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公开(公告)号：US20240191049A1
公开(公告)日：2024-06-13
申请号：US18553557
申请日：2022-03-31
发明人： Zhiqiang LI , Mingliang GAO , Yongjiang YU , Hongyu ZHOU , Bin ZHOU , Pengfei WANG , Rui WEI
CPC分类号： C08J9/0085 , C08J9/32 , C08K7/10 , C09D7/61 , C09D7/65 , C09D7/69 , C09D7/70 , C09D133/14 , C08J2203/22 , C08J2333/14 , C08J2475/04 , C08K2201/011
摘要： A composition of heat-expandable microspheres and an application thereof are provided. The composition includes heat-expandable microspheres and a solvent. The particle size of the heat-expandable microspheres is 5 μm≤D≤40 μm, preferably 8 μm≤D≤20 μm. The thickness of the walls of at least 60% of the heat-expandable microspheres is ≤5 μm, preferably the thickness is ≤3 μm. The solvent at least comprises one organic solvent having a boiling point of above 220° C. A thermal expansion coating containing the composition has a stable structure, relatively high resistance to thermal shrinkage, relatively high mechanical strength and adhesion, can be applied in the fixation of high temperature resistant parts, and can maintain the bonding stability thereof when placed long-term in a high temperature environment (140-180° C.).
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公开(公告)号：US20180061568A1
公开(公告)日：2018-03-01
申请号：US15690268
申请日：2017-08-29
发明人： Yongjiang YU , Xiuyan SUN , Nan ZHAO , Xiaodong TIAN
摘要： A method for producing a sintered R-iron (Fe)-boron (B) magnet, the method including: (1) producing a sintered magnet R1-Fe—B-M, where R1 is neodymium (Nd), praseodymium (Pr), terbium (Tb), dysprosium (Dy), gadolinium (Gd), holmium (Ho), or a combination thereof; M is titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), cobalt (Co), nickel (Ni), gallium (Ga), calcium (Ca), copper (Cu), Zinc (Zn), silicon (Si), aluminum (Al), magnesium (Mg), zirconium (Zr), niobium (Nb), hafnium (Hf), tantalum (Ta), tungsten (W), molybdenum (Mo), or a combination thereof; (2) removing oil, washing using an acid solution, activating, and washing using deionized water the sintered magnet, successively; (3) mixing a superfine terbium powder, an organic solvent, and an antioxidant to yield a homogeneous slurry, coating the homogeneous slurry on the surface of the sintered magnet; and (4) sintering and aging the sintered magnet.
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3.发明公开公开(公告)号：US20240274333A1
公开(公告)日：2024-08-15
申请号：US18568831
申请日：2022-06-13
发明人： Bingqiang SHI , Zhongxin AN , Chubo DENG , Lei LIU , Yanmei JIN
IPC分类号： H01F1/057 , B22F3/16 , B22F3/24 , B22F9/02 , B22F9/04 , C22C33/02 , C22C35/00 , C22C38/00 , C22C38/06 , C22C38/14 , C22C38/16 , H01F41/02
CPC分类号： H01F1/0577 , B22F3/16 , B22F3/24 , B22F9/023 , B22F9/04 , C22C33/0207 , C22C33/0278 , C22C35/005 , C22C38/002 , C22C38/005 , C22C38/06 , C22C38/14 , C22C38/16 , H01F41/0266 , H01F41/0293 , B22F2003/248 , B22F2009/044 , B22F2201/20 , B22F2202/05 , B22F2301/355 , B22F2304/10 , B22F2998/10 , B22F2999/00 , C22C2202/02
摘要： A low-cost high-coercivity LaCe-rich neodymium-iron-boron permanent magnet, and a preparation method therefor and the use thereof are provided. The permanent magnet is prepared by mixing and sintering an LaCe-free and HRE-free neodymium-iron-boron main phase alloy and an LaCe-M alloy. An LaCe-free main phase alloy and an LaCe-M auxiliary phase alloy are respectively smelted at first, and then, the same are subjected to powder preparation, mixing, pressing, and sintering, thereby avoiding LaCe entering main phase crystal grains. The depth and concentration of HRE diffused into the magnet are effectively improved by using the characteristics of a low melting point and high flowability of an LaCe-rich crystal boundary phase, thereby improving the uniformity of components and structure distribution in the magnet.
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公开(公告)号：US20240034892A1
公开(公告)日：2024-02-01
申请号：US18553611
申请日：2022-03-31
发明人： Zhiqiang LI , Mingliang GAO , Yongjiang YU , Hongyu ZHOU , Bin ZHOU , Pengfei WANG , Yunting SU
IPC分类号： C09D7/65 , C09D7/40 , C09D7/63 , C09D7/61 , C09D163/00 , C09D167/00 , C09D133/04
CPC分类号： C09D7/65 , C09D7/70 , C09D7/69 , C09D7/63 , C09D7/61 , C09D163/00 , C09D167/00 , C09D133/04
摘要： Disclosed are a coating composition, a preparation method therefor and use thereof. The coating composition comprises a composition of at least 60% heat-expandable microspheres having a wall thickness of less than or equal to 5 μm, a water-based thermoplastic resin, a water-based thermosetting resin, and a hot-melt filling resin. By means of the coating composition of the present invention, thin-shell spheres can be quickly softened and destroyed within a short time in the heat-expansion process, and with the volatilization of an organic solvent, the coating composition cross-links, on the surface and inside of the coating, with a resin matrix in the coating to form a cross-linked network structure, thus strengthening the gap support of the coating, and enabling the coating to achieve stepped expansion, and after expansion, some polymer materials wrap an airbag and harden to form a stable hollow structure. Therefore, the expanded coating has a stable structure, high thermal shrinkage resistance, high mechanical strength and adhesive force, can be used for the fixation of high temperature-resistant parts, and can maintain adhesive stability when placed in a high-temperature environment (140-180° C.) for a long time.
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公开(公告)号：US10748706B2
公开(公告)日：2020-08-18
申请号：US15690268
申请日：2017-08-29
发明人： Yongjiang Yu , Xiuyan Sun , Nan Zhao , Xiaodong Tian
IPC分类号： H01F41/02 , C22C38/00 , C22C38/06 , C22C38/10 , C22C38/14 , C22C38/16 , H01F1/057 , C22C38/02 , C22C38/18 , C22C38/12 , C22C38/08 , C22C38/04 , H01F1/08 , B22F3/24 , B22F1/00 , B22F9/04
摘要： A method for producing a sintered R-iron (Fe)-boron (B) magnet, the method including: (1) producing a sintered magnet R1-Fe—B-M, where R1 is neodymium (Nd), praseodymium (Pr), terbium (Tb), dysprosium (Dy), gadolinium (Gd), holmium (Ho), or a combination thereof; M is titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), cobalt (Co), nickel (Ni), gallium (Ga), calcium (Ca), copper (Cu), Zinc (Zn), silicon (Si), aluminum (Al), magnesium (Mg), zirconium (Zr), niobium (Nb), hafnium (Hf), tantalum (Ta), tungsten (W), molybdenum (Mo), or a combination thereof; (2) removing oil, washing using an acid solution, activating, and washing using deionized water the sintered magnet, successively; (3) mixing a superfine terbium powder, an organic solvent, and an antioxidant to yield a homogeneous slurry, coating the homogeneous slurry on the surface of the sintered magnet; and (4) sintering and aging the sintered magnet.
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公开(公告)号：US09901984B2
公开(公告)日：2018-02-27
申请号：US14187197
申请日：2014-02-21
发明人： Qingkai Wang , Dongdong Li , Buzhuang Peng , Meizhu Shao , Rui Wei
CPC分类号： B22F3/24 , B22F2003/248 , H01F1/0572
摘要： A method for preparing an R—Fe—B based sintered magnet. The method includes: 1) preparing a R1—Fe—B-M alloy, pulverizing the R1—Fe—B-M alloy to yield a R1—Fe—B-M alloy powder, adding a heavy rare earth powder of R2 or R2X and subsequently adding a lubricant to the R1—Fe—B-M alloy powder and uniformly stirring to form a mixture, where R1 being Nd, Pr, Tb, Dy, La, Gd, Ho, or a mixture thereof; M being Ti, V, Cr, Mn, Co, Ga, Cu, Si, Al, Zr, Nb, W, Mo, or a mixture thereof; R2 being at least one from Tb, Dy, and Ho; X being at least one from O, F, and Cl; 2) pressing the mixture obtained in step 1) to form a compact, and sintering the compact in a pressure sintering device in vacuum or in an inactive gas atmosphere to obtain a magnet; and 3) aging the magnet obtained in step 2).
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公开(公告)号：US09623482B2
公开(公告)日：2017-04-18
申请号：US14187190
申请日：2014-02-21
发明人： Yongjiang Yu , Xiuyan Sun , Zhiqiang Li , Yulin Wang , Lei Liu
IPC分类号： B22F3/26 , H01F1/057 , H01F41/02 , C22C38/00 , C22C38/06 , C22C38/10 , C22C38/14 , C22C38/16 , C22C33/02
CPC分类号： B22F3/26 , B22F2998/10 , B22F2999/00 , C22C33/0278 , C22C38/002 , C22C38/005 , C22C38/06 , C22C38/10 , C22C38/14 , C22C38/16 , C22C2202/02 , H01F1/0577 , H01F41/0293 , B22F3/10 , B22F2201/20 , B22F2003/242 , B22F2003/248
摘要： A method for preparing an R—Fe—B based sintered magnet, including: preparing a R1—Fe—B-M sintered magnet having a thickness of between 1 and 10 mm; spraying a layer of Tb or Dy having a thickness of between 10 and 200 μm on each surface of the sintered magnet in a sealed box under an Ar atmosphere by hot spraying method; and transferring the sintered magnet coated with the layer of Tb or Dy to a vacuum sintering furnace, heating the sintered magnet at the temperature of between 750 and 1000° C. in a vacuum condition or under the Ar atmosphere, and allowing heavy rare earth element Tb or Dy to enter an inner part of the sintered magnet via grain boundary diffusion.
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8.发明公开公开(公告)号：US20240212897A1
公开(公告)日：2024-06-27
申请号：US18395407
申请日：2023-12-22
发明人： Zhiqiang LI , Lei LIU , Meng XUE , Yunying JIANG , Meng LI
CPC分类号： H01F1/0577 , H01F7/02
摘要： A permanent magnet material having the multilayer structure can obtain a high-performance permanent magnet material under the condition of a reduced content of Nd. By means of powder preparation, mixing, pressing, and sintering, the performance defect such as the reduction of the magnet property caused by CeY entering the main phase grains is effectively avoided, and the influence of the formation of a CeFe2 phase in the grain boundaries on the magnet property is also avoided. Moreover, by the introduction of M, the inhibition of CeY enrichment in the grain boundaries on the diffusion effect is avoided, a diffusion channel of heavy rare earth from the surface of the magnet to the interior is provided, and thus the diffusion effect is optimized, and the diffusion performance is significantly improved.
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9.发明公开公开(公告)号：US20240101836A1
公开(公告)日：2024-03-28
申请号：US18474942
申请日：2023-09-26
发明人： Zhiqiang LI , Wen LI , Pengfei WANG , Bin ZHOU , Yunting SU
摘要： The present disclosure provides an expanded coating, a preparation method and use thereof, and a permanent magnet comprising same. The expanded coating described herein comprises pores and a filler resin arranged among the pores; the pores comprise at least a spheroid pore having a cross section with a long diameter and a short diameter; in the cross section of the expanded coating, the area of the spheroid pores accounts for 50%-60% of the cross-sectional area of the expanded coating. The permanent magnet of the present disclosure comprises the expanded coating. The expanded coating has high strength and can exhibit excellent mechanical properties and corrosion resistance at high temperatures (such as 170° C.), with a shear strength greater than 2 MPa, a tensile strength greater than 2 MPa, an oil resistance greater than 1800 h and a neutral salt spray performance greater than 288 h at 170° C.
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公开(公告)号：US20230207165A1
公开(公告)日：2023-06-29
申请号：US17999989
申请日：2021-05-24
发明人： Bingqiang SHI , Lei LIU , Dan MA , Yunting SU
CPC分类号： H01F1/057 , H01F41/0293 , H01F7/021 , H01F38/00
摘要： A neodymium-iron-boron (NdFeB) magnet is represented by a chemical formula R1-R2-Fe-M-B, and has a composite structure of a high-coercivity region and a high-remanence region. In the formula R1 is a rare earth element comprising at least Nd, R2 is a heavy rare earth element comprising at least Dy and/or Tb, and M is a transition metal element comprising at least Co. The neodymium-iron-boron magnet can greatly improve resistance to high-temperature demagnetization and inhibit reduction of magnetic flux of a magnet by adopting a small amount of Dy/Tb. The magnet can be used in an embedded high-speed motor. The preparing method for the magnet improves the material utilization and the production efficiency, and is feasible for a large-scale production.
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