Patents by Inventor Takahiro Izumi
Takahiro Izumi 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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Publication number: 20200206849Abstract: This aluminum alloy brazing sheet is provided with: a core material comprising 2.0 mass % or less (including 0 mass %) of Mg and a remainder of Al and unavoidable impurities; and a brazing material comprising Si, Bi, Mg, and a remainder of Al and unavoidable impurities. The aluminum alloy brazing sheet satisfies the expressions 3?CSi?13, 0.13CMg?0.3?CBi?0.58CMg0.45, CMg-b?0.1, and 0.2?CMg?1.1 when the Si content of the brazing material is denoted by CSi, the Bi content of the brazing material is denoted by CBi, the Mg content of the brazing material is denoted by CMg-b, the Mg content of the core material is denoted by CMg-c, and CMg=CMg-b+CMg-c/2.Type: ApplicationFiled: May 24, 2018Publication date: July 2, 2020Applicants: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.), DENSO CORPORATIONInventors: Takahiro IZUMI, Akihiro TSURUNO, Shimpei KIMURA, Yuji SHIBUYA, Takahiro SHINODA, Shogo YAMADA, Shingo OONO
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Publication number: 20200086430Abstract: Provided is a brazing method for an aluminum alloy brazing sheet provided with a core material and a brazing material in which the Si content of the brazing material is denoted by CSi, the Bi content of the brazing material is denoted by CBi, the Mg content of the brazing material is denoted by CMg-b, the Mg content of the core material is denoted by CMg-c, CMg=CMg-b+CMg-c/2, and an aluminum alloy brazing sheet satisfying 3?CSi?13, 0.13CMg?0.3?CBi?0.58CMg0.45, CMg-b?0.1, and 0.2?CMg?1.1 is brazed in an inert gas atmosphere at a heating temperature of 560-620° C. without using flux.Type: ApplicationFiled: May 24, 2018Publication date: March 19, 2020Applicants: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.), DENSO CORPORATIONInventors: Takahiro IZUMI, Akihiro TSURUNO, Shimpei KIMURA, Yuji SHIBUYA, Takahiro SHINODA, Shogo YAMADA, Shingo OONO
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Patent number: 10478925Abstract: The present invention provides a brazing filler material in which the formation of coarse Si particles is suppressed, and a brazing sheet using the same. The brazing filler material includes Si: 3.5% by mass or more and 13.0% by mass or less, Ti: 0.001% by mass or more and 0.05% by mass or less, V: more than 0.0005% by mass and 0.05% by mass or less, and B: 0.001% by mass or less (excluding 0% by mass), with the balance being Al and inevitable impurities, and the value of V/Ti, which is a value obtained by dividing the V content (% by mass) by the Ti content (% by mass) is 0.05 or more and 5 or less.Type: GrantFiled: February 23, 2016Date of Patent: November 19, 2019Assignee: Kobe Steel, Ltd.Inventors: Takahiro Izumi, Kenichiro Yoshida, Akihiro Tsuruno
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Patent number: 10369665Abstract: This brazed structure includes a brazing sheet that has been brazed and that comprises: a core material comprising an aluminum alloy which contains 0.3-1.0 mass %, excluding 0.3 mass %, Si, 0.6-2.0 mass %, excluding 0.6 mass %, Mn, 0.3-1.0 mass %, excluding 0.3 mass %, Cu, and 0.15-0.5 mass %, excluding 0.15 mass %, Mg, with the remainder comprising Al and unavoidable impurities, and has an average crystal grain diameter of 50 ?m or larger and in which an Mg—Si intermetallic compound and an Al—Mg—Si—Cu intermetallic compound account for 40% or less of the grain boundaries; and, clad to the core material, a brazing material comprising an Al—Si alloy.Type: GrantFiled: March 24, 2014Date of Patent: August 6, 2019Assignees: KOBE STEEL, LTD., DENSO CORPORATIONInventors: Takahiro Izumi, Shimpei Kimura, Yuji Shibuya, Shoei Teshima, Hayaki Teramoto, Osamu Hakamata
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Patent number: 10315277Abstract: Provided is an aluminum alloy laminated plate having a sacrificial material cladded to at least one side surface of a core material, wherein the core material contains specified amounts of Mn, Si, Cu, Mg, Fe, and Ti, the balance is Al and inevitable impurities, the number density of dispersed particles having a particle size of 0.01-0.5 ?m is 10-100/?m3, and [(the total solid solution amount of Mg, Mn, Si, and Cu)/(the total added amount of Mg, Mn, Si, and Cu)] is 0.10 or more.Type: GrantFiled: March 24, 2015Date of Patent: June 11, 2019Assignee: KOBE STEEL, LTD.Inventors: Katsushi Matsumoto, Takahiro Izumi
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Patent number: 10307869Abstract: The present invention provides an aluminum alloy brazing sheet for electric resistance welding, which has high strength while being thinned and can reduce the occurrence of welding defects in the electric resistance welding. Disclosed is an aluminum alloy brazing sheet for electric resistance welding, including a core layer and a brazing filler layer cladded on at least one surface of the core layer, wherein the brazing filler layer is made of an aluminum alloy comprising Si: 5.5 to 12.0% by mass, and at least one of Na: 0.0003 to 0.0030% by mass and Sr: 0.0020 to 0.1000% by mass, with the balance being Al and inevitable impurities, wherein the brazing filler layer in a molten state at 650° C. exhibits a viscosity of 0.01 Pa·s or less.Type: GrantFiled: March 27, 2015Date of Patent: June 4, 2019Assignee: Kobe Steel, Ltd.Inventors: Shimpei Kimura, Toshiki Ueda, Takahiro Izumi, Yuji Shibuya
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Patent number: 10286496Abstract: A brazing sheet formed of an aluminum alloy and exhibiting excellent post-brazing strength, corrosion resistance and brazability with a thickness of less than 200 ?m is provided. The brazing sheet includes a core layer, a filler layer of an Al—Si based alloy on one side of the core layer, and a sacrificial layer on the other side of the core layer. The core layer includes more than 1.5 mass % and 2.5 mass % or less of Cu, 0.5 mass % to 2.0 mass % of Mn, Al, and inevitable impurities. The sacrificial layer includes 2.0 mass % to 7.0 mass % of Zn, more than 0.10 mass % and 3.0 mass % or less of Mg, Al, and inevitable impurities. The filler layer and the sacrificial layer each have a thickness of 15 ?m to 50 ?m. A total clad rate of the filler layer and the sacrificial layer is equal to or less than 50%.Type: GrantFiled: February 9, 2015Date of Patent: May 14, 2019Assignees: Kobe Steel, Ltd., DENSO CORPORATIONInventors: Shimpei Kimura, Akihiro Tsuruno, Takahiro Izumi, Yuji Shibuya, Hayaki Teramoto, Shoei Teshima, Manabu Hasegawa, Michiyasu Yamamoto
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Patent number: 10213881Abstract: A brazing sheet includes a core material containing an aluminum alloy including magnesium, a bonding material laminated on at least one side of the core material, and a flux layer. The flux layer is laminated on one side of the bonding material and includes a flux composition. The flux composition includes [A] a flux component containing KAlF4, and [B] AlF3. A substance mass S1 (mol) of magnesium in the bonding material when heated at 585° C., a substance mass S2 (mol) of [A] the flux component containing KAlF4 in the flux layer and a substance mass S3 (mol) of [B] AlF3 satisfy the specific expression.Type: GrantFiled: April 16, 2014Date of Patent: February 26, 2019Assignee: Kobe Steel, Ltd.Inventors: Nobuhiro Kobayashi, Toshiki Ueda, Shimpei Kimura, Takahiro Izumi
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Publication number: 20180347922Abstract: Disclosed is an aluminum composite material including an aluminum alloy material containing magnesium, and a bonding material formed by brazing using a flux, the bonding material being adapted to bond the aluminum alloy material thereto. In the aluminum composite material, the bonding material contains a magnesium-containing compound other than KMgF3 and MgF2. The present invention provides an aluminum composite material with satisfactory brazeability to an aluminum alloy material containing magnesium, a heat exchanger including the aluminum composite material, and a flux suitable for use in braze.Type: ApplicationFiled: August 8, 2018Publication date: December 6, 2018Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Nobuhiro KOBAYASHI, Motohiro HORIGUCHi, Koichi SAKAMOTO, Toshiki UEDA, Shimpei KIMURA, Takahiro IZUMi
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Publication number: 20180339374Abstract: This brazing flux composition for an aluminum alloy is characterized by containing [A] a flux component containing KAlF4 and [B] a fluoride that does not contain K and that contains elements other than group 1 elements and group 2 elements: being in a particle form of single component of [B] the fluoride; and the added amount (C) (mass %) of [B] the fluoride with respect to [A] the flux component and the average particle size (d) (?m) satisfying formula (1), 0.83C?0.19d<43??(1).Type: ApplicationFiled: August 3, 2018Publication date: November 29, 2018Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel. Ltd.)Inventors: Nobuhiro KOBAYASHI, Satoshi YOSHIDA, Toshiki UEDA, Shimpei KIMURA, Takahiro IZUMI
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Patent number: 10086480Abstract: Disclosed is a flux composition for use in brazing of an aluminum alloy material and includes a flux component [A] containing KAlF4; and a fluoride [B] containing an element other than Group 1 elements and Group 2 elements and containing no potassium (K). Also disclosed is a brazing sheet which includes an aluminum alloy core; a filler material lying on or over at least one side of the core; and a flux layer lying on or over one side of the filler material and including the flux composition.Type: GrantFiled: October 17, 2012Date of Patent: October 2, 2018Assignees: Kobe Steel, Ltd., DENSO CORPORATIONInventors: Nobuhiro Kobayashi, Motohiro Horiguchi, Koichi Sakamoto, Toshiki Ueda, Shimpei Kimura, Takahiro Izumi
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Publication number: 20180214990Abstract: The present invention provides an aluminum alloy brazing sheet for electric resistance welding, which has high strength while being thinned and can reduce the occurrence of welding defects in the electric resistance welding. Disclosed is an aluminum alloy brazing sheet for electric resistance welding, including a core layer and a brazing filler layer cladded on at least one surface of the core layer, wherein the brazing filler layer is made of an aluminum alloy comprising Si: 5.5 to 12.0% by mass, and at least one of Na: 0.0003 to 0.0030% by mass and Sr: 0.0020 to 0.1000% by mass, with the balance being Al and inevitable impurities, wherein the brazing filler layer in a molten state at 650° C. exhibits a viscosity of 0.01 Pa·s or less.Type: ApplicationFiled: March 27, 2015Publication date: August 2, 2018Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Shimpei KIMURA, Toshiki UEDA, Takahiro IZUMI, Yuji SHIBUYA
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Publication number: 20180169798Abstract: The present invention relates to a brazing method for an aluminum alloy brazing sheet including a core material and a brazing filler material provided in one surface of the core material. The core material includes an aluminum alloy containing Mg: more than 0.5 mass % and 2.5 mass % or less. The brazing filler material includes an aluminum alloy containing Si: 3 mass % or more and 13 mass % or less and Bi: 0.01 mass % or more and 1.00 mass % or less. The brazing method includes brazing the aluminum alloy brazing sheet in an inert gas atmosphere at a heating temperature of 560 to 620° C. without using a flux.Type: ApplicationFiled: December 7, 2017Publication date: June 21, 2018Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)Inventors: Takahiro Izumi, Akihiro Tsuruno, Shimpei Kimura, Nobuhiro Kobayashi
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Publication number: 20180169797Abstract: The present invention relates to an aluminum alloy brazing sheet including a core material and a brazing filler material provided on one surface of the core material. The core material contains Mn: 0.5 mass % or more and 2.5 mass % or less and Mg: more than 0.5 mass % and 2.5 mass % or less, with the remainder being Al and unavoidable impurities. The brazing filler material contains Si: 3 mass % or more and 13 mass % or less and Bi: 0.01 mass % or more and 1.00 mass % or less, with the remainder being Al and unavoidable impurities.Type: ApplicationFiled: December 7, 2017Publication date: June 21, 2018Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)Inventors: Takahiro IZUMI, Akihiro TSURUNO, Shimpei KIMURA, Nobuhiro KOBAYASHI
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Publication number: 20180021893Abstract: The present invention provides a brazing filler material in which the formation of coarse Si particles is suppressed, and a brazing sheet using the same. The brazing filler material includes Si: 3.5% by mass or more and 13.0% by mass or less, Ti: 0.001% by mass or more and 0.05% by mass or less, V: more than 0.0005% by mass and 0.05% by mass or less, and B: 0.001% by mass or less (excluding 0% by mass), with the balance being Al and inevitable impurities, and the value of V/Ti, which is a value obtained by dividing the V content (% by mass) by the Ti content (% by mass) is 0.05 or more and 5 or less.Type: ApplicationFiled: February 23, 2016Publication date: January 25, 2018Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Takahiro IZUMI, Kenichiro YOSHIDA, Akihiro TSURUNO
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Patent number: 9751143Abstract: An aluminum alloy brazing sheet for heat exchangers has a core, a sacrificial material formed on one side of the core, and a brazing filler metal formed on the other side of the core. The core is made of an aluminum alloy containing Si, Cu, Mn, and Al. The sacrificial material is made of an aluminum alloy containing Si, Zn, Mg, and Al. The brazing filler metal is made of an aluminum alloy. The aluminum alloy brazing sheet for heat exchangers has a work hardening exponent n of not less than 0.05. The core has an average crystal grain size of not more than 10 ?m in a cross-section. The aluminum alloy brazing sheet for heat exchangers has excellent strength and corrosion resistance even when it is formed into a thin material and also has excellent high frequency weldability and weld cracking resistance during electric resistance welding.Type: GrantFiled: March 12, 2013Date of Patent: September 5, 2017Assignees: KOBE STEEL, LTD., DENSO CORPORATIONInventors: Shimpei Kimura, Toshiki Ueda, Takahiro Izumi, Haruyuki Konishi, Hayaki Teramoto, Osamu Hakamata, Michiyasu Yamamoto
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Publication number: 20170232561Abstract: Disclosed is an aluminum alloy brazing sheet including a core material, a brazing filler material provided on one surface of the core material and formed of an Al—Si based alloy, and a sacrificial anode material provided on the other surface of the core material, the brazing sheet having a thickness of less than 200 ?m, wherein the core material includes more than 1.5% by mass and 2.5% or less by mass of Cu, and 0.5 to 2.0% by mass of Mn, with the balance being Al and inevitable impurities, wherein the sacrificial anode material includes 2.0 to 10.0% by mass of Zn, an Mg content in the sacrificial anode material being restricted to 0.10% or less by mass, with the balance being Al and inevitable impurities, and wherein each of the brazing filler material and the sacrificial anode material has a thickness thereof in a range of 15 to 50 ?m, and the total of cladding rates of the brazing filler material and sacrificial anode material is 50% or less.Type: ApplicationFiled: September 28, 2015Publication date: August 17, 2017Applicants: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.), DENSO CORPORATIONInventors: Shimpei KIMURA, Akihiro TSURUNO, Takahiro IZUMI, Yuji SHIBUYA, Hayaki TERAMOTO, Michiyasu YAMAMOTO, Manabu HASEGAWA, Shoei TESHIMA
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Publication number: 20170182602Abstract: A laminated aluminum alloy sheet that includes a core material and a sacrificial material being clad on at least one side surface of the core material. The core material contains Mn: from 0.5 to 1.8 mass %, Si: from 0.4 to 1.5 mass % and Cu: from 0.05 to 1.2 mass %, and contains at least one member of Fe: 1.0 mass % or less and Ti: 0.3 mass % or less, with the remainder being Al and unavoidable impurities. The core material has a number density of dispersoids having a particle diameter of 0.01 to 0.5 um of from 20 to 80/um3.Type: ApplicationFiled: March 25, 2015Publication date: June 29, 2017Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Katsushi MATSUMOTO, Masao KINEFUCHI, Takahiro IZUMI
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Publication number: 20170173741Abstract: Provided is an aluminium alloy laminated plate having a sacrificial material cladded to at least one side surface of a core material, wherein the core material contains specified amounts of Mn, Si, Cu, Mg, Fe, and Ti, the balance is Al and inevitable impurities, the number density of dispersed particles having a particle size of 0.01-0.5 ?m is 10-100/?m3, and [(the total solid solution amount of Mg, Mn, Si, and Cu)/(the total added amount of Mg, Mn, Si, and Cu)] is 0.10 or more.Type: ApplicationFiled: March 24, 2015Publication date: June 22, 2017Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Katsushi MATSUMOTO, Takahiro IZUMI
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Publication number: 20170173740Abstract: The present invention provides a brazing sheet formed of an aluminum alloy which exhibits excellent post-brazing strength, corrosion resistance and brazability even though its thickness is less than 200 ?m. Disclosed is a brazing sheet formed of an aluminum alloy including a core layer, a brazing filler layer provided on one side of the core layer and formed of an Al—Si based alloy, and a sacrificial layer provided on the other side of the core layer, the brazing sheet having a thickness of less than 200 ?m, wherein the core layer includes Cu: more than 1.5% by mass and 2.5% or less by mass and Mn: 0.5 to 2.0% by mass, with the balance being Al and inevitable impurities, the sacrificial layer includes Zn: 2.0 to 7.0% by mass and Mg: more than 0.10% by mass and 3.Type: ApplicationFiled: February 9, 2015Publication date: June 22, 2017Applicants: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.), DENSO CORPORATIONInventors: Shimpei KIMURA, Akihiro TSURUNO, Takahiro IZUMI, Yuji SHIBUYA, Hayaki TERAMOTO, Shoei TESHIMA, Manabu HASEGAWA, Michiyasu YAMAMOTO