Patents by Inventor Dunbo Yu
Dunbo Yu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11802326Abstract: An anisotropic bonded magnet and a preparation method thereof are provided. By stacking magnets having different magnetic properties and/or densities, the magnets in the middle have high properties and the magnets at two ends and/or the periphery have low properties, thereby compensating for a property deviation caused by a difference in pressing densities during a pressing process, and improving the property uniformity of the magnets in an axial direction. The method solves the problem of “low in the middle and high at two ends” caused by the phenomenon of non-uniform magnetic field orientation and density along a height direction during orientation and densification.Type: GrantFiled: May 26, 2021Date of Patent: October 31, 2023Assignees: GRIREM HI-TECH CO., LTD., GRIREM ADVANCED MATERIALS CO., LTD., Grirem (Rongcheng) Co., Ltd.Inventors: Yang Luo, Yuanfei Yang, Zilong Wang, Dunbo Yu, Hongbin Zhang, Jiajun Xie, Zhou Hu, Zhongkai Wang
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Patent number: 11705257Abstract: The present invention relates to an R-T-B sintered magnet and a preparation method thereof. The sintered magnet includes a grain boundary region T1, a shell layer region T2 and an R2Fe14B grain region T3; at 10 ?m to 60 ?m from a surface of the sintered magnet toward a center thereof, an area ratio of the shell layer region T2 to the R2Fe14B grain region T3 is 0.1 to 0.3, and a thickness of the shell layer region T2 is 0.5 ?m to 1.2 ?m; and an average coating percent of the shell layer region T2 on the R2Fe14B grain region T3 is 80% or more. In the present invention, by optimizing a preparation process and a microstructure of a traditional rare earth permanent magnet, diffusion efficiency of heavy rare earth in the magnet is improved, such that coercivity of the magnet is greatly improved, and manufacturing cost is reduced.Type: GrantFiled: April 29, 2021Date of Patent: July 18, 2023Assignees: GRIREM ADVANCED MATERIALS CO., LTD., Rare Earth Functional Materials (Xiong'an) Innovation Center Co., Ltd., Griceon (Rongcheng) Co., Ltd.Inventors: Yang Luo, Dunbo Yu, Wei Zhu, Xinyuan Bai, Xiao Lin, Shengjie Zhu, Zilong Wang, Haijun Peng
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Patent number: 11505852Abstract: The present disclosure discloses an yttrium (Y)-added rare-earth permanent magnetic material and a preparation method thereof. A chemical formula of the material expressed in atomic percentage is (YxRE1-x)aFebalMbNc, wherein 0.05?x?0.4, 7?a?13, 0?b?3, 5?c?20, and the balance is Fe, namely, bal=100-a-b-c; RE represents a rare-earth element Sm, or a combination of the rare-earth element Sm and any one or more elements of Zr, Nd and Pr; M represents Co and/or Nb; and N represents nitrogen. In the preparation method, the rare-earth element Y is utilized to replace the element Sm of a samarium-iron-nitrogen material. By regulating a ratio of the element Sm to the element Y, viscosity of an alloy liquid can be reduced, and an amorphous forming ability of the material is enhanced.Type: GrantFiled: February 14, 2020Date of Patent: November 22, 2022Assignee: GRIREM ADVANCED MATERIALS CO., LTD.Inventors: Yang Luo, Xiao Lin, Guiyong Wu, Jiajun Xie, Zilong Wang, Wenlong Yan, Zhongkai Wang, Dunbo Yu
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Patent number: 11495376Abstract: The present invention discloses rare earth-bonded magnetic powder and a preparation method therefor. The bonded magnetic powder is of a multilayer core-shell structure, and comprises a core layer and an antioxidant layer (3), wherein the core layer is formed by RFeMB, R is Nd and/or PrNd, and M is one or more of Co, Nb, and Zr; and the core layer is coated with an iron-nitrogen layer (2). In addition, the present invention also discloses the preparation method for the rare earth-bonded magnetic powder and a bonded magnet. The oxidation and corrosion of magnetic raw powder during phosphorization and subsequent treatment process are effectively prevented, thereby further improving the long-term temperature resistance and environmental tolerance of the material.Type: GrantFiled: June 20, 2018Date of Patent: November 8, 2022Assignees: GRIREM ADVANCED MATERIALS CO., LTD., GUOKE RE ADVANCED MATERIALS CO., LTD.Inventors: Yang Luo, Hongbin Zhang, Zhou Hu, Dunbo Yu, Ningtao Quan, Yuanfei Yang, Wenlong Yan, Jiajun Xie
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Publication number: 20210407713Abstract: The present invention relates to a modified sintered Nd—Fe—B magnet, and a preparation method and a use thereof. The modified sintered Nd—Fe—B magnet is prepared by performing grain boundary diffusion on a matrix, wherein the matrix is a sintered Nd—Fe—B magnet; a grain boundary diffusion source for the grain boundary diffusion consists of a first diffusion source and a second diffusion source; the first diffusion source is a PrMx alloy, M being at least one selected from a group consisted of Cu, Al, Zn, Mg, Ga, Sn, Ag, Pb, Bi, Ni, Nb, Mn, Co, Fe, Ti, Cr, Zr, Mo and Ge; and the second diffusion source is heavy rare earth Dy and/or Tb.Type: ApplicationFiled: May 26, 2021Publication date: December 30, 2021Inventors: Yang LUO, Wei ZHU, Dunbo YU, Zilong WANG, Hongbin ZHANG, Xinyuan BAI, Xiao LIN, Haijun PENG, Jiajun XIE
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Publication number: 20210375512Abstract: An anisotropic bonded magnet and a preparation method thereof are provided. Through a method of stacking magnets which are different in content of SmFeN and/or have different densities, the magnets in the middle have high properties and the magnets at two ends and/or the periphery have low properties, thereby compensating for a property deviation caused by a difference in densities during a pressing process, and improving the property uniformity of the magnets in an axial direction. The method avoids the phenomenon of non-uniform magnetic field orientation and density in a height direction during orientation and densification as well as the phenomenon of low in the middle and high at two ends.Type: ApplicationFiled: May 26, 2021Publication date: December 2, 2021Inventors: Yang LUO, Yuanfei YANG, Zilong WANG, Dunbo YU, Jiajun XIE, Kaiwen WU, Yifan LIAO, Jichen JIA
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Publication number: 20210375514Abstract: An anisotropic bonded magnet and a preparation method thereof are provided. By stacking magnets having different magnetic properties and/or densities, the magnets in the middle have high properties and the magnets at two ends and/or the periphery have low properties, thereby compensating for a property deviation caused by a difference in pressing densities during a pressing process, and improving the property uniformity of the magnets in an axial direction. The method solves the problem of “low in the middle and high at two ends” caused by the phenomenon of non-uniform magnetic field orientation and density along a height direction during orientation and densification.Type: ApplicationFiled: May 26, 2021Publication date: December 2, 2021Inventors: Yang LUO, Yuanfei YANG, Zilong WANG, Dunbo YU, Hongbin ZHANG, Jiajun XIE, Zhou HU, Zhongkai WANG
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Publication number: 20210343459Abstract: The present invention relates to an R-T-B sintered magnet and a preparation method thereof. The sintered magnet includes a grain boundary region T1, a shell layer region T2 and an R2Fe14B grain region T3; at 10 ?m to 60 ?m from a surface of the sintered magnet toward a center thereof, an area ratio of the shell layer region T2 to the R2Fe14B grain region T3 is 0.1 to 0.3, and a thickness of the shell layer region T2 is 0.5 ?m to 1.2 ?m; and an average coating percent of the shell layer region T2 on the R2Fe14B grain region T3 is 80% or more. In the present invention, by optimizing a preparation process and a microstructure of a traditional rare earth permanent magnet, diffusion efficiency of heavy rare earth in the magnet is improved, such that coercivity of the magnet is greatly improved, and manufacturing cost is reduced.Type: ApplicationFiled: April 29, 2021Publication date: November 4, 2021Inventors: Yang LUO, Dunbo YU, Wei ZHU, Xinyuan BAI, Xiao LIN, Shengjie ZHU, Zilong WANG, Haijun PENG
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Patent number: 11101057Abstract: Provided are a highly thermostable rare-earth permanent magnetic material, a preparation method thereof and a magnet containing the same. A composition of the rare-earth permanent magnetic material by an atomic percentage is as follows: SmxRaFe100-x-y-z-aMyNz, wherein R is at least one of Zr and Hf, M is at least one of Co, Ti, Nb, Cr, V, Mo, Si, Ga, Ni, Mn and Al, x+a is 7-10%, a is 0-1.5%, y is 0-5% and z is 10-14%.Type: GrantFiled: January 11, 2018Date of Patent: August 24, 2021Assignee: GRIREM ADVANCED MATERIALS CO., LTD.Inventors: Guiyong Wu, Yang Luo, Hongwei Li, Yuanfei Yang, Dunbo Yu, Ningtao Quan, Chao Yuan, Wenlong Yan
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Publication number: 20210156009Abstract: The present invention discloses an yttrium-added rare earth permanent magnet material and a preparation method therefor. The chemical formula of the material is expressed as (YxRe1-x)aFe100-a-b-cMbBc according to the mass percentage, wherein 0.05?x?0.5, 20?a?28, 0.5?b?2, 0.5?c?1.5, Re is Nd and/or Pr, and M is Al and/or Nb. According to the present invention, the relatively surplus and inexpensive rare earths yttrium and cerium are used to replace Nd and/or Pr in NdFeB. By controlling the ratio of the rare earth elements such as yttrium, cerium and neodymium, and adding an appropriate amount of Nb and/or Al element, the rare earth elements are used in a comprehensive and balanced manner while better magnetic properties are maintained.Type: ApplicationFiled: June 20, 2018Publication date: May 27, 2021Inventors: YANG LUO, DUNBO YU, JIAJUN XIE, CAOHUAN ZHANG, NINGTAO QUAN, YUANFEI YANG, HAIJUN PENG
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Publication number: 20210151226Abstract: The present invention discloses rare earth-bonded magnetic powder and a preparation method therefor. The bonded magnetic powder is of a multilayer core-shell structure, and comprises a core layer and an antioxidant layer (3), wherein the core layer is formed by RFeMB, R is Nd and/or PrNd, and M is one or more of Co, Nb, and Zr; and the core layer is coated with an iron-nitrogen layer (2). In addition, the present invention also discloses the preparation method for the rare earth-bonded magnetic powder and a bonded magnet. The oxidation and corrosion of magnetic raw powder during phosphorization and subsequent treatment process are effectively prevented, thereby further improving the long-term temperature resistance and environmental tolerance of the material.Type: ApplicationFiled: June 20, 2018Publication date: May 20, 2021Inventors: YANG LUO, HONGBIN ZHANG, ZHOU HU, DUNBO YU, NINGTAO QUAN, YUANFEI YANG, WENLONG YAN, JIAJUN XIE
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Publication number: 20210130939Abstract: The invention discloses an anisotropic bonded magnetic powder and a preparation method thereof. The anisotropic bonded magnetic powder has a general formula of R1R2TB, wherein R1 is a rare earth element containing Nd or PrNd, R2 is one or two of La and Ce, T is a transitional element, and B is boron. The preparation method includes the steps of smelting the master alloy to prepare ingot(s), preparing a rare earth hydride of formula R1TBHX, preparing a hydride diffusion source of formula R1R2THX, mixing, heat treating, and high-vacuum dehydrogenating, to obtain the anisotropic bonded magnetic powder. The invention uses La and Ce hydrides as the diffusion source, can save cost, remove hydrogen from the diffusion source at a lower dehydrogenation temperature, avoid crystal grain growth at a high temperature, and ensure the quality of the product.Type: ApplicationFiled: November 5, 2020Publication date: May 6, 2021Inventors: Yang Luo, Zhongkai Wang, Yuanfei Yang, Zilong Wang, Dunbo Yu, Yifan Liao, Jiajun Xie, Zhou Hu
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Publication number: 20210134499Abstract: The invention discloses a composite rare earth anisotropic bonded magnet and a preparation method thereof. The composite rare earth anisotropic bonded magnet comprises a Nd—Fe—B magnetic powder, a Sm—Fe—N magnetic powder, a binder and an inorganic nano-dispersant. The preparation method comprises steps of preparing a Nd—Fe—B magnetic powder by a HDDR method, preparing a Sm—Fe—N magnetic powder by a powder metallurgy method, mixing the Nd—Fe—B magnetic powder, the Sm—Fe—N magnetic powder, the binder and the inorganic nano-dispersant at a specific ratio to finally obtain the composite rare earth anisotropic bonded magnet. The invention, by adding an inorganic nano-dispersant, enables the full dispersion of the fine Sm—Fe—N powder during the mixing process of the binder, the Nd—Fe—B magnetic powder and the Sm—Fe—N powder, and thus makes the fine Sm—Fe—N powder and the binder evenly coated on the surface of the anisotropic Nd—Fe—B magnetic powder.Type: ApplicationFiled: November 5, 2020Publication date: May 6, 2021Inventors: Yang Luo, Zhongkai Wang, Yuanfei Yang, Zilong Wang, Dunbo Yu, Yifan Liao, Jiajun Xie, Zhou Hu
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Publication number: 20210129217Abstract: A method for preparing a rare earth anisotropic bonded magnetic powder, comprises the following steps: (1) preparing raw powder with RTBH as the main component, wherein, R is Nd or Pr/Nd, and T is a transition metal containing Fe; (2) adding La/Ce hydride and copper powder to the raw powder to form a mixture; (3) subjecting the mixture to atmosphere diffusion heat treatment to give the rare earth anisotropic bonded magnetic powder. The invention selects high-abundance rare earth elements La, Ce to replace Dy, Tb, Nd, Pr and other medium and heavy rare earth elements, which can achieve the same coercivity improvement effect while also significantly reducing the cost, thereby achieving efficient application of low-cost and high-abundance rare earths.Type: ApplicationFiled: November 5, 2020Publication date: May 6, 2021Inventors: Yang LUO, Zilong WANG, Yuanfei Yang, Zhou HU, Dunbo Yu, Jiajun XIE, Yifan LIAO, Zhongkai WANG
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Patent number: 10811175Abstract: An alloy material, a bonded magnet, and a modification method of a rare-earth permanent magnetic powder are provided by the present application. A melting point of the alloy material is lower than 600° C. and a composition of the alloy material by an atomic part is RE100-x-yMxNy, wherein RE is one or more of non-heavy rare-earth Nd, Pr, Sm, La and Ce, M is one or more of Cu, Al, Zn and Mg, N is one or more of Ga, In and Sn, x=10-35 and y=1-15.Type: GrantFiled: October 27, 2017Date of Patent: October 20, 2020Assignee: GRIREM ADVANCED MATERIALS CO., LTD.Inventors: Yang Luo, Chao Yuan, Kuo Men, Ningtao Quan, Hongbin Zhang, Wenlong Yan, Dunbo Yu, Yuanfei Yang
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Publication number: 20200263280Abstract: The present disclosure discloses an yttrium (Y)-added rare-earth permanent magnetic material and a preparation method thereof. A chemical formula of the material expressed in atomic percentage is (YxRE1-x)aFebalMbNc, wherein 0.05?x?0.4, 7?a?13, 0?b?3, 5?c?20, and the balance is Fe, namely, bal=100-a-b-c; RE represents a rare-earth element Sm, or a combination of the rare-earth element Sm and any one or more elements of Zr, Nd and Pr; M represents Co and/or Nb; and N represents nitrogen. In the preparation method, the rare-earth element Y is utilized to replace the element Sm of a samarium-iron-nitrogen material. By regulating a ratio of the element Sm to the element Y, viscosity of an alloy liquid can be reduced, and an amorphous forming ability of the material is enhanced.Type: ApplicationFiled: February 14, 2020Publication date: August 20, 2020Inventors: Yang LUO, Xiao LIN, Guiyong WU, Jiajun XIE, Zilong WANG, Wenlong YAN, Zhongkai WANG, Dunbo YU
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Publication number: 20180268971Abstract: Provided are a highly thermostable rare-earth permanent magnetic material, a preparation method thereof and a magnet containing the same. A composition of the rare-earth permanent magnetic material by an atomic percentage is as follows: SMxRaFe100-x-y-z-aMyNz, wherein R is at least one of Zr and Hf, M is at least one of Co, Ti, Nb, Cr, V, Mo, Si, Ga, Ni, Mn and Al, x+a is 7-10%, a is 0-1.5%, y is 0-5% and z is 10-14%.Type: ApplicationFiled: January 11, 2018Publication date: September 20, 2018Inventors: Guiyong Wu, Yang Luo, Hongwei Li, Yuanfei Yang, Dunbo Yu, Ningtao Quan, Chao Yuan, Wenlong Yan
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Patent number: 10079085Abstract: A rare-earth permanent magnetic powder, a bonded magnet containing thereof and a device using the bonded magnet are provided of the present disclosure. The rare-earth permanent magnetic powder comprises: 70 vol % to 99 vol % of a hard magnetic phase and 1 vol % to 30 vol % of a soft magnetic phase, the hard magnetic phase has a TbCu7 structure, and the grain size of the hard magnetic phase is 5 nm to 100 nm; the soft magnetic phase is a Fe phase having a bcc structure, the average grain size of the soft magnetic phase is 1 nm to 30 nm, and the standard deviation of the grain size is below 0.5?.Type: GrantFiled: May 31, 2013Date of Patent: September 18, 2018Assignees: GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS, GRIREM ADVANCED MATERIALS CO., LTD.Inventors: Hongwei Li, Yang Luo, Dunbo Yu, Kuoshe Li, Wenlong Yan, Shipeng Li, Yongqiang Yuan, Haijun Peng
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Publication number: 20180182517Abstract: An alloy material, a bonded magnet, and a modification method of a rare-earth permanent magnetic powder are provided by the present application. A melting point of the alloy material is lower than 600° C. and a composition of the alloy material by an atomic part is RE100-x-yMxNy, wherein RE is one or more of non-heavy rare-earth Nd, Pr, Sm, La and Ce, M is one or more of Cu, Al, Zn and Mg, N is one or more of Ga, In and Sn, x=10-35 and y=1-15.Type: ApplicationFiled: October 27, 2017Publication date: June 28, 2018Inventors: Yang Luo, Chao Yuan, Kuo Men, Ningtao Quan, Hongbin Zhang, Wenlong Yan, Dunbo Yu, Yuanfei Yang
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Patent number: 9859042Abstract: The application discloses a rare-earth permanent magnetic powder, a bonded magnet, and a device using the bonded magnet. The rare-earth permanent magnetic powder comprises 4 to 12 at. % of Nd, 0.1 to 2 at. % of C, 10 to 25 at. % of N and 62.2 to 85.9 at. % of T, wherein T is Fe or FeCo and the main phase of the rare-earth permanent magnetic powder is a hard magnetic phase with a TbCu7 structure. Material volatilization can be avoided effectively during a preparation process of the rare earth permanent magnetic powder, thus improving the wettability with a water-cooling roller during the preparation process and final prepared materials are provided with good magnetic properties.Type: GrantFiled: July 2, 2012Date of Patent: January 2, 2018Assignee: GRIREM ADVANCED MATERIALS CO., LTD.Inventors: Yang Luo, Hongwei Li, Dunbo Yu, Kuoshe Li, Wenlong Yan, Jiajun Xie, Shuai Lu