Utilizing Sol Or Gel Patents (Class 505/440)
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Patent number: 8088503Abstract: A superconducting article includes a substrate having an untextured metal surface; an untextured barrier layer of La2Zr2O7 or Gd2Zr2O7 supported by and in contact with the surface of the substrate; a biaxially textured buffer layer supported by the untextured barrier layer; and a biaxially textured superconducting layer supported by the biaxially textured buffer layer. Moreover, a method of forming a buffer layer on a metal substrate includes the steps of: providing a substrate having an untextured metal surface; coating the surface of the substrate with a barrier layer precursor; converting the precursor to an untextured barrier layer; and depositing a biaxially textured buffer layer above and supported by the untextured barrier layer.Type: GrantFiled: January 30, 2009Date of Patent: January 3, 2012Assignees: UT-Battelle, LLC, The Regents of the University of CaliforniaInventors: Mariappan Parans Paranthaman, Srivatsan Sathyamurthy, Tolga Aytug, Paul N Arendt, Liliana Stan, Stephen R Foltyn
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Publication number: 20110021360Abstract: The superconductive nanocomposite is a composition formed by nanoparticles of a high temperature superconductor blended with a polymer matrix containing natural rubber and polyethylene. The high temperature superconductor is preferably a bismuth-based superconductor (BSCCO) having a particle size of about 21 nm, but may be any other high temperature or Type II ceramic, metal oxide superconductor. The superconductor nanoparticles comprise about 15% of the weight of natural rubber in the composition. The polyethylene is preferably low density polyethylene and may comprise between 0% up to about 40% of the weight of natural rubber in the composition. The nanocomposite may be prepared by blending the components and roll milling the rubber.Type: ApplicationFiled: July 22, 2009Publication date: January 27, 2011Inventors: Ahmed Abdullah S. Al-Ghamdi, El-Sayed El-Badaway H. El-Mossalamy, Farid Mahmoud El-Tantawy, Nadia Abdel Aal
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Publication number: 20100204049Abstract: The present invention relates to a method of preparing an oxide superconducting film, the method includes reacting a metal acetate containing metal M selected from the group consisting of lanthanum, neodymium and samarium with fluorocarboxylic acid having not less than three carbon atoms, reacting barium acetate with fluorocarboxylic acid having two carbon atoms, reacting copper acetate with fluorocarboxylic acid having not less than two carbon atoms, respectively, followed by refining reaction products, dissolving the reaction products in methanol such that a molar ratio of the metal M, barium and copper is 1:2:3 to prepare a coating solution, and coating a substrate with the coating solution to form a gel film, followed by calcining and firing the gel film to prepare an oxide superconducting film.Type: ApplicationFiled: April 21, 2010Publication date: August 12, 2010Inventors: Takeshi ARAKI, Koichi Nakao, Izumi Hirabayashi
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Patent number: 7625843Abstract: There is provided a method of fabricating a precursor solution for a metal organic deposition method using a superconducting oxide as a starting material, wherein the method includes dispersing a superconducting material powder in a TFA acid aqueous solution, heating to dissolve the powder in the TFA solution, increasing a temperature of a hot substrate if the powder is completely dissolved and the solution is clear, continuously heating until the solution is vaporized and is in a viscous jelly state, stopping heating if the solution loses its flowing property completely, cooling the solution, and dissolving the compound in the jelly state, hardened at a room temperature, into an organic solvent to provide a metal organic deposition solution for coating. There is also provided a method of fabricating a thin film-type superconductor using a metal organic deposition method.Type: GrantFiled: January 13, 2006Date of Patent: December 1, 2009Assignee: Korea Institute of Machinery & MaterialsInventors: Gye-Won Hong, Hee-Gyon Lee, Sang-Im Yoo, Jai-Moo Yoo
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Publication number: 20080139393Abstract: An oxide superconductor film formed on a substrate includes an oxide containing at least one metal M selected from the group consisting of yttrium and lanthanoid metals, provided that cerium, praseodymium, promethium and ruthenium are excluded, and barium and copper, in which the film has an average thickness of 350 nm or more, an average amount of residual carbon of 3×1019 atoms/cc or more, and an amount of residual fluorine in a range of 5×1017 to 1×1019 atoms/cc, and in which, when divided the film into a plurality of regions from a surface of the film or from an interface between the film and the substrate, each region having a thickness of 10 nm, atomic ratios of copper, fluorine, oxygen and carbon between two adjacent regions are in a range of 1/5 times to 5 times.Type: ApplicationFiled: September 18, 2007Publication date: June 12, 2008Inventor: Takeshi ARAKI
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Patent number: 6821930Abstract: An aqueous solution of mixed metal acetate including one kind or more of element selected from lanthanide series and yttrium, barium and copper is mixed with trifluoroacetic acid to prepare a solution of mixed metal trifluoroacetate. From a solution of mixed metal trifluoroacetate obtained thus, purified mixed metal trifluoroacetate of which total content of water and acetic acid is 2% by weight or less is prepared. With purified mixed metal trifluoroacetate, an oxide superconductor of excellent performance may be prepared.Type: GrantFiled: May 20, 2003Date of Patent: November 23, 2004Assignees: Kabushiki Kaisha Toshiba, International Superconductivity Technology CenterInventors: Takeshi Araki, Katsuya Yamagiwa, Izumi Hirabayashi
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Patent number: 6572916Abstract: Coatings especially for superconductive strip conductors, as well as methods of applying the coatings, are addressed. Exemplary coatings include aluminum oxide in an aqueous suspension, with aluminum oxide particles contained in the suspension having size typically between 0.5-10 &mgr;m.Type: GrantFiled: January 4, 2001Date of Patent: June 3, 2003Assignee: Vacuumschmelze GmbHInventors: Arnold Meyer, Jens Müller, Bernhard Fischer, Stefan Kautz, Bernhard Roas, Helmut Helldörfer
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Patent number: 6559103Abstract: A process is provided for preparing solid superconducting mixed-metal oxides whereby the superconductor can be formed into any predetermined shape by way of viscous sol precursors. The superconductors are also formed by this process into homogeneous phases.Type: GrantFiled: March 17, 1989Date of Patent: May 6, 2003Assignee: The Boeing CompanyInventors: Brad Lee Kirkwood, Thomas S. Luhman, Ronald Roy Stephenson, Michael Strasik
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Patent number: 6387852Abstract: There is described a method of applying insulative coating on high temperature superconductors and low temperature superconductors from sol-gel solutions prepared from Zr, or Zr with one of Mg, Y, Ce, In and Sn based precursor materials. The solution is prepared with isopropanol as a solvent and acetyl acetone as a catalyst. The conductors are dipped into the solution and thereafter dried at a temperature effective to evaporate the solvent. Thereafter, heat treatment in the presence of oxygen is applied at a temperature sufficient to oxidize the precursors to result in a ceramic insulative coating on the conductor.Type: GrantFiled: October 9, 2001Date of Patent: May 14, 2002Assignee: Florida State UniversityInventors: Erdal Celik, Yusuf Hascicek, Ibrahim Mutlu
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Patent number: 5981445Abstract: The new preparation process for making fine high specific surface ceramic powders suitable as catalysts or precursors for ceramics uses lanthanum (or other rare earth lanthanide) oxide as one of the precursors. The oxide is mixed with water to form a liquid slurry, whereby it is transformed to the hydroxide by reaction with water. The resulting hydroxide slurry, which can be milled to reduce the particle size and to speed up the reaction, is then combined, while stirring vigorously to assure homogenous mixing, with a solution of required amount of remaining metal nitrate precursors, for example strontium and cobalt nitrates. The reaction between lanthanum hydroxide and transition metal nitrates produces a colored (color depending on the transition metal) slurry consisting of metal hydroxides suspended in aqueous nitrate solution with pH>2. This perovskite precursor slurry is spray-frozen and freeze dried.Type: GrantFiled: June 17, 1996Date of Patent: November 9, 1999Assignee: Corporation de I'Ecole PolytechniqueInventors: Jitka Kirchnerova, Danilo Klvana
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Patent number: 5942376Abstract: Solution films of a photosensitive metal arylketone alcoholate are micro-patterned by exposure to ultraviolet radiation under a mask. The resultant patterns are developed in an apolar solvent and annealed to provide thin film metal oxides for use in integrated circuits.Type: GrantFiled: August 14, 1997Date of Patent: August 24, 1999Assignees: Symetrix Corporation, Mitsubishi Materials CorporationInventors: Hiroto Uchida, Nobuyuki Soyama, Kensuke Kageyama, Katsumi Ogi, Michael C. Scott, Larry D. McMillan, Carlos A. Paz de Araujo
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Patent number: 5703021Abstract: A description is given of superconducting substances having a content of Bi, Sr, Ca and Cu, and of processes for their preparation from the metal oxides within a range which is specified by the overall composition Bi.sub.a (Sr,Ca).sub.b -Cu.sub.6 O.sub.x, where a=3-24 and b=3.23-24, with an Sr/Ca atomic ratio of 1:9-9:1 and a Bi:(Ca+Sr) atomic ratio of 0.3-1.5. The transition temperature is at least 60 K. The principal phase crystallizes in the orthorhombic system. The pure compounds Bi.sub.4 (Sr,Ca).sub.4 Cu.sub.2 O.apprxeq..sub.12 and Bi.sub.4 (Sr,Ca).sub.6 Cu.sub.4 O.apprxeq..sub.20.Type: GrantFiled: June 7, 1995Date of Patent: December 30, 1997Assignee: Hoechst AktiengesellschaftInventors: Hans-Georg von Schnering, Winfried Becker, Martin Schwarz, Bernhard Hettich, Martin Hartweg, Leonhard Walz, Thomas Popp
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Patent number: 5656574Abstract: The fabrication of superconducting wires and rods having desired and consistent electrical and mechanical properties, in particular those based on Yttrium Barium Copper Oxide (YBCO) and Bismuth Strontium Calcium Copper Oxide (BSCCO), is disclosed. The first fabrication step is to form an extrudable paste by mixing YBCO or BSCCO superconducting powder with a set of organic additives, which include binder, plasticizer, lubricant, dispersant, and a solvent. The following additional steps are performed on both YBCO and BSCCO based wires or rods: (i) using a piston extruder to extrude the superconducting wire or rod; (ii) drying the wire or rod to remove the solvent; and (iii) subjecting the wire or rod to a binder burn-out treatment to remove the remaining organic additives. In addition, YBCO wires and rods also require a sintering step, while BSCCO wires and rods also require cold isostatic pressing and heat treatment steps.Type: GrantFiled: January 13, 1995Date of Patent: August 12, 1997Assignee: University of HoustonInventors: Krishnaswamy Ravi-Chandar, Devamanohar Ponnusamy, Kamel Salama
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Patent number: 5620945Abstract: Processes are provided for forming a superconductive composite, comprising a superconductive metal oxide and a ceramic. The composite may be formed in any desired shape. Liquid nitrogen can be held around the superconductor longer and delivered in a more controlled fashion and the composite has improved resistance to shatter and thermal shock. The ceramic also provides protection from atmospheric deterioration of the superconductive oxide.Type: GrantFiled: June 5, 1995Date of Patent: April 15, 1997Assignee: The Boeing CompanyInventors: Anna L. Baker, Michael Strasik
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Patent number: 5589441Abstract: Processes are provided for forming a superconductive composite, comprising a superconductive metal oxide and a ceramic. The composite may be formed in any desired shape. Liquid nitrogen can be held around the superconductor longer and delivered in a more controlled fashion and the composite has improved resistance to shatter and thermal shock. The ceramic also provides protection from atmospheric deterioration of the superconductive oxide.Type: GrantFiled: August 19, 1994Date of Patent: December 31, 1996Assignee: The Boeing CompanyInventors: Anna L. Baker, Michael Strasik
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Patent number: 5563117Abstract: In the production of a 124-type or 123-type superconductor by a sol-gel method using alkoxides of respective metals, the use of a compound wherein a secbutoxy group and a hydroxy group are coordinated with a copper atom gives a superconductor composed of flat particles having a broad C plane. The dimensional ratio defined by l/d is at least 6.7 in the case of the 124-type or is at least 8.4 in the case of the 123-type. It shows a superconducting property at a liquid nitrogen temperature. This superconductor shows a higher critical current density than one obtained by a sintering method.Type: GrantFiled: December 15, 1994Date of Patent: October 8, 1996Assignees: Kyocera Corporation, International Superconductivity Technology Center, Sanyo Electric Co., Ltd.Inventors: Shinichi Koriyama, Takaaki Ikemachi, Hisao Yamauchi
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Patent number: 5552370Abstract: A method for making metal/ceramic superconductor thick film structures including the steps of preparing a silver/superconductor ink, applying the ink to a substrate, evaporating the ink's binder, decomposing a silver compound in the residue to coat the superconductor grains, sintering the coated superconductor grains, and oxygenating the superconductor grains through the silver coating. The resultant inter-granular silver increases the critical current and mechanical strength of the superconductor.Type: GrantFiled: January 18, 1994Date of Patent: September 3, 1996Assignee: Hewlett-Packard CompanyInventors: John T. Anderson, V. K. Nagesh, Richard C. Ruby
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Patent number: 5523284Abstract: In accordance this invention, there is provided a process for making a bulk superconductive material. In the first step of this process, a diffusion couple is formed from superconductor oxide and impurity oxide. Thereafter, the diffusion couple is heated to a temperature in excess of 800 degrees Centigrade, cooled at a controlled rate, and annealed.Type: GrantFiled: September 30, 1994Date of Patent: June 4, 1996Assignee: Alfred UniversityInventors: James G. Fagan, Jr., Vasantha R. W. Amarakoon
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Patent number: 5482918Abstract: A method for producing microcomposite powders for use in superconducting and non-superconducting applications.Type: GrantFiled: February 7, 1994Date of Patent: January 9, 1996Assignee: The United States of America as represented by the Secretary of the InteriorInventors: Michael A. Maginnis, David A. Robinson
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Patent number: 5480862Abstract: Method for the preparation of a precursor for a superconductor, comprising the addition of a condensation product to an aqueous solution of metal salts, the total or partial removal of water from the mixture thus obtained, the subsequent processing of the viscous mass obtained after having removed part of the water or the calcination of the solid gel obtained after having substantially removed all the water, wherein the condensation product is a product of esterification of citric acid with ethylene glycol prepared separately and the solution of metal salts substantially is a solution of acetates in water and acetic acid.Type: GrantFiled: July 30, 1993Date of Patent: January 2, 1996Assignee: Pirelli Cavi S.p.A.Inventor: Giorgio S. Miszenti
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Patent number: 5304533Abstract: A process for producing a superconductor of an oxide system, which comprises uniformly mixing metal elements for constituting the oxide system at least partly in the form of alkoxides having CN.sup.--, X.sup.-- wherein A is a halogen atom and/or an amine, with the rest, if any, being in the form of acetylacetonates, carboxylates and/or water-soluble inorganic compounds to obtain a homogeneous mixture, and sintering the mixture.Type: GrantFiled: August 24, 1988Date of Patent: April 19, 1994Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Toshio Kobayashi, Fusaoki Uchikawa, Kenji Nomura, Fumio Fujiwara, Sigeru Matsuno, Masao Morita, Shouichi Yokoyama