Patents by Inventor Tadahiko Kobayashi

Tadahiko Kobayashi 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).

  • 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: 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: 10770208
    Abstract: A high performance permanent magnet is provided. The permanent magnet includes a composition represented by a composition formula: RpFeqMrCutCo100-p-q-r-t, and a metallic structure including cell phases having a Th2Zn17 crystal phase and Cu-rich phases having higher Cu concentration than the cell phases. An average diameter of the cell phases is 220 nm or less, and in a numeric value range from a minimum diameter to a maximum diameter of the cell phases, a ratio of a number of cell phases having a diameter in a numeric value range of less than upper 20% from the maximum diameter is 20% or less of all the cell phases.
    Type: Grant
    Filed: March 18, 2015
    Date of Patent: September 8, 2020
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yosuke Horiuchi, Shinya Sakurada, Keiko Okamoto, Masaya Hagiwara, Tsuyoshi Kobayashi, Masaki Endo, Tadahiko Kobayashi, Naoyuki Sanada
  • Patent number: 10650947
    Abstract: The invention provides a high-performance permanent magnet. The permanent magnet has a composition that is expressed by a composition formula RpFeqMrCutCo100-p-q-r-t, where R is at least one element selected from a rare earth element, M is at least one element selected from the group consisting of Zr, Ti, and Hf, p is a number satisfying 10.8?p?12.5 atomic percent, q is a number satisfying 25?q?40 atomic percent, r is a number satisfying 0.88?r?4.5 atomic percent, and t is a number satisfying 3.5?t?13.5 atomic percent. The permanent magnet also has a metallic structure that includes a main phase having a Th2Zn17 crystal phase, and a Cu-M rich phase having a higher Cu concentration and a higher M concentration than the main phase.
    Type: Grant
    Filed: March 3, 2015
    Date of Patent: May 12, 2020
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yosuke Horiuchi, Shinya Sakurada, Keiko Okamoto, Masaya Hagiwara, Tsuyoshi Kobayashi, Masaki Endo, Tadahiko Kobayashi, Naoyuki Sanada
  • Patent number: 10593448
    Abstract: In one embodiment, a permanent magnet includes a sintered compact having a composition expressed by a composition formula: Rp1Feq1Mr1Cus1Co100-p1-q1-r1-s1 (R is a rare-earth element, M is at least one element selected from Zr, Ti, and Hf, 10?p1?13.3 at %, 25?q1?40.0 at %, 0.88?r1?5.4 at %, and 3.5?s1?13.5 at %). The sintered compact includes crystal grains and a Cu-rich phase. The crystal grains are composed of a main phase including a Th2Zn17 crystal phase. The Cu-rich phase has a composition with a high Cu concentration and an average thickness of 0.05 ?m or more and 2 ?m or less.
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: March 17, 2020
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yosuke Horiuchi, Shinya Sakurada, Keiko Okamoto, Masaya Hagiwara, Tsuyoshi Kobayashi, Masaki Endo, Tadahiko Kobayashi
  • Patent number: 10593447
    Abstract: In one embodiment, a permanent magnet includes a sintered compact including: a composition expressed by a composition formula: RpFeqMrCusCo100-p-q-r-s (R is at least one element selected from rare-earth elements, M is at least one element selected from Zr, Ti, and Hf, 10?p?13.3 at %, 25?q?40 at %, 0.87?r?5.4 at %, and 3.5?s?13.5 at %); and a metallic structure having a main phase including a Th2Zn17 crystal phase, and an R-M-rich phase containing the element R whose concentration is 1.2 times or more an R concentration in the main phase and the element M whose concentration is 1.2 times or more an M concentration in the main phase. A volume fraction of the R-M-rich phase in the metallic structure is from 0.2% to 15%.
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: March 17, 2020
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yosuke Horiuchi, Shinya Sakurada, Keiko Okamoto, Masaya Hagiwara, Tsuyoshi Kobayashi, Masaki Endo, Tadahiko Kobayashi
  • Patent number: 10480052
    Abstract: A permanent magnet of the embodiment includes: a composition represented by a composition formula: R(FepMqCurCtCo1-p-q-r-t)z (R is at least one element selected from rare-earth elements, M is at least one element selected from Ti, Zr and Hf, 0.27?p?0.45, 0.01?q?0.05, 0.01?r?0.1, 0.002?t?0.03, and 6?z?9); and a metallic structure including a main phase containing a Th2Zn17 crystal phase, and a sub phase of the element M having an element M concentration of 30 atomic % or more. The sub phase of the element M precipitates in the metallic structure. A ratio of a circumferential length to a precipitated area of the sub phase of the element M is 1 or more and 10 or less.
    Type: Grant
    Filed: September 1, 2016
    Date of Patent: November 19, 2019
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.
    Inventors: Masaya Hagiwara, Shinya Sakurada, Yosuke Horiuchi, Tadahiko Kobayashi, Tsuyoshi Kobayashi, Masaki Endo, Naoyuki Sanada, Masami Okamura, Takao Sawa, Keiichi Fuse, Satoru Habu
  • Patent number: 10304600
    Abstract: In one embodiment, a permanent magnet includes a sintered compact having a composition represented by the composition formula: RpFeqMrCusCo100-p-q-r-s (where R is at least one element selected from rare earth elements, M is at least one element selected from Zr, Ti, and Hf, p is 10.5 atomic % or more and 12.5 atomic % or less, q is 24 atomic % or more and 40 atomic % or less, r is 0.88 atomic % or more and 4.5 atomic % or less, and s is 3.5 atomic % or more and 10.7 atomic % or less. The sintered compact has a structure having crystal grains constituted of a main phase including a Th2Zn17 crystal phase, and a crystal grain boundary. In the structure of the sintered compact, an average grain diameter of the crystal grains is 25 micrometer or more, and a volume fraction of the crystal grain boundary is 14% or less.
    Type: Grant
    Filed: February 2, 2015
    Date of Patent: May 28, 2019
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yosuke Horiuchi, Shinya Sakurada, Keiko Okamoto, Masaya Hagiwara, Tsuyoshi Kobayashi, Masaki Endo, Tadahiko Kobayashi, Kazuomi Yoshima
  • Patent number: 9773592
    Abstract: A permanent magnet of an embodiment includes: a composition represented by a composition formula: R(FepMqCurCo1-p-q-r)z, where R is at least one element selected from rare-earth elements, M is at least one element selected from Zr, Ti, and Hf, and relations of 0.3?p?0.4, 0.01?q?0.05, 0.01?r?0.1, and 7?z?8.5 (atomic ratio) are satisfied; and a structure including a cell phase having a Th2Zn17 crystal phase, and a cell wall phase existing to surround the cell phase. An average magnetization of the cell wall phase is 0.2 T or less.
    Type: Grant
    Filed: March 18, 2015
    Date of Patent: September 26, 2017
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Shinya Sakurada, Yosuke Horiuchi, Keiko Okamoto, Masaya Hagiwara, Tsuyoshi Kobayashi, Masaki Endo, Tadahiko Kobayashi
  • Publication number: 20170271060
    Abstract: A permanent magnet of an embodiment includes a sintered compact, the sintered compact including: a composition expressed by RpFeqMrCusCo100-p-q-r-s, (R is at least one element selected from rare earth elements, M is at least one element selected from Zr, Ti, and Hf, 10.5?p?12.5 atomic %, 24?q?40 atomic %, 0.88?r?4.5 atomic %, and 3.5?s?10.7 atomic %); and a structure having crystal grains each composed of a main phase including a Th2Zn17 crystal phase, and a crystal grain boundary of the crystal grains. An average crystal grain diameter of the crystal grains is 50 ?m or more and 100 ?m or less, and a ratio of the crystal grains having a crystal grain diameter of 50 ?m or more is 75% or more.
    Type: Application
    Filed: February 23, 2017
    Publication date: September 21, 2017
    Inventors: Toshihide Takahashi, Shinya Sakurada, Yosuke Horiuchi, Masaya Hagiwara, Tadahiko Kobayashi
  • Publication number: 20170271929
    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: Application
    Filed: February 21, 2017
    Publication date: September 21, 2017
    Inventors: Yosuke Horiuchi, Shinya Sakurada, Masaya Hagiwara, Tadahiko Kobayashi, Toshihide Takahashi
  • Patent number: 9715956
    Abstract: The magnet has a composition expressed by RpFeqMrCutCo100-p-q-r-t. The magnet has a metallic structure including a main phase having a Th2Zn17 crystal phase. The main phase has crystal grains. 5% or less of the crystal grains having a grain diameter equal to or smaller than 10 ?m, 40% or less of the crystal grains having crystal orientation perpendicular to (001) plane of the Th2Zn17 crystal phase in a direction deviated 30 degrees or more relative to an axis of easy magnetization.
    Type: Grant
    Filed: March 11, 2015
    Date of Patent: July 25, 2017
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yosuke Horiuchi, Shinya Sakurada, Masaya Hagiwara, Tsuyoshi Kobayashi, Tadahiko Kobayashi
  • Patent number: 9714458
    Abstract: The embodiments provide a high-performance permanent magnet. The permanent magnet includes a sintered body having a composition expressed by a composition formula RpFeqMrCutCo100-p-q-r-t, with carbon in a range from 50 mass ppm to 1500 mass ppm. The sintered body also includes a metallic structure. The metallic structure includes a main phase having a Th2Zn17 crystal phase, and a secondary phase having a carbide phase of the M element of the composition formula. A ratio (I2/I1) of a maximum intensity I2 of a diffraction peak at an angle 2? in a range from 37.5 degrees to 38.5 degrees to a maximum intensity I1 of a diffraction peak at the angle 2? in a range from 32.5 degrees to 33.5 degrees is greater than 25 but no greater than 80 in an X-ray diffraction pattern obtained by applying an X-ray diffraction measuring method to the sintered body.
    Type: Grant
    Filed: March 11, 2015
    Date of Patent: July 25, 2017
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yosuke Horiuchi, Shinya Sakurada, Masaya Hagiwara, Tsuyoshi Kobayashi, Tadahiko Kobayashi, Naoyuki Sanada
  • Publication number: 20170162304
    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: Application
    Filed: January 24, 2017
    Publication date: June 8, 2017
    Inventors: Yosuke Horiuchi, Shinya Sakurada, Masaya Hagiwara, Tsuyoshi Kobayashi, Tadahiko Kobayashi
  • Patent number: 9618239
    Abstract: The magnetic refrigerating device according to one embodiment includes a fixed container filled with a refrigerant, the fixed container including a magnetic material container that is filled with a magnetic material and that can move in the fixed container and an elastic member provided at the end of the magnetic material container. The magnetic refrigerating device also includes a magnetic-field applying/removing mechanism that is provided at the outside of the fixed container, and that can apply and remove a magnetic field to and from the magnetic material and can generate a magnetic torque to the magnetic material container in moving direction of the magnetic material container.
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: April 11, 2017
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tadahiko Kobayashi, Akiko Saito, Shiori Kaji
  • Publication number: 20170002445
    Abstract: A permanent magnet of the embodiment includes: a composition represented by a composition formula: R(FepMqCurCtCo1-p-q-r-t)z (R is at least one element selected from rare-earth elements, M is at least one element selected from Ti, Zr and Hf, 0.27?p?0.45, 0.01?q?0.05, 0.01?r?0.1, 0.002?t?0.03, and 6?z?9); and a metallic structure including a main phase containing a Th2Zn17 crystal phase, and a sub phase of the element M having an element M concentration of 30 atomic % or more. The sub phase of the element M precipitates in the metallic structure. A ratio of a circumferential length to a precipitated area of the sub phase of the element M is 1 or more and 10 or less.
    Type: Application
    Filed: September 1, 2016
    Publication date: January 5, 2017
    Inventors: Masaya Hagiwara, Shinya Sakurada, Yosuke Horiuchi, Tadahiko Kobayashi, Tsuyoshi Kobayashi, Masaki Endo, Naoyuki Sanada, Masami Okamura, Takao Sawa, Keiichi Fuse, Satoru Habu
  • Patent number: 9502164
    Abstract: A permanent magnet includes: a composition expressed by a composition formula: RpFeqMrCutCo100-p-q-r-t (R is at least one element selected from rare-earth elements, M is at least one element selected from Zr, Ti, and Hf, 10.5?p?12.5 at %, 23?q?40 at %, 0.88?r?4.5 at %, 4.5?t?10.7 at %); and a metal structure containing a cell phase having a Th2Zn17 crystal phase, a cell wall phase, an M-rich platelet phase formed vertically to a c-axis of the Th2Zn17 crystal phase, and a Cu-rich platelet phase formed along the M-rich platelet phase.
    Type: Grant
    Filed: March 18, 2015
    Date of Patent: November 22, 2016
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yosuke Horiuchi, Shinya Sakurada, Keiko Okamoto, Masaya Hagiwara, Tsuyoshi Kobayashi, Masaki Endo, Tadahiko Kobayashi
  • Patent number: 9502165
    Abstract: A permanent magnet includes: a composition expressed by a composition formula: RpFeqMrCutCo100-p-q-r-t (R is at least one element selected from rare-earth elements, M is at least one element selected from Zr, Ti, and Hf, 10.5?p?12.5 at %, 23?q?40 at %, 0.88?r?4.5 at %, 4.5?t?10.7 at %); and a metal structure containing a Th2Zn17 crystal phase and a Cu-rich phase having a Cu concentration higher than that of the Th2Zn17 crystal phase. In a cross section including a c-axis of the Th2Zn17 crystal phase, a number of intersections of the Cu-rich phases existing in an area of 1 ?m square is 10 or more.
    Type: Grant
    Filed: March 18, 2015
    Date of Patent: November 22, 2016
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yosuke Horiuchi, Shinya Sakurada, Keiko Okamoto, Masaya Hagiwara, Tsuyoshi Kobayashi, Masaki Endo, Tadahiko Kobayashi
  • Patent number: 9383125
    Abstract: Magnetic materials, having: a composition represented by a general formula: (R1?yXy)x(Fe1?aMa)100?x where, R is at least one of element selected from the group consisting of La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb and Y, X is at least one of element selected from the group consisting of Ti, Zr and Hf, M is at least one of element selected from the group consisting of V, Cr, Mn, Ni, Cu, Zn, Nb, Mo, Ta, W, Al, Si, Ga and Ge, x is a value satisfying 4?x?20 atomic %, y is a value satisfying 0.01?y?0.9, and a is a value satisfying 0?a?0.2, wherein the magnetic material includes a Th2Ni17 crystal phase or a TbCu7 crystal phase as a main phase, that are useful for magnetic refrigeration.
    Type: Grant
    Filed: January 6, 2014
    Date of Patent: July 5, 2016
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Shinya Sakurada, Akiko Saito, Tadahiko Kobayashi, Hideyuki Tsuji
  • Publication number: 20160155548
    Abstract: The magnet has a composition expressed by RpFeqMrCutCo100-p-q-r-t. The magnet has a metallic structure including a main phase having a Th2Zn17 crystal phase. The main phase has crystal grains. 5% or less of the crystal grains having a grain diameter equal to or smaller than 10 ?m, 40% or less of the crystal grains having crystal orientation perpendicular to (001) plane of the Th2Zn17 crystal phase in a direction deviated 30 degrees or more relative to an axis of easy magnetization.
    Type: Application
    Filed: March 11, 2015
    Publication date: June 2, 2016
    Inventors: Yosuke Horiuchi, Shinya Sakurada, Masaya Hagiwara, Tsuyoshi Kobayashi, Tadahiko Kobayashi