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公开(公告)号：JP2002111273A
公开(公告)日：2002-04-12
申请号：JP2000300681
申请日：2000-09-29
Inventor： HASHIMOTO MITSUO , FUKUOKA KATSUHIRO , TOMITA MASARU , MIYAMOTO TAKESHI , MURAKAMI MASAHITO
IPC: H05K9/00
Abstract: PROBLEM TO BE SOLVED: To provide a magnetic-shielded transformer which encloses a magnetic path with a bulk high temperature superconductor to lessen the problems of the flux leakage, energy loss due to core loss and efficiency reduction. SOLUTION: A magnetic path of a flux resulting between a primary coil and a secondary coil is enclosed with a bulk high temperature superconductor which is composed of a plurality of clad bulk high temperature superconductors. The bulk high temperature superconductor is inserted between the primary coil and the secondary coil to block other magnetic paths from being formed, than the magnetic path of that flux. The magnetic path of that flux is an air core or a ferromagnetic core.
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2.发明专利
公开(公告)号：JP2003095650A
公开(公告)日：2003-04-03
申请号：JP2002154900
申请日：2002-05-29
Applicant: INT SUPERCONDUCTIVITY TECH
Inventor： YU CHO , YU HIYO , GO HAJIME , MACHI TAKAHITO , SATSUMOTO ANSHIKI , KOSHIZUKA NAOKI , MURAKAMI MASAHITO
Abstract: PROBLEM TO BE SOLVED: To produce MgB2 -based superconductor which is simple to manufacture and excellent in the mass productivity and showing an excellent superconductivity (a high critical current density and the like), retaining the property of the high critical temperature of MgB2 . SOLUTION: The MgB2 -based superconductor in which Ti and/or Ti compound scatteredly exist in the polycrystalline substance of MgB2 is manufactured by pressure-forming the mixture of Mg, B and Ti as shown in Fig. 1 and then firing the pressure-formed mixture in the atmospheric pressure and the like (preferably at the temperature not less than 600 deg.C). It is preferred to give the composition of MgB2 -based superconductor in the range of 0.7
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公开(公告)号：JP2002359408A
公开(公告)日：2002-12-13
申请号：JP2001163707
申请日：2001-05-31
Applicant: INT SUPERCONDUCTIVITY TECH , RAILWAY TECHNICAL RES INST
Inventor： TOMITA MASARU , MURAKAMI MASAHITO , SAWA KOICHIRO
Abstract: PROBLEM TO BE SOLVED: To provide a mechanical permanent current switch of a relatively low cost which acts quickly and supplies a large capacity of current to a superconducting magnet without losses. SOLUTION: The contact-point material of a mechanical permanent current switch is composed of 'bulk RE-Ba-Ca-O superconductor, provided by a fusion method (RE is a rare earth element)' which is impregnated with resin. The energizing direction may be parallel to an ab-surface for effectiveness by dispersing fillers of small linear expansion factor in the resin, enabling the contact surfaces between contact-point materials to be a polished surface, and allowing a surface vertical to the ab-surface of the contact-point material to be the contact surfaces between the contact-point materials. A pre-processing is conducted in which electrifying is performed by increasing a current value, until at least 'voltage rising phenomenon that follows voltage drop' appears, once the contact surfaces of the contact materials are made to contact each other, for use.
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公开(公告)号：JP2002198214A
公开(公告)日：2002-07-12
申请号：JP2000404695
申请日：2000-12-26
Applicant: INT SUPERCONDUCTIVITY TECH , RAILWAY TECHNICAL RES INST
Inventor： NAGASHIMA MASARU , TOMITA MASARU , NEMOTO KAORU , HERAI TOSHIKI , MURAKAMI MASAHITO
Abstract: PROBLEM TO BE SOLVED: To provide a superconducting magnet power lead, which is capable of restraining heat from penetrating into a liquid helium system that contains a superconducting coil and feeding sufficient electric power to the superconducting coil. SOLUTION: A superconducting magnet power lead for feeding a current to 'a superconducting coil cooled down to liquid helium temperature of' via 'a radiation heat shielding unit, cooled down to liquid nitrogen temperature' in a superconducting magnet device is made to have a structure in which at least a part of the power lead located inside the radiation heat shielding unit is partially formed of an oxide high-temperature superconducting bulk body, whose critical temperature is higher than liquid nitrogen temperature. In this case, it is preferable that the bulk body be subjected to vacuum resin impregnating treatment to be improved in mechanical strength. When a braided lead is made to serve at least as a part of the magnet power lead except for the bulk body, stresses caused by the relative displacement of a device member is restrained from having adverse effects on the bulk body, so that the superconducting magnet power lead can be protected against damages.
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公开(公告)号：JP2001342020A
公开(公告)日：2001-12-11
申请号：JP2000158935
申请日：2000-05-29
Inventor： SAKAI NAOMICHI , MURAKAMI MASAHITO , OGASAWARA KEI , ISHIHARA TAIJI
Abstract: PROBLEM TO BE SOLVED: To provide a method of preparing a rare earth oxide super-conductor having high density and high strength. SOLUTION: This method comprises the steps of preparing a rare earth oxide super-conductor preparatively heat treated under oxygen atmosphere or under vacuum, and melting it to grow. More specifically, this method comprises the steps of mixing the materials containing the constituting elements of the rare earth oxide super-conductor in a prescribed ratio, forming the mixture to obtain a preparative formed body, heat treating the preparative formed body in vacuum or in an atmosphere consisting of oxygen only to obtain a preparative sintered compact, pyrolyzing the preparative sintered compact at a temperature below the foaming threshold value of oxygen, and melting to grow.
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Patent Agency Ranking
公开(公告)号：JP2001010879A
公开(公告)日：2001-01-16
申请号：JP17529099
申请日：1999-06-22
Applicant: INT SUPERCONDUCTIVITY TECH , RAILWAY TECHNICAL RES INST
Inventor： TOMITA MASARU , MURAKAMI MASAHITO
Abstract: PROBLEM TO BE SOLVED: To obtain an oxide superconductor capable of securing intense caught magnetic field and of maintaining its performance over a long period without being affected by internal/external force such as thermal stress and corrosive environment, and to provide a method for producing such a superconductor. SOLUTION: This oxide superconductor is set to be such 'a construction as to consist of an oxide superconductive bulk form with its outer surface provided with a resin-impregnated cloth-adhered coating layer' or 'a construction as to furnish the surface layer of the above oxide superconductive bulk form with a layer impregnated with a resin or a resin dispersed with a filler material of low linear expansion coefficient'. This oxide superconductor is obtained, for example, by covering the surface of an oxide superconductive bulk form with a cloth followed by holding the bulk form thus covered in a reduced pressure atmosphere and then contacting it with a liquid resin or filler- included liquid resin.
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公开(公告)号：JP2000256082A
公开(公告)日：2000-09-19
申请号：JP6113599
申请日：1999-03-09
Applicant: INT SUPERCONDUCTIVITY TECH , RAILWAY TECHNICAL RES INST
Inventor： TOMITA MASARU , MURAKAMI MASAHITO
Abstract: PROBLEM TO BE SOLVED: To provide an oxide superconductor capable of securing high trapped magnetic field and maintaining the performance for a long period of time without being affected by internal or external force such as heat stress or corrosive environment, and to provide a method for producing the same. SOLUTION: As shown in the figure as the example, the constitution of the oxide superconductor is made such a constitution that 'the oxide superconductor has an impregnated resin layer and is covered with a resin layer containing a dispersed fine filler material having a small coefficient of linear thermal expansion', or 'the oxide superconductor has an impregnated layer of a resin containing a dispersed fine filler material at the surface layer part' or 'the oxide superconductor has an impregnated layer of a resin containing a dispersed fine filler material and the external surface of it is covered by a resin containing a dispersed fine filler material'. Further, an appropriate amount of Ag may be suitably added to the bulk body. This oxide superconductor is obtained by bringing into contact with a liquid resin or a liquid resin containing the filler material under a reduced pressure atmosphere to infiltrate the resin, and further coating the external surface of the resultant material with the liquid resin containing the filler material, or subjecting the resultant material to other appropriate treatments.
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公开(公告)号：JPH11228137A
公开(公告)日：1999-08-24
申请号：JP3301998
申请日：1998-02-16
Applicant: SUMITOMO ELECTRIC INDUSTRIES , INT SUPERCONDUCTIVITY TECH
Inventor： HAYASHI NORIKATA , MURAKAMI MASAHITO
Abstract: PROBLEM TO BE SOLVED: To provide a producing method of an oxide superconductive bulk body capable of being utilized for or a flywheel or the like. SOLUTION: A process for preparing a formed body 14 containing a 123 component expressed by a composition formula of ABa2 Cu3 Ox (A represents one kind selected from a group composed of Nd, Sm, Eu, Gd, Dy, Y, Ho and Er) and a 211 component expressed by a composition formula of A2 BaCuO5 or a 422 component expressed by a composition formula of A4 Ba2 CU2 O10 , a process for melting the 123 component in the formed body 14, a process for allowing the upper surface of the formed body 14 to contact with a seed crystal 13 and a process for obtaining a single domain oxide super conductive bulk body by solidifying the 123 component are provided. The temp. gradient G1 is given to the formed body so that the temp. of the edge becomes higher than that of the center. And the temp. gradient G2 is given so that the temp. of the back surface becomes higher than that of the upper surface. When the cooling rate in the side face direction is expressed by R1 and the cooling rate in the back surface direction is expressed by R2 , a relational equation of R1 /G1
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公开(公告)号：JPH11186024A
公开(公告)日：1999-07-09
申请号：JP36565197
申请日：1997-12-22
Applicant: INT SUPERCONDUCTIVITY TECH , RAILWAY TECHNICAL RES INST , DU PONT
Inventor： MURAKAMI MASAHITO , KOSHIRO HIROKI , NAGASHIMA MASARU
Abstract: PROBLEM TO BE SOLVED: To provide an oxide superconductor pseudo permanent magnet of large dimensions, capable of exhibiting superior magnetic characteristics over a wide range of magnetic field region and can be commercially stably manufactured. SOLUTION: An R-Ba-Cu-O oxide high-temperature superconductor pseudo permanent magnet is made into annular form which has a face of superconductor crystal (ab) in its axial and circumferential directions and a c-axis directed in the radial direction. The magnet can be manufactured by applying a paste of oxide high-temperature superconductor forming source material onto an annular base surface and forming an annular superconductor crystal layer by a melt growth method through the use of a seed crystal, or by forming a superconductor crystalline layer on a strip-shaped base surface in a similar method, bending it into an annulus and diffusion-jointing both ends of the ring.
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公开(公告)号：JP2003089516A
公开(公告)日：2003-03-28
申请号：JP2001280244
申请日：2001-09-14
Applicant: INT SUPERCONDUCTIVITY TECH , JAPAN SCIENCE & TECH CORP
Inventor： MACHI TAKAHITO , KATO ISAO , ITO YUTAKA , KOSHIZUKA NAOKI , MURAKAMI MASAHITO
Abstract: PROBLEM TO BE SOLVED: To provide an MgB2 superconductor easy to produce and mass- producible as long articles, and to provide a method for producing the superconductor. SOLUTION: The MgB2 superconductor consists of a shell made of a tubular metal such as copper and a core material of the reaction product of Mg and B formed by sealing Mg and B in the shell and heating these. In the method for producing the superconductor, Mg and B are sealed in the tubular metal, the tubular metal in which Mg and B have been sealed is optionally worked in a wire or belt shape and Mg and B are reacted by heating the tubular metal as shown in figure 1. The tubular metal as the shell may be removed from the material after the reaction to obtain an MgB2 superconductor.
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