Treatment In A Magnetic Field Patents (Class 148/103)
  • Patent number: 11309109
    Abstract: An inductive core including a body including a ferromagnetic material and a magnet, the magnet forming a first path for circulating of magnetic flux lines produced by the magnet, and the ferromagnetic material at least partially forming a second path for circulating the magnetic flux lines, wherein the ferromagnetic material extends continuously between the poles of the magnet along the poles of the magnet and makes contact with at least a part of an exterior lateral wall of the magnet extending between its poles.
    Type: Grant
    Filed: December 16, 2016
    Date of Patent: April 19, 2022
    Assignee: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
    Inventor: Gerard Delette
  • Patent number: 11145444
    Abstract: An R-T-B-based sintered magnet 2 contains a rare earth element R, a transition metal element T, B, Ga, and O, the sintered magnet 2 includes a magnet body 4 and an oxidized layer 6 covering the magnet body 4, the magnet body 4 includes main phase grains 8 containing a crystal of R2T14B and a grain boundary phase 1 positioned between the main phase grains 8 and containing R, the oxidized layer 6 includes a plurality of oxide phases 3A containing R, T, Ga, and O, the oxide phase 3A satisfies the following Formulas (1) and (2) regarding the content (unit: atom %) of each element, and the oxide phase 3A in the oxidized layer 6 covers the grain boundary phase 1 in the magnet body 4. 0.3?[R]/[T]?0.5??(1) 0.2?[O]/([R]+[T]+[Ga]+[O])?0.
    Type: Grant
    Filed: March 26, 2019
    Date of Patent: October 12, 2021
    Assignee: TDK Corporation
    Inventors: Mariko Fujiwara, Masashi Miwa
  • Patent number: 10903001
    Abstract: A method and an apparatus for producing a radially aligned magnetorheological elastomer molded body containing a matrix resin and a magnetic filler are provided. The method includes the following: placing a permanent magnet 11 in at least one position selected from positions that are spaced from a metal mold 14a having a cavity 14b and located above and below the center of the metal mold 14a; providing a closed magnetic circuit that allows a magnetic flux 19a generated by the permanent magnet 11 to pass through the metal mold 14a from a side thereof, filling the cavity 14b with a composition containing the matrix resin and the magnetic filler; and molding the composition while the magnetic filler is radially aligned. With this configuration, the elastomer material is molded while the magnetic filler is radially aligned by using the permanent magnet.
    Type: Grant
    Filed: June 12, 2018
    Date of Patent: January 26, 2021
    Assignee: Fuji Polymer Industries Co., Ltd.
    Inventor: Shingo Kobayashi
  • Patent number: 10876179
    Abstract: A method is provided for producing a hot-formed component, in particular a sheet-metal component made of steel, aluminum, magnesium or a combination of the materials. The method includes the acts of: heating a semifinished product, in particular a sheet-metal blank or a pre-shaped sheet-metal component, inserting the semifinished product into a molding tool, and quenching the semifinished product in the molding tool, wherein a change is made to the microstructure of the material at least in one portion. Before the insertion of the semifinished product into the molding tool, an insulating device is applied in at least one predetermined region of the semifinished product. The insulating device is connected in a form-fitting, integral and/or force-fitting manner to the semifinished product.
    Type: Grant
    Filed: February 3, 2017
    Date of Patent: December 29, 2020
    Assignee: Bayerische Motoren Werke Aktiengesellschaft
    Inventors: Bernd Kupetz, Juergen Becker
  • Patent number: 10867727
    Abstract: The present invention provides a rare earth permanent magnet material and manufacturing method thereof. The manufacturing method of the present invention comprises a multi-arc ion plating step and a infiltrating step, wherein multi-arc ion plating process is adopted to deposit a metal containing a heavy rare earth element on a surface of a sintered neodymium-iron-boron magnet which has a thickness of 10 mm or less in at least one direction; and then heat treatment is performed on the sintered neodymium-iron-boron after deposition. The sum of an intrinsic coercive force (Hcj, in unit of kOe) and a maximum magnetic energy product ((BH)max, in unit of MGOe) of the permanent magnet material of the present invention is 66.8 or more. Moreover, the manufacturing method of the present invention has high production efficiency and does not increase harmful substances, and the price of devices is relatively low.
    Type: Grant
    Filed: March 3, 2016
    Date of Patent: December 15, 2020
    Inventors: Yi Dong, Shulin Diao, Haibo Yi, Shujie Wu, Zhanjiang Hu, Qian Zhang, Gazhen Liu, Juchang Miao, Yi Yuan, Ya Chen, Wenjie Yuan
  • Patent number: 10607773
    Abstract: When a powder material (5) is molded by introducing the material into a cavity (11) between a lower punch (2) and a die (1), compression molding the material between upper and lower punches (3 and 2) into a compact (51) of desired shape, and moving up the lower punch (2) to eject the compact (51), a lubricant is applied to the interior surface of the die (1) by fitting a pad (24) around the lower punch (2) and impregnating the pad with the lubricant. Since the lubricant is applied on every molding operation, molding operation can be continuously carried out.
    Type: Grant
    Filed: March 2, 2016
    Date of Patent: March 31, 2020
    Assignee: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Osamu Kohno, Yoshihiro Umebayashi, Ryuji Nakamura, Takahiro Hashimoto
  • Patent number: 10541082
    Abstract: When a powder material (5) is molded by introducing the material into a cavity (11) between a lower punch (2) and a die (1), compression molding the material between upper and lower punches (3 and 2) into a compact (51) of desired shape, and moving up the lower punch (2) to eject the compact (51), a lubricant is applied to the interior surface of the die (1) by fitting a pad (24) around the lower punch (2) and impregnating the pad with the lubricant. Since the lubricant is applied on every molding operation, molding operation can be continuously carried out.
    Type: Grant
    Filed: March 2, 2016
    Date of Patent: January 21, 2020
    Assignee: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Osamu Kohno, Yoshihiro Umebayashi, Ryuji Nakamura, Takahiro Hashimoto
  • Patent number: 10495702
    Abstract: According to one embodiment, a sensor includes a first film, a first sensor portion, a driving portion, and a processor. The first sensor portion is provided at the first film. The first sensor portion includes a first magnetic layer, a second magnetic layer, and a first intermediate layer. The second magnetic layer is provided between the first film and the first magnetic layer. The first intermediate layer is provided between the first magnetic layer and the second magnetic layer. The driving portion causes the first film to deform at a first frequency. The processor outputs a third signal based on a first signal and a second signal. The first signal relates to the first frequency. The second signal is output from the first sensor portion.
    Type: Grant
    Filed: September 15, 2017
    Date of Patent: December 3, 2019
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoshihiro Higashi, Michiko Hara, Tomohiko Nagata, Shiori Kaji, Yoshihiko Fuji, Akiko Yuzawa, Kenji Otsu, Kazuaki Okamoto, Shotaro Baba
  • Patent number: 10388441
    Abstract: The present invention provides an R-T-B based sintered magnet that inhibits the demagnetization rate at high temperature even when less or no heavy rare earth elements such as Dy, Tb and the like are used. The R-T-B based sintered magnet includes R2T14B crystal grains and two-grain boundary parts between the R2T14B crystal grains. Two-grain boundary parts formed by R—Co—Cu-M-Fe phase exist, and M is at least one selected from the group consisting of Ga, Si, Sn, Ge and Bi.
    Type: Grant
    Filed: August 8, 2014
    Date of Patent: August 20, 2019
    Assignee: TDK CORPORATION
    Inventors: Isao Kanada, Hiroyuki Ono, Eiji Kato, Masashi Miwa
  • Patent number: 10332666
    Abstract: The magnetoresistance effect device includes: a first port; a second port; a magnetoresistance effect element; a first signal line that is connected to the first port and applies a high frequency magnetic field to the magnetoresistance effect element; a second signal line that connects the second port and the magnetoresistance effect element to each other; and a direct current application terminal capable of being connected to a power supply that applies a direct current or a direct current voltage. The first signal line includes a magnetic field generator, which extends in a first direction, at a position in the lamination direction of the magnetoresistance effect element or an in-plane direction that is orthogonal to the lamination direction, and the magnetic field generator and the magnetoresistance effect element include an overlapping portion as viewed from the lamination direction in which the magnetic field generator is disposed, or the in-plane direction.
    Type: Grant
    Filed: April 25, 2018
    Date of Patent: June 25, 2019
    Assignee: TDK CORPORATION
    Inventors: Takekazu Yamane, Junichiro Urabe, Tsuyoshi Suzuki, Atsushi Shimura
  • Patent number: 10312019
    Abstract: A method for producing a permanent magnet, comprising the step: (a) providing a powder of a magnetic material, (b) coating the powder particles with a coating of a diamagnetic or paramagnetic coating material, (c) compressing the coated particles to form a pressed part, (d) heat treatment to sinter the coating material at a temperature less than a temperature suitable for sintering the magnetic material, while the coating material transfers to a matrix of a diamagnetic or paramagnetic material, which embeds the particles of the magnetic material, and (e) magnetizing the magnetizable material in an external magnetic field, wherein the steps (c), (d) and (e) are carried out in any order successively or at the same time in any desired combination.
    Type: Grant
    Filed: October 24, 2013
    Date of Patent: June 4, 2019
    Assignee: VOLKSWAGEN AKTIENGESELLSCHAFT
    Inventor: Branislav Zlatkov
  • Patent number: 10287656
    Abstract: A rare earth magnet molding (1) of the present invention includes rare earth magnet particles (2), and an insulating phase (3) present among the rare earth magnet particles. Segregation regions (4) in which at least one element selected from the group consisting of Dy, Tb, Pr and Ho is segregated are distributed in the rare earth magnet particles (2). Accordingly, the rare earth magnet molding that has excellent resistance to heat in motor environments or the like while maintaining high magnetic characteristics (coercive force) is provided.
    Type: Grant
    Filed: August 4, 2010
    Date of Patent: May 14, 2019
    Assignee: NISSAN MOTOR CO., LTD.
    Inventors: Yoshio Kawashita, Kiyohiro Uramoto, Takashi Miyamoto, Yoshiteru Yasuda
  • Patent number: 10229777
    Abstract: A magnetic component including at least one region is disclosed. The at least one region includes nitrogen and a concentration of the nitrogen in the at least one region is graded across a dimension of the at least one region. Further, a saturation magnetization in the at least one region is graded across the dimension of the at least one region. Further, a method of varying the magnetization values in at least one region of the magnetic component is disclosed.
    Type: Grant
    Filed: March 23, 2016
    Date of Patent: March 12, 2019
    Assignee: General Electric Company
    Inventors: Min Zou, Francis Johnson, Patel Bhageerath Reddy, James Pellegrino Alexander, Ayman Mohamed Fawzi EL-Refaie, Wanming Zhang
  • Patent number: 10229776
    Abstract: A magnetic component including first and second regions, and a method of varying the magnetization values in different regions of the magnetic component are disclosed. The first and the second regions are characterized by a nitrogen content that is different from each other. At least one of the first region and the second region is partially-magnetic and has a nitrogen content in a range from about 0.1 weight % to about 0.4 weight % of that region. A concentration of carbon, if present, of both the first and second regions is less than about 0.05 weight % of the respective regions.
    Type: Grant
    Filed: March 23, 2016
    Date of Patent: March 12, 2019
    Assignee: General Electric Company
    Inventors: Francis Johnson, Min Zou, Patel Bhageerath Reddy, James Pellegrino Alexander, Ayman Mohamed Fawzi EL-Refaie
  • Patent number: 10217562
    Abstract: A method for producing a sintered R-T-B based magnet of this disclosure includes the steps of preparing a plurality of sintered R-T-B based magnet bodies (R is at least one of rare earth elements and necessarily contains Nd and/or Pr; and T is at least one of transition metals and necessarily contains Fe); preparing a plurality of alloy powder particles having a size of 90 ?m or less and containing a heavy rare earth element RH (the heavy rare earth RH is Tb and/or Dy) at a content of 20 mass % or greater and 80 mass % or less; loading the plurality of sintered R-T-B based magnet bodies and the plurality of alloy powder particles of a ratio of 2% by weight or greater and 15% by weight or less with respect to the plurality of sintered R-T-B based magnet bodies into a process chamber; and heating, while rotating and/or swinging, the process chamber to move the sintered R-T-B based magnet bodies and the alloy powder particles continuously or intermittently to perform an RH supply and diffusion process.
    Type: Grant
    Filed: February 23, 2016
    Date of Patent: February 26, 2019
    Assignee: HITACHI METALS, LTD.
    Inventors: Ryouichi Yamagata, Futoshi Kuniyoshi
  • Patent number: 10190206
    Abstract: A magnetic component having intermixed first and second regions, and a method of preparing that magnetic component are disclosed. The first region includes a magnetic phase and the second region includes a non-magnetic phase. The method includes mechanically masking pre-selected sections of a surface portion of the component by using a nitrogen stop-off material and heat-treating the component in a nitrogen-rich atmosphere at a temperature greater than about 900° C. Both the first and second regions are substantially free of carbon, or contain only limited amounts of carbon; and the second region includes greater than about 0.1 weight % of nitrogen.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: January 29, 2019
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Laura Cerully Dial, Richard DiDomizio, Francis Johnson
  • Patent number: 10186374
    Abstract: A method of making a magnetic material for a permanent magnet using hot-pressing or die-upset methods, or both, by combining two powders and optimizing grain boundary diffusion of Dy or Tb. The method can include making magnetic material for a permanent magnet using hot pressing using a core powder containing Nd, Fe and B and a surface powder containing Dy or Tb in metallic alloy form, combining the materials, forming a solid material in a shaped mold under a magnetic field in vacuum, heating the solid material, hot pressing it to form a magnetic material in a die, heat treating it if necessary, and then cooling it.
    Type: Grant
    Filed: February 28, 2014
    Date of Patent: January 22, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventor: Yucong Wang
  • Patent number: 10060021
    Abstract: [Problem] To provide a means for forming a thin-film in a desired part of an object to be treated. [Solution] The thin-film formation means according to the present invention is part of a thin-film formation method which supplies electricity to a raw-material gas in a reduced pressure container, converting the raw-material gas to plasma, and irradiates the plasma, thus forming a thin-film on the surface of an object to be treated. Therein, the effect of a magnetic field generated by a magnetic field generating means is used to form the thin-film in a desired part. The effect of the magnetic field focuses the flux of the plasma in a desired part of the surface of the object to be treated, thus enabling the thin-film to be formed in the desired part.
    Type: Grant
    Filed: September 20, 2012
    Date of Patent: August 28, 2018
    Assignee: Shibaura Institute of Technology
    Inventors: Tatsuhiko Aizawa, Hiroshi Morita, Shuichi Kurosumi
  • Patent number: 10056188
    Abstract: The present invention provides a producing method of R-T-B-based sintered magnets in which, the recovery chamber 40 includes inert gas introducing means 42, evacuating means 43, a carry-in port, a discharge port 40a, and a recovery container 60. The recovery step includes a carrying-in step of conveying a processing container 50 into the recovery chamber 40, a discharging step of discharging coarsely pulverized powder in the processing container 50 into the recovery chamber 40, a gas introducing step of introducing inert gas into the recovery chamber 40, and an alloy accommodating step of recovering the coarsely pulverized powder into the recovery container 60. Addition of pulverization aid is carried out in the alloy accommodating step. A remaining amount of coarsely pulverized powder in the recovery chamber 40, an oxygen-containing amount of the R-T-B-based sintered magnet is reduced, and magnetic properties are enhanced.
    Type: Grant
    Filed: January 26, 2012
    Date of Patent: August 21, 2018
    Assignee: HITACHI METALS, LTD.
    Inventors: Mitsuaki Mochizuki, Shoji Nakayama, Kazuhiro Sonoda
  • Patent number: 9901984
    Abstract: 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).
    Type: Grant
    Filed: February 21, 2014
    Date of Patent: February 27, 2018
    Assignee: Yantai Zhenghai Magnetic Material Co., Ltd.
    Inventors: Qingkai Wang, Dongdong Li, Buzhuang Peng, Meizhu Shao, Rui Wei
  • Patent number: 9863021
    Abstract: A NdFeB rare earth permanent magnet with composite main phase and a manufacturing method thereof are provided. In the composite main phase, a PR2(Fe1-x-yCoxAly)14B main phase is the core, ZR2(Fe1-w-nCowAln)14B main phase surrounds a periphery of the PR2(Fe1-x-yCoxAly)14B main phase, and no grain boundary phase exists between ZR2(Fe1-w-nCowAln)14B main phase and the PR2(Fe1-x-yCoxAly)14B main phase, wherein ZR represents a group of rare earth elements in which a content of heavy rare earth is higher than an average content of heavy rare earth in the composite main phase, PR represents a group of rare earth elements in which a content of heavy rare earth is lower than an average content of heavy rare earth in the composite main phase. The manufacturing method includes steps of LR—Fe—B-Ma alloy melting, HR—Fe—B-Mb alloy melting, alloy hydrogen decrepitating, metal oxide micro-powder surface absorbing and powdering, magnetic field pressing, sintering and ageing.
    Type: Grant
    Filed: May 11, 2015
    Date of Patent: January 9, 2018
    Assignee: SHENYANG GENERAL MAGNETIC CO., LTD
    Inventor: Baoyu Sun
  • Patent number: 9767945
    Abstract: A magnet powder having a composition composed of R (R consists of R1 and R2, R1 represents at least one rare earth element selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Er, Tm, Yb and Lu, R2 represents at least one rare earth element selected from the group consisting of Ho and Gd). T (T represents at least one transition metal element containing Fe or the combination of Fe and Co as essential element(s)) and B, wherein, the atomic ratio of R2/(R1×R2) is 0.05 to 0.1, the ratio of R/T is 0.25 to 0.35, and the magnet powder has an average primary particle size of 45 to 100 nm. The present invention also provides a bond magnet using the magnet powder.
    Type: Grant
    Filed: April 3, 2015
    Date of Patent: September 19, 2017
    Assignee: TDK CORPORATION
    Inventors: Daisuke Tanaka, Yasushi Enokido
  • Patent number: 9634549
    Abstract: A magnetic component having intermixed first and second regions, and a method of preparing that magnetic component are disclosed. The first region includes a magnetic phase and the second region includes a non-magnetic phase. The method includes mechanically masking pre-selected sections of a surface portion of the component by using a nitrogen stop-off material and heat-treating the component in a nitrogen-rich atmosphere at a temperature greater than about 900° C. Both the first and second regions are substantially free of carbon, or contain only limited amounts of carbon; and the second region includes greater than about 0.1 weight % of nitrogen.
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: April 25, 2017
    Assignee: General Electric Company
    Inventors: Laura Cerully Dial, Richard DiDomizio, Francis Johnson
  • Patent number: 9536650
    Abstract: Magnetic structure production may relate, by way of example but not limitation, to methods, systems, etc. for producing magnetic structures by printing magnetic pixels (aka maxels) into a magnetizable material. Disclosed herein is production of magnetic structures having, for example: maxels of varying shapes, maxels with different positioning, individual maxels with different properties, maxel patterns having different magnetic field characteristics, combinations thereof, and so forth. In certain example implementations disclosed herein, a second maxel may be printed such that it partially overwrites a first maxel to produce a magnetic structure having overlapping maxels. In certain example implementations disclosed herein, a magnetic printer may include a print head comprising multiple parts and having various properties. In certain example implementations disclosed herein, various techniques for using a magnetic printer may be employed to produce different magnetic structures.
    Type: Grant
    Filed: August 16, 2014
    Date of Patent: January 3, 2017
    Assignee: CORRELATED MAGNETICS RESEARCH, LLC.
    Inventor: Larry W. Fullerton
  • Patent number: 9492869
    Abstract: A double-alloy NdFeB rare earth permanent magnetic material and manufacturing method thereof are provided. The method comprises respectively melting an A1 alloy comprising heavy rare earth such as Dy, Tb, Ho and Gd as well as an A2 alloy comprising light rare earth such as La, Ce, Pr and Nd; mixing the A1 alloy and the A2 alloy by a two-dimensional or three-dimensional mixer with a ratio of A1/A2=0˜0.5 under protection of nitrogen; producing powder in a jet mill after mixing; collecting fine powder; putting and mixing the powder and the fine powder in the two-dimensional or three-dimensional mixer; putting into a magnetic field pressing machine for pressing under the protection of the nitrogen after mixing and producing permanent magnetic products by sintering, aging, etc. The present invention can obviously decrease rare earth utilization and increase a magnetic energy product and coercivity of the rare earth permanent magnet.
    Type: Grant
    Filed: October 7, 2013
    Date of Patent: November 15, 2016
    Assignee: China North Magnetic & Electronic Technology Co., LTD
    Inventor: Haotian Sun
  • Patent number: 9463430
    Abstract: A magnetically assisted slurry bubble column reactor. A gas-liquid-solid three-phase stream is subjected to a reaction in the reactor, and a magnetic field generator generates inside the reactor a magnetic field in a direction opposite to the flow direction of the reaction streams. A catalyst inside the reactor is sensitive to the magnetic field. The field imparts a magnetic force on said catalyst offsetting the driving force of the flowing gas-liquid-solid three-phase reaction streams, so as to allow the catalyst to be present in a relatively static state inside the reactor with other reaction streams present in a flowing state. The magnetically assisted slurry bubble column reactor in the present invention can be used in a Fischer-Tropsch reaction.
    Type: Grant
    Filed: January 15, 2013
    Date of Patent: October 11, 2016
    Assignees: National Institute of Clean-and-Low-Carbon Energy, Shenhua Group Corporation Limited
    Inventors: Mingsheng Luo, Qiang Miao, Jaiqing Zhu
  • Patent number: 9385563
    Abstract: Disclosed herein is a rotor permanent magnet apparatus for a drive motor based on temperature distribution. The permanent magnet may enhance coercivity without a substantial decrease in magnetic flux density Br by applying a grain boundary diffusion process of diffusing dysprosium on the surface of the permanent magnet based on the temperature distribution of the permanent magnet.
    Type: Grant
    Filed: March 27, 2013
    Date of Patent: July 5, 2016
    Assignee: Hyundai Motor Company
    Inventors: Kyoung Bum Kim, Sang Hoon Moon, Hyoung Jun Cho, Jung Shik Kim
  • Patent number: 9275778
    Abstract: The present invention relates to a permanent magnet obtained by wet-mixing a Dy compound or a Tb compound with a magnet raw material to coat a surface of the magnet raw material with the Dy compound or the Tb compound, and sintering a green sheet obtained by mixing the resulting magnet raw material with a resin binder and molding the resulting mixture. Since the present invention has the above-mentioned constitution, it becomes possible to sufficiently improve coercive force by Dy or Tb while decreasing the amount of Dy or Tb used. Further, it can be prevented that Dy or Tb is solid-solutionized in magnet particles to decrease residual magnetization.
    Type: Grant
    Filed: March 17, 2009
    Date of Patent: March 1, 2016
    Assignee: NITTO DENKO CORPORATION
    Inventors: Izumi Ozeki, Katsuya Kume, Junichi Nakayama, Yuuki Fukuda, Toshinobu Hoshino, Tomokazu Horio
  • Patent number: 9272332
    Abstract: A method of near net shaping a rare earth permanent magnet and a permanent magnet. The method includes introducing a magnetic material powder into a die, closing the die and shock compacting the powder in the die and sintering the compacted magnet powder to form the rare earth permanent magnet part. In one form, the magnetic material being subjected to compaction is a mixture made up of two or more different magnetic material powder precursors. Additional materials may be added to the mixture. One such additional material may be a lubricant to reduce the likelihood of cracking, while another may be a coating to provide oxidation protection of the mixture. Evacuation or inert environments may also be used either prior to or in conjunction with the sintering or related high-temperature part of the process.
    Type: Grant
    Filed: September 27, 2012
    Date of Patent: March 1, 2016
    Assignee: GM Global Technology Operations LLC
    Inventors: Edward P. Becker, Yucong Wang
  • Patent number: 9171668
    Abstract: A magnet member excellent in both corrosion resistance and adhesion is provided. The magnet member 30 in accordance with the present invention is a magnet member comprising a magnet base body 32 including a rare-earth magnet and a plating film 34 containing Ni and covering the magnet base body 32, while the plating film 34 has a sulfur content lower in a marginal part 38 in a surface S of the magnet base body having an easy magnetization direction M of the magnet base body 32 as a perpendicular thereto than in a center part 36 of the surface S.
    Type: Grant
    Filed: March 2, 2012
    Date of Patent: October 27, 2015
    Assignee: TDK CORPORATION
    Inventor: Kenichi Yoshida
  • Patent number: 9111679
    Abstract: A method of producing an R-T-B rare earth magnet that include forming an R-T-B (R: rare-earth element, T: Fe, or Fe and partially Co that substitutes for part of Fe) rare earth alloy powder into a compact and performing hot working on the compact, wherein the hot working is performed in a direction that is different from the direction in which the forming was performed.
    Type: Grant
    Filed: February 22, 2012
    Date of Patent: August 18, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Noritaka Miyamoto, Akira Manabe, Tetsuya Shoji, Daisuke Ichigozaki
  • Patent number: 9070508
    Abstract: A method of producing an R-T-B rare earth magnet that include forming an R-T-B (R: rare-earth element, T: Fe, or Fe and partially Co that substitutes for part of Fe) rare earth alloy powder into a compact and performing hot working on the compact, wherein the hot working is performed in a direction that is different from the direction in which the forming was performed.
    Type: Grant
    Filed: February 22, 2012
    Date of Patent: June 30, 2015
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Noritaka Miyamoto, Akira Manabe, Tetsuya Shoji, Daisuke Ichigozaki
  • Patent number: 9048014
    Abstract: There are provided a permanent magnet and a manufacturing method thereof capable of decreasing an activity level of a calcined body activated by a calcination process. To fine powder of milled neodymium magnet is added an organometallic compound solution containing an organometallic compound expressed with a structural formula of M?(OR)x (M represents Dy or Tb, R represents a substituent group consisting of a straight-chain or branched-chain hydrocarbon, x represents an arbitrary integer) so as to uniformly adhere the organometallic compound to particle surfaces of the neodymium magnet powder. Thereafter, desiccated magnet powder is held for several hours in hydrogen atmosphere at 200 through 900 degrees Celsius. Thereafter, the powdery calcined body calcined through the calcination process in hydrogen is held for several hours in vacuum atmosphere at 200 through 600 degrees Celsius for a dehydrogenation process.
    Type: Grant
    Filed: March 28, 2011
    Date of Patent: June 2, 2015
    Assignee: NITTO DENKO CORPORATION
    Inventors: Izumi Ozeki, Katsuya Kume, Keisuke Hirano, Tomohiro Omure, Keisuke Taihaku, Toshinobu Hoshino, Takashi Ozaki
  • Patent number: 9044834
    Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for recycling magnetic material to restore or improve the magnetic performance. One of the methods includes demagnetizing magnetic material from a waste magnet assembly by cyclic heating and cooling of the magnetic material, fragmenting adhesives attached to the magnetic material, cracking coating layers of the magnetic material, and subjecting the magnetic material to at least one of: a) a mechanical treatment or b) a chemical treatment, to remove the coating layers and prepare the magnetic material without impurities, fragmenting the demagnetized magnetic material to form a powder, and mixing the powder with a rare earth material R and an elemental additive A to produce a homogeneous powder, wherein the rare earth material R comprises at least one of: Nd or Pr, and the elemental additive A comprises at least one of: Nd, Pr, Dy, Co, Cu, and Fe.
    Type: Grant
    Filed: June 17, 2014
    Date of Patent: June 2, 2015
    Assignee: Urban Mining Technology Company
    Inventors: Miha Zakotnik, Peter Afiuny, Scott Dunn, Catalina Oana Tudor
  • Patent number: 8968490
    Abstract: A ferromagnetic amorphous alloy ribbon includes an alloy having a composition represented by FeaSibBcCd where 80.5?a?83 at. %, 0.5?b?6 at. %, 12?c?16.5 at. %, 0.01?d?1 at. % with a+b+c+d=100 and incidental impurities, the ribbon being cast from a molten state of the alloy with a molten alloy surface tension of greater than or equal to 1.1 N/m on a chill body surface; the ribbon having a ribbon length, a ribbon thickness, and a ribbon surface facing the chill body surface; the ribbon having ribbon surface protrusions being formed on the ribbon surface facing the chill body surface; the ribbon surface protrusions being measured in terms of a protrusion height and a number of protrusions; the protrusion height exceeding 3 ?m and less than four times the ribbon thickness, and the number of protrusions being less than 10 within 1.5 m of the cast ribbon length; and the alloy ribbon in its annealed straight strip form having a saturation magnetic induction exceeding 1.
    Type: Grant
    Filed: September 9, 2010
    Date of Patent: March 3, 2015
    Assignees: Metglas, Inc., Hitachi Metals, Ltd.
    Inventors: Eric A. Theisen, James Perrozi, Yuichi Ogawa, Yuji Matsumoto, Daichi Azuma, Ryusuke Hasegawa
  • Publication number: 20140299810
    Abstract: A permanent magnet may include a Fe16N2 phase constitution.
    Type: Application
    Filed: August 17, 2012
    Publication date: October 9, 2014
    Applicant: REGENTS OF THE UNIVERSITY OF MINNESOTA
    Inventors: Jian-Ping Wang, Shihai He, Yanfeng Jiang
  • Publication number: 20140090751
    Abstract: An alloy composition is composed essentially of Hf2-XZrXCo11BY, wherein 0<X<2 and 0<Y?1.5. Moreover, an alloy composition is composed essentially of ferromagnetic Hf2-XZrXCo11BY, wherein 0?X<2 and 0<Y?1.5, and has a nanoscale crystalline structure comprising at least one non-equilibrium phase. The alloys can be melt-spun with in-situ and/or ex-situ annealing to produce the nanoscale crystalline structure.
    Type: Application
    Filed: October 2, 2013
    Publication date: April 3, 2014
    Applicant: UT-Battelle, LLC
    Inventors: Michael Alan McGuire, Orlando Rios, Nirmal Jeevi Ghimire
  • Patent number: 8684594
    Abstract: A constant-modulus alloy, which has a low saturation magnetic flux density to provide weakly magnetic properties, a high Young's modulus, a low temperature coefficient of Young's modulus, and high hardness, is provided. A hairspring, a mechanical driving apparatus and a watch and clock, in which the alloy is used, are provided. The alloy consists of Co, Ni, Cr, Mo. and Fe. The alloy is healed and cooled before being subjected to repeated wiredrawing and intermediate annealing, forming a wire with a fiber structure having a <111> fiber axis. The wire is then cold rolled into a sheet and heated to obtain optimal magnetic insensitivity and hardness.
    Type: Grant
    Filed: November 16, 2009
    Date of Patent: April 1, 2014
    Assignees: The Foundation: The Research Institute for Electric and Magnetic Materials, Seiko Instruments Inc.
    Inventors: Yuetsu Murakami, Koichiro Jujo, Osamu Takahashi, Jun Tsuneyoshi, Ryo Sugawara, Takeshi Takano
  • Patent number: 8572830
    Abstract: A method and apparatus for producing a magnetic attachment mechanism is described. A method is provided for determining the magnetic field axis of an element prior to machining it. The magnetic field axis can be used as a reference to machine an outer surface of the magnetic element at a desired angle. The method provides a means to more precisely align magnetic field axes of corresponding magnets in a magnetic attachment system.
    Type: Grant
    Filed: August 11, 2011
    Date of Patent: November 5, 2013
    Assignee: Apple Inc.
    Inventor: Cesare A. Tolentino
  • Patent number: 8562756
    Abstract: The present invention is aimed at providing a method for producing an NdFeB sintered magnet having a higher coercivity and higher squareness of the magnetization curve than ever before. A method for producing an NdFeB sintered magnet according to the present invention includes the steps of forming a layer containing Dy and/or Tb on the surface of an NdFeB sintered magnet base material and then performing a grain boundary diffusion process for diffusing Dy and/or Tb from the aforementioned layer through the crystal grain boundaries of the magnet base material into the magnet base material by heating the magnet base material to a temperature equal to or lower than the sintering temperature thereof, and this method is characterized in that a) the content of a rare earth in a metallic state in the magnet base material is equal to or higher than 12.
    Type: Grant
    Filed: January 9, 2009
    Date of Patent: October 22, 2013
    Assignee: Intermetallics Co., Ltd.
    Inventors: Masato Sagawa, Naoki Fujimoto
  • Patent number: 8545641
    Abstract: A method for manufacturing a sintered rare-earth magnet having a magnetic anisotropy, in which a very active powder having a small grain size can be safely used in a low-oxidized state. A fine powder as a material of the sintered rare-earth magnet having a magnetic anisotropy is loaded into a mold until its density reaches a predetermined level. Then, in a magnetic orientation section, the fine powder is oriented by a pulsed magnetic field. Subsequently, the fine powder is not compressed but immediately sintered in a sintering furnace. A multi-cavity mold for manufacturing a sintered rare-earth magnet having an industrially important shape, such as a plate magnet or an arched plate magnet, may be used.
    Type: Grant
    Filed: June 30, 2005
    Date of Patent: October 1, 2013
    Assignee: Intermetallics Co., Ltd.
    Inventors: Masato Sagawa, Hiroshi Nagata, Osamu Itatani
  • Patent number: 8518194
    Abstract: A magnetic article comprises, in total, elements in amounts capable of providing at least one (La1-aMa)(Fe1-b-cTbYc)13-dXe phase and less than 0.5 Vol % impurities, wherein 0?a?0.9, 0?b?0.2, 0.05?c?0.2, ?1?d?+1, 0?e?3, M is one or more of the elements Ce, Pr and Nd, T is one or more of the elements Co, Ni, Mn and Cr, Y is one or more of the elements Si, Al, As, Ga, Ge, Sn and Sb and X is one or more of the elements H, B, C, N, Li and Be. The magnetic article comprises a permanent magnet.
    Type: Grant
    Filed: September 30, 2009
    Date of Patent: August 27, 2013
    Assignee: Vacuumschmelze GmbH & Co. KG
    Inventors: Matthias Katter, Joachim Gerster, Ottmar Roth
  • Publication number: 20130192723
    Abstract: A method for manufacturing a magnetized bonded magnet, including the steps of: arranging a magnetization permanent magnet for magnetizing a magnetic field near a non-magnetized bonded magnet; heating the non-magnetized bonded magnet to a temperature of a Curie point thereof or higher; and continuously magnetizing the magnetic field to the non-magnetized bonded magnet by the magnetization permanent magnet for magnetizing the magnetic field while cooling the non-magnetized bonded magnet reached at the temperature of the Curie point thereof or higher to a temperature of less than the Curie point, wherein the non-magnetized bonded magnet is a rare-earth iron bonded magnet including two or more different rare-earth elements in magnet powder thereof.
    Type: Application
    Filed: December 18, 2012
    Publication date: August 1, 2013
    Applicant: MINEBEA CO., LTD.
    Inventor: MINEBEA CO., LTD.
  • Patent number: 8425695
    Abstract: A rare earth sintered magnet includes a main phase that includes an R2T14B phase of crystal grain where R is one or more rare earth elements including Nd, T is one or more transition metal elements including Fe or Fe and Co, and B is B or B and C; a grain boundary phase in which a content of R is larger than a content of the R2T14B phase; and a grain boundary triple point that is surrounded by three or more main phases. The grain boundary triple point includes an R75 phase containing R of 60 at % to 90 at %, Co, and Cu. The relational expression 0.05?(Co+Cu)/R<0.5 is satisfied. An area where a Co-rich region overlaps with a Cu-rich region in a cross-sectional area of the grain boundary triple point is 60% or more.
    Type: Grant
    Filed: July 8, 2011
    Date of Patent: April 23, 2013
    Assignee: TDK Corporation
    Inventors: Takuma Hayakawa, Ryouta Kunieda
  • Patent number: 8414709
    Abstract: The present invention is aimed at providing a method for producing an NdFeB sintered magnet having a higher coercivity and higher squareness of the magnetization curve than ever before. A method for producing an NdFeB sintered magnet according to the present invention includes the steps of forming a layer containing Dy and/or Tb on the surface of an NdFeB sintered magnet base material and then performing a grain boundary diffusion process for diffusing Dy and/or Tb from the aforementioned layer through the crystal grain boundaries of the magnet base material into the magnet base material by heating the magnet base material to a temperature equal to or lower than the sintering temperature thereof, and this method is characterized in that a) the content of a rare earth in a metallic state in the magnet base material is equal to or higher than 12.
    Type: Grant
    Filed: January 9, 2009
    Date of Patent: April 9, 2013
    Assignee: Intermetallics Co., Ltd.
    Inventors: Masato Sagawa, Naoki Fujimoto
  • Patent number: 8388769
    Abstract: To mold a high-resistance magnet at low temperature, including room temperature, the magnet includes magnetic powders, metallic powders having a lower hardness than the magnetic powders and a high-resistance layer, wherein the magnetic powders occupy a larger volume than the metallic powders. In particular, the high-resistance layer contains a fluorine compound and is placed between the magnetic powder and the metallic powders.
    Type: Grant
    Filed: December 19, 2006
    Date of Patent: March 5, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Matahiro Komuro, Yuichi Satsu, Takashi Yasuhara
  • Patent number: 8388766
    Abstract: An anisotropic rare earth sintered magnet has a tetragonal R2Fe14B compound as a major magnetic phase, wherein R is Nd or a mixture of Nd with at least one rare earth element. Grains of the compound phase have two crystallographic axes, c and a-axes aligned. The biaxially aligned magnet exhibits a coercivity Hc of at least 1.6 MA/m.
    Type: Grant
    Filed: October 24, 2011
    Date of Patent: March 5, 2013
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventor: Ken Ohashi
  • Patent number: 8328954
    Abstract: Crystal fractured surfaces of raw meal powder having more equal crystal orientation relationship in the magnetic field are arranged to be assembled together so that a method of manufacturing a permanent magnet which has an extremely high degree of orientation can be provided. In this invention, raw meal powder (P) is filled into a cavity, the raw meal powder (P) is oriented in the magnetic field while being pressed or urged by pressing means that has a smaller area than the cross-sectional area of the cavity. Semi-finished product thus oriented is compression-molded into a predetermined shape in the magnetic field.
    Type: Grant
    Filed: December 25, 2008
    Date of Patent: December 11, 2012
    Assignee: Ulvac, Inc.
    Inventors: Hiroshi Nagata, Yoshinori Shingaki
  • Patent number: 8303732
    Abstract: A rare earth magnet having a composition represented by RTB wherein R denotes a rare earth element, T a transition metal and B boron, the magnet being composed of magnet powder constituted by crystalline particles. The particles of the magnetic powder have a ratio of a short diameter being 10 ?m or more to a long diameter is 0.5 or less. An element Rm having a magnetic anisotropy higher than that of the rare earth element is contained in the surface and inside of the magnet constituted by the magnet powder in an approximately constant concentration. An oxy-fluoride and carbon are present at boundaries of the particles of the magnet powder.
    Type: Grant
    Filed: January 29, 2010
    Date of Patent: November 6, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Hiroyuki Suzuki, Takao Imagawa, Yuichi Satsu, Matahiro Komuro
  • Patent number: 8287661
    Abstract: A method for producing a sintered R-T-B based magnet includes the steps of: providing R-T-B based alloy powders A and B so that the R-T-B based alloy powder B has a particle size D50 that is smaller by at least 1.0 ?m than that of the R-T-B based alloy powder A and that there is a difference ?RH of at least 4 mass % between the higher content of a heavy rare-earth element RH in the R-T-B based alloy powder B and the lower content of the heavy rare-earth element RH in the R-T-B based alloy powder A; mixing these two R-T-B based alloy powders A and B together; compacting the mixed R-T-B based alloy powder to obtain a compact with a predetermined shape; and sintering the compact.
    Type: Grant
    Filed: January 14, 2010
    Date of Patent: October 16, 2012
    Assignee: Hitachi Metals, Ltd.
    Inventors: Rintaro Ishii, Futoshi Kuniyoshi