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公开(公告)号：US20240355516A1
公开(公告)日：2024-10-24
申请号：US18631689
申请日：2024-04-10
IPC分类号： H01F1/059
CPC分类号： H01F1/0596
摘要： A Sm—Fe—N-based magnetic material capable of enhancing saturation magnetization while suppressing a decrease in the anisotropic magnetic field as much as possible even when the use amount of Sm is reduced, and a production method thereof, are provided.
The magnetic material of the present disclosure includes a main phase having a predetermined crystal structure. The composition of the main phase is represented by (Sm(1-x-y-z)LaxCeyR1z)2(Fe(1-p-q-s)CopNiqMs)17Nh, where R1 is a given rare earth element, etc. M is a given element, and 0.25≤x+y≤0.73, 0.25≤x≤0.73, x/(x+y)≥0.80, 0≤z≤0.10, 0.10≤p+q≤0.53, p+q≥1.45(x+y)−0.5485, 0≤s≤0.10 and 2.9≤h≤3.3 are satisfied. The production method of the present disclosure includes nitriding a precursor including a crystal phase having a composition represented by (Sm(1-x-y-z)LaxCeyR1z)2(Fe(1-p-q-s)CopNiqMs)17.-
2.发明公开公开(公告)号：US20240212899A1
公开(公告)日：2024-06-27
申请号：US18486470
申请日：2023-10-13
发明人： Haijun PENG , Yang LUO , Zilong WANG , Shengjie ZHU , Dunbo YU , Hongbin ZHANG , Weikang SHAN , Tianjiao MA , Shuai CUI
CPC分类号： H01F1/059 , B22F1/05 , B22F1/065 , B22F1/142 , B22F1/145 , B22F9/22 , C22C33/0235 , C22C38/001 , C22C38/005 , B22F2201/016 , B22F2201/02 , B22F2201/20 , B22F2301/355 , B22F2304/10 , B22F2998/10 , B22F2999/00 , C22C2202/02
摘要： Disclosed are anisotropic samarium-iron-nitrogen magnetic alloy powder and a preparation method therefor. The anisotropic samarium-iron-nitrogen magnetic alloy powder has a chemical formula of Sm2Fe17N3, and has a Th2Zn17 crystal structure. In the alloy powder, the granularity is: D90≤5 μm and D10≥0.5 μm, the average sphericity ≥0.7, the coercivity Hcj≥10 kOe, and the square degree Q≥0.5. The preparation method includes: S1: mixing iron powder, samarium oxide powder and calcium granules uniformly; S2: placing the mixture into a rotating heat treatment furnace, adding high-temperature-resistant balls, performing vacuumizing, introducing a reductive diffusion protective gas, and heating a furnace body; S3: cooling the furnace body, performing vacuumizing, and introducing a nitriding gas; and S4: taking out and separating the cooled powder and balls, washing the powder, and drying the powder in a vacuum environment to obtain the anisotropic samarium-iron-nitrogen magnetic alloy powder.
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公开(公告)号：US20240161975A1
公开(公告)日：2024-05-16
申请号：US18506354
申请日：2023-11-10
发明人： Hisashi MAEHARA , Tomonori INUZUKA , Masaaki ITO , Motoki HIRAOKA
IPC分类号： H01F41/02 , B22F1/052 , B22F1/142 , B22F1/145 , B22F1/16 , B22F3/14 , B22F3/16 , B22F3/24 , B22F9/22 , H01F1/059
CPC分类号： H01F41/0266 , B22F1/052 , B22F1/142 , B22F1/145 , B22F1/16 , B22F3/14 , B22F3/16 , B22F3/24 , B22F9/22 , H01F1/059 , H01F41/0273 , B22F2003/248 , B22F2201/013 , B22F2201/02 , B22F2201/11 , B22F2202/05 , B22F2301/355 , B22F2302/45 , B22F2998/10 , B22F2999/00
摘要： A method of producing a SmFeN-based rare earth magnet, the method including: heat-treating a SmFeN-based anisotropic magnetic powder having a surface coated with a phosphate at a temperature of at least 80° C. but lower than 150° C.; mixing the heat-treated SmFeN-based anisotropic magnetic powder and a Zn-containing modifier powder by dispersion using resin-coated metal media or resin-coated ceramic media to obtain a powder mixture containing the SmFeN-based anisotropic magnetic powder and the modifier powder; compacting the powder mixture in a magnetic field to obtain a magnetic field compact; and pressure-sintering the magnetic field compact to obtain a sintered compact.
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公开(公告)号：US20240006101A1
公开(公告)日：2024-01-04
申请号：US18253534
申请日：2021-09-30
申请人： NICHIA CORPORATION
发明人： Masahiro ABE , Satoshi YAMANAKA , Shuichi TADA , Kenta IWAI , Takayuki YANO
CPC分类号： H01F1/059 , H01F1/0558 , H01F1/0552
摘要： A method for producing a phosphate-coated SmFeN-based anisotropic magnetic powder, the method includes a phosphate treatment of adding an inorganic acid to a slurry containing an SmFeN-based anisotropic magnetic powder, water, and a phosphate compound to adjust a pH of the slurry to a range of 1 to 4.5 to form a phosphate-coated SmFeN-based anisotropic magnetic powder having a surface coated with a phosphate.
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公开(公告)号：US11862370B2
公开(公告)日：2024-01-02
申请号：US17723646
申请日：2022-04-19
发明人： Nengjun Yu , Jianghui Sun , Hangfu Yang , Minxiang Pan , Qiong Wu , Hongliang Ge
CPC分类号： H01F1/059 , H01F7/02 , H01F41/0266
摘要： The present invention discloses a high-resistivity sintered samarium-cobalt magnet and a preparation method thereof. According to the present invention, considering the specialty of sintered samarium-cobalt magnetic powder, fluoride or oxide is firstly prepared into nano-powder using high-energy ball milling, and the samarium-cobalt magnetic powder is prepared separately by rolling ball milling or high-speed jet milling, and then a certain electric field is applied in a fluoride suspension to drive the fluoride nano-powder to evenly cover a surface of the samarium-cobalt magnetic powder. The present invention breaks through the technical bottleneck that fluoride/oxide can improve the resistivity of a samarium-cobalt magnet but result in deterioration of the magnetic properties.
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公开(公告)号：US11676748B2
公开(公告)日：2023-06-13
申请号：US15387997
申请日：2016-12-22
申请人： NICHIA CORPORATION
发明人： Hisashi Maehara
CPC分类号： H01F1/059 , B22F1/052 , B22F9/18 , B22F9/24 , C22C38/005 , C22C38/12 , B22F2303/01 , B22F2304/10 , B22F2998/10 , B22F2999/00 , B22F2998/10 , B22F9/24 , B22F1/142 , B22F9/22 , B22F9/18 , B22F1/145 , B22F2999/00 , B22F1/145 , B22F2201/02
摘要： A method of producing anisotropic magnetic powders comprising obtaining a precipitate containing an element R, iron and lanthanum from a solution including R, iron and lanthanum, wherein R is at least one selected from the group consisting of Sc, Y, Pr, Nd, Pm, Sm, Gd, Tb, Dy, Ho, Er, Tm and Lu; obtaining an oxide containing R, iron and lanthanum from the precipitate; treating the oxide with a reducing gas to obtain a partial oxide; obtaining alloy particles by reduction diffusion of the partial oxide at a temperature in the range of 920° C. to 1200° C.; and nitriding the alloy particles to produce an anisotropic magnetic powder represented by the following general formula: Rv-xFe(100-v-w-z)NwLaxWz, where 3≤v−x≤30, 5≤w≤15, 0.08≤x≤0.3, and 0≤z≤2.5.
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公开(公告)号：US11594353B2
公开(公告)日：2023-02-28
申请号：US16505287
申请日：2019-07-08
申请人： NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY , Murata Manufacturing Co., Ltd.
发明人： Kenta Takagi , Wataru Yamaguchi , Takaaki Yokoyama , Kenji Sakaguchi , Kazuhiro Yoshii , Yuji Yokoyama
摘要： A sintered magnet contains Sm—Fe—N-based crystal grains and has high coercivity; and a magnetic powder is capable of forming a sintered magnet without lowering the coercivity even if heat is generated in association with the sintering. A sintered magnet comprises a crystal phase composed of a plurality of Sm—Fe—N-based crystal grains and a nonmagnetic metal phase present between the Sm—Fe—N crystal grains adjacent to each other, wherein a ratio of Fe peak intensity IFe to SmFeN peak intensity ISmFeN measured by an X-ray diffraction method is 0.2 or less. A magnetic powder comprises Sm—Fe—N-based crystal particles and a nonmagnetic metal layer covering surfaces of the Sm—Fe—N crystal particles.
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公开(公告)号：US20220362843A1
公开(公告)日：2022-11-17
申请号：US17815792
申请日：2022-07-28
申请人： NICHIA CORPORATION
发明人： Satoshi YAMANAKA , Takayuki YANO
摘要： Included is a method of preparing a compound for bonded magnets, the method including: coating a magnetic material having an average particle size of 10 μm or less with a thermosetting resin and a curing agent at a ratio of the equivalent weight of the curing agent to the equivalent weight of the thermosetting resin of 2 or higher and 10 or lower to obtain a coated material; granulating the coated material by compression to obtain a granulated product; milling the granulated product to obtain a milled product; and surface treating the milled product with a silane coupling agent to obtain a compound for bonded magnets, the method either including, between the granulation and the milling, heat curing the granulated product to obtain a cured product, or including, between the milling and the surface treatment, heat curing the milled product to obtain a cured product.
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公开(公告)号：US20220351882A1
公开(公告)日：2022-11-03
申请号：US17812715
申请日：2022-07-14
申请人： NICHIA CORPORATION
摘要： Provided are a SmFeN magnetic powder which is superior not only in water resistance and corrosion resistance but also in hot water resistance, and a method of preparing the powder. The present invention relates to a method of preparing a magnetic powder, comprising: plasma-treating a gas; surface-treating a SmFeN magnetic powder with the plasma-treated gas; and forming a coat layer on the surface of the surface-treated SmFeN magnetic powder.
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公开(公告)号：US11476020B2
公开(公告)日：2022-10-18
申请号：US16013101
申请日：2018-06-20
摘要： To provide a rare earth magnet having excellent coercive force and a production method thereof. A rare earth magnet, wherein the rare earth magnet comprises a magnetic phase containing Sm, Fe, and N, a Zn phase present around the magnetic phase, and an intermediate phase present between the magnetic phase and the Zn phase, wherein the intermediate phase contains Zn and the oxygen content of the intermediate phase is higher than the oxygen content of the Zn phase; and a method for producing a rare earth magnet, including mixing a magnetic raw material powder having an oxygen content of 1.0 mass % or less and an improving agent powder containing metallic Zn and/or a Zn alloy, and heat-treating the mixed powder.
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