Patents by Inventor Kei Osawa

Kei Osawa 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).

  • Publication number: 20180030584
    Abstract: A thermal barrier coating (100) includes a heat-resistant alloy substrate which is used in a turbine member and a ceramic layer (300) which is formed on the heat-resistant alloy substrate and in which vertical cracks (C) extending in a thickness direction are dispersed in a surface direction and a plurality of pores (P) are included on the inside. Thermal spray particles composed of YbSZ having a particle-size distribution in which a 50% particle diameter in a cumulative particle-size distribution is 40 ?m to 100 ?m are thermally sprayed at a thermal spray distance of 80 mm or less, the vertical cracks (C) are dispersed at a pitch of 0.5 cracks/mm to 40 cracks/mm in the surface direction, and the ceramic layer (300) of which a porosity attributable to the vertical cracks (C) and the pores (P) combined is 4% to 15% is formed.
    Type: Application
    Filed: February 5, 2016
    Publication date: February 1, 2018
    Inventors: Yoshiyuki INOUE, Taiji TORIGOE, Daisuke KUDO, Masamitsu KUWABARA, Kei OSAWA, Yoshitaka UEMURA, Naotoshi OKAYA
  • Publication number: 20180023178
    Abstract: The present invention provides a production method for thermal spray particles forming a ceramic layer in which vertical cracks extending in a thickness direction are dispersed in a surface direction and which includes a plurality of pores inside. The production method for thermal spray particles includes adjusting a solid content concentration of slurry (13) to 75 wt % to 85 wt %, supplying the slurry (13) to a disk-shaped atomizer (12) of a spray drying device (10), setting a protrusion speed at which the slurry (13) protrudes from the atomizer (12) to 60 m/second to 90 m/second. and performing a heat treatment on thermal spray particle bodies (22) formed by drying the slurry (13) to produce thermal spray particles composed of YbSZ in which a 50% particle diameter in a cumulative particle-size distribution is 40 ?m to 100 ?m.
    Type: Application
    Filed: February 5, 2016
    Publication date: January 25, 2018
    Inventors: Yoshiyuki INOUE, Taiji TORIGOE, Daisuke KUDO, Masamitsu KUWABARA, Kei OSAWA, Yoshitaka UEMURA, Naotoshi OKAYA
  • Patent number: 8720056
    Abstract: A turbine rotor blade repair method which reduces the occurrence of cracks due to welding is provided. A turbine rotor blade repair method for repairing damage of a fin at a tip of a turbine rotor blade includes overlaying a damaged portion of the fin with metal by welding (step S2); peening on a boundary region between the fin and the overlaying metal (step S4); and after the peening, performing solution treatment to repair the damage of the fin of the turbine rotor blade (step S6).
    Type: Grant
    Filed: February 9, 2009
    Date of Patent: May 13, 2014
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Masahiko Mega, Kei Osawa, Masahiko Onda
  • Patent number: 8607604
    Abstract: A bolt has a male screw with a surface hardening portion that has an increased surface hardness and that is applied with a compressive residual stress. The male screw is formed by cutting the bolt, and performing a process to provide at least on the surface of the male screw of the bolt the surface hardening portion that has increased hardness and that is applied with a compressive residual stress. As a result, the fatigue resistance of the male screw is improved and the bolt is effective for use in a portion where the male screw is subject to a repetitive stress.
    Type: Grant
    Filed: July 8, 2011
    Date of Patent: December 17, 2013
    Assignee: Mitsubishi Heavy Industries
    Inventors: Norikazu Tezuka, Kazuharu Hirokawa, Keisuke Ihara, Kei Osawa, Hiroshi Ishikawa, Taiji Torigoe, Ryuichi Yamamoto, Yukihiro Hashimoto, Nobuyuki Izutsu, Koji Takahashi
  • Publication number: 20110268533
    Abstract: A bolt has a male screw with a surface hardening portion that has an increased surface hardness and that is applied with a compressive residual stress. The male screw is formed by cutting the bolt, and performing a process to provide at least on the surface of the male screw of the bolt the surface hardening portion that has increased hardness and that is applied with a compressive residual stress. As a result, the fatigue resistance of the male screw is improved and the bolt is effective for use in a portion where the male screw is subject to a repetitive stress.
    Type: Application
    Filed: July 8, 2011
    Publication date: November 3, 2011
    Inventors: Norikazu TEZUKA, Kazuharu Hirokawa, Keisuke Ihara, Kei Osawa, Hiroshi Ishikawa, Taiji Torigoe, Ryuichi Yamamoto, Yukihiro Hashimoto, Nobuyuki Izutsu, Koji Takahashi
  • Publication number: 20100205805
    Abstract: A turbine rotor blade repair method which reduces the occurrence of cracks due to welding is provided. A turbine rotor blade repair method for repairing damage of a fin at a tip of a turbine rotor blade includes overlaying a damaged portion of the fin with metal by welding (step S2); peening on a boundary region between the fin and the overlaying metal (step S4); and after the peening, performing solution treatment to repair the damage of the fin of the turbine rotor blade (step S6).
    Type: Application
    Filed: February 9, 2009
    Publication date: August 19, 2010
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Masahiko Mega, Kei Osawa, Masahiko Onda
  • Publication number: 20090003968
    Abstract: The present invention provides a surface hardening portion 11 that has increased surface hardness and that is applied with a compressive residual stress, at least on the surface of a male screw 10 of a bolt 1. The present invention includes the steps of cutting to form the male screw 10 of the bolt 1, and processing to provide at least on the surface of the male screw 10 of the bolt 1 the surface hardening portion 11 that has increased hardness and that is applied with a compressive residual stress. As a result, the present invention can improve the fatigue resistance of the male screw 10 and the bolt is effective as a bolt to be used in a portion where the male screw 10 is subject to a repetitive stress.
    Type: Application
    Filed: January 25, 2007
    Publication date: January 1, 2009
    Inventors: Norikazu Tezuka, Kazuharu Hirokawa, Keisuke Ihara, Kei Osawa, Hiroshi Ishikawa, Taiji Torigoe, Ryuichi Yamamoto, Yukihiro Hashimoto, Nobuyuki Izutsu, Koji Takahashi