Patents by Inventor Yoshihito Kawamura
Yoshihito Kawamura 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: 20230340653Abstract: The present disclosure intends to provide an aircraft member having both high strength and good ductility. Further, the present disclosure intends to provide an aircraft member satisfying required flame resistance. Further, the present disclosure intends to provide an aircraft member satisfying required corrosion resistance. In a method of manufacturing the aircraft member according to the present disclosure, a billet of an Mg—Al—Ca based alloy is extruded at an extrusion temperature that is higher than or equal to 350° C. and lower than or equal to 400° C. and at a ram rate that is higher than or equal to 1 mm/sec and lower than or equal to 3 mm/sec.Type: ApplicationFiled: October 8, 2020Publication date: October 26, 2023Inventors: Takayuki TAKAHASHI, Hiroki MORI, Yoshihito KAWAMURA, Michiaki YAMASAKI
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Publication number: 20230201416Abstract: Provided is an implant magnesium alloy having corrosion resistance, mechanical strength, ductility at the same time. In one aspect of the present invention, an implant magnesium alloy contains: x at % of Zn; a total of y at % of at least one element of Ca and Sr; and the balance of Mg and inevitable impurities. x and y satisfy formulae 1 and 2: 0.15?x?1.5??(Formula 1) 0.5?y?1.5.Type: ApplicationFiled: April 21, 2021Publication date: June 29, 2023Inventor: Yoshihito KAWAMURA
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Publication number: 20230054126Abstract: Provided is a magnesium alloy having a thermal conductivity of 75 W/m·K or more and a high specific strength. One aspect of the present invention is a magnesium alloy containing a at. % of Al, b at. % of Ca, c at. % of Mn, and d at. % of D, with the remainder comprising Mg and unavoidable impurities. D has at least one of a rare-earth element (RE), Sn, Li, Zn, Ag, Be and Sc. The magnesium alloy does not contain Si and Sr. C mentioned above satisfies expression 1 below, d satisfies expression 2 below, and a and b are within a range enclosed by the solid line shown in FIG. 1. The thermal conductivity is 75 W/m·K or greater. 0?c?0.Type: ApplicationFiled: February 5, 2021Publication date: February 23, 2023Applicant: MG Port Inc.Inventors: Yoshihito KAWAMURA, Shinichi INOUE
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Publication number: 20210355561Abstract: The present invention provides a novel heat exchange medium to replace lead. A carbon-steel wire 1A heated in a heating furnace 11 is passed through a bath 12A filled with a liquid-phase Mg—Al—Ca alloy 20 obtained by melting a Mg—Al—Ca alloy in which the main constituent elements are Mg (magnesium), Al (aluminum) and Ca (calcium). When it passes through the bath 12A, the carbon-steel wire 1A, which has been heated for example to about 950° C. in the heating furnace 11, is cooled to about 550° C. The Mg—Al—Ca alloy is non-toxic and has no environmental impact as well.Type: ApplicationFiled: July 27, 2021Publication date: November 18, 2021Applicants: TOKYO ROPE MANUFACTURING CO., LTD., NATIONAL UNIVERSITY CORPORATION KUMAMOTO UNIVERSITYInventors: Kazuhiro ISHIMOTO, Yoshihito KAWAMURA
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Patent number: 10358702Abstract: To provide a magnesium alloy having high incombustibility, high strength and high ductility together. A magnesium alloy including Ca in an amount of “a” atomic %, Al in an amount of “b” atomic % and a residue of Mg, including (Mg, Al)2Ca in an amount of “c” volume %, wherein “a”, “b” and “c” satisfy the following equations (1) to (4), and having the (Mg, Al)2Ca dispersed therein. 3?a?7??(1) 4.5?b?12??(2) 1.2?b/a?3.Type: GrantFiled: April 16, 2013Date of Patent: July 23, 2019Assignee: NATIONAL UNIVERSITY CORPORATION KUMAMOTO UNIVERSITYInventors: Yoshihito Kawamura, Michiaki Yamasaki
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Patent number: 10260130Abstract: Disclosed is a magnesium alloy material having excellent tensile strength and favorable ductility. Therefore, the magnesium alloy sheet material formed by rolling a magnesium alloy having a long period stacking order phase crystallized at the time of casting includes in a case where a sheet-thickness traverse section of an alloy structure is observed at a substantially right angle to the longitudinal direction by a scanning electron microscope, a structure mainly composed of the long period stacking order phase, in which, at least two or more ?Mg phases having thickness in the observed section of 0.5 ?m or less are laminated in a layered manner with the sheet-shape long period stacking order phase.Type: GrantFiled: March 13, 2015Date of Patent: April 16, 2019Assignees: National University Corporation Kumamoto University, Kumamoto Technology & Industry Foundation, Nissan Motor Co., LtdInventors: Yoshihito Kawamura, Masafumi Noda, Hiroshi Sakurai
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Patent number: 10184165Abstract: A high strength and high toughness magnesium alloy, characterized in that it is a plastically worked product produced by a method comprising preparing a magnesium alloy cast product containing a atomic % of Zn, b atomic % of Y, a and b satisfying the following formulae (1) to (3), and the balance amount of Mg, subjecting the magnesium alloy cast product to a plastic working to form a preliminary plastically worked product, and subjecting the preliminary plastically worked product to a heat treatment, and it has a hcp structure magnesium phase and a long period stacking structure phase at an ordinary temperature; (1) 0.5?a<5.0 (2) 0.5<b<5.0 (3) ?a???b.Type: GrantFiled: August 1, 2014Date of Patent: January 22, 2019Inventors: Yoshihito Kawamura, Michiaki Yamasaki
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Patent number: 10138535Abstract: A magnesium alloy having high strength and high ductility and in which at least one of corrosion resistance and flame resistance is enhanced, or a method of manufacturing the same. The magnesium alloy contains an atomic % of Ca and b atomic % of Al, totally contains k atomic % of at least one element selected from a group consisting of Mn, Zr, Ag, Y and Nd, has a composition in which a remaining part is formed of Mg and contains c volume % of (Mg, Al)2Ca, a, b, c and k satisfying formulae (1) to (4) and (21) below. The (Mg, Al)2Ca is dispersed and the at least one element is an element that enhances at least one of corrosion resistance and flame resistance: (1) 3?a?7, (2) 4.5?b?12, (3) 1.2?b/a?3.0, (4) 10?c?35, (21) 0<k?0.3.Type: GrantFiled: October 22, 2014Date of Patent: November 27, 2018Assignee: NATIONAL UNIVERSITY CORPORATION KUMAMOTO UNIVERSITYInventors: Yoshihito Kawamura, Michiaki Yamasaki
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Patent number: 9562277Abstract: The present invention provides a magnesium alloy material, having superior mechanical properties without using special production equipment or processes, and a production process thereof. The magnesium alloy material of the present invention composed of an Mg—Zn—RE alloy comprises essential components in the form of 0.5 to 3 atomic percent of Zn and 1 to 5 atomic percent of RE, with the remainder comprising Mg and unavoidable impurities. The Mg—Zn—RE alloy has a lamellar phase formed from a long period stacking ordered structure and ?-Mg in the alloy structure thereof. The long period stacking ordered structure has at least one of a curved portion and a bent portion and has a divided portion in at least a portion thereof. Finely granulated ?-Mg having a mean particle diameter of 2 ?m or less is formed in the divided portion.Type: GrantFiled: November 20, 2007Date of Patent: February 7, 2017Assignees: Kobe Steel, Ltd., NISSAN MOTOR CO., LTD., NATIONAL UNIVERSITY CORPORATION KUMAMOTO UNIVERSITYInventors: Mamoru Nakata, Yuuichi Yamada, Koji Itakura, Yoshio Okada, Yoshihito Kawamura, Michiaki Yamasaki
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Publication number: 20160369378Abstract: A magnesium alloy having high strength and high ductility and in which at least one of corrosion resistance and flame resistance is enhanced, or a method of manufacturing the same. The magnesium alloy contains an atomic % of Ca and b atomic % of Al, totally contains k atomic % of at least one element selected from a group consisting of Mn, Zr, Ag, Y and Nd, has a composition in which a remaining part is formed of Mg and contains c volume % of (Mg, Al)2Ca, a, b, c and k satisfying formulae (1) to (4) and (21) below. The (Mg, Al)2Ca is dispersed and the at least one element is an element that enhances at least one of corrosion resistance and flame resistance: (1) 3?a?7, (2) 4.5?b?12, (3) 1.2?b/a?3.0, (4) 10?c?35, (21) 0<k?0.3.Type: ApplicationFiled: October 22, 2014Publication date: December 22, 2016Applicant: National University Corporation Kumamoto UniversityInventors: Yoshihito KAWAMURA, Michiaki YAMASAKI
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Publication number: 20160355917Abstract: This invention provides a high-strength and high-toughness metal which has strength and toughness each high enough to be put to practical use in expanded applications of magnesium alloys, and a process for producing the same. The high-strength and high-toughness metal is a magnesium alloy comprising a crystal structure containing an hcp-structure magnesium phase and a long-period layered structure phase. At least a part of the long-period layered structure phase is in a curved or flexed state. The magnesium alloy comprises a atomic % of Zn and b atomic % of Gd with the balance consisting of Mg.Type: ApplicationFiled: June 15, 2016Publication date: December 8, 2016Inventors: Yoshihito KAWAMURA, Michiaki YAMASAKI
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Publication number: 20160168666Abstract: A method of manufacturing a flame-retardant magnesium alloy having mechanical properties of a long period stacking ordered magnesium alloy and having an ignition temperature of 800° C. or more is provided. In the method of manufacturing a flame-retardant magnesium alloy, a flame-retardant magnesium alloy which contains a atomic % of Zn, b atomic % of at least one element selected from a group consisting of Gd, Tb, Tm and Lu, and x atomic % of Ca and in which a remaining part is formed of Mg and a, b and x satisfy Formulae 1 to 4 below is melted. 0.2?a?5.0??(Formula 1) 0.5?b?5.0??(Formula 2) 0.5a?0.5?b??(Formula 3) 0<x?0.Type: ApplicationFiled: April 14, 2014Publication date: June 16, 2016Applicant: National University Corporation Kumamoto UniversityInventors: Yoshihito KAWAMURA, Jonghyun KIM
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Publication number: 20160068933Abstract: A method of manufacturing a flame-retardant magnesium alloy having mechanical properties of a long period stacking ordered magnesium alloy and having an ignition temperature of 800° C. or more is provided. The method of manufacturing a flame-retardant magnesium alloy comprises a step of melting a flame-retardant magnesium alloy which contains a atomic % of Zn, b atomic % of Y, x atomic % of Ca and a residue of Mg, and a, b and x satisfy formulae 1 to 4 below. 0.5?a<5.0??(Formula 1) 0.5<b<5.0??(Formula 2) ?a???b??(Formula 3) 0<x?0.Type: ApplicationFiled: April 14, 2014Publication date: March 10, 2016Applicant: National University Corporation Kumamoto UniversityInventors: Yoshihito KAWAMURA, Jonghyun KIM
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Publication number: 20150307970Abstract: Disclosed is a magnesium alloy material having excellent tensile strength and favorable ductility. Therefore, the magnesium alloy sheet material formed by rolling a magnesium alloy having a long period stacking order phase crystallized at the time of casting includes in a case where a sheet-thickness traverse section of an alloy structure is observed at a substantially right angle to the longitudinal direction by a scanning electron microscope, a structure mainly composed of the long period stacking order phase, in which, at least two or more ?Mg phases having thickness in the observed section of 0.5 ?m or less are laminated in a layered manner with the sheet-shape long period stacking order phase.Type: ApplicationFiled: March 13, 2015Publication date: October 29, 2015Inventors: Yoshihito KAWAMURA, Masafumi NODA, Hiroshi SAKURAI
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Publication number: 20150090374Abstract: To provide a magnesium alloy having high incombustibility, high strength and high ductility together. A magnesium alloy including Ca in an amount of “a” atomic %, Al in an amount of “b” atomic % and a residue of Mg, including (Mg, Al)2Ca in an amount of “c” volume %, wherein “a”, “b” and “c” satisfy the following equations (1) to (4), and having the (Mg, Al)2Ca dispersed therein. 3?a?7??(1) 4.5?b?12??(2) 1.2?b/a?3.Type: ApplicationFiled: April 16, 2013Publication date: April 2, 2015Inventors: Yoshihito Kawamura, Michiaki Yamasaki
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Patent number: 8944307Abstract: A welding method of applying energy to an interface where a metal glass and a crystalline metal make contact with each other or to the metal glass near the interface, heating and melting the metal glass to form a molten layer, and joining the metal glass and the crystalline metal. The metal glass has a glass formation ability in which a nose time of a TTT curve when a solid of the metal glass is reheated is 0.2 seconds or more. The metal glass and the crystalline metal are formed with a material that satisfies a temperature range of a temperature of the metal glass at which a spread factor of the crystalline metal that has not been melted and the molten metal glass is 25% or more and a melting point of the crystalline metal to be 100 K or more.Type: GrantFiled: March 18, 2010Date of Patent: February 3, 2015Assignees: National University Corporation Kumamoto University, Kuroki Kogosyo Co., Ltd.Inventors: Yoshihito Kawamura, Jonghyun Kim, Hironori Kuroki, Yuji Yanagida, Naohisa Sawai, Masafumi Miyajima
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Publication number: 20150023836Abstract: This invention provides a high-strength and high-toughness metal which has strength and toughness each high enough to be put to practical use in expanded applications of magnesium alloys, and a process for producing the same. The high-strength and high-toughness metal is a magnesium alloy comprising a crystal structure containing an hcp-structure magnesium phase and a long-period layered structure phase. At least a part of the long-period layered structure phase is in a curved or flexed state. The magnesium alloy comprises a atomic % of Zn and b atomic % of Gd with the balance consisting of Mg.Type: ApplicationFiled: July 28, 2014Publication date: January 22, 2015Inventors: Yoshihito KAWAMURA, Michiaki YAMASAKI
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Publication number: 20150020931Abstract: A high strength and high toughness magnesium alloy, characterized in that it is a plastically worked product produced by a method comprising preparing a magnesium alloy cast product containing a atomic % of Zn, b atomic % of Y, a and b satisfying the following formulae (1) to (3), and the balance amount of Mg, subjecting the magnesium alloy cast product to a plastic working to form a preliminary plastically worked product, and subjecting the preliminary plastically worked product to a heat treatment, and it has a hcp structure magnesium phase and a long period stacking structure phase at an ordinary temperature; (1) 0.5?a<5.0 (2) 0.5<b<5.0 (3) ?a???b.Type: ApplicationFiled: August 1, 2014Publication date: January 22, 2015Inventors: Yoshihito KAWAMURA, Michiaki YAMASAKI
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Publication number: 20150013854Abstract: A high strength and high toughness magnesium alloy, characterized in that it is a plastically worked product produced by a method comprising preparing a magnesium cast product containing a atomic % of Zn, b atomic % in total of at least one element selected from the group consisting of Dy, Ho and Er, a and b satisfying the following formulae (1) to (3), and the balance amount of Mg, subjecting the magnesium alloy cast product to a plastic working to form a plastically worked product, and it has a hcp structure magnesium phase and a long period stacking structure phase at an ordinary temperature; 0.2?a?5.0??(1) 0.2?b?5.0??(2) 0.5a?0.Type: ApplicationFiled: September 18, 2014Publication date: January 15, 2015Inventors: Yoshihito KAWAMURA, Michiaki YAMASAKI
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Publication number: 20130284829Abstract: Provided is an injection nozzle which is capable of maintain high response performance over a long period of time, in a manner compatible with an increase in fuel injection pressure of a high-pressure common rail system which is one type of fuel injection system for internal combustion engines such as diesel engines. The injection nozzle comprises a valve body 1, and a needle valve 2 disposed in an inner bore of the valve body 1 and adapted to intermittently seal an injection port 11 of the nozzle body 1, wherein at least a distal end 22 of the needle valve 2 is made of a metallic glass.Type: ApplicationFiled: November 2, 2011Publication date: October 31, 2013Applicant: KUROKI KOGYOSHO CO., LTD.Inventors: Yoshihito Kawamura, Jonghyun Kim, Hironori Kuroki, Yuji Yanagida, Naohisa Sawai, Masafumi Miyajima