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Patent Agency Ranking
公开(公告)号：US20210375514A1
公开(公告)日：2021-12-02
申请号：US17331531
申请日：2021-05-26
Applicant: GRIREM HI-TECH CO., LTD. , GRIREM ADVANCED MATERIALS CO.,LTD. , Grirem (Rongcheng) Co., Ltd.
Inventor： Yang LUO , Yuanfei YANG , Zilong WANG , Dunbo YU , Hongbin ZHANG , Jiajun XIE , Zhou HU , Zhongkai WANG
Abstract: 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.
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公开(公告)号：US20210375512A1
公开(公告)日：2021-12-02
申请号：US17331544
申请日：2021-05-26
Applicant: GRIREM HI-TECH CO., LTD. , GRIREM ADVANCED MATERIALS CO.,LTD. , Grirem (Rongcheng) Co., Ltd.
Inventor： Yang LUO , Yuanfei YANG , Zilong WANG , Dunbo YU , Jiajun XIE , Kaiwen WU , Yifan LIAO , Jichen JIA
Abstract: 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.
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公开(公告)号：US20210407713A1
公开(公告)日：2021-12-30
申请号：US17331555
申请日：2021-05-26
Applicant: GRIREM ADVANCED MATERIALS CO., LTD. , GRIREM HI-TECH CO., LTD. , GRIREM (RONGCHENG) CO., LTD.
Inventor： Yang LUO , Wei ZHU , Dunbo YU , Zilong WANG , Hongbin ZHANG , Xinyuan BAI , Xiao LIN , Haijun PENG , Jiajun XIE
Abstract: 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. A wider and longer diffusion channel formed by a low-melting-point alloy containing Pr preferentially entering the inside of the magnet is used as a channel for rapid diffusion of a heavy rare earth element
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公开(公告)号：US20210129217A1
公开(公告)日：2021-05-06
申请号：US17090703
申请日：2020-11-05
Inventor： Yang LUO , Zilong WANG , Yuanfei Yang , Zhou HU , Dunbo Yu , Jiajun XIE , Yifan LIAO , Zhongkai WANG
Abstract: 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.
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公开(公告)号：US20200263280A1
公开(公告)日：2020-08-20
申请号：US16791088
申请日：2020-02-14
Applicant: GRIREM ADVANCED MATERIALS CO., LTD.
Inventor： Yang LUO , Xiao LIN , Guiyong WU , Jiajun XIE , Zilong WANG , Wenlong YAN , Zhongkai WANG , Dunbo YU
Abstract: 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.
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