Patents Examined by Xiaowei Su
  • Patent number: 10978228
    Abstract: Provided is a new magnetic material with high magnetic stability, as well as a manufacturing method therefor, said magnetic material having a higher saturation magnetization than ferrite-based magnetic materials, and having a higher electrical resistivity than existing metal-based magnetic materials, thus solving problems such as that of eddy current loss. Ti-ferrite nanoparticles obtained through wet synthesis are reduced within hydrogen, and grains are allowed to grow while simultaneously using a phase separation phenomenon due to a disproportionation reaction to produce a magnetic material powder in which an ?-(Fe, Ti) phase and a Ti-enriched phase are nano-dispersed. This powder is then sintered to produce a solid magnetic material.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: April 13, 2021
    Assignee: National Institute of Advanced Industrial Science and Technology
    Inventors: Nobuyoshi Imaoka, Kimihiro Ozaki
  • Patent number: 10978226
    Abstract: A sintered Nd—Fe—B magnet comprising at least one light rare earth element having a weight content between 31 wt. % and 35 wt. %, at least one heavy rare earth element having a weight content of no more than 0.2 wt. %, B having a weight content between 0.95 wt. % and 1.2 wt. %, at least one additive including Ti and having a weight content between 1.31 wt. % and 7.2 wt. %, Fe as a balance, and impurities including C, O, and N. Ti has a weight content between 0.3 wt. % and 1 wt. % and forms a Titanium-Iron-Boron phase with Fe and Boron B and being present in the sintered Nd—Fe—B magnet between 0.86 vol. % and 2.85 vol. %. The C, O, and N satisfy 630 ppm?1.2C+0.6O+N?3680 ppm. The sintered Nd—Fe—B magnet has a squareness factor of at least 0.95.
    Type: Grant
    Filed: May 5, 2017
    Date of Patent: April 13, 2021
    Assignee: YANTAI SHOUGANG MAGNETIC MATERIALS INC.
    Inventors: Kaihong Ding, Zhongjie Peng, Guohai Wang, Xiulei Chen
  • Patent number: 10978227
    Abstract: An alloy is provided which consists of Fe100?a?b?c?d?x?y?zCuaNbbMc TdSixByZz and up to 1 at % impurities, M being one or more of the elements Mo, Ta and Zr, T being one or more of the elements V, Mn, Cr, Co and Ni, Z being one or more of the elements C, P and Ge, 0 at %?a<1.5 at %, 0 at %?b<2 at %, 0 at %?(b+c)<2 at %, 0 at %?d<5 at %, 10 at %<x<18 at %, 5 at %<y<11 at % and 0 at %?z<2 at %. The alloy is configured in tape form and has a nanocrystalline structure in which at least 50 vol % of the grains have an average size of less than 100 nm, a hysteresis loop with a central linear region, a remanence ratio Jr/Js of <0.1 and a coercive field strength Hc to anisotropic field strength Ha ratio of <10%.
    Type: Grant
    Filed: July 22, 2016
    Date of Patent: April 13, 2021
    Assignee: Vacuumschmelze GmbH & Co. KG
    Inventors: Giselher Herzer, Christian Polak, Viktoria Budinsky
  • Patent number: 10971289
    Abstract: Disclosed in the present invention is a composite R—Fe—B based rare-earth sintered magnet comprising Pr and W, wherein the rare-earth sintered magnet comprises an R2Fe14B type main phase, and R is a rare-earth element comprising at least Pr, wherein the raw material components therein comprise more than or equal to 2 wt % of Pr and 0.0005 wt %-0.03 wt % of W; and the rare-earth sintered magnet is made through a process comprising the following steps: preparing molten liquid of the raw material components into a rapidly quenched alloy; grinding the rapidly quenched alloy into fine powder; obtaining a shaped body from the fine powder by using a magnetic field; and sintering the shaped body. By adding a trace amount of W into the rare-earth sintered magnet, the heat resistance and thermal demagnetization performance of the Pr-containing magnet are improved.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: April 6, 2021
    Assignees: XIAMEN TUNGSTEN CO., LTD., Fujian Changting Golden Dragon Rare-Earth Co., Ltd
    Inventor: Hiroshi Nagata
  • Patent number: 10964463
    Abstract: Provided is an alloy for R-T-B based rare earth magnet. “R” is one or more of a rare earth element, ‘T’ is one or more of a transition metal element essentially including Fe or Fe and Co, and “B” is boron. The alloy includes a single or a plural number of main phase (A), having a minimum length of 10 ?m or more and a maximum length of 30 ?m or more and 300 ?m or less, in a cross section cut along a thickness direction of the alloy. The main phase (A) includes an R2T14B phase, and an area ratio of the main phase (A) to an entire cross section is 2% or more and 60% or less.
    Type: Grant
    Filed: March 27, 2018
    Date of Patent: March 30, 2021
    Assignee: TDK CORPORATION
    Inventors: Takuma Hayakawa, Makoto Iwasaki, Tetsuya Hidaka, Eiji Kato, Hidetake Kitaoka
  • Patent number: 10951074
    Abstract: A permanent magnet is expressed by a composition formula: RpFeqMrCutCo100-p-q-r-t. The magnet comprises a metal structure including a main phase having a Th2Zn17 crystal phase and a grain boundary phase. The main phase includes a cell phase having the Th2Zn17 crystal phase and a Cu-rich phase. A section including a c-axis of the Th2Zn17 crystal phase has a first region in the crystal grain and a second region in the crystal grain, the first region is provided in the cell phase divided by the Cu-rich phase, the second region is provided within a range of not less than 50 nm nor more than 200 nm from the grain boundary phase in a direction perpendicular to an extension direction of the grain boundary phase, and a difference between a Cu concentration of the first region and a Cu concentration of the second region is 0.5 atomic percent or less.
    Type: Grant
    Filed: February 21, 2017
    Date of Patent: March 16, 2021
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yosuke Horiuchi, Shinya Sakurada, Masaya Hagiwara, Tadahiko Kobayashi, Toshihide Takahashi
  • Patent number: 10944339
    Abstract: The invention includes miniature dots, miniature disks or miniature cylinders and methods of making the same by dispersing a particle in or on a dissolvable, meltable or etchable layer on a substrate, a portion of the particle exposed above a surface of the dissolvable, meltable or etchable layer; depositing a mask on the particles and the dissolvable substrate; removing the particles from the layer; etching an array of nanoholes in the substrate; depositing one or more metallic layers into the nanoholes to form an array of dots, disks or cylinders; and dissolving the dissolvable layer with a solvent to expose the dots, disks or cylinders. The dots, disks or cylinders can be included with two sets of microelectrodes for ultrahigh speed rotation of miniature motors, and/or can be designed with a magnetic configuration into miniature motors for uniform rotation speeds and prescribed angular displacement.
    Type: Grant
    Filed: September 9, 2015
    Date of Patent: March 9, 2021
    Assignee: BOARD OF REGENTS, THE UNIVERSITY OF TEXAS SYSTEM
    Inventors: Donglei Fan, Kwanoh Kim, Jianhe Guo
  • Patent number: 10941458
    Abstract: In the production of a non-oriented electrical stress sheet by hot rolling a slab having a chemical composition comprising, by mass %, C: not more than 0.005, Si: 1.5-6.0, Mn: 0.05-2.0 and P: 0.03-0.15, subjecting to a hot band annealing, if necessary, cold rolling, finish annealing, and forming an insulation coating, the cooling from 700° C. to 500° C. in the finish annealing is conducted in an oxidizing atmosphere with an oxygen potential PH2O/PH2 of not less than 0.001 for 1-300 seconds, whereby P is segregated into the surface of the steel sheet after the finish annealing to obtain a non-oriented electrical steel sheet enhancing a crystal grain growth properties in the stress relief annealing.
    Type: Grant
    Filed: January 7, 2016
    Date of Patent: March 9, 2021
    Assignee: JFE STEEL CORPORATION
    Inventors: Hiroaki Nakajima, Tomoyuki Okubo, Tadashi Nakanishi, Yoshihiko Oda
  • Patent number: 10943716
    Abstract: A high-performance permanent magnet is provided. A permanent magnet expressed by a composition formula: (R1-xAx)pFeqMrCutCo100-p-r-t. The magnet comprises a metal structure including a plurality of crystal grains which constitutes a main phase having a Th2Zn17 crystal phase, An Fe concentration of each of the crystal grains is 28 atomic % or more. A concentration difference of the element A among the crystal grains is not less than 0.2 atomic % nor more than 3.0 atomic %.
    Type: Grant
    Filed: August 25, 2017
    Date of Patent: March 9, 2021
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yosuke Horiuchi, Shinya Sakurada, Naoyuki Sanada
  • Patent number: 10943717
    Abstract: An R-T-B based permanent magnet includes main phase grains composed of R2T14B type compound. R is a rare earth element. T is iron group element(s) essentially including Fe or Fe and Co. B is boron. An average grain size of the main phase grains is 0.8 ?m or more and 2.8 ?m or less. The R-T-B based permanent magnet contains at least C and Zr in addition to R, T, and B. B is contained at 0.75 mass % or more and 0.88 mass % or less. Zr is contained at 0.65 mass % or more and 5.00 mass % or less. A formula (1) of 5.0?[B]+[C]?[Zr]?5.6 is satisfied, where [B] is a B content represented by atom %, [C] is a C content represented by atom %, and [Zr] is a Zr content represented by atom %.
    Type: Grant
    Filed: February 23, 2017
    Date of Patent: March 9, 2021
    Assignee: TDK CORPORATION
    Inventors: Masashi Miwa, Takurou Iwasa
  • Patent number: 10930417
    Abstract: Interstitially modified compounds of rare earth element-containing, iron-rich compounds may be synthesized with a ThMn12 tetragonal crystal structure such that the compounds have useful permanent magnet properties. It is difficult to consolidate particles of the compounds into a bulk shape without altering the composition and magnetic properties of the metastable material. A combination of thermal analysis and crystal structure analysis of each compound may be used to establish heating and consolidation parameters for sintering of the particles into useful magnet shapes.
    Type: Grant
    Filed: July 19, 2018
    Date of Patent: February 23, 2021
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS
    Inventors: Chen Zhou, Frederick E. Pinkerton
  • Patent number: 10923256
    Abstract: To provide an R-T-B based sintered magnet including R: 27.5 to 34.0% by mass, RH: 2 to 10% by mass, B: 0.89 to 0.95% by mass, Ti: 0.1 to 0.2% by mass, Ga: 0.3 to 0.7% by mass, Cu: 0.07 to 0.50% by mass, Al: 0.05 to 0.50% by mass, M (M is Nb and/or Zr): 0 to 0.3% by mass, balance T, and inevitable impurities, the following inequality expressions (1), (2), and (3) being satisfied: [T]?72.3([B]?0.45[Ti])>0??(1) ([T]?72.3([B]?0.45[Ti]))/55.85<13[Ga]/69.72??(2) [Ga]?[Cu]??(3).
    Type: Grant
    Filed: June 17, 2016
    Date of Patent: February 16, 2021
    Assignee: HITACHI METALS, LTD.
    Inventors: Teppei Satoh, Futoshi Kuniyoshi, Rintaro Ishii, Takeshi Nishiuchi, Noriyuki Nozawa
  • Patent number: 10923254
    Abstract: A permanent magnet expressed by a composition formula: RpFeqMrCutCo100-p-q-r-t. The magnet comprises a metallic structure including crystal grains which constitutes a main phase having a Th2Zn17 crystal phase. An average value of Fe concentrations in the crystal grains of 20 or more is 28 atomic percent or more and an average value of R element concentrations in the crystal grains of 20 or more is 10 atomic percent or more.
    Type: Grant
    Filed: January 24, 2017
    Date of Patent: February 16, 2021
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yosuke Horiuchi, Shinya Sakurada, Masaya Hagiwara, Tsuyoshi Kobayashi, Tadahiko Kobayashi
  • Patent number: 10913992
    Abstract: Provided is a method of manufacturing a crystalline aluminum-iron-silicon alloy, and optionally an automotive component comprising the same, comprising forming a composite ingot including a plurality of crystalline phases by melting aluminum, iron, and silicon raw materials in an inert environment to form a substantially homogenous melt, subsequently solidifying the melt, and annealing the ingot under vacuum by heating at a temperature in the range of 850° C. to 1000° C. yield an annealed crystalline ingot wherein the predominant crystalline phase is FCC Al3Fe2Si. The raw materials can further include one or more additives such as zinc, zirconium, tin, and chromium. Melting can occur above the FCC Al3Fe2Si crystalline phase melting point, or at a temperature of about 1100° C. to about 1400° C. Annealing can occur under vacuum conditions.
    Type: Grant
    Filed: May 21, 2018
    Date of Patent: February 9, 2021
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Zhongyi Liu, Tengjiao Qi, James R. Salvador, Ratandeep S. Kukreja
  • Patent number: 10916373
    Abstract: A sintered R-T-B based magnet composition includes: R: not less than 27 mass % and not more than 37 mass % (R is at least one rare-earth element which always includes at least one of Nd and Pr), B: not less than 0.75 mass % and not more than 0.97 mass %, Ga: not less than 0.1 mass % and not more than 1.0 mass %, Cu: not less than 0 mass % and not more than 1.0 mass %, and T: 61.03 mass % or more (where T is at least one selected from Fe, Co, Al, Mn and Si and always includes Fe, such that the Fe content is 80 mass % or more in the entire T). [T]/[B] is greater than 14.0. An R amount is greater in the surface than in the center, and a Ga amount is greater in the surface than in the center. [T]/[B] in the surface is higher than [T]/[B] in the center.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: February 9, 2021
    Assignee: HITACHI METALS, LTD.
    Inventors: Noriyuki Nozawa, Yasutaka Shigemoto, Takeshi Nishiuchi
  • Patent number: 10900106
    Abstract: Disclosed herein is a ferritic steel having decreased specific gravity and having excellent mechanical strength by suppressing formation of ?-carbide. The ferrite steel may include: carbon (C) in an amount of about 0.05 to 0.12 wt %; aluminum (Al) in an amount of about 3.0 to 7.0 wt %; manganese (Mn) in an amount of about 0.5 wt % or less (not 0%); nickel (Ni) in an amount of about 0.5 wt % or less (not 0%); chromium (Cr) in an amount of about 0.75 wt % or less (not 0%); silicon (Si) in an amount of about 0.3 to 0.75 wt %; a combined amount of titanium (Ti) and vanadium (V) in an amount of about 0.25 to 0.7 wt %; and a balance being iron (Fe), all the wt % are based on the total weight of the ferritic steel.
    Type: Grant
    Filed: May 14, 2018
    Date of Patent: January 26, 2021
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Dong Hwi Kim, Bong Lae Jo
  • Patent number: 10900099
    Abstract: Provided is a steel H-shape for low temperature service including a predetermined chemical composition. A CEV obtained by CEV=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 is 0.40 or less. A sum of an area ratio of one or both of ferrite and bainite at a 1/4 position from an outer side across a thickness of a flange and a 1/6 position from an outer side across a flange width is 90% or more, and an area ratio of a hard phase is 10% or less. An effective grain size is 20.0 ?m or less, and a grain size of the hard phase is 10.0 ?m or less. 30 pieces/mm2 or more Ti oxides having an equivalent circle diameter ranging from 0.01 to 3.0 ?m are included. The thickness of the flange ranges from 12 to 50 mm.
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: January 26, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Hidetoshi Ito, Kazutoshi Ichikawa
  • Patent number: 10892076
    Abstract: A rare earth magnet includes a main phase, a grain boundary phase present around the main phase and an intermediate phase interposed between the main phase and the grain boundary phase, and has an overall composition that is represented by the formula ((Ce(1-x)Lax)(1-y)R1y)pT(100-p-q-r)BqM1r?(R21-zM2z)s (where, R1 and R2 are rare earth elements other than Ce and La, T is at least one selected from among Fe, Ni, and Co, M1 is an element having a small amount that does not influence magnetic characteristics, and M2 is an alloy element for which a melting point of R21-zM2z is lower than a melting point of R2). A total concentration of Ce and La is higher in the main phase than in the intermediate phase, and a concentration of R2 is higher in the intermediate phase than in the main phase.
    Type: Grant
    Filed: December 5, 2017
    Date of Patent: January 12, 2021
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masaaki Ito, Noritsugu Sakuma, Tetsuya Shoji, Hidefumi Kishimoto, Masao Yano
  • Patent number: 10892090
    Abstract: A magnet core for low-frequency applications and method for producing a magnet core for low-frequency applications is provided. The magnet core is made of a spiral-wound, soft-magnetic, nanocrystalline strip. The strip essentially has the alloy composition FeRestCoaCubNbcSidBeCf, wherein a, b, c, d, e and f are stated in atomic percent and 0?a?1; 0.7?b?1.4; 2.5?c?3.5; 14.5?d?16.5; 5.5?e?8 and 0?f?1, and cobalt may wholly or partially be replaced by nickel. The magnet core has a saturation magnetostriction ?s of ?s<2 ppm, a starting permeability ?1 of ?1>100 000 and a maximum permeability ?max of ?max>400 000. In addition, a sealing metal oxide coating is provided on the surfaces of the strip.
    Type: Grant
    Filed: July 19, 2016
    Date of Patent: January 12, 2021
    Assignee: Vacuumschmelze GmbH & Co. KG
    Inventor: Jörg Petzold
  • Patent number: 10876180
    Abstract: A method of manufacturing a hot rolled steel sheet for a square column for building structural members includes a hot rolling step, a cooling step, and a coiling step performed on a steel to form a hot rolled steel sheet, wherein the steel has a composition containing, in terms of % by mass, C: 0.07 to 0.18%, Mn: 0.3 to 1.5%, P: 0.03% or less, S: 0.015% or less, Al: 0.01 to 0.06%, N: 0.0006% or less, and the balance being Fe and unavoidable impurities.
    Type: Grant
    Filed: June 13, 2017
    Date of Patent: December 29, 2020
    Assignee: JFE Steel Corporation
    Inventors: Chikara Kami, Yuta Tamura, Takato Tamai, Shuji Kawamura