47results about How to "Increase the critical current" patented technology

The invention relates to a conductor arrangement (1A) for a resistive switching element, comprising at least a first and at least a second conductor connection (10, 20, 30) disposed in a mutual plane adjacent to each other and insulated against each other. The composite conductors (10, 20, 30) each have two conductor parts (11, 12, 21, 22, 31, 32) extending parallel, and forming a bifilar construction, said conductor parts being constructed from at least one supraconducting conductor band (2). The composite conductors (10, 20, 30) are formed into a coil winding, wherein the windings thereof substantially extend in the manner of a spiral, and are insulated against each other by means of a spacer (3).

Provided are a system and a method for uniformly polishing a surface of a tape-like metal base material in a unit of several hundred meters, at a high speed and a high efficiency. The polishing system for continuously polishing the surface of the tape-like metal base material to be polished is provided with an apparatus for continuously running the tape-like metal base material; an apparatus for applying a prescribed tension to the tape-like metal base material; a first polishing apparatus for performing initial polishing at random to the surface of the tape-like metal base material to be polished; and a second polishing apparatus for performing final polishing to the surface of the tape-like metal base material to be polished, along the running direction. A polishing mark is formed by the final polishing, along the running direction on the surface to be polished.

In order to provide a flexible oxide superconducting cable which is reduced in AC loss, tape-shaped superconducting wires covered with a stabilizing metal are wound on a flexible former. The superconducting wires are preferably laid on the former at a bending strain of not more than 0.2%. In laying on the former, a number of tape-shaped superconducting wires are laid on a core member in a side-by-side manner, to form a first layer. A prescribed number of tape-shaped superconducting wires are laid on top of the first layer in a side-by-side manner, to form a second layer. The former may be made of a metal, plastic, reinforced plastic, polymer, or a composite and provides flexibility to the superconducting wires and the cable formed therewith.

To improve the performance of superconducting cables, a composition method for obtaining a bar-like semifinished product by exclusively cold plastic deformation operations has been devised, and which includes the steps of: forming round-section, mono- or multifilament, superconducting copper bars of relatively long length; assembling the bars about a cylindrical copper core of substantially the same length, using assembly templates which open book-fashion and are fitted to and slide along an assembly bench, the templates having through holes arranged in a circle to support the bars, and a central through seat for supporting the core; tying the bars onto an outer lateral surface of the core; sliding onto one end of the assembly so formed a number of metal supporting rings resting on the assembly bench, while sliding the templates off the opposite end of the assembly; sliding a copper tube onto the assembly so formed, while at the same time cutting the ties in axial sequence and sliding off the supporting rings; and performing a number of drawing operations on the finished assembly to gradually reduce the cross section and increase the length of the assembly to obtain a bar-like semifinished product of the required dimensions, from which, after salt bath heat treatment, a superconducting cable is obtained by cold drawing.

The invention relates to a coated superconductor, in particular to a multi-layer structure for a barium-copper-oxygen high-temperature superconducting coated conductor, and mainly aims at overcoming the defects that an existing second generation superconducting strip has an uneven component structure, serious element diffusion, large surface coarseness, holes, a secondary phase and the like. According to the technical scheme, by the multi-layer structure for the barium-copper-oxygen high-temperature superconducting coated conductor, a lanthanum manganese oxide / magnesium oxide / yttrium oxide / aluminum oxide hastelloy strip is arranged on a bottom layer; a metal-organic deposited rare-earth barium-copper oxide superconductor layer is arranged on a top coating; the metal-organic deposited rare-earth barium-copper oxide superconductor layer is arranged on a middle coating; and the multi-layer structure is characterized in that a metal-organic deposited copper oxide layer is sandwiched between the middle coating and the top coating or between the middle coating and the bottom layer. The multi-layer structure for the barium-copper-oxygen high-temperature superconducting coated conductor is suitable for preparation of a rare-earth barium-copper-oxygen high-temperature superconducting thick film by a chemical method.

The invention discloses a method for manufacturing a REBCO superconducting film and a constant-temperature dip-coating device. The method comprises the following steps: (A) preparing a precursor solution containing rare earth element ions, barium ions, copper ions and a solvent; (b) controlling a coating temperature by a constant temperature way with the temperature not higher than 20 DEG C, controlling a substrate and the precursor solution to be at same set temperatures, and coating the precursor solution on the substrate to obtain a precursor film; and (c), placing the precursor film in a heat treatment furnace and carrying out thermal decomposition, sintering and oxygenation steps to obtain an REBCO superconducting film. According to the invention, the coating temperature is controlled to be at a specific constant value, so that the thickness of the film increases.

The invention discloses an online hot drawing preparation method of a bronze process Nb3Sn superconducting wire. After cold drawing of a bronze process Nb3Sn bar, the bronze process Nb3Sn bar is placed in a vacuum heat treatment furnace for intermediate annealing so as to obtain the bronze process Nb3Sn wire; the bronze process Nb3Sn wire passes through the heated tube furnace; online hot drawingis performed on the bronze process Nb3Sn wire through a drawing die on one side of the tube furnace; and the bronze process Nb3Sn wire is obtained after repeated online hot drawing. Online annealing of the bronze process Nb3Sn superconducting wire is realized, operation is convenient, the annealing time is short, the Nb3Sn phase generated by the pre-reaction is reduced, overall deformation of thewire is uniform and the critical current of the wire is high.

The invention discloses an inductance and resistance composite superconducting reactor, the technical points of which are as follows: mainly including a superconducting inductance coil, a superconducting non-inductive coil, a low-temperature Dewar component, a low-temperature insulating bushing, and a superconducting binary current lead , superconducting transition wires and low-temperature refrigerant pipes; superconducting inductive coils and superconducting non-inductive coils are completely immersed in low-temperature refrigerants in low-temperature Dewar components; low-temperature insulating sleeves, superconducting binary current leads and low-temperature refrigeration The agent pipelines are all connected to the sealing cover of the low-temperature Dewar part; the superconducting inductance coil is connected in series with the superconducting non-inductive coil through the superconducting transition wire, and then connected to the superconducting binary current lead, thus forming a fixed inductance value and The inductance and resistance compound superconducting reactor with variable resistance value takes into account the application characteristics of the fixed inductance value of a single superconducting reactor and the variable resistance value of a single superconducting non-inductive coil, and can have both Power system current limiting and power compensation functions, and high-efficiency neutral point grounding functions.