American Superconductor Corporation

Other

Industrial Research Limited

Abb Technology Ag

Alexander Otto

Gilbert N Riley, Jr

William L Carter

Eric R Podtburg

Martin W Rupich

Qi Li

Elliott D Thompson

Gregory L Snitchler

Patrick John Walsh

Kenneth Henry Sandhage

Craig J Christopherson

Lawrence J Masur

Cornelis Leo Hans Thieme

Steven Fleshler

Ralph P Mason

Bruce B Gamble

Leslie G Fritzemeier

Peter R Roberts

John D Scudiere

Alexis P Malozemoff

Christopher A Craven

Jeffrey M Seuntjens

Robert E Schwall

William L Barnes

Peter D Antaya

Henry C Valcour, Iii

Dingan Yu

Jeffrey D Schreiber

James F Maguire

Swarn S Kalsi

John Peter Voccio

Martin Lakner

Jie Yuan

Willi Paul

Dietrich Bonmann

Jeffery Lewis Tallon

Harry Zueger

Robert George Buckley

Donald Mark Pooke

John Gannon

Michael Staines

Cornelis L Thieme

Michael A Tanner

Robert C Diehl

Subramaniam Anandakugan

Hong Cai

David Crotzer

Dana Krause

Henry C Valcour

Henry C Valcour Iii

Gilber N Riley

Reinforced high temperature superconducting silver wire and materials, and methods of producing reinforced high temperature superconducting silver composite wire. More specifically reinforcement materials and assemblies for attaining much higher stress, bend and surface indent tolerances at practical conductor dimensions are described. The reinforced wire or methods can include a silver wire core and a layer of high strength reinforcing metal.

Reinforced high temperature superconducting silver wire

A method includes locating a defect in a first segment of high temperature superconducting wire. A second segment of high temperature superconducting wire is then positioned onto the first segment of high temperature superconducting wire such that the second segment of high temperature superconducting wire overlaps the defect. A path is then created such that current flows through the second segment of high temperature superconducting wire. The first segment of high temperature superconducting wire and second segment of high temperature superconducting wire are then laminated together.

Mitigating the effects of defects in high temperature semiconductor wires

Under one aspect, a laminated, spliced superconductor wire includes a superconductor joint, which includes (i) first and second superconductor wires, each wire including a substrate, a superconductor layer overlying the substrate, and a cap layer overlying the superconductor layer; and (ii) a conductive bridge, the conductive bridge including a substrate, a superconductor layer overlying the substrate, and a cap layer overlying the superconductor layer, wherein the cap layer of the conductive bridge is in electrically conductive contact with a portion of the cap layer of each of the first and second superconductor wires through an electrically conductive bonding material. The spliced wire also includes (b) a stabilizer structure surrounding at least a portion of the superconductor joint, wherein the superconductor joint is in electrical contact with the stabilizer structure; and (c) a substantially nonporous electrically conductive filler, wherein the filler substantially surrounds the superconductor joint.

Low resistance splice for high temperature superconductor wires

A two-sided joint for splicing two laminated wires together, while preserving the mechanical integrity of the wire is disclosed. The two-sided joint can splice two laminated HTS wires having tapered ends and includes a bottom strap and a top strap. Under one aspect, a laminated, spliced superconductor wire includes a superconductor joint, which includes first and second superconductor wires, each wire including a laminate layer, a substrate layer overlaying the laminate layer, a buffer layer overlaying the substrate layer, a superconductor layer overlaying the buffer layer, a gap layer overlaying the superconductor layer, and a laminate layer overlaying the gap layer, a first HTS strap in electrical connection with the second laminate layer of the first laminate wire and the second laminate layer of the second laminate wire, and a backing strap proximate to the first laminate layer.

Two-sided splice for high temperature superconductor laminated wires

High-current, compact, flexible conductors containing high temperature superconducting (HTS) tapes and methods for making the same are described. The HTS tapes are arranged into a stack, a plurality of stacks are arranged to form a superstructure, and the superstructure is twisted about the cable axis to obtain a HTS cable. The HTS cables of the invention can be utilized in numerous applications such as cables employed to generate magnetic fields for degaussing and high current electric power transmission or distribution applications.

High-current, compact flexible conductors containing high temperature superconducting tapes

Processes for the fabrication of MgBpowder and wires are provided. Powders are produced by mechanically alloying magnesium- and boron-containing precursors under controlled conditions to avoid secondary phase and impurity formation. Powders are also prepared by vapor phase reaction of volatile magnesium- and boron-containing precursors. Wires, tapes, films and coatings are provided.

Processing of magnesium-boride superconductors

Enhanced high temperature coated superconductors joined at a cap layer

Enhanced high temperature coated superconductors

An elongated current limiting composite material comprising one or more high-temperature superconductor filaments and a second electrically conductive member, which may include a sheath of high bulk resistivity surrounding the filament. The current limiter exhibits dissipation in the range of 0.05-0.5 V/cm at currents of 3-10 times the operating current, thereby minimizing fault currents and improving recovery capability.

Current limiting composite material

A method is described to prepare a highly textured oxide superconductor article in a single deformation-sinter process. A precursor article including a plurality of filaments comprising a precursor oxide having a dominant amount of a tetragonal BSCCO 2212 phase and a constraining member substantially surrounding each of the filaments is provided. Each of the filaments extends along the length of the article. The oxide article is subjected to a heat treatment at an oxygen partial pressure and temperature selected to convert a tetragonal BSCCO 2212 oxide into an orthorhombic BSCCO 2212 oxide and, thereafter, roll worked in a high reduction draft in a range of about 40% to 95% in thickness so that the filaments have a constraining dimension is substantially equivalent to a longest dimension of the oxide superconductor grains. The rolled article is sintered to obtain a BSCCO 2223 oxide superconductor.

Simplified deformation-sintering process for oxide superconducting articles

A novel process of the production and processing of high quality, high T (Bi,Pb)SCCO superconductors starts with fabrication of a precursor article including selected intermediate phases with desired chemical and structural properties. The precursor fabrication includes mixing raw powders with a desired ratio of Bi:Pb:Sr:Ca:Cu elements and reacting the mixture under different selected reaction conditions that form a precursor powder with a dominant (Bi, Pb)SCCO 2212 phase and without Ca&mdash;Pb&mdash;O phase, wherein the 2212 phase may be the orthorhombic 2212 phase. The precursor article is then subjected to optimized reaction and mechanical deformation processes that lead to a reaction induced texturing and deformation induced texturing, respectively. A heating process is used to convert the precursor powder to the 2223 phase and subsequent deformation and annealing processes may be used to form a substantially single phase, highly textured (Bi, Pb)SCCO 2223 superconductor with high Jc.

Production and processing of (Bi, Pb)SCCO superconductors

Oxide bronze compositions and articles manufactured in accordance therewith are provided. The oxide bronze compositions have the general formula A BO , in which A comprises an alkali, alkaline earth or rare earth metal and in which A has a valence, m, equal to 1, 2 or 3, B comprises a transition metal having a valence, n, less than or equal to 6,0<x<1 on an atomic ratio basis and y&equals;&lsqb;(x)(m)&plus;n&rsqb;/2. High temperature superconducting devices incorporating such compositions are also provided. The superconducting devices include a substrate having a polycrystalline superconducting layer or filament deposited on top of or embedded in the substrate. The superconducting layer or filament is formed of the oxide bronze composition. In some embodiments, the oxide bronze layer is textured with a full-width-half-maximum of a pole figure of less than or equal to 20 degrees.

Oxide bronze compositions and textured articles manufactured in accordance therewith

A method for preparing a BSCCO-2223 oxide superconducting article includes annealing an oxide superconductor article comprised of BSCCO-2223 oxide superconductor at a temperature selected from the range of about 500&deg; C.&lE;T&lE;787&deg; C. and an annealing atmosphere having an oxygen pressure selected from within the region having a lower bound defined by the equation, P (lower)&gE;3.5&times;10 exp(&minus;32,000/T&plus;273) and an upper bound defined by the equation, P (upper)&lE;1.1&times;10 exp(&minus;32,000/T&plus;273). The article is annealed for a time sufficient to provide at least a 10% increase in critical current density as compared to the critical current density of the pre-anneal oxide superconductor article. An oxide superconductor having the formula Bi Pb Sr Ca Cu O , where 0&lE;x&lE;1.5 and where 0&lE;y&lE;0.6 is obtained, the oxide superconductor characterized by a critical transition temperature of greater than 111.0 K, as determined by four point probe method.

Processing of oxide superconductors

An aspected multifilamentary oxide article is provided having a plurality of aspected filaments including a metal oxide and extending continuously for the length of the article. A constraining member substantially surrounds each filament, wherein each of the filaments has an average transverse cross-sectional thickness less than about 35 &mgr;m and an average variation in cross-section along its length of less than about 10%. The article exhibits superior filament uniformity, hardness, and oxide density and texture.

High texture factor

Growing community of inventors

Chelmsford, MA, United States of America

Alexander Otto