Abstract: In a fabrication method of a MgB2 superconducting tape and wire by filling a tube with a MgB2 superconducting powder and forming it into a tape or wire, a fabrication method of a MgB2 superconducting tape (and wire) which is characterized by using a MgB2 superconducting powder having a high critical current density (Jc) owing to its lowered crystallinity and having potential for excellent grain connectivity as the MgB2 superconducting powder. Provided are a fabrication method of a MgB2 superconducting tape and wire which can fabricate a MgB2 superconducting tape and wire having a level of Jc sufficiently high for practical applications and homogeneous quality throughout its length by an ex-situ process employing a material of the composition suitable for its working environment as the sheath material, and a MgB2 superconducting tape and wire thereby fabricated.

Abstract: Provided is a superconducting apparatus, including a joint of superconducting wires having high electric conduction characteristics and a superconducting magnet or the like. The superconducting joint comprises a plurality of superconducting wires and a sinter which integrates the plurality of superconducting wires. Herein, at least any one of the superconducting wires is a MgB2 superconducting wire, the sinter contains MgB2, and the sinter is compressed form the direction different from the direction toward which the superconducting wires protrude. Further, in order to form such a joint, a compression vessel provided with an opening used for introducing raw material powders to construct the sinter and another opening used for inserting the superconducting wires is utilized, and the openings are directed to different directions each other. Accordingly, MgB2 is filled in the sinter at high density, allowing the joint structure to have a good bonding property among particles.

Abstract: Disclosed herein is a method of preparing a MgB2 superconducting wire and the MgB2 superconducting wire prepared thereby. The method comprising rolling a raw powder by using a powder rolling method. According to the method of the present invention has an effect of increasing an effective area where superconducting current can flow by improvement of the connectivity of a MgB2 superconducting powder and achievement of high density through a powder rolling process, and maintaining an uniform current value even in a large length because of the improvement of the connectivity.

Abstract: An oxide superconductor member is composed of a tape-shaped substrate, an intermediate layer formed on this substrate and an oxide superconductor thin film layer formed on this intermediate layer. A surface of the tape-shaped substrate is polished by continuously running the tape-shaped substrate. The polishing step includes initial polishing process and finishing process which are carried out such that the average surface roughness Ra of the substrate becomes 2 nanometers or less and the in-plane directionality of the intermediate layer becomes 5° or less after the polishing step.

Abstract: An oxide superconductor member is composed of a tape-shaped substrate, an intermediate layer formed on this substrate and an oxide superconductor thin film layer formed on this intermediate layer. A surface of the tape-shaped substrate is polished by continuously running the tape-shaped substrate. The polishing step includes initial polishing process and finishing process which are carried out such that the average surface roughness Ra of the substrate becomes 2 nanometers or less and the in-plane directionality of the intermediate layer becomes 5° or less after the polishing step.

Abstract: A superconducting article includes first and second stacked conductor segments. The first stacked conductor segment includes first and second superconductive segments and has a nominal thickness tn1. The second stacked conductor segment includes third and forth superconductive segments and has a nominal thickness tn2. The superconducting article further includes a joint region comprising a first splice connecting the first and third superconductive segments together and a second splice connecting the second and forth superconductive segments together. The first splice is adjacent to and bridged portions of the first and third superconductive segments along at least a portion of the joint region, and the second splice is adjacent to and bridged portions of the second and forth superconductive segments along at least a portion of the joint region. The joint region has a thickness tjr, wherein tjr is not greater than at least one of 1.8 tn1 and 1.8 tn2.

Abstract: A method of managing thermal contraction of a superconductor cable (2) having a cable body surrounded by an external screen (2A) made form wound metal elements and installed between its ends in an enclosure (1) or cryostat filled with a cryogenic liquid, where the method includes mechanically applying a locking force loading only said screen (2A) at a so-called locking point (5A, 5B) in the vicinity of the ends of the cable.

Abstract: A method for forming a superconducting wire with a tape substrate comprises dispensing the tape substrate, providing at least one reactor chamber to form at least one buffer material on the tape substrate based on determining at least one of a type of tape substrate, a type of superconductor material, and a type of buffer material, providing another reactor chamber to continuously form a layer of the superconductor material on a layer of the buffer material, and spooling the tape substrate with the layer of superconductor material.

Abstract: [Problem] A metal laminated substrate for an oxide superconducting wire is provided at a low cost. The metal laminated substrate has high strength, and stable high biaxial orientation in the longitudinal direction. [Means for Resolution] A metal laminated substrate for an oxide superconducting wire is manufactured such that a non-magnetic metal plate T1 having a thickness of not more than 0.2 mm and a metal foil T2 made of Cu alloy which is formed by cold rolling at a draft of not less than 90% and has a thickness of not more than 50 ?m is laminated to each other by room-temperature surface active bonding, after lamination, crystal of the metal foil is oriented by heat treatment at a temperature of not less than 150° C. and not more than 1000° C. and, thereafter, an epitaxial growth film T3 made of Ni or an Ni alloy having a thickness of not more than 10 ?m is laminated to the metal foil.

Abstract: A method for fabricating a wire from textured powder includes compressing a powder comprising a plurality of particles into a ribbon. The method further includes encasing the ribbon between two foil sheets to create a sheet of encased ribbon. The method additionally includes rolling the encased ribbon into a substantially cylindrical undrawn wire. The method further includes drawing the undrawn wire to create a substantially cylindrical wire having a diameter less than a diameter of the substantially cylindrical undrawn wire.

Abstract: A method of fabricating a superconducting coil is provided which includes fabricating individual coil windings by depositing, shaping and texturing superconductive material in situ on a former which has a substantially curved surface.

Abstract: Disclosed herein is a method of manufacturing round wire using superconducting tape, including the steps of: slitting superconducting tape into superconducting tape strips; silver-coating the slit superconducting tape strips; laminating the silver-coated superconducting tape strips to form a superconducting tape laminate having a square cross-section; holding the superconducting tape laminate; heat-treating the fixed superconducting tape laminate to cause diffusion junction between silver; and copper-plating the heat-treated superconducting tape laminate to have a circular section.

Abstract: Novel articles and methods to fabricate same with self-assembled nanodots and/or nanorods of a single or multicomponent material within another single or multicomponent material for use in electrical, electronic, magnetic, electromagnetic, superconducting and electrooptical devices is disclosed. Self-assembled nanodots and/or nanorods are ordered arrays wherein ordering occurs due to strain minimization during growth of the materials. A simple method to accomplish this when depositing in-situ films is also disclosed. Device applications of resulting materials are in areas of superconductivity, photovoltaics, ferroelectrics, magnetoresistance, high density storage, solid state lighting, non-volatile memory, photoluminescence, thermoelectrics and in quantum dot lasers.

Abstract: A method of producing a Nb3Sn superconducting wire rod includes forming a wire rod comprising Nb, Sn and Cu, and having a mole ratio of the Sn expressed as ax+b(1?x), where 0.25?x?0.8, 0.3?a?0.4 and 0.02?b?0.1, and x and 1?x are prescribed as a mole ratio of the Nb and a mole ratio of the Cu, respectively, to a total of a mole number of the Nb and a mole number of the Cu, and heating the wire rod to produce Nb3Sn from the Sn and the Nb. By the heating of the wire rod, a Cu—Sn alloy is produced from the Sn and the Cu, concurrently with the Nb3Sn produced from the Sn and the Nb.

Abstract: An RE123-based oxide superconductor characterized by comprising a conductive layer containing an REBa2Cu3O7-?-based oxide superconductor formed using a mixed material of at least RE2BaO4 and a Bax—Cuy—Oz-based material and a holding member which holds said conductive layer, where, RE is one type or more of elements selected from La, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu, and Y.

Abstract: The invention relates to a method for producing a high temperature superconductor (HTSC) from a strip including an upper side precursor layer and which, for continuous sintering of the precursor layer within a furnace in the presence of a fed-in reaction gas, is drawn across a support. A furnace for performing the method is also described.

Abstract: A hollow tube (1), for inserting superconductor precursor material such as superconductor precursor rods (13) into its bore (3), wherein the tube (1) extends along an axial direction, and wherein the tube (1) comprises a matrix (4) made of a first ductile material, is characterized in that a plurality of continuous filaments (5), extending along the axial direction of the tube (1), are distributed in the matrix (4), wherein the continuous filaments (5) are made of a second ductile material. With the invention, a good quality mechanical reinforcement of superconductor wires, in particular which can be used without later hot extrusion, can be achieved.

Abstract: Superconductor wires or layers having improved properties and methods for making the same are described. The superconducting layer includes a rare earth element-alkaline earth element-transition metal oxide having an average stacking fault density that is greater than about 0.01 nm?1, wherein two or more rare earth cations form the rare earth element. To form the superconductor layer of the present invention, a layer having a rare earth element-alkaline earth element-transition metal oxide substantially in a first crystal structure can be provided to a substrate where two or more rare earth cations form the rare earth element. The layer can then be heated at a temperature that is greater than 550° C. under oxidizing conditions to form a high-temperature superconducting layer substantially in a second crystal structure.

Abstract: Under one aspect, a method of making a superconductor wire includes providing an oxide superconductor layer overlaying a substrate; forming a substantially continuous barrier layer over the oxide superconductor layer, the barrier layer including metal; depositing a layer of metal particles over the barrier layer, said depositing including applying a liquid including metal particles over the barrier layer; and sintering the layer of metal particles to form a substantially continuous metal layer over the barrier layer. In one or more embodiments, the oxide superconductor layer is oxygen-deficient, and the method may include oxidizing the oxygen-deficient oxide superconductor layer. At least a portion of the sintering and the oxidizing may occur simultaneously, for example by performing them at an oxygen partial pressure and a temperature sufficient to both sinter the metal particles and to oxidize the oxygen-deficient oxide superconductor layer.

Abstract: A superconducting circuit including a superconducting joint that joints a niobium titanium superconducting wire having a structure where a filament made of niobium titanium alloy is arranged in a matrix made of copper or copper alloy and other superconducting wire, in which a volume ratio or a surface density of an ?-Ti precipitation in the niobium titanium alloy of the filament in the superconducting joint is smaller than the volume ratio or the surface density of the ?-Ti precipitation in the niobium titanium alloy of the filament in the niobium titanium superconducting wire in a portion other than the superconducting joint.

Abstract: For producing the superconducting material MgB2, a shapeable master alloy containing Mg and B, as well as at least one additional constituent, an LiMgB alloy is.1 The process permits the production of shaped elements of MgB2, for example by forging, casting, drawing, etc.

Abstract: The present invention is directed to a lamination method. The lamination method includes making the interior of a process chamber a vacuum, the process chamber including a first and a second metal sheet, supplying the first and the second metal sheets, injecting a bonding material between the first and the second metal sheets supplied, bonding the first and the second metal sheets with each other, and heating the bonded metal sheets. The first metal sheet is a superconductive tape, and the second metal sheet is stabilization metal tape.

Abstract: A superconducting cable enables the cooling of the superconducting conductor with high efficiency and has a sufficient insulating strength. A method of controlling the temperature of the coolants used in the cable is offered. The superconducting cable comprises a heat-insulated pipe that houses a cable core provided with a superconducting conductor made of a superconducting material. The cable core is also provided with a poorly heat-conductive pipe placed at the outer side of the outer circumference of the superconducting conductor. The inside and outside of the poorly heat-conductive pipe are separately filled with different types of coolants having different purposes. The poorly heat-conductive pipe is filled with a conductor-use coolant for cooling the superconducting conductor so as to maintain it at the superconducting state. The heat-insulated pipe is filled with an insulation-use coolant for performing electric insulation of the superconducting conductor.

Abstract: A thick film superconductor includes a substrate and a superconducting thick film formed on the substrate. The thick film is 1-20 microns thick with an average twin spacing to film thickness ratio of about 0.016, and is formed from an aqueous solution of YBC ions doped with a particulate rare earth oxide having a diameter of about 50-500 nm. The coated substrate is heat treated, preferably above 650 degrees C. and cooled at a rate less than 15 degrees C. per hour, resulting in a substantially fully oxygenated YBCO layer.

Abstract: A target surface of a tape-shaped substrate of an oxide superconductor with an intermediate layer formed on this target surface and an oxide superconductor thin film is polished by causing the tape-shaped substrate to continuously run. The polishing step includes an initial polishing process for carrying out random polishing of the target surface and a finishing process that is carried out after the initial polishing process for forming grooves on the target surface along the running direction of the substrate. The intermediate layer has an in-plane directionality of 7° or less. The tape-shaped substrate is fabricated by rolling nickel, a nickel alloys or stainless steel.

Abstract: Disclosed is a three layer process for making contact points to a high transition temperature superconductor (HTSC), particularly to (Bi,Pb)2Sr2Ca2Cu3O19+x with and without silver in the superconductor. The contact structure is a three layer configuration with a perforated silver foil (3) sandwiched between two metal spray gun deposited silver layers (2,5) and subsequent heat treatment in air. The contact has been made on tubes and rods (1). The silver contacts are capable of carrying a continuous current of 200 Amps without adding any substantial heat load to the cryogen used to cool the HTSC. The contact resistance at 4.2 K is in the range of 1.5×10 (hoch?8) to 8.5? 10 (hoch?8)OHM in zero applied filed.

Abstract: A method for connecting two or more superconducting wires (1, 2), each comprising at least one filament (3a-3b) that contains MgB2, wherein the superconducting connection is realized through exposed end regions (13) of the filaments (3a-3d) via a superconducting matrix, is characterized in that a bulk powder (4) of a high-temperature superconductor (HTS) powder with a transition temperature of Tc>40K is provided, into which the exposed end regions (13) of the filaments (3a-3d) project, wherein the Boron of the Boron powder of the bulk powder (4) is in amorphous modification, and the bulk powder (4) is compacted together with the projecting exposed end regions (13) of the filaments (3a-3d) to form a compressed element (8). The method improves the quality, in particular, the current carrying capacity and the critical magnetic field strength of a superconducting connection of two MgB2 wires.

Abstract: A polishing system and a method are presented for uniformly polishing efficiently at a fast rate the surface of a tape-like metallic base material of several hundred meters in length. The polishing system is provided not only with devices for causing the base material to travel continuously and applying a specified tension in the base material but also with a first polishing device for randomly polishing the target surface and a second polishing device for carrying out a final polishing on the target surface in the direction of travel of the base material. Polishing marks are formed in the direction of travel on the target surface by the final polishing.

Abstract: The present invention provides a method for producing a MgB2 superconductor, comprising compacting and heating a mixture comprising Mg or MgH2 powder and B powder, wherein said mixture comprises SiC powder and an aromatic hydrocarbon, and a MgB2 superconductor having a higher critical current density (Jc) than that of the known MgB2 superconductors added SiC only or added an aromatic hydrocarbon only such as benzene.

Abstract: A superconducting article is provided which includes a superconducting tape assembly. The superconducting tape assembly includes a superconducting tape layer, having one or more superconducting tapes, and a high-permeability magnetic material layer coupled to the superconducting tape layer. The high-permeability magnetic material layer includes a high-permeability magnetic material which remains magnetically soft at a critical temperature Tc of the superconducting tape, and with presence of an ac magnetic field acting on the superconducting tape assembly, re-magnetizes to divert at least a portion of a normal component of the ac magnetic field therethrough, which reduces ac loss in the superconducting tape layer by modifying the ac magnetic field distribution within the superconducting tape of the superconducting tape layer.

Abstract: An AC-tolerant high temperature superconductor tape with transposed filaments having two layers of high temperature superconducting material with striations and corresponding filaments and an insulating layer positioned therebetween.

Abstract: By adding an aromatic hydrocarbon such as benzene to the powder mixture of magnesium (Mg) or magnesium hydride (MgH2) and boron (B) as raw materials of a superconductor MgB2, high superconducting critical current density (Jc) is obtained.

Abstract: A process and composition of matter are provided and involve flux pinning in thin films of high temperature superconductive oxides such as YBCO by inclusion of particles including barium and a group 4 or group 5 metal, such as zirconium, in the thin film.

Abstract: The formation of band-shaped HTSL on a metal substrate is disclosed. The HTSL includes at least one buffer layer comprising zirconates and/or rare-earth oxides. The HTSL layer is formed on the buffer layer. The buffer layer has a texturing that in the case of a RHEED measurement results in discrete reflexes and not only in diffraction rings. In particular, the buffer layer may be textured along its interface with the HTSL layer.

Abstract: Methods for depositing, at a very high deposition rate, a biaxially-textured film on a continuously moving metal tape substrate are disclosed. These methods comprise: depositing a film on the substrate with a deposition flux having an oblique incident angle of about 5° to about 80° from the substrate normal, while simultaneously bombarding the deposited film using an ion beam at an ion beam incident angle arranged along either a best ion texture direction of the film or along a second best ion texture direction of the film, thereby forming the biaxially-textured film, wherein a deposition flux incident plane is arranged parallel to a direction along which the biaxially-textured film has a fast in-plane growth rate. Superconducting articles comprising a substrate, a biaxially-textured film deposited on said substrate by said methods above; and a superconducting layer disposed on the biaxially-textured film are also disclosed.

Abstract: A low AC loss electrical conductor includes an electrically conductive core surrounded by a first layer of superconductor filaments. A resistive shell surrounds the first layer and an insulation coating radially encloses the resistive shell.

Abstract: A method of synthesizing a superconducting material, comprising mixing starting materials comprising magnesium, boron, silicon and carbon; heating the mixture of starting materials to a temperature in the range between 650° C. and 2000° C. to produce a material comprising magnesium boride doped with silicon carbide; and cooling the resulting material to a temperature below the critical temperature of the material to render the material capable of superconducting.

Abstract: A magnesium diboride superconducting wire has excellent conduction property and stability. The superconductive connection of the magnesium diboride superconducting wire covered with a superconducting coating layer and a same or different kind of another superconducting wire are connected in a metal tube filled with a solder by way of the superconductive coating layer.

Abstract: An Nb3Sn wire rod having a high Jc value is manufactured using an Ag—Sn alloy. A composite rod including a plurality of Nb core materials incorporated in an Ag—Sn alloy matrix material having an Sn concentration of 9.35 to 22.85 at % is prepared. Next, the composite rod is extruded and/or wire drawn while carrying out process annealing of 350 to 490° C., followed by heat treatment at 500 to 900° C. to produce an Nb3Sn filament. Thus, an Nb3Sn extrafine multi-core superconducting wire is manufactured.

Abstract: A method of making a laminated superconductor wire includes providing an assembly, where the assembly includes a substrate; a superconductor layer overlaying a surface of the substrate, the superconductor layer having a defined pattern; and a cap layer; and slitting the assembly in accordance with the defined pattern of the superconductor layer to form a sealed wire. Slitting the assembly in accordance with the defined pattern may form multiple sealed wires, and the substrate may be substantially wider than the sealed wires.

Abstract: The present invention is directed to a lamination method. The lamination method includes making the interior of a process chamber a vacuum, the process chamber including a first and a second metal sheet, supplying the first and the second metal sheets, injecting a bonding material between the first and the second metal sheets supplied, bonding the first and the second metal sheets with each other, and heating the bonded metal sheets. The first metal sheet is a superconductive tape, and the second metal sheet is stabilization metal tape.

Abstract: A sintered high temperature superconducting (HTS) ceramic electric lead formed as three-dimensional (3D) HTS macro-ceramic solid product with honeycomb-like superconductive nano-architecture comprises substantially uniformly aligned nano-size HTS ceramic crystal grains, silicate glass nano-thick films, and nano-size silver and/or inorganic dots that locate in nano-thick boundary areas of the superconductor ceramic crystal grains, and the nano-size films or dots provide honeycomb-like 3D nano-size network within the 3D HTS macro-ceramic solid product or HTS ceramic lead, and the electric lead is superconducting at liquid nitrogen cooling temperature. The superconductive nano-architecture facilitates or controls substantially higher electro-magnetic and consumable mechanical properties, reliability and durability of the HTS ceramic electric leads.

Abstract: The present invention concerns the improvement of the supercurrent carrying capabilities, i.e. the increase of critical current densities, of polycrystalline superconductor structures, especially of high-Tcsuperconductors. By modifying the microstructure of the substrate or by appropriately influencing the buffer layers in coated conductors to obtain grains with large aspect ratios which are predominantly oriented along the direction of the current flow, grain boundaries with large areas are obtained in the polycrystalline superconducting film that can support large critical currents along the superconductor. Thereby large critical currents are obtained in the superconductor for a given spread of misorientation angles of the grains.

Abstract: A system for transmitting current is described. The system includes at least one generator, at least one cryostat, and at least one load. The system may further include one of terminations, a refrigeration system, and terminations and a refrigeration system. The cryostat has at least one electrical phase including at least one mandrel and magnetically decoupled superconducting conductors that may accomplished by, for example, braiding the superconductor.

Abstract: A superconducting coil comprises a plurality of windings. Each winding comprises at least one superconducting segment having an exposed area containing a granular superconducting substance. A junction electrically connects at least one superconducting segment of one winding to at least one superconducting segment of another winding. The junction is formed by coupling the granular superconducting substance of the exposed area of the at least one superconducting segment of the one winding to the granular superconducting substance of the exposed area of the at least one superconducting segment of the other winding. In an embodiment, the exposed areas are positioned to face each other.

Abstract: A method of manufacturing a superconducting wire includes the step of drawing a wire formed by coating raw material powder for a superconductor with a metal, the step of first rolling rolling a multifilamentary wire after the step of drawing, and the step of first sintering sintering the multifilamentary wire after the step of the first rolling. The method further includes the step of holding a clad wire, a multifilamentary wire, or a multifilamentary wire under a reduced-pressure atmosphere in at least one of an interval between the step of drawing and the step of the first rolling and an interval between the step of the first rolling and the step of the first sintering.

Abstract: The invention offers a method of producing a Bi-2223-based superconducting wire. The method has a preparing step for preparing a precursor 11 that is a powder and that is formed of a main phase, composed of a Bi-2212 phase, and the remainder, composed of a Bi-2223 phase and a nonsuperconducting phase, a filling step for filling the precursor into a metallic tube at a pressure of at most 1,000 Pa, and a sealing step for sealing the metallic tube filled, at a pressure of at most 1,000 Pa, with the precursor. The method decreases the intrusion of impurity gases and thereby increases the critical-current value.

Abstract: A biaxially textured article includes a substrate, a first buffer layer disposed on the substrate, the first buffer layer having uniaxial crystal texture characterized by out-of-plane texture with no significant in-plane crystallographic texture. A metal comprising second buffer layer is disposed on the first buffer layer, the second buffer layer having a biaxially textured surface. An electronically active layer, such as a superconductor layer, can be disposed on the second buffer film. Ion-beam assisted processes can be used to biaxially texture the surface of the second buffer film after its deposition.

Abstract: A superconductor coating inclusive, tape-like electrical conductor and windings using such conductor for magnets and electrical machines, etc. The described windings are suited for inclusion of successor superconductor materials such as yttrium barium copper oxide wherein magnetic flux related losses can potentially be excessive and preclude successful machine operation. Winding orientation and configuration of the conductor in an alternating current machine for lower losses are disclosed along with methods and apparatus for achieving the desired windings. Windings intended for differing locations within a machine of this type are made possible by the invention. Equations relating to magnetic losses incurred in such windings are also disclosed.

Abstract: A method for fabrication of nanometer scale metal fibers, followed by optional further processing into cables, yarns and textiles composed of the primary nanofibers. A multicomponent composite is first formed by drilling a billet of matrix metal, and inserting rods of the metal desired as nanofibers. Hexed or round rods can also be inserted into a matrix metal can. The diameter of this composite is then reduced by mechanical deformation methods. This composite is then cut to shorter lengths and reinserted into another billet of matrix metal, and again the diameter is reduced by mechanical deformation. This process of large scale metal stacking followed by mechanical deformation is repeated until the desired fiber size scale is reached, the fibers being contained in the matrix metal. After size reduction, the composite metal wires may be further processed into built up configurations, depending on intended application, by stranding, cabling, braiding, weaving, knitting, felting, etc.