English |
| Publisher Date | 2022-12-21 |
| Access Restriction | Open |
| Alternative Title | Gesinterter Neodym-eisen-bor-magnet Und Herstellungsverfahren Dafür Aimant Néodyme-fer-bore Fritté Et Son Procédé De Préparation |
| Content Type | Text |
| Resource Type | Patent |
| Date Applied | 2021-07-05 |
| Agent | Lavoix |
| Applicant | Jl Mag Rare Earth Co Ltd |
| Application No. | 21926047 |
| Claim | A sintered neodymium iron boron magnet is shown in formula (I); RxT100-x-y1-y2-zMy1Ay2Bz (I); in technical solution 1: x, y1, y2 and z are mass percentages of corresponding elements, 28.5%≤x≤32.5%, 0%≤y1≤1.0%, 0.67%≤y2≤2.4%, 0.85%≤z≤1.0%; R is selected from one or more of Pr, Nd, Dy, Tb and Ho; M is selected from one or more of Ti, Nb, Hf and Mn; and a content of Ti is 0 to 0.12%, a content of Nb is 0 to 0.29%, a content of Hf is 0 to 1.0%, and a content of Mn is 0 to 1.0%; A is Cu, Ga, Al and Zr; and T is selected from Fe and Co, a content of Co is 0.3% to 2.5%, and surplus is Fe; or, in technical solution 2: x, y1, y2 and z are mass percentages of corresponding elements, 28.5%≤x≤32.0%, 0%≤y1≤1.0%, 0.60%≤y2≤2.30%, 0.86%≤z≤0.98% ; R is selected from one or more of Pr, Nd, La, Ce, Dy, Tb and Ho; M is selected from one or more of Zr, Nb, Hf and Mn, and a content of Zr is 0 to 0.19%, a content of Nb is 0 to 0.29%, a content of Hf is 0 to 1.0%, and a content of Mn is 0 to 1.0%; A is Cu, Ga, Al and Ti, and a content of Cu is 0.2% to 0.55%, a content of Ga is 0.25% to 0.55%, a content of Al is 0.02% to 0.8%, and a content of Ti is 0.13% to 0.4%; and T is selected from Fe and Co, a content of Co is 0.2% to 2.0%, and surplus is Fe; or, in technical solution 3: x, y1, y2 and z are mass percentages of corresponding elements, 28.7%≤x≤32.8%, 0%≤y1≤1.0%, 0.77%≤y2≤2.60%, 0.86%≤z≤1.01% ; R is selected from one or more of Pr, Nd, Dy and Tb, M is selected from one or more of Ti, Zr, Hf and Mn, and a content of Zr is 0 to 0.19%, a content of Ti is 0 to 0.12%, a content of Hf is 0 to 1.0%, and a content of Mn is 0 to 1.0%; A is Cu, Ga, Al and Nb, and a content of Cu is 0.2% to 0.55%, a content of Ga is 0.25% to 0.55%, a content of Al is 0.02% to 0.7%, and a content of Nb is 0.3% to 0.8%; and T is selected from Fe and Co, a content of Co is 0.4% to 2.3%, and surplus is Fe. The sintered neodymium iron boron magnet according to claim 1, wherein, for the technical solution 1: a content of Pr is 0 to 14.5%, a content of Nd is 14% to 32.5%, a content of Tb is 0 to 5.0%, and a content of Dy is 0 to 5.0%. The sintered neodymium iron boron magnet according to claim 2, wherein the content of Pr is 5% to 10%, the content of Nd is 20% to 25.5%, and the content of Dy is 0 to 3%. The sintered neodymium iron boron magnet according to claim 1, wherein, for the technical solution 1: a content of Cu is 0.2% to 0.6%, a content of Ga is 0.25% to 0.55%, a content of Al is 0.02% to 0.6%, and a content of Zr is 0.2% to 0.65%. The sintered neodymium iron boron magnet according to claim 1, wherein, for the technical solution 1: a content of Cu is 0.3% to 0.5%, a content of Ga is 0.35% to 0.5%, a content of Al is 0.1% to 0.5%, and a content of Zr is 0.3% to 0.6%. The sintered neodymium iron boron magnet according to claim 1, wherein, for the technical solution 1: the content of Co is 0.5% to 2.0%, and a content of B is 0.90% to 0.98%. The sintered neodymium iron boron magnet according to claim 1, wherein, for the technical solution 1: M is selected from one or both of Ti and Nb, the content of Ti is 0 to 0.1%, and the content of Nb is 0 to 0.15%. The sintered neodymium iron boron magnet according to claim 1, wherein, for the technical solution 2: a content of Pr is 0 to 14.5%, a content of Nd is 14% to 32.5%, a content of Tb is 0 to 4.5%, and a content of Dy is 0 to 4.5%. The sintered neodymium iron boron magnet according to claim 8, wherein the content of Pr is 7% to 9%, the content of Nd is 20% to 25.5%, and the content of Dy is 0 to 3%. The sintered neodymium iron boron magnet according to claim 1, wherein, for the technical solution 2: a content of Cu is 0.2% to 0.5%, a content of Ga is 0.35% to 0.45%, a content of Al is 0.1% to 0.6%, and a content of Ti is 0.2% to 0.35%. The sintered neodymium iron boron magnet according to claim 1, wherein, for the technical solution 2: the content of Co is 0.5% to 1.5%, and a content of B is 0.90% to 0.98%. The sintered neodymium iron boron magnet according to claim 1, wherein, for the technical solution 2: M is selected from one or both of Zr and Nb, the content of Zr is 0 to 0.15%, and the content of Nb is 0 to 0.20%. The sintered neodymium iron boron magnet according to claim 1, wherein, for the technical solution 3: a content of Pr is 0 to 14.5%, a content of Nd is 14.5% to 32%, a content of Tb is 0 to 4.3%, and a content of Dy is 0 to 4.3%. The sintered neodymium iron boron magnet according to claim 13, wherein, for the technical solution 3: the content of Pr is 5% to 10%, the content of Nd is 20% to 26%, and the content of Dy is 1.5% to 3%. The sintered neodymium iron boron magnet according to claim 1, wherein, for the technical solution 3: a content of Cu is 0.25% to 0.50%, a content of Ga is 0.30% to 0.45%, a content of Al is 0.1% to 0.45%, and a content of Nb is 0.4% to 0.55%. The sintered neodymium iron boron magnet according to claim 1, wherein, for the technical solution 3: the content of Co is 0.5% to 1.5%, and a content of B is 0.90% to 0.96%. The sintered neodymium iron boron magnet according to claim 1, wherein, for the technical solution 3: M is selected from one or both of Zr and Ti, the content of Zr is 0 to 0.15%, and the content of Ti is 0 to 0.10%. A method of preparing the sintered neodymium iron boron magnet according to any one of claims 1 to 17, comprising the following steps: A) carrying out a strip casting treatment to a raw material of a neodymium iron boron sintered magnet to obtain neodymium iron boron strip casting; B) carrying out hydrogen decrepitation and jet milling on the neodymium iron boron strip casting in sequence to obtain neodymium iron boron powder; and C) orientation molding and sintering the neodymium iron boron powder in sequence to obtain the sintered neodymium iron boron magnet. The method according to claim 18, wherein a temperature of the strip casting treatment is 1400°C to 1500°C, and a thickness of the neodymium iron boron strip casting is 0.10mm to 0.60mm; in the hydrogen decrepitation process, a hydrogen absorption time is 1h to 3h, a hydrogen absorption temperature is 20°C to 300°C, a dehydrogenation time is 3h to 7h, and a dehydrogenation temperature is 550°C to 600°C; and in the jet milling process, a lubricant is added for milling, and the lubricant is 0.02% to 0.1% of a mass of a mixed fine powder obtained by the hydrogen decrepitation, and a particle size of the je milled powder is 2µm to 10µm The method according to claim 18, wherein, the orientation molding comprises orientation pressing and isostatic pressing in sequence; a magnetic field strength of the orientation molding is 1.2T to 3T; a sintering temperature is 1000°C to 1200°C, a time is 5h to 15h, and a vacuum degree is less than or equal to 0.02Pa; wherein the method further comprises an aging treatment after sintering, and the aging treatment comprises a first aging treatment and a second aging treatment; a temperature of the first aging treatment is 800°C to 980°C, and a time of the first aging treatment is 2h to 15h; and a temperature of the second aging treatment is 420°C to 580°C, and a time of the second aging treatment is 1h to 8h. |
| CPC Classification | Magnets;Inductances;Transformers;Selection Of Materials For Their Magnetic Properties ALLOYS WORKING METALLIC POWDER;MANUFACTURE OF ARTICLES FROM METALLIC POWDER;MAKING METALLIC POWDER ;APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER |
| Extended Family | 113-485-377-786-468 186-120-731-177-793 120-716-588-640-142 100-255-495-127-185 005-026-679-638-366 165-033-933-101-597 162-920-024-386-718 155-199-153-519-156 099-575-547-891-062 |
| Patent ID | 4105951 |
| Inventor/Author | Mao Huayun Mao Congyao Huang Zhifeng Sun Changshan Chen Yunpeng |
| IPC | H01F1/057 C22C38/14 H01F41/02 |
| Status | Pending |
| Simple Family | 165-033-933-101-597 155-199-153-519-156 100-255-495-127-185 005-026-679-638-366 |
| CPC (with Group) | H01F1/0577 H01F1/0573 C22C38/005 C22C38/002 C22C38/16 C22C38/06 C22C38/12 C22C38/14 C22C33/04 C22C2202/02 C22C33/0278 B22F2009/044 B22F2009/048 B22F9/04 B22F2998/10 B22F1/05 H01F41/0273 |
| Issuing Authority | European Patent Office (EPO) |
| Kind | Patent Application Publication |
