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公开(公告)号：DE69019258T2
公开(公告)日：1995-09-07
申请号：DE69019258
申请日：1990-08-16
Applicant: INT SUPERCONDUCTIVITY TECH , KYOCERA CORP , MITSUBISHI METAL CORP , TOKYO ELECTRIC POWER CO
Inventor： WADA TAKAHIRO , KORIYAMA SHINICHI , SAKURAI TAKESHI , SUZUKI NOBUO , MIYATAKE TAKAYUKI , YAMAUCHI HISAO , KOSHIZUKA NAOKI , TANAKA SHOJI
Abstract: A superconductive material is disclosed which has the following composition: (R1-xCax)(Ba1-yLay)2Cu4O8 wherein R is at least one element selected from Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb and Lu, x is a number in the range of 0-0.3 and y is a number in the range of 0.001-0.3 with the proviso that y is not greater than 0.2 when x is not 0.
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公开(公告)号：DE69018898D1
公开(公告)日：1995-06-01
申请号：DE69018898
申请日：1990-08-17
Applicant: INT SUPERCONDUCTIVITY TECH , MATSUSHITA ELECTRIC IND CO LTD , KYOCERA CORP , MITSUBISHI METAL CORP , TOKYO ELECTRIC POWER CO , KOBE STEEL LTD
Inventor： WADA TAKAHIRO , KORIYAMA SHIN-ICHI , SAKURAI TAKASHI , SUZUKI NOBUO , MIYATAKE TAKAYUKI , YAMAUCHI HISAO , KOSHIZUKA NAOKI , TANAKA SHOJI
IPC: C01G3/00 , C01G1/00 , C04B35/45 , H01B12/00 , H01L39/12 , C01F17/00 , C04B35/50 , C04B35/00 , H01L39/24
Abstract: Disclosed herein are high-temperature oxide superconductors of RBa2Cu4O8 type, with Ba partly repaced by Sr or Ca, or with R and Ba partly replaced by Ca and Sr, respectively, as represented by the chemical composition formula of R(Ba1-ySry)2Cu4O8 or R(Ba1-zCaz)2Cu4O8 or (R1-xCax)(Ba1-ySry)2Cu4O8. They exhibit superconductivity at high temperatures. Especially, the last one exhibits superconductivity at a higher temperature than the former two. All of them can be made with a less amount of Ba as a deleterious substance, and the first two have improved sinterability. The best results are obtained when they are produced by the process involving the hot hydrostatic pressure treatment of the mixture of raw materials at 850-1100 DEG C in an atmosphere composed of an inert gas and oxygen. The process permits a wider selection of Ba raw materials.
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公开(公告)号：DE69032641D1
公开(公告)日：1998-10-15
申请号：DE69032641
申请日：1990-10-31
Applicant: INT SUPERCONDUCTIVITY TECH , NIPPON STEEL CORP , SHIKOKU ELEC POWER , RAILWAY TECHNICAL RES INST
Inventor： MURAKAMI MASATO , OYAMA TERUTSUGU , FUJIMOTO HIROYUKI , KOSHIZUKA NAOKI , SHIOHARA YU , TANAKA SHOJI
Abstract: The present invention relates to a process for preparing an oxide superconductor having a high critical current density, a uniform structure and an excellent mechanical property and thermal stability, which comprises heating raw material powders of a REBaCuO system at 1050 DEG C or higher, cooling the material for solidification, pulverizing and mixing the solidified material to homogeneously disperse the structure of the solidified material, molding the material, optionally mixed with silver oxide or silver, into a predetermined shape, and reheating the molding to 1050 DEG C or higher to grow a superconducting phase.
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公开(公告)号：DE69007424D1
公开(公告)日：1994-04-21
申请号：DE69007424
申请日：1990-11-06
Applicant: INT SUPERCONDUCTIVITY TECH , NIPPON STEEL CORP , SHIKOKU ELEC POWER , RAILWAY TECHNICAL RES INST
Inventor： MURAKAMI MASATO , OYAMA TERUTSUGU , FUJIMOTO HIROYUKI , KOSHIZUKA NAOKI , SHIOHARA YU , TANAKA SHOJI
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公开(公告)号：DE4232869C2
公开(公告)日：1999-08-26
申请号：DE4232869
申请日：1992-09-30
Applicant: NSK LTD , NIPPON STEEL CORP , RAILWAY TECHNICAL RES INST , KAWASAKI HEAVY IND LTD , SHIKOKU ELEC POWER , INT SUPERCONDUCTIVITY TECH
Inventor： FUKUYAMA HIROMASA , AIHARA SATORU , MURAKAMI MASATO , FUJIMOTO HIROYUKI , KONDOH AKIHIRO , TAKAICHI HIROSHI , KOSHIZUKA NAOKI
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Patent Agency Ranking
公开(公告)号：DE69318875D1
公开(公告)日：1998-07-09
申请号：DE69318875
申请日：1993-03-26
Applicant: INT SUPERCONDUCTIVITY TECH , KAWASAKI HEAVY IND LTD , HOKURIKU ELECTRIC POWER CO , NIPPON STEEL CORP , RAILWAY TECHNICAL RES INST
Inventor： KONDOH AKIHIRO , MURAKAMI MASATO , KOSHIZUKA NAOKI , TANAKA SHOJI , KAGIYA SHOICHI , FUJIMOTO HIROYUKI
IPC: C04B35/45 , C04B35/653 , H01L39/12 , H01L39/24
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公开(公告)号：DE69314077D1
公开(公告)日：1997-10-30
申请号：DE69314077
申请日：1993-03-27
Inventor： KONDOH AKIHIRO , MURAKAMI MASATO , TAKAICHI HIROSHI , KOSHIZUKA NAOKI , TANAKA SHOJI , KAGIYA SYOICHI
IPC: C04B35/45 , C04B35/653 , H01L39/12 , H01L39/24
Abstract: A method for producing an REBaCuO oxide superconductor having large magnetic levitation force, where RE is a rare earth element selected from the group consisting of Y, Sm, Eu, Gd, Dy, Ho, Er, and Yb, is provided, which involves the steps of using a raw material mixture as the starting feed, heating the raw material mixture for partial melting, followed by cooling and solidification, pulverizing and mixing the resulting solid, shaping the resulting mixture into a given shape, placing or embedding necleants on or in the resulting shape, followed by heating for partial melting, and cooling the resulting partial melt to a substantial temperature at which a superconducting phase starts to form, followed by slow cooling, whereby the superconducting phase is preferentially formed and grown from a nucleation site.
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公开(公告)号：DE69208317T2
公开(公告)日：1996-07-04
申请号：DE69208317
申请日：1992-04-01
Applicant: INT SUPERCONDUCTIVITY TECH , HOKURIKU ELECTRIC POWER CO , SUMITOMO ELECTRIC INDUSTRIES , KAWASAKI HEAVY IND LTD , NIPPON STEEL CORP
Inventor： MURAKAMI MASATO , TAKADA TSUTOMU , YAMAGUCHI KOJI , KONDO AKIHIRO , KOSHIZUKA NAOKI
Abstract: An oxide superconductor comprising Ln BaCuO psi and PtBaCuO with a mean particle diameter of 0.1 to 10 m finely dispersed in the crystal of LnBa Cu Oy, wherein Ln represents at least one rare earth element including Y; and a process for producing the same by melting a powdery raw material comprising composite oxides of Ln, Ba and Cu, rapidly cooling the melt to effect solidification, crushing the solid, adding thereto a Pt powder, molding the mixture, heating the molding into a semi-molten state, and cooling the resulting molding.
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公开(公告)号：DE69318875T2
公开(公告)日：1999-03-04
申请号：DE69318875
申请日：1993-03-26
Applicant: INT SUPERCONDUCTIVITY TECH , KAWASAKI HEAVY IND LTD , HOKURIKU ELECTRIC POWER CO , NIPPON STEEL CORP , RAILWAY TECHNICAL RES INST
Inventor： KONDOH AKIHIRO , MURAKAMI MASATO , KOSHIZUKA NAOKI , TANAKA SHOJI , KAGIYA SHOICHI , FUJIMOTO HIROYUKI
IPC: C04B35/45 , C04B35/653 , H01L39/12 , H01L39/24
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公开(公告)号：GB2260375B
公开(公告)日：1996-05-08
申请号：GB9220628
申请日：1992-09-30
Applicant: NSK LTD , NIPPON STEEL CORP , RAILWAY TECHNICAL RES INST , KAWASAKIJUKOGYO KABUSHIKIKAISH , SHIKOKU ELEC POWER , INT SUPERCONDUCTIVITY TECH
Inventor： FUKUYAMA HIROMASA , AIHARA SATORU , MURAKAMI MASATO , FUJIMOTO HIROYUKI , KONDOH AKIHIRO , TAKAICHI HIROSHI , KOSHIZUKA NAOKI
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