Free Metal Containing Patents (Class 505/124)
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Patent number: 9662749Abstract: A method for producing a weldable titanium alloy and/or composite wire. The method includes: a) forming a green object by blending particulates of titanium sponge with one or more powdered alloying additions and cold compacting the blended mixture and subjecting the blended mixture including lubricant to pressure; b) forming a work body of alloyed titanium by heating the green object in a protected atmosphere and holding the temperature for a period of at least 4 hours, and then hot working the green object at a temperature of less than 200° C. apart from the beta transition temperature of the titanium alloy and shaping the green object to obtain an elongated profile; and c) forming the welding wire by placing the elongated profile of the work body in a rolling mill having one or more rolls disposed in series.Type: GrantFiled: March 21, 2012Date of Patent: May 30, 2017Assignee: NORSK TITANIUM ASInventors: Ola Jensrud, Arne Kolbu, Sverre Gulbrandsen-Dahl, Kevin Dring
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Publication number: 20150105261Abstract: An oxide superconducting thin film wherein nanoparticles functioning as flux pins are dispersed in the film is provided. The oxide superconducting thin film wherein the nanoparticles in the oxide superconducting thin film have a dispersing density of 1020 particles/m3 to 1024 particles/m3 is provided. The oxide superconducting thin film wherein the nanoparticles have a particle diameter of 5 nm to 100 nm is provided. A method of manufacturing an oxide superconducting thin film wherein a predetermined amount of a solution obtained by dissolving nanoparticles functioning as flux pins in a solvent is added to a solution obtained by dissolving an organometallic compound in a solvent to prepare a source material solution for an oxide superconducting thin film, and the source material solution is used to manufacture the oxide superconducting thin film through a coating-pyrolysis process is provided.Type: ApplicationFiled: May 31, 2012Publication date: April 16, 2015Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Tatsuoki Nagaishi, Genki Honda, Iwao Yamaguchi, Takaaki Manabe, Takeshi Hikata, Hiroaki Matsui, Wakichi Kondo, Hirofumi Yamasaki, Toshiya Kumagai
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Patent number: 8765053Abstract: A method for producing a Sn based alloy (15) comprising a metal matrix of a metal matrix material, wherein the metal matrix material comprises Sn, and inclusions of a compound material, further referred to as compound inclusions, wherein the compound material contains one element or a combination of elements of the group Ti, V, Zr, Hf, further referred to as dopant, and one or a plurality of other elements, in particular Sn, Cu and/or Nb. Particles of the metal matrix material, further referred to as matrix particles, are mixed with particles of the compound material, further referred to as compound particles, and the matrix particles and the compound particles are compacted during and/or after their mixing. A Sn based alloy containing finer compound inclusion of a dopant can be prepared, in order to produce Nb3Sn superconductor material with a superior current carrying capacity.Type: GrantFiled: January 27, 2010Date of Patent: July 1, 2014Assignee: Bruker BioSpin AGInventor: Florin Buta
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Patent number: 8309494Abstract: The invention provides an iron-based superconducting substance capable of bringing about superconductivity without using any toxic elements. The iron-based superconducting substance includes a composition wherein an FeTe alloy is doped with sulfur in such a way as to satisfy the following formula 1. Fe(Te1-xSx)y where 0<x<1, and 0.8<y?1 ??Formula 1 The iron-based superconducting substance takes a tetragonal PbO structure with a space group P4/nmm.Type: GrantFiled: November 4, 2009Date of Patent: November 13, 2012Assignee: National Institute for Materials ScienceInventors: Yoshihiko Takano, Yoshikazu Mizuguchi
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Patent number: 8035933Abstract: Disclosed is the structure of a persistent current switch and a control method for the same. In the switch structure, a portion of a superconducting wire to be used as a switch is formed with slits such that the flow of current is controlled by the switch, to facilitate a transition between the superconducting state and the normal state of the superconducting wire. The structure of the persistent current switch includes a first slit longitudinally extending from a first point on one end of a superconducting wire to a second point and from a third point to a fourth point, the second, third, and fourth points being arranged sequentially in a longitudinal line, and second and third slits provided at opposite sides of a region between the second point and the third point where no first slit exists.Type: GrantFiled: October 10, 2007Date of Patent: October 11, 2011Assignee: Korea Polytechnic University Industry Academic Cooperation FoundationInventors: Hee-Gyoun Lee, Gye-Won Hong, Kyeong Dal Choi, Seung Wook Lee
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Publication number: 20110245083Abstract: An article including a substrate and a layer of a homogeneous metal-oxyfluoride intermediate film disposed on the substrate, the intermediate film containing a rare earth metal, an alkaline earth metal, and a transition metal. The intermediate film has a defect density less than 20 percent and, upon thermal treatment, is capable of converting to a homogeneous rare earth metal-alkaline earth metal-transition metal-oxide superconductor film with a stoichiometric thickness greater than 1 ?m and up to 5 ?m. Also disclosed is another article including a substrate and the homogeneous superconductor film with a stoichiometric thickness greater than 1 ?m and up to 5 ?m. Further, methods of making these two articles are described.Type: ApplicationFiled: March 31, 2010Publication date: October 6, 2011Applicant: American Superconductor CorporationInventors: Srivatsan Sathyamurthy, Martin W. Rupich
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Publication number: 20110218109Abstract: A clathrate compound of formula (I): M8AxBy-x (I) wherein: M is an alkaline earth metal, a rare earth metal, an alkali metal, Cd, or a combination thereof, A is Ga, Al, In, Zn or a combination thereof; B is Ge, Si, Sn, Ni or a combination thereof; and 12?x?16, 40?y?43, x and y each is or is not an integer. Embodiments of the invention also include method of making and using the clathrate compound.Type: ApplicationFiled: November 4, 2009Publication date: September 8, 2011Inventors: Shengqiang Bai, Lidong Chen, Lin He, Li Wang, Wenbin Zhang, Yanfei Zhou
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Publication number: 20110207610Abstract: The invention has for its object for the provision of an iron-based superconducting substance capable of bringing about superconductivity without using any toxic elements. The invention provides an iron-based superconducting substance characterized by comprising a composition wherein an FeTe alloy is doped with sulfur in such a way as to satisfy the following formula 1. Fe(Te1-xSx)y where 0<x<1, and 0.8<y?1??Formula 1 The inventive iron-based superconducting substance is also characterized by taking a tetragonal PbO structure with a space group P4/nmm.Type: ApplicationFiled: November 4, 2009Publication date: August 25, 2011Inventors: Yoshihiko Takano, Yoshikazu Mizuguchi
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Publication number: 20110045985Abstract: A superconductor which comprises a new compound composition substituting for perovskite copper oxides. The superconductor is characterized by comprising a compound which is represented by the chemical formula A(TM)2Pn2 [wherein A is at least one member selected from the elements in Group 1, the elements in Group 2, or the elements in Group 3 (Sc, Y, and the rare-earth metal elements); TM is at least one member selected from the transition metal elements Fe, Ru, Os, Ni, Pd, or Pt; and Pn is at least one member selected from the elements in Group 15 (pnicogen elements)] and which has an infinite-layer crystal structure comprising (TM)Pn layers alternating with metal layers of the element (A).Type: ApplicationFiled: February 20, 2009Publication date: February 24, 2011Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCYInventors: Hideo Hosono, Hiroshi Yanagi, Toshio Kamiya, Satoru Matsuishi, Sungwng Kim, Seok Gyu Yoon, Hidenori Hiramatsu, Masahiro Hirano, Yoichi Kamihara, Takatoshi Nomura
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Publication number: 20100255998Abstract: A method for producing a Sn based alloy (15) comprising a metal matrix of a metal matrix material, wherein the metal matrix material comprises Sn, and inclusions of a compound material, further referred to as compound inclusions, wherein the compound material contains one element or a combination of elements of the group Ti, V, Zr, Hf, further referred to as dopant, and one or a plurality of other elements, in particular Sn, Cu and/or Nb. Particles of the metal matrix material, further referred to as matrix particles, are mixed with particles of the compound material, further referred to as compound particles, and the matrix particles and the compound particles are compacted during and/or after their mixing. A Sn based alloy containing finer compound inclusion of a dopant can be prepared, in order to produce Nb3Sn superconductor material with a superior current carrying capacity.Type: ApplicationFiled: January 27, 2010Publication date: October 7, 2010Applicant: Bruker BioSpin AGInventor: Florin Buta
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Patent number: 7718573Abstract: A method for producing an oxide superconductor by partially melting and solidifying the precursor of the oxide superconductor is a method wherein the precursor is placed on a substrate material containing pure metal or a compound which is meltable in the precursor when the precursor is in a partially molten state, and partially melting and solidifying the precursor in said state.Type: GrantFiled: January 22, 2004Date of Patent: May 18, 2010Assignee: Origin Electric Company, LtdInventors: Motohide Matsui, Masato Murakami
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Publication number: 20080274896Abstract: A substrate for a superconducting wire is made of Ni or Ni alloy, with a ratio of cube texture of 95% or above constant in a width direction of a substrate body, a ratio of low-angle (15 or less) grain boundary of 99% or above regularly distributed in the width direction, a thickness of 40-150 ?m, an average grain size of 100 ?m or less, and a surface roughness of RMS 50 nm or less. A method for fabricating the substrate includes rolling a Ni or Ni-alloy rod with a rectangular section; and thermally treating the rolled rod, the rolling step having a reduction ratio of 5 to 15% at each rolling, the rod being moved between rollers for the rolling process at a linear velocity of 100 m/min or less, the thermally treating process being conducted by heating above a recrystallization temperature with flowing an inert gas including hydrogen gas.Type: ApplicationFiled: September 5, 2005Publication date: November 6, 2008Inventors: Bong-Ki Ji, Byoung-Kwang Lee
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Publication number: 20080194411Abstract: A cryogenically-cooled HTS wire includes a stabilizer having a total thickness in a range of 200-600 micrometers and a resistivity in a range of 0.8-15.0 microOhm cm at approximately 90 K. A first HTS layer is thermally-coupled to at least a portion of the stabilizer.Type: ApplicationFiled: March 20, 2007Publication date: August 14, 2008Inventors: Douglas C. Folts, James MaGuire, Jie Yuan, Alexis P. Malozemoff
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Publication number: 20080161189Abstract: A superconducting electrical machine has rotor and stator assemblies. A first rotor assembly is located to rotate within a stator assembly and is spaced from the stator assembly by an air gap. A second rotor assembly is located to rotate outside the stator assembly and is also spaced from the stator assembly by an air gap. The first and second rotor assemblies have at least one superconducting field winding. The superconducting field windings are formed from a High Temperature Superconducting (HTS) material such as BSCCO-2223 or YBCO, for example. The double rotor assembly configuration provides a new technical effect over conventional rotating superconducting machines having a single rotor assembly.Type: ApplicationFiled: August 8, 2005Publication date: July 3, 2008Inventors: Clive Lewis, Graham LeFlem
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Publication number: 20080100164Abstract: An inductor-type synchronous machine includes field stators having field elements by which an N-pole and an S-pole are concentrically formed, rotors to which a rotating shaft is fixed and has N-pole inductors disposed so as to face the N-pole of the field elements and S-pole inductors disposed so as to face the S-pole of the field elements, and an armature stator having armature coils disposed so as to face the N-pole inductors and the S-pole inductors.Type: ApplicationFiled: December 16, 2005Publication date: May 1, 2008Inventors: Toru Okazaki, Shingo Ohashi, Hidehiko Sugimoto, Toshio Takeda
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Patent number: 6995119Abstract: Superconducting phases comprising magnesium diboride related composites and methods of preparation.Type: GrantFiled: October 7, 2003Date of Patent: February 7, 2006Assignee: Northwestern UniversityInventor: David C. Dunand
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Patent number: 6953770Abstract: The present invention relates to an MgB2-based superconductor that is easy to manufacture and well suited to mass production, and that exhibits excellent superconducting characteristics (such as a high critical current density) while still retaining the high critical temperature characteristics of MgB2. A powder mixture of magnesium, boron, and titanium is pressed into a pellet, and this product is sintered under an atmospheric pressure and other conditions (preferably at 600° C. or higher) to manufacture an MgB2-based superconductor in which titanium and/or a titanium compound are dispersed in polycrystalline MgB2. The composition of the MgB2-based superconductor is preferably adjusted to have an atomic ratio of Mg:B:Ti=x:2:y, 0.7<x<1.2 and 0.05<y<0.3, and more preferably 0.07<y<0.2, by adjusting the amounts in which the raw materials are added.Type: GrantFiled: May 10, 2002Date of Patent: October 11, 2005Assignee: International Superconductivity Technology Center, The Juridical FoundationInventors: Yong Zhao, Yong Feng, Yuan Wu, Takato Machi, Yasunori Fudamoto, Naoki Koshizuka, Masato Murakami
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Patent number: 6894006Abstract: A method for reducing the concentration of non-superconducting phases during the heat treatment of Pb doped Ag/Bi-2223 composites having Bi-2223 and Bi-2212 superconducting phases is disclosed. A Pb doped Ag/Bi-2223 composite having Bi-2223 and Bi-2212 superconducting phases is heated in an atmosphere having an oxygen partial pressure not less than about 0.04 atmospheres and the temperature is maintained at the lower of a non-superconducting phase take-off temperature and the Bi-2223 superconducting phase grain growth take-off temperature. The oxygen partial pressure is varied and the temperature is varied between about 815° C. and about 835° C. to produce not less than 80 percent conversion to Pb doped Bi-2223 superconducting phase and not greater than about 20 volume percent non-superconducting phases. The oxygen partial pressure is preferably varied between about 0.04 and about 0.21 atmospheres. A product by the method is disclosed.Type: GrantFiled: July 21, 2000Date of Patent: May 17, 2005Assignees: University of Chicago, American Superconductor Corp.Inventors: Victor A. Maroni, Nazarali N. Merchant, Ronald D. Parrella
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Publication number: 20040028886Abstract: By rapidly heating a precursor wire having a multifilamentary structure in which multiple composite cores in which a composite compound of an Nb—Ga compound and Nb is embedded in Nb are embedded in Nb, Ta, Nb-base alloy or Tabase alloy as a matrix material to a temperature range of 1400 to 2100° C. in 2 seconds, quenching the precursor wire at a rate of 5000° C./second or larger, and subjecting the precursor wire to additional heat treatment at a temperature range of 600 to 850° C. for 1 to 400 hours, a superconducting wire having a multifilamentary structure in which multiple composite cores in which a composite compound containing Nb3Ga of a stoichiometric composition embedded in Nb are embedded in Nb, Ta, Nb-base alloy or Tabase alloy as a matrix material is obtained.Type: ApplicationFiled: March 27, 2003Publication date: February 12, 2004Inventors: Kiyoshi Inoue, Yasuo Iijima, Akihiro Kikuchi, Yuji Yoshida
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Patent number: 6569360Abstract: The present invention provides a generic method of preparing a metal matrix composite with a textured compound. A “roller-skate” structure starting powder with a mixture of plate-like particles and smaller particles provides better flow compatibility, higher packing density, better densification and texture formation in preparing a metal matrix composite with a textured compound. In particular, the invention provides a method of preparing a textured superconducting composite wire with an improved critical current density.Type: GrantFiled: July 25, 2002Date of Patent: May 27, 2003Inventor: Hengning Wu
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Publication number: 20030096710Abstract: Superconducting phases comprising magnesium diboride related composites and methods of preparation.Type: ApplicationFiled: May 31, 2002Publication date: May 22, 2003Inventor: David C. Dunand
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Patent number: 6525002Abstract: An oxide superconductor includes a textured superconducting material including an array of defects with a neutron-fissionable element, or with at least one of the following chemical elements: uranium-238, Nd, Mn, Re, Th, Sm, V, and Ta. The array of defects is dispersed throughout the superconducting material. The superconducting material may be the RE1Ba2Cu3O7−&dgr; compound, wherein RE=Y, Nd, La, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu; the Bi2Sr2CaCu2Ox, the (Bi, Pb)2Sr2CaCu2Ox, Bi2Sr2Ca2Cu3Ox or (Bi, Pb)2Sr2Ca2Cu3Ox compound; the Tl2Ca1.5BaCu2Ox or Tl2Ca2Ba2Cu3Ox compound; or a compound involving substitution such as the Nd1+xBa2−xCu3Ox compounds. The neutron-fissionable element may be uranium-235. The oxide superconductor may include additional defects created by fission.Type: GrantFiled: May 6, 2000Date of Patent: February 25, 2003Inventor: Roy Weinstein
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Patent number: 6420318Abstract: Superconducting composite materials having particles of superconducting material disposed in a metal matrix material with a high electron-boson coupling coefficient (&lgr;). The superconducting particles can comprise any type of superconductor including Laves phase materials, Chevrel phase materials, A15 compounds, and perovskite cuprate ceramics. The particles preferably have dimensions of about 10-500 nanometers. The particles preferably have dimensions larger than the superconducting coherence length of the superconducting material. The metal matrix material has a &lgr; greater than 0.2, preferably the &lgr; is much higher than 0.2. The metal matrix material is a good proximity superconductor due to its high &lgr;. When cooled, the superconductor particles cause the metal matrix material to become superconducting due to the proximity effect. In cases where the particles and the metal matrix material are chemically incompatible (i.e.Type: GrantFiled: November 4, 1999Date of Patent: July 16, 2002Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventor: Matthew J. Holcomb
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Patent number: 6365553Abstract: The invention provides an oxide superconductor capable of sufficiently withstanding external forces such as a large electromagnetic force and thermal stresses accompanying rapid heating and cooling while in service, and internal stresses so as to be able to exhibit a high trapped magnetic field stably over a long period of time. The oxide superconductor such as, for example, “a copper oxide superconductor containing rare earth elements”, is composed of an oxide superconductive bulk body impregnated with a low melting metal or an oxide superconductive bulk body impregnated with a low melting metal and having a thin film of the low melting metal formed on the external surface thereof. Such oxide superconductors as described above can be produced by a process whereby the oxide superconductive bulk body kept in an atmosphere of reduced pressure is brought into contact with the low melting metal.Type: GrantFiled: August 25, 2000Date of Patent: April 2, 2002Assignees: International Superconductivity Technology Center, Railway Technical Research InstituteInventors: Masaru Tomita, Masato Murakami
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Publication number: 20020004463Abstract: A composite superconductor having an interior component of multiple filaments of superconducting Bi-2223 sheathed in a Ag or Ag alloy material, and a RE, TI or Hg based superconductor surrounding the interior component.Type: ApplicationFiled: April 26, 2001Publication date: January 10, 2002Applicant: The University of ChicagoInventors: Uthamalingam Balachandran, Milan Lelovic, Nicholas G. Eror
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Patent number: 6239079Abstract: A high temperature superconductor composite material capable of working at liquid nitrogen and higher temperatures K>77 has a sintered compound of intermixed components including high temperature superconductor ceramics, a silver dope, and sintering products of interaction of the superconductor ceramics and the silver dope with silicone material.Type: GrantFiled: September 29, 1999Date of Patent: May 29, 2001Inventors: M. I. Topchiashvili, A. E. Rokhvarger
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Patent number: 6172007Abstract: An oxide superconductor which exhibits an uniform and high critical current is disclosed. Further, a method of manufacturing this oxide superconductor is disclosed, namely, a RE—Ba—Cu—O oxide superconductor (RE is one or more kinds of rare earth elements including Y) by performing a treatment, which includes at least a burning process to be performed in a range of temperatures that are higher than a melting point of a raw material mixture containing a RE-compound raw material, Ba-compound raw material and a Cu-compound raw material, on the raw material mixture. This method further includes a step of crushing the raw material mixture into particles and establishing the mean particle diameter of one or all of the raw materials as ranging from 50 to 80 &mgr;m.Type: GrantFiled: December 14, 1998Date of Patent: January 9, 2001Assignee: Dowa Mining Co., Ltd.Inventors: Kazuya Yamaguchi, Shuichi Kohayashi, Shuetsu Haseyama, Shuji Yoshizawa
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Patent number: 6063736Abstract: There is provided RE-Ba-Cu-O oxide bulk superconductors in which considerably high critical current density is obtained at relatively high temperature. In the present RE-Ba-Cu-O bulk superconductors, RE is a combination of two or more elements selected from La, Nd, Sm, Eu and Gd, at least one of them being La, Nd and Sm and the remainder being Eu or Gd, in which a parent phase thereof comprises a RE.sub.1+x Ba.sub.2-x Cu.sub.3 O.sub.y crystal wherein -0.1<x<0.2 and 6.7<y<7.1, and 5 to 50% by volume of a RE.sub.2 Ba.sub.2 CuO.sub.5 fine dispersed phase having partide size of 0.01 to 0.5 .mu.m. Preferably, a total amount of Eu and Gd in the RE site is 40% by weight or less, while a slight amount of Pt may be added. As a result, the critical current density at liquid nitrogen temperature can be improved to 10,000 A/cm.sup.2 or more under a condition where a magnetic field of 3T is impressed parallel to c axis of the crystal.Type: GrantFiled: June 30, 1999Date of Patent: May 16, 2000Assignees: Superconductivity Research Laboratory, Iwate Prefectual GovernmentInventors: Muralidar Miryara, Masato Murakami, Koji Segawa, Koichi Kamada, Takashi Saitho
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Patent number: 6038461Abstract: There are disclosed a high temperature superconductive material which can be plastically deformed, processed optionally into predetermined configurations and industrially mass produced and a method of manufacturing a formed body of the high temperature superconductive material. Mixed is a powder raw material which is mainly composed of: 10 to 50 mol % of at least one amide or nitride of alkali metal of Li, Na or K; 10 to 60 mol % of cyanide containing at least one metal selected from aluminum, copper, silver or gold; 5 to 50 mol % of at least one pure metal selected from aluminum, copper, silver or gold; and 10 mol % or less of at least one alkaline earth metal selected from Be, Mg, Ca, Sr or Ba. The powder raw material is pressed, and heated and sintered at the temperature of 673 K to 1553 K. In this manner, obtained is the plastically deformable high temperature superconductive material which can be optionally processed through forging, rolling and the like.Type: GrantFiled: April 24, 1998Date of Patent: March 14, 2000Inventors: Yoshifumi Sakai, Itsuko Sakai
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Patent number: 5998336Abstract: A composite superconducting material made of coated particles of ceramic superconducting material and a metal matrix material. The metal matrix material fills the regions between the coated particles. The coating material is a material that is chemically nonreactive with the ceramic. Preferably, it is silver. The coating serves to chemically insulate the ceramic from the metal matrix material. The metal matrix material is a metal that is susceptible to the superconducting proximity effect. Preferably, it is a NbTi alloy. The metal matrix material is induced to become superconducting by the superconducting proximity effect when the temperature of the material goes below the critical temperature of the ceramic. The material has the improved mechanical properties of the metal matrix material. Preferably, the material consists of approximately 10% NbTi, 90% coated ceramic particles (by volume). Certain aspects of the material and method will depend upon the particular ceramic superconductor employed.Type: GrantFiled: February 26, 1997Date of Patent: December 7, 1999Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventor: Matthew J. Holcomb
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Patent number: 5994275Abstract: An oxide superconductor article comprises silver and an oxide superconductor having the formula Bi.sub.2-y Pb.sub.y Sr.sub.2 Ca.sub.2 O.sub.10+x, where 0.ltoreq.x.ltoreq.1.5, and 0.3.ltoreq.y.ltoreq.0.4, the oxide superconductor characterized by a critical current transition temperature of greater than 111.0 K as defined by zero resistance by a four point linear probe method with zero resistance corresponding to a resistivity of less that 10.sup.-8 .OMEGA.-cm.Type: GrantFiled: January 8, 1997Date of Patent: November 30, 1999Assignee: American Superconductor CorporationInventors: Alexander Otto, Gilbert N. Riley, Jr., William L. Carter
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Patent number: 5972846Abstract: Articles according to the invention comprise a superconductive cuprate (e.g., YBa.sub.2 Cu.sub.3 O.sub.7) body containing elongate grains measuring at least about 10 .mu.m along the long axis and having an aspect ratio of at least 10:1. Bodies according to the invention can have relatively high critical current density, as compared to analogous non-textured bodies.Type: GrantFiled: May 27, 1992Date of Patent: October 26, 1999Assignee: Lucent Technologies Inc.Inventors: Sungho Jin, Richard Curry Sherwood, Thomas Henry Tiefel
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Patent number: 5958840Abstract: An oxide superconductor which has high mechanical strength and exhibits favorable magnetic properties and high resistance to environment. Further, a method of manufacturing this oxide superconductor, namely, a method of manufacturing a RE--Ba--Cu--O oxide superconductor (RE is one or more kinds of rare earth elements including Y) by performing a treatment, which includes at least a burning process to be performed in a range of temperatures that are higher than the melting point of a raw material mixture containing a RE-compound raw material, a Ba-compound raw material and a Cu-compound raw material, on the aforesaid raw material mixture. This method further comprises the addition step of adding 1 to 30 in percent by weight (wt %) of Ag to the raw material mixture, and the crystallization step of melting the raw material mixture, to which Ag is added, at a temperature that is not lower than a temperature at which the raw material mixture is decomposed and fused into the RE.sub.2 BaCuO.sub.Type: GrantFiled: July 30, 1997Date of Patent: September 28, 1999Assignees: Dowa Mining Co., Ltd., Chubu Electric Power Company, IncorporatedInventors: Shuichi Kohayashi, Shuetsu Haseyama, Shuji Yoshizawa, Shigeo Nagaya
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Patent number: 5952268Abstract: The present invention relates to method of preparing a superconductor material consisting in preparing a precursor constituted by a powder of Ba.sub.2 Ca.sub.n-1 Cu.sub.n+1 O.sub.x or Ba.sub.2 Ca.sub.n-1 Cu.sub.n+1 O.sub.x where n is an integer greater than 1 and x is greater than 2n+2; in mixing said powder with silver oxide power, optionally in the presence of excess copper oxide, in a proportion of one mole of precursor for one to three moles of silver oxide; and in heating to high temperature and high pressure.Type: GrantFiled: July 23, 1996Date of Patent: September 14, 1999Assignee: AlcatelInventors: Miguel Angel Alario-Franco, Catherine Chaillout, Jean-Jacques Capponi, Jean-Louis Tholence, Benedicte Souletie
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Patent number: 5840897Abstract: A metalorganic complex of the formula:MA.sub.y Xwherein:M is a y-valent metal;A is a monodentate or multidentate organic ligand coordinated to M which allows complexing of MA.sub.y with X;y is an integer having a value of 2, 3 or 4; each of the A ligands may be the same or different; andX is a monodentate or multidentate ligand coordinated to M and containing one or more atoms independently selected from the group consisting of atoms of the elements C, N, H, S, O and F.The metal M may be selected from the group consisting of Cu, Ba, Sr, La, Nd, Ce, Pr, Sm, Eu, Th, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Bi, Tl, Y, Pb, Ni, Pd, Pt, Al, Ga, In, Ag, Au, Co, Rh, Ir, Fe, Ru, Sn, Li, Na, K, Rb, Cs, Ca, Mg, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, and W. A may be selected from the group consisting of .beta.-diketonates and their sulfur and nitrogen analogs, .beta.-ketoesters and their sulfur and nitrogen analogs, cyclopentadienyls, alkyls, perfluoroalkyls, alkoxides, perfluoroalkoxides, and Schiff bases.Type: GrantFiled: June 7, 1995Date of Patent: November 24, 1998Assignee: Advanced Technology Materials, Inc.Inventors: Peter S. Kirlin, Duncan W. Brown, Thomas H. Baum, Brian A. Vaarstra, Robin A. Gardiner
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Patent number: 5698497Abstract: Carbonaceous materials based on the fullerene molecules have been developed which allow for superconductivity. The fullerene materials are soluble in common solvents.Type: GrantFiled: June 13, 1994Date of Patent: December 16, 1997Assignee: Lucent Technologies Inc.Inventors: Robert Cort Haddon, Arthur Foster Hebard, Donald Winslow Murphy, Matthew Jonathan Rosseinsky
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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: 5547921Abstract: A superconducting film including 0.1-5% by weight of magnesium oxide wherein the superconducting film has a thickness in a range from 300 to 1000 .mu.m. A superconducting device for magnetic shielding comprises: a substrate; and a superconducting layer supported by the substrate, the superconducting layer including grains of a Bi-type superconducting oxide so that the superconducting layer has a critical temperature higher than -196.degree. C., the superconducting layer having a thickness in a range from 300 to 1,000 .mu.m, the superconducting layer including 0.1-5% by weight of magnesium oxide, where the superconducting device has a laminated structure including the substrate and the superconducting layer. A process for producing a superconducting film comprises the steps of: firing a mixture of calcined powders of a superconducting oxide and 0.1-5% by weight of magnesium oxide powders at a temperature at which the superconducting oxide is partially melted.Type: GrantFiled: January 19, 1995Date of Patent: August 20, 1996Assignee: NGK Insulators, Ltd.Inventors: Makoto Tani, Tooru Hayase, Hideki Shimizu, Kazuyuki Matsuda
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Patent number: 5545613Abstract: A method of preparing a superconducting oxide by combining the metallic elements of the oxide to form an alloy, followed by oxidation of the alloy to form the oxide. Superconducting oxide-metal composites are prepared in which a noble metal phase intimately mixed with the oxide phase results in improved mechanical properties. The superconducting oxides and oxide-metal composites are provided in a variety of useful forms.Type: GrantFiled: July 11, 1994Date of Patent: August 13, 1996Assignee: Massachusetts Institute of TechnologyInventors: Gregory J. Yurek, John B. VanderSande
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Patent number: 5510323Abstract: An oxide superconductor comprising a perovskite type oxide compound of thallium, strontium, calcium and copper or thallium, strontium, balium, calcium and copper is produced by absorbing thallium in a gaseous phase into a mixture of strontium oxide or strontium oxide and barium oxide, calcium oxide, and copper oxide or a mixture of compounds capable of producing these oxides upon firing. From this superconductor are provided a superconductor wire material, tape-shaped wire material, coil, thin film, magnet, magnetic shielding material, printed circuit board, measuring device, computer, power storing device and etc.Type: GrantFiled: April 7, 1995Date of Patent: April 23, 1996Assignee: Hitachi, Ltd.Inventors: Tomoichi Kamo, Seizi Takeuchi, Shinpei Matsuda, Atsuko Soeta, Takaaki Suzuki, Yutaka Yoshida
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Patent number: 5508257Abstract: Superconducting composite comprising a matrix made of superconducting sintered mass composed of perovskite type or quasi-perovskite type oxide and metal phase dispersed in the superconducting mass with a proportion of from 10 to 70 volume % with respect to said composite. The metal phase may consist of at least one of Cu, Ag, Au, Pt, Ni and Zn or their alloys. The superconducting sintered mass may be Ba-Y-Cu-O type compound oxide.Type: GrantFiled: February 17, 1994Date of Patent: April 16, 1996Assignee: Sumitomo Electric Industries, Ltd.Inventors: Kenichiro Sibata, Takeshi Yamaguchi, Shuji Yazu, Tetsuji Jodai
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Patent number: 5508256Abstract: A method of producing a high-temperature oxide superconducting material, which comprises the steps of (a) preparing a material corresponding to an oxide superconductor of the perovskite type structure consisting essentially of a first member selected from the group consisting yttrium, lanthanoids, thallium and bismuth; at least one alkaline earth metal; copper; and oxygen and (b) heating the material in the presence of an alkali metal selected from the group consisting of potassium, sodium, rubidium and cesium to a temperature around the melting point of the alkali metal or to a higher temperature for a time sufficient to effect grain growth in the superconductor material, thereby to produce the superconductor containing the alkali metal in an amount not larger than 4 mole % based on the first member.Type: GrantFiled: June 23, 1994Date of Patent: April 16, 1996Assignee: Hitachi, Ltd.Inventors: Teruo Kumagai, Tsuneyuki Kanai, Atsuko Soeta, Takaaki Suzuki, Kazutoshi Higashiyama, Tomoichi Kamo, Shinpei Matsuda, Kunihiro Maeda, Akira Okayama, Hideyo Kodama, Akira Yoshinari, Yoshimi Yanai
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Patent number: 5486501Abstract: BaCuO.sub.2.5 containing precursors for superconducting materials and process for making shaped superconductor articles therefrom.Type: GrantFiled: February 9, 1994Date of Patent: January 23, 1996Inventor: Shome N. Sinha
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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: 5472527Abstract: A method for forming unsegregated metal oxide-silver composites includes preparing a precursor alloy comprising silver and precursor elements of a desired metal oxide and oxidizing the alloy under conditions of high oxygen activity selected to permit diffusion of oxygen into silver while significantly restricting the diffusion of the precursor elements into silver, such that oxidation of the precursor elements to the metal oxide occurs before diffusion of the metallic elements into silver. Further processing of the metal oxide composite affords an oxide superconducting composite with a highly unsegregated microstructure.Type: GrantFiled: June 24, 1993Date of Patent: December 5, 1995Assignee: American Superconductor CorporationInventors: Alexander Otto, Lawrence J. Masur, Eric R. Podtburg, Kenneth H. Sandhage
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Patent number: 5470821Abstract: Composite bulk superconducting materials having desirable physical, measured transport current density and high T.sub.c superconducting characteristics are provided which comprise a first matrix of superconducting ceramic oxide crystalline grains with a second matrix of elemental metal (gold, silver, palladium and tin) situated within the interstices between the crystalline grains. Preferably, each matrix is a continuous phase within the composite material, with the ceramic oxide preferably being present at a level of at least about 80% by weight, whereas the elemental metal is present at a level of up to about 20% by weight. In fabrication procedures, a precursor superconducting ceramic oxide is first prepared and reduced to a fine powder size; this is mixed with powdered elemental metal, and the mixture is compressed using high compaction pressures on the order of 14 tons/cm.sup.2 or greater to form a body, which is then sintered to yield the composite.Type: GrantFiled: February 15, 1995Date of Patent: November 28, 1995Assignees: The University of Kansas, Midwest Superconductivity, Inc.Inventors: Kai W. Wong, Xin Fei, Ying Xin, Yi-Han Kao
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Patent number: 5444425Abstract: A flux-trapped superconducting magnet which is formed of high transition temperature superconducting mixture doped with a magnetic material having a Curie temperature below the transition temperature of the superconducting mixture.Type: GrantFiled: February 28, 1994Date of Patent: August 22, 1995Assignee: The Regents of the University of ColoradoInventors: Allen M. Hermann, Gol A. Naziripour, Timir Datta
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Patent number: 5413981Abstract: A method for manufacturing the oxide superconductor according to the present invention comprises the steps of: mixing a starting material including Bi, Sr, Ca and Cu such that a mole ratio of Bi, Sr, Ca and Cu is 2:2+a:1+b:2+c, wherein a.gtoreq.0, b.gtoreq.0, c.gtoreq.0, and 0<a+b+c<3; melting the mixed material at a temperature of 900.degree. C.-1500.degree. C.; quenching rapidly the molten material; and annealing the quenched material at a partial molten temperature of 800.degree. C.-1000.degree. C. This method gives product wherein a precipitate of at least one compound in the group SrO, CuO and (Ca.sub.1-x Sr.sub.x).sub.2 CuO.sub.3 (wherein 0.gtoreq.x<1) is finely dispersed in the superconducting crystal of Bi.sub.2 Sr.sub.2 Ca.sub.1 Cu.sub.2 O.sub.y (wherein y is about 8). The precipitates act as flux pinning centers.Type: GrantFiled: July 19, 1993Date of Patent: May 9, 1995Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kunihiko Egawa, Toshio Umemura, Shinichi Kinouchi, Mitsunobu Wakata, Shin Utsunomiya, Ayumi Nozaki
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Patent number: 5338507Abstract: 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: August 29, 1991Date of Patent: August 16, 1994Assignee: Hewlett-Packard CompanyInventors: John T. Anderson, V. K. Nagesh, Richard C. Ruby