Patents by Inventor Kinya Aota
Kinya Aota 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).
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Patent number: 11634805Abstract: An austenitic stainless steel includes a mixed grain structure composed of a columnar crystal having an average crystal grain size of 20 ?m or less and an equiaxed crystal having an average crystal grain size of 5.0 ?m or less, in which an area proportion of the columnar crystal in the mixed grain structure is 20% or more, and an average crystal grain size of the whole mixed grain structure is 5.0 ?m or less. Accordingly, it is possible to provide a material having excellent irradiation resistance and mechanical properties.Type: GrantFiled: March 11, 2019Date of Patent: April 25, 2023Assignee: Hitachi, Ltd.Inventors: Takahiro Ishizaki, Yusaku Maruno, Kinya Aota, Yingjuan Yang
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Patent number: 11141791Abstract: An object of the invention is to provide: an alloy article that has excellent homogeneity in the alloy composition and microstructure as well as significant shape controllability, using an HEA with significant mechanical strength and high corrosion resistance; a method for manufacturing the alloy article; and a product using the alloy article. There is provided an alloy article comprising: Co, Cr, Fe, Ni, and Ti elements, each element in content of 5 to 35 atomic %; more than 0 atomic % to 8 atomic % of Mo %; and remainder substances of unavoidable impurities. And, ultrafine particles with an average diameter of 40 nm or less are dispersedly precipitated in matrix phase crystals of the alloy article.Type: GrantFiled: October 25, 2016Date of Patent: October 12, 2021Assignee: HITACHI METALS, LTD.Inventors: Tadashi Fujieda, Mamoru Hirota, Kosuke Kuwabara, Kinya Aota, Takahiko Kato, Akihiko Chiba, Yuichiro Koizumi, Kenta Yamanaka, Seiichi Watanabe
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Publication number: 20210189537Abstract: An austenitic stainless steel includes a mixed grain structure composed of a columnar crystal having an average crystal grain size of 20 ?m or less and an equiaxed crystal having an average crystal grain size of 5.0 ?m or less, in which an area proportion of the columnar crystal in the mixed grain structure is 20% or more, and an average crystal grain size of the whole mixed grain structure is 5.0 ?m or less. Accordingly, it is possible to provide a material having excellent irradiation resistance and mechanical properties.Type: ApplicationFiled: March 11, 2019Publication date: June 24, 2021Inventors: Takahiro ISHIZAKI, Yusaku MARUNO, Kinya AOTA, Yingjuan YANG
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Publication number: 20210101332Abstract: A manufacturing system of an additive manufacturing body is provided, by which the accuracy of evaluating a defect during additive manufacturing and the quality of the body can be improved. A manufacturing system of an additive manufacturing body of the present invention includes: an additive manufacturing device; an inspection device having a camera for photographing the powder layer or the solidified layer; and a control device that controls the additive manufacturing device and the inspection device, in which: the camera can photograph the powder layer for each powder layer forming step that is performed repeatedly, or can photograph the solidified layer for each solidified layer forming step that is performed repeatedly; and the control device selects a photographing condition of the camera according to the conditions of the additive manufacturing process.Type: ApplicationFiled: February 4, 2019Publication date: April 8, 2021Applicant: HITACHI, LTD.Inventors: Hirotsugu KAWANAKA, Kinya AOTA, Yingjuan YANG, Atsuhiko OONUMA
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Patent number: 10796807Abstract: A nuclear reactor fuel rod is a fuel rod for a light-water reactor. The nuclear reactor fuel rod includes a fuel cladding tube and an end plug, both of which are formed of a silicon carbide material. A bonding portion between the fuel cladding tube and the end plug is formed by brazing with a predetermined metal bonding material interposed, and/or by diffusion bonding. The predetermined metal bonding material has a solidus temperature of 1200° C. or higher. An outer surface of the bonding portion, and a portion of an outer surface of the fuel cladding tube and the end plug, which is adjacent to the outer surface of the bonding portion are covered by bonding-portion coating formed of a predetermined coating metal. The predetermined metal bonding material and the predetermined coating metal have an average linear expansion coefficient which is less than 10 ppm/K.Type: GrantFiled: November 26, 2014Date of Patent: October 6, 2020Assignee: HITACHI, LTD.Inventors: Ryou Ishibashi, Kinya Aota, Xudong Zhang, Hideki Kita, Seiji Yamashita
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Patent number: 10787725Abstract: An object of the invention is to provide: an HEA article that has excellent homogeneity in the alloy composition and microstructure as well as significant shape controllability, using an HEA with significant mechanical strength and high corrosion resistance; a method for manufacturing the HEA article; and a product using the HEA article. There is provided an HEA article comprising: Co, Cr, Fe, Ni, and Ti elements, each element in content of 5 to 35 atomic %; more than 0 atomic % to 8 atomic % of Mo %; and remainder substances of unavoidable impurities.Type: GrantFiled: November 8, 2016Date of Patent: September 29, 2020Assignee: Hitachi Metals, Ltd.Inventors: Tadashi Fujieda, Kousuke Kuwabara, Mamoru Hirota, Kinya Aota, Takahiko Kato, Akihiko Chiba, Yuichiro Koizumi, Kenta Yamanaka
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Publication number: 20200222982Abstract: There is provided an additive manufacturing apparatus that can effectively removing fume even in a vacuum state. An additive manufacturing apparatus 1 includes a fume capturing mechanism 8 that is provided to be movable in a space R defined between a beam source 9 and a stage 51, and that captures fume F generated due to melting of a powder P.Type: ApplicationFiled: March 23, 2018Publication date: July 16, 2020Inventor: Kinya AOTA
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Patent number: 10702944Abstract: An alloy structure has an arbitrary shape dimension which has high uniformity in the distribution of the element composition. The alloy structure contains Fe and at least four elements, which are selected from the group consisting of elements from atomic number 13 to atomic number 79 included in Group 3 to Group 16 of the periodic table of the elements and have a ratio of the atomic radius to an Fe atom of 0.83 or more but 1.17 or less, each of Fe and the four elements is contained in an atomic concentration range of 5 at % or more but 30 at % or less, a difference in atomic concentration between at least four elements among the at least four elements and Fe is in a range of less than 3 at %, and the alloy structure has, a column crystal in which the at least four elements and Fe are solid-dissolved.Type: GrantFiled: July 17, 2015Date of Patent: July 7, 2020Assignee: HITACHI METALS, LTD.Inventors: Takahiko Kato, Kousuke Kuwabara, Tadashi Fujieda, Kinya Aota, Isamu Takahashi, Hiroyuki Satake, Kenji Yamaga, Hajime Murakami
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Patent number: 10576538Abstract: An alloy structure which has high uniformity in the distribution of the element composition and the mechanical strength and excellent high-temperature strength and corrosion resistance, contains Fe and at least four elements, which are selected from the group consisting of elements from atomic number 13 to atomic number 79, included in Group 3 to Group 16 of the periodic table of the elements, and have a ratio of the atomic radius to an Fe atom of 0.83 or more but 1.17 or less, each of the elements in an atomic concentration range of 5 at % or more but 30 at % or less, a difference in atomic concentration among the at least four elements and Fe is in a range of less than 3 at %, and the alloy structure has, as a main crystal, a column crystal in which the at least four elements and Fe are solid-dissolved.Type: GrantFiled: July 17, 2015Date of Patent: March 3, 2020Assignee: HITACHI METALS, LTD.Inventors: Takahiko Kato, Kousuke Kuwabara, Tadashi Fujieda, Kinya Aota, Isamu Takahashi, Kenji Yamaga, Hiroyuki Satake, Hajime Murakami
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Publication number: 20190299289Abstract: The purpose of the present invention is to obtain an additive manufacturing device capable of manufacturing while reducing the flow rate of Ar gas. This additive manufacturing device is characterized in that a reduced-pressure atmosphere is maintained in a manufacturing area, an inert gas is supplied to the manufacturing area, the proportion of gaseous impurities in the manufacturing area is detected, and in case where the proportion of gaseous impurities exceeds a threshold value, the supply of inert gas is reduced.Type: ApplicationFiled: March 8, 2017Publication date: October 3, 2019Inventor: Kinya AOTA
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Publication number: 20190047049Abstract: An object of the invention is to provide: an alloy article that has excellent homogeneity in the alloy composition and microstructure as well as significant shape controllability, using an HEA with significant mechanical strength and high corrosion resistance; a method for manufacturing the alloy article; and a product using the alloy article. There is provided an alloy article comprising: Co, Cr, Fe, Ni, and Ti elements, each element in content of 5 to 35 atomic %; more than 0 atomic % to 8 atomic % of Mo %; and remainder substances of unavoidable impurities. And, ultrafine particles with an average diameter of 40 nm or less are dispersedly precipitated in matrix phase crystals of the alloy article.Type: ApplicationFiled: October 25, 2016Publication date: February 14, 2019Applicant: HITACHI METALS, LTD.Inventors: Tadashi FUJIEDA, Mamoru HIROTA, Kosuke KUWABARA, Kinya AOTA, Takahiko KATO, Akihiko CHIBA, Yuichiro KOIZUMI, Kenta YAMANAKA, Seiichi WATANABE
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Publication number: 20180363104Abstract: An object of the invention is to provide: an HEA article that has excellent homogeneity in the alloy composition and microstructure as well as significant shape controllability, using an HEA with significant mechanical strength and high corrosion resistance; a method for manufacturing the HEA article; and a product using the HEA article. There is provided an HEA article comprising: Co, Cr, Fe, Ni, and Ti elements, each element in content of 5 to 35 atomic %; more than 0 atomic % to 8 atomic % of Mo %; and remainder substances of unavoidable impurities.Type: ApplicationFiled: November 8, 2016Publication date: December 20, 2018Applicant: HITACHI METALS, LTD.Inventors: Tadashi FUJIEDA, Kousuke KUWABARA, Mamoru HIROTA, Kinya AOTA, Takahiko KATO, Akihiko CHIBA, Yuichiro KOIZUMI, Kenta YAMANAKA
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Publication number: 20170330638Abstract: A nuclear reactor fuel rod is a fuel rod for a light-water reactor. The nuclear reactor fuel rod includes a fuel cladding tube and an end plug, both of which are formed of a silicon carbide material. A bonding portion between the fuel cladding tube and the end plug is formed by brazing with a predetermined metal bonding material interposed, and/or by diffusion bonding. The predetermined metal bonding material has a solidus temperature of 1200° C. or higher. An outer surface of the bonding portion, and a portion of an outer surface of the fuel cladding tube and the end plug, which is adjacent to the outer surface of the bonding portion are covered by bonding-portion coating formed of a predetermined coating metal. The predetermined metal bonding material and the predetermined coating metal have an average linear expansion coefficient which is less than 10 ppm/K.Type: ApplicationFiled: November 26, 2014Publication date: November 16, 2017Applicant: Hitachi, Ltd.Inventors: Ryou ISHIBASHI, Kinya AOTA, Xudong ZHANG, Hideki KITA, Seiji YAMASHITA
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Patent number: 9748554Abstract: An electric storage device includes a container which houses an electric generating element, and a sealing plug which seals a liquid injecting hole into which an electrolyte is injected. The liquid injecting hole is provided in a bottom surface of a recessed portion provided to be recessed on one side surface of the container. The sealing plug includes an inserting portion to be inserted into the liquid injecting hole and a fitting portion to be fitted into the recessed portion. At least either a rim portion of the fitting portion or an opening rim portion of the recessed portion is provided with a plurality of plastic deformation portions.Type: GrantFiled: April 12, 2013Date of Patent: August 29, 2017Assignee: Hitachi Automotive Systems, Ltd.Inventors: Sho Saimaru, Kinya Aota, Kouichi Kajiwara
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Publication number: 20170209954Abstract: An alloy structure has an arbitrary shape dimension which has high uniformity in the distribution of the element composition. The alloy structure contains Fe and at least four elements, which are selected from the group consisting of elements from atomic number 13 to atomic number 79 included in Group 3 to Group 16 of the periodic table of the elements and have a ratio of the atomic radius to an Fe atom of 0.83 or more but 1.17 or less, each of Fe and the four elements is contained in an atomic concentration range of 5 at % or more but 30 at % or less, a difference in atomic concentration between at least four elements among the at least four elements and Fe is in a range of less than 3 at %, and the alloy structure has, a column crystal in which the at least four elements and Fe are solid-dissolved.Type: ApplicationFiled: July 17, 2015Publication date: July 27, 2017Applicant: HITACHI, LTD.Inventors: Takahiko KATO, Kousuke KUWABARA, Tadashi FUJIEDA, Kinya AOTA, Isamu TAKAHASHI, Hiroyuki SATAKE, Kenji YAMAGA, Hajime MURAKAMI
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Publication number: 20170209922Abstract: An alloy structure which has high uniformity in the distribution of the element composition and the mechanical strength and excellent high-temperature strength and corrosion resistance, contains Fe and at least four elements, which are selected from the group consisting of elements from atomic number 13 to atomic number 79, included in Group 3 to Group 16 of the periodic table of the elements, and have a ratio of the atomic radius to an Fe atom of 0.83 or more but 1.17 or less, each of the elements in an atomic concentration range of 5 at % or more but 30 at % or less, a difference in atomic concentration among the at least four elements and Fe is in a range of less than 3 at %, and the alloy structure has, as a main crystal, a column crystal in which the at least four elements and Fe are solid-dissolved.Type: ApplicationFiled: July 17, 2015Publication date: July 27, 2017Applicant: HITACHI, LTD.Inventors: Takahiko KATO, Kousuke KUWABARA, Tadashi FUJIEDA, Kinya AOTA, Isamu TAKAHASHI, Kenji YAMAGA, Hiroyuki SATAKE, Hajime MURAKAMI
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Publication number: 20160325377Abstract: An object of the present invention is to reduce spatter generation by stabilizing a keyhole in a laser welding method. A welded joint in which a plurality of workpieces are welded by irradiation with a laser beam, wherein the following formulae 1 to 3 are satisfied, b/a?0.6—(formula 1), h/d?1.0—(formula 2), and h/a<3.0—(formula 3), where a is a surface width of a weld bead formed across the plurality of workpieces, h is a maximum penetration depth of the weld bead, b is a penetration width of the weld bead at a position where a penetration depth of the weld bead is h/2, and d is the penetration depth at a center position of the weld bead.Type: ApplicationFiled: January 17, 2014Publication date: November 10, 2016Inventors: Xudong ZHANG, Kinya AOTA, Masanori MIYAGI
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Publication number: 20160164066Abstract: An electric storage device includes a container which houses an electric generating element, and a sealing plug which seals a liquid injecting hole into which an electrolyte is injected. The liquid injecting hole is provided in a bottom surface of a recessed portion provided to be recessed on one side surface of the container. The sealing plug includes an inserting portion to be inserted into the liquid injecting hole and a fitting portion to be fitted into the recessed portion. At least either a rim portion of the fitting portion or an opening rim portion of the recessed portion is provided with a plurality of plastic deformation portions.Type: ApplicationFiled: April 12, 2013Publication date: June 9, 2016Inventors: Sho SAIMARU, Kinya AOTA, Kouichi KAJIWARA
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Patent number: 9065124Abstract: A battery pack with a reduced resistance connection arrangement in which battery cells are arranged in rows in an insulating case and an electrode of each battery cell is coupled to an electrode of another battery cell through a connecting metallic plate. The connecting metallic plate is made of copper and is disposed on a positive electrode of one battery cell and a negative electrode of another battery cell to form a lap joint. Welds are formed in predetermined positions on the connecting metallic plate above the positive and negative electrodes by arc spot welding. The electrodes are formed of nickel-coated steel. The depth h of weld penetration in the weld is greater than the thickness T1 of the connecting metallic plate and smaller than the thickness T1 plus the thickness T2 of one of the electrodes, that is, T1<h?(T1+T2×4/5).Type: GrantFiled: November 9, 2007Date of Patent: June 23, 2015Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Shoji Imanaga, Kinya Aota, Yoshihisa Tsurumi, Masuhiro Onishi
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Patent number: 8673470Abstract: A secondary cell includes: an electrode roll in which a positive foil on which a positive-electrode material is coated and a negative foil on which a negative-electrode material is coated are winded through a separator into a flat shape around a winding core; a case in which the electrode roll is housed; a cover which seals the case; a positive terminal and a negative terminal provided on the cover; a positive electrode current collector plate that is electrically connected to the positive foil of the electrode roll and the positive terminal and held by the cover; and a negative electrode current collector plate that is electrically connected to the negative foil of the electrode roll and the negative terminal and held by the cover. The positive electrode current collector plate and the negative electrode current collector plate are each connected to the winding core.Type: GrantFiled: February 7, 2011Date of Patent: March 18, 2014Assignee: Hitachi Vehicle Energy, Ltd.Inventors: Kinya Aota, Toshiro Fujita, Kouichi Kajiwara, Masaaki Iwasa