Patents Examined by Xiaowei Su
  • Permanent magnet and method of making permanent magnet
    Patent number: 11004600
    Abstract: A method includes mixing first and second alloys to form a mixture, pressing the mixture within a first magnetic field to form a magnet having anisotropic particles of the first alloy aligned with a magnetic moment of the magnet, and heat treating the magnet within a second magnetic field to form elongated grains from the second alloy and align the elongated grains with the moment.
    Type: Grant
    Filed: June 19, 2018
    Date of Patent: May 11, 2021
    Assignee: Ford Global Technologies, LLC
    Inventors: Wanfeng Li, Feng Liang, Michael W. Degner
  • Permanent magnet, and motor and power generator using the same
    Patent number: 10991491
    Abstract: In one embodiment, a permanent magnet includes a composition expressed by RpFeqMrCusCo100-p-q-r-s (R is a rare-earth element, M is at least one element selected from Zr, Ti, and Hf, 10?p?13.5 at %, 28?q?40 at %, 0.88?r?7.2 at %, and 3.5?s?13.5 at %), and a metallic structure including a cell phase having a Th2Zn17 crystal phase, and a cell wall phase. A Fe concentration (C1) in the cell phase is in a range from 28 at % to 45 at %, and a difference (C1?C2) between the Fe concentration (C1) in the cell phase and a Fe concentration (C2) in the cell wall phase is larger than 10 at %.
    Type: Grant
    Filed: January 18, 2013
    Date of Patent: April 27, 2021
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yosuke Horiuchi, Shinya Sakurada, Tsuyoshi Kobayashi, Keiko Okamoto, Masaya Hagiwara
  • Corrosion resistant steel, method for producing said steel and its use thereof
    Patent number: 10988824
    Abstract: A corrosion resistant steel having a yield strength of at least 758 MPa is described. The corrosion resistant steel comprises in weight %: 0.005?C<0.03, 14?Cr?17, 2.3?Mo?3.5, 3.2?Ni?4.5, Si?0.6, 0.5?Cu?1.5, 0.4?Mn?1.3, 0.35?V?0.6, 3.2×C?Nb?0.1, W?1.5, 0.5?Co?1.5, 0.02?N?0.05, Ti?0.05, P?0.03, S?0.005, Al?0.05, with the balance of the chemical composition of said corrosion resistant steel being constituted by Fe and inevitable impurities. A manufacturing method of such steel to obtain a quenched and tempered semi finished product is also described.
    Type: Grant
    Filed: June 29, 2016
    Date of Patent: April 27, 2021
    Assignee: VALLOUREC OIL AND GAS FRANCE
    Inventors: Christelle Gomes, Hafida El Alami, Florent Decultieux
  • Samarium-containing soft magnetic alloys
    Patent number: 10982305
    Abstract: The present teaching is generally directed to soft magnetic alloys. In particular, the present teaching is directed to soft magnetic alloys including Samarium (“Sm”). In a non-limiting embodiment, an Sm-containing magnetic alloy is described including 15 wt % to 55 wt % of Cobalt (“Co”), less than 2.5 wt % of Sm, and 35 wt % to 75 wt % of Iron (“Fe”). The Sm-containing magnetic alloy may further include at least one element X, selected from a group including Vanadium (“V”), Boron (“B”), Carbon (“C”), Chromium (“Cr”), Manganese (“Mn”), Molybdenum (“Mo”), Niobium (“Nb”), Nickel (“Ni”), Titanium (“Ti”), Tungsten (“W”), and Silicon (“Si”). The Sm-containing magnetic alloy may further have a magnetic flux density of at least 2.5 Tesla.
    Type: Grant
    Filed: July 26, 2018
    Date of Patent: April 20, 2021
    Assignees: TAIWAN POWDER TECHNOLOGIES CO., LTD., CHINA POWDER TECHNOLOGIES CO., LTD., HPM LABS CO., LTD.
    Inventors: Kuen-Shyang Hwang, Guo-Jiun Shu, Fang-Cheng Chou
  • Rare earth magnet
    Patent number: 10984929
    Abstract: A rare earth magnet includes main phase grains having an R2T14B type crystal structure. The main phase grains include C. A concentration ratio A1 (A1=?C/?C) of the main phase grains is 1.50 or more, where ?C and ?C are respectively a highest concentration of C and a lowest concentration of C in one main phase grain.
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: April 20, 2021
    Assignee: TDK CORPORATION
    Inventors: Wakako Okawa, Syota Goto, Yoshinori Fujikawa
  • Method for producing sintered R—T—B based magnet and diffusion source
    Patent number: 10984930
    Abstract: A method for producing a sintered R-T-B based magnet includes the steps of: providing a sintered R-T-B based magnet work; providing a Pr—Ga alloy powder produced through atomization; subjecting the Pr—Ga alloy powder to a heat treatment at a temperature which is not lower than a temperature that is 250° C. below a melting point of the Pr—Ga alloy powder and which is not higher than the melting point, to obtain a diffusion source from the Pr—Ga alloy powder; and placing the sintered R-T-B based magnet work and the diffusion source in a process chamber, and heating the sintered R-T-B based magnet work and the diffusion source in a vacuum or an inert gas ambient, thereby allowing Pr and Ga to diffuse from the diffusion source into the interior of sintered R-T-B based magnet work.
    Type: Grant
    Filed: September 27, 2018
    Date of Patent: April 20, 2021
    Assignee: HITACHI METALS, LTD.
    Inventor: Futoshi Kuniyoshi
  • Sintered Nd—Fe—B magnet composition and a production method for the sintered Nd—Fe—B magnet
    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
  • Magnetic material and manufacturing method therefor
    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
  • Alloy, magnetic core and process for the production of a tape from an alloy
    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
  • Composite R-Fe-B series rare earth sintered magnet comprising Pr and W
    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
  • Alloy for R—T—B based rare earth sintered magnet and method for producing the R—T—B based rare earth sintered magnet
    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
  • Permanent magnet, rotary electrical machine, and vehicle
    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
  • R-T-B based permanent magnet
    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
  • Electrode design and low-cost fabrication method for assembling and actuation of miniature motors with ultrahigh and uniform speed
    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
  • Non-oriented electrical steel sheet, production method therefor, and motor core
    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
  • Permanent magnet and rotary electrical machine
    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
  • Rapid consolidation method for preparing bulk metastable iron-rich materials
    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
  • R-T-B-based sintered magnet and method for producing same
    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
  • Permanent magnet, motor, and generator
    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
  • Method of manufacturing a crystalline aluminum-iron-silicon alloy
    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