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公开(公告)号：US20230408207A1
公开(公告)日：2023-12-21
申请号：US18236766
申请日：2023-08-22
CPC分类号： F28D17/02 , F28D19/041 , C09K5/14 , F25B2309/003
摘要： A method may produce a two-stage heat regenerating cryogenic refrigerator including a vacuum vessel, first and second cylinder disposed in the vessel, the second cylinder coaxially connected to the first cylinder, and first and second regenerator respectively disposed in the first and second cylinder. The method may include: accommodating a first heat regenerating material (HRM) in the first regenerator; and filling a plurality of HRM particles in the second regenerator. The HRM particles may be a second HRM, each of the HRM particles including an oxide or oxysulfide heat regenerating substance having a maximum value of specific heat at a temperature of ≤20 K of 0.3+ J/cm3·K and Ca, Mn, Mg, Be, Sr, Al, Fe, Cu, Ni, and/or Co. Each of the HRM particles may include a first and second region, the second region being closer to an HRM particle outer edge than the first region.
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公开(公告)号：US20230002663A1
公开(公告)日：2023-01-05
申请号：US17900637
申请日：2022-08-31
发明人： Takahiro KAWAMOTO , Tomoko EGUCHI , Tomohiro YAMASHITA , Masaya HAGIWARA , Akiko SAITO , Daichi USUI
摘要： A cold storage material, which has a large specific heat and a small magnetization in an extremely low temperature region and has satisfactory manufacturability, is provided, and a method for manufacturing the same is provided. Further, a refrigerator having high efficiency and excellent cooling performance is provided by filling this refrigerator with the above-described cold storage material. Moreover, a device incorporating a superconducting coil capable of reducing influence of magnetic noise derived from a cold storage material is provided. The cold storage material of embodiments is a granular body composed of an intermetallic compound in which the ThCr2Si2-type structure 11 occupies 80% by volume or more, and has a crystallite size of 70 nm or less.
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公开(公告)号：US20230279281A1
公开(公告)日：2023-09-07
申请号：US18170958
申请日：2023-02-17
IPC分类号： C09K5/14 , F28D20/00 , G01R33/38 , C04B35/50 , C04B35/45 , C04B35/626 , C04B35/636 , C04B35/624 , C04B35/64 , H01F6/00
CPC分类号： C09K5/14 , F28D20/0056 , G01R33/3804 , C04B35/50 , C04B35/45 , C04B35/6264 , C04B35/636 , C04B35/624 , C04B35/64 , C04B35/62655 , H01F6/00 , C04B2235/3224 , C04B2235/3217 , C04B2235/449 , C04B2235/3291 , C04B2235/446
摘要： A cold storage material particle of an embodiment includes at least one first element selected from the group consisting of a rare earth element, silver (Ag), and copper (Cu) and a second element that is different from the first element and forms a multivalent metal ion in an aqueous solution, in which an atomic concentration of the second element is 0.001 atomic % or more and 60 atomic % or less, and a maximum value of volume specific heat at a temperature of 20K or less is 0.3 J/cm3·K or more.
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公开(公告)号：US20230002662A1
公开(公告)日：2023-01-05
申请号：US17900629
申请日：2022-08-31
发明人： Takahiro KAWAMOTO , Tomoko EGUCHI , Tomohiro YAMASHITA , Masaya HAGIWARA , Akiko SAITO , Daichi USUI
摘要： A cold storage material, which has a large specific heat and a small magnetization in an extremely low temperature region and has satisfactory manufacturability, is provided, and a method for manufacturing the same is provided. Further, a refrigerator having high efficiency and excellent cooling performance is provided by filling this refrigerator with the above-described cold storage material. Moreover, a device incorporating a superconducting coil capable of reducing influence of magnetic noise derived from a cold storage material is provided. The cold storage material of embodiments is a granular body composed of an intermetallic compound in which the ThCr2Si2-type structure 11 occupies 80% by volume or more, and has a crystallite size of 70 nm or less.
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公开(公告)号：US20220243997A1
公开(公告)日：2022-08-04
申请号：US17728138
申请日：2022-04-25
摘要： A two-stage heat regenerating cryogenic refrigerator may include: a vacuum vessel; a first and second cylinder in the vessel; the second cylinder coaxially connected to the first cylinder; a first regenerator in the first cylinder, the first regenerator accommodating heat regenerating material (HRM) 1; and a second regenerator in the second cylinder accommodating HRM 2, HRM 2 including plural HRM particles, each HRM particle including a heat regenerating substance having a maximum value of specific heat at a temperature of 20 K or less of 0.3 J/cm3·K or more and a metal element; each HRM particle including a first and second region, the second region being closer to each HRM particle's outer edge than the first, and the second region having a metal element higher concentration than the first, the first and second region containing the heat regenerating substance, and the heat regenerating substance contains an oxide or oxysulfide component.
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公开(公告)号：US20210309904A1
公开(公告)日：2021-10-07
申请号：US17211376
申请日：2021-03-24
发明人： Takahiro KAWAMOTO , Tomoko EGUCHI , Tomohiro YAMASHITA , Masaya HAGIWARA , Akiko SAITO , Daichi USUI
摘要： A cold storage material, which has a large specific heat and a small magnetization in an extremely low temperature region and has satisfactory manufacturability, is provided, and a method for manufacturing the same is provided. Further, a refrigerator having high efficiency and excellent cooling performance is provided by filling this refrigerator with the above-described cold storage material. Moreover, a device incorporating a superconducting coil capable of reducing influence of magnetic noise derived from a cold storage material is provided. The cold storage material of embodiments is a granular body composed of an intermetallic compound in which the ThCr2Si2-type structure 11 occupies 80% by volume or more, and has a crystallite size of 70 nm or less.
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公开(公告)号：US20230408206A1
公开(公告)日：2023-12-21
申请号：US18236716
申请日：2023-08-22
CPC分类号： F28D17/02 , F28D19/041 , C09K5/14 , F25B2309/003
摘要： A method may produce a heat regenerating material particle, including: preparing a slurry by adding a powder of the heat regenerating substance to an alginic acid aqueous solution and mixing the powder of the heat regenerating substance and the aqueous alginic acid solution; and forming a particle by gelling the slurry by dropping the slurry into a gelling solution. The gelling solution may include a metal element including calcium (Ca), manganese (Mn), magnesium (Mg) beryllium (Be), strontium (Sr), aluminum (Al), iron (Fe), copper (Cu), nickel (Ni), and cobalt (Co). The forming may involve controlling the gelation time so that a concentration of the metal element in a first region of the particle becomes lower than a concentration of the metal element in a second region. The second region may be closer to an outer edge of the particle compared to the first region.
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公开(公告)号：US20200300556A1
公开(公告)日：2020-09-24
申请号：US16556387
申请日：2019-08-30
摘要： A heat regenerating material particle of an embodiment contains a heat regenerating substance having a maximum value of specific heat at a temperature of 20 K or less is 0.3 J/cm3·K or more, and one metal element selected from the group consisting of calcium (Ca), magnesium (Mg), beryllium (Be), strontium (Sr), aluminum (Al), iron (Fe), copper (Cu), nickel (Ni), and cobalt (Co). The heat regenerating material particle includes a first region and a second region, the second region is closer to an outer edge of the heat regenerating material particle than the first region, and the second region has a higher concentration of the metal element than the first region.
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公开(公告)号：US20240321485A1
公开(公告)日：2024-09-26
申请号：US18459725
申请日：2023-09-01
CPC分类号： H01B12/06 , C04B35/4504 , C04B2235/3282 , H01F6/06 , H02K55/00
摘要： A superconducting wire according to an embodiment includes: a substrate; a first region provided on the substrate and containing a first rare earth element, Ba, Cu, and O; a second region provided on the substrate and containing a second rare earth element, Ba, Cu, and O; and a third region provided on the substrate, provided between the first region and the second region, and containing a third rare earth element, Pr, Ba, Cu, and O. A surface density of particles having an aspect ratio of 3 or more present on a surface of the third region is larger than a surface density of particles having an aspect ratio of 3 or more present on surfaces of the first region and the second region.
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