Superconductor production process

FIELD: electrical engineering including superconductivity; improved technologies for producing semiconductors.

SUBSTANCE: when specimen of desired size is produced from working charge, it is pierced with thin threads, such as silk ones, disposed in parallel with direction of current flow in product so as to raise superconducting junction temperature; during heat treatment these threads burn out to form superconducting passages due to free movement of conducting electrons.

EFFECT: enhanced temperature of superconducting junction.

1 cl

 

The invention relates to the phenomenon of superconductivity and can be used to improve the technology for superconducting materials. A known method of manufacturing a high temperature superconductor (see RF patent №2111570, CL N 01 12/00, 1993). Known high-temperature superconductor contains yttrium or lanthanum, and barium, and additionally silver and selenium at a certain ratio of components. A significant drawback of such a superconductor is the use of components from materials of rare and expensive items.

Also known is a method of obtaining high temperature superconducting products (see RF patent №2091880, CL N 01 12/00, 1995), which are a mixture of powder containing the elements IIA, IIIA, VB, VIB groups of the Periodic system, copper and oxygen, form and thermoablative samples of a given size in oxygen-containing atmosphere by special technology.

This method also has some disadvantages, namely, that the magnitude of the superconducting transition temperature is not high enough; in addition, the value of the superconducting transition temperature is significantly influenced by the degree of dispersion of the source material, the number and structure of the channel conductivity and the size of the sample.

The technical solution proposed and the gain is to increase the superconducting transition temperature.

This object is achieved in that in a method of producing a superconducting wire, based on the formation of a mixture of fine powder containing the elements IIA, IIIA, VB, VIB groups of the Periodic system, copper and oxygen, to form samples of a given size and thermoablative in oxygen-containing atmosphere during the formation of the charge inside it, in the propagation direction of the current in the product evenly placed a thin thread, such as silk, when burnout which after heat treatment are created through the channels of superconductivity with the free movement of conduction electrons.

The novelty of the claimed technical solution is due to conduct additional technological operations when creating a superconducting conductor, ensuring the performance of the grid through the subtlest of holes, which increases the conductivity of the substance.

According to scientific-technical and patent literature authors unknown to the claimed combination of features, aimed at the achievement of the task, and this decision does not follow clearly from the known level of technology of the manufacture of materials of high-temperature superconductors, which allows to make a conclusion about compliance solutions to the invention level.

A method of obtaining a superconducting conductor is sudestada as follows. In the formation of a mixture of fine powder containing the elements IIA, IIIA, VB, VIB groups of the Periodic system, copper and oxygen, powder mix, then when forming cylindrical or square samples placed inside a thin thread, such as silk, in the propagation direction of the current in the product is homogeneously distributed throughout its cross-section. Next, the specimen is heated, and the thread fade and the result is the formation of the through channels of conductivity with the free movement of conduction electrons.

The spacing of the channel conductance determined from the desired value increase of the superconducting transition temperature, which is determined experimentally. Proof of the possibility of improving the superconducting transition temperature is made of a superconductor is the fact that the appearance of even a single end-to-end channel conductivity by electrical breakdown of the dielectric reduces the electric resistance of almost one order of magnitude (see Ginzburg V.L., D.I. E.A., Superconductivity “Pedagogy” 1990, 112 S.). In this regard, the creation of end-to-end channel conductivity in the superconductor will also lead to a decrease in its electrical resistance by about one order of magnitude. The creation of a uniform grid of through holes formed by the method you what orania thin, for example silk, threads, will allow many orders of magnitude to reduce electrical resistance and thus increase the superconducting transition temperature. Changing the number of channels of conductivity, it is possible to regulate the temperature of the superconducting transition of the guide.

The way to obtain a superconducting wire, which comprise a mixture of fine powder containing the elements IIA, IIIA, VB, VIB groups of the Periodic system, copper and oxygen, form and thermoablative in oxygen-containing atmosphere, characterized in that in the preparation of sample of a given size from charge, penetrate her simultaneously located in the propagation direction of the current in the product thin filaments, for example, the silk that the heat treatment of burn out and create end-to-end channels of superconductivity due to the free movement of conduction electrons.



 

Same patents:

The invention relates to the production of superconducting materials and can be used in the electrical industry and other branches of science and technology in the manufacture of superconducting magnetic systems for various applications

The invention relates to techniques and materials with a high conductivity, the methods of their processing
The invention relates to the field of electrical engineering, in particular to a technology for vysokotemperaturnykh superconducting products

The invention relates to electrical engineering and can be used in the production of windings of high field pulsed magnets, as well as for heavy-duty power lines
The invention relates to electrical engineering, in particular to a method for superconductors in the form of composite wide strips and sheets with different number of layers and lived in the layer of high-temperature superconducting (HTS) of compounds designed to create electrical products

The invention relates to the electrical industry, to a method of manufacturing a superconducting wire of finite length, providing at least the input of superconducting material in a metal tube, stacking or folding metal tube with the contact outer surfaces of the various parts of the tube and heating the metal tube, filled with the original superconducting material to a temperature close to the melting point of the metal tube, in order to form the source material of the superconducting phase

The invention relates to the field of electrical engineering and can be used in devices that are primarily designed to operate in magnetic fields above 10 T at high current densities and low hysteresis losses

The invention relates to the production of high-temperature superconductors, in particular the production of high-temperature superconductors of the most common materials available manufacturing technology

The invention relates to the production of high-temperature superconductors, in particular the production of high-temperature superconductors of the most common materials available manufacturing technology

The invention relates to the field of electrical engineering, namely the superconducting wire of circular cross section for alternating currents, and can be used in cryogenic electrical engineering

FIELD: electrical engineering including superconductivity; improved technologies for producing semiconductors.

SUBSTANCE: when specimen of desired size is produced from working charge, it is pierced with thin threads, such as silk ones, disposed in parallel with direction of current flow in product so as to raise superconducting junction temperature; during heat treatment these threads burn out to form superconducting passages due to free movement of conducting electrons.

EFFECT: enhanced temperature of superconducting junction.

1 cl

FIELD: electrical engineering; producing long conductors around superconducting compounds.

SUBSTANCE: proposed method includes formation of single-core billet by filling silver sheath with bismuth ceramic powder; deformation of this single-core billet to desired size by no-heating drawing at deformation degree per pass of 0.5 - 20%; cutting of deformed billet into measured parts; assembly of single-core billet by disposing desired quantity of measured parts of deformed single-core billet in silver sheath of multicore billet; extrusion of multicore billet at temperature ranging between 100 and 200 °C and at drawing coefficient of 4 to 30; air rolling without heating at deformation degree per pass of 1 - 50%; thermomechanical treatment including several heat-treatment stages at temperature of 830 - 860 °C for time sufficient to obtain phase of desired composition and structure in ceramic core with intermediate deformations between heat-treatment stages at deformation degree per pass of 5 - 30 %.

EFFECT: enhanced critical current density due to sequential packing of ceramic core; facilitated manufacture.

1 cl, 1 ex

FIELD: applied superconductivity.

SUBSTANCE: proposed composite superconductor that can be used to manufacture superconductors for superconducting windings suffering heavy mechanical loads (at operating pressure across conductor higher than 100 MPa) as well as for superconducting windings and devices operating under variable conditions, such as superconducting inductive energy storage devices, dipole and quadrupole magnets for charged particle accelerators, has superconducting material fibers, matrix of high-conductivity metal, such as copper and rare-earth intermetallide possessing high thermal capacity at low temperatures. Composite superconductor is provided with metal sheath accommodating rare-earth intermetallide; mentioned wires and conductor are welded together. Metal sheath can be made in the form of hollow cylindrical conductor or flat strip with hollow interlayer, their hollow spaces being designed to dispose rare-earth intermetallide. Composite superconductor is made in the form of a few multiple-fiber composite superconducting wires twisted around hollow cylindrical conductor accommodating rare-earth intermetallide. Composite superconductor can be made in the form of flattened single-lay strand of several multiple-fiber composite superconducting wires and several hollow cylindrical conductors of same diameter accommodating intermetallide which alternately vary within strand. Rectangular-section conductor is made of high-conductivity metal and has longitudinal groove.

EFFECT: enlarged functional capabilities.

7 cl, 8 dwg

FIELD: production of long-measuring composite wires based on high-temperature superconducting compounds.

SUBSTANCE: proposed method includes formation of multiconductor billet by filling silver sheath with bismuth ceramic powder, deformation of multiconductor billet obtained to desired size by drawing without heating at deformation degree per pass ranging between 0.5 and 20%, cutting of deformed billet into metered sections, assembly of multiconductor billet by disposing desired number of metered parts of deformed multiconductor billet in sheath made of reinforced silver based alloy, extrusion of multiconductor billet at temperature ranging between 130 and 280 °C and drawing coefficient of 4 to 30, rolling in the open without heating at deformation ratio per pass between 1 and 50%, and thermomechanical treatment under preset conditions. Sequential compression of ceramic core raises density of critical current.

EFFECT: improved geometry of conductors, enhanced wire mechanical properties and resistance, reduced heat conduction of sheath.

1 cl

FIELD: producing long-measuring composite wires based on high-temperature superconducting compounds.

SUBSTANCE: proposed method includes formation of multiconductor billet by filling silver based reinforced alloy sheath with bismuth ceramic powder, deformation of multiconductor billet obtained to desired size by drawing without heating at deformation degree per pass ranging between 0.5 and 20%, assembly of multiconductor billet by disposing desired number of metered parts of deformed multiconductor billet in mentioned sheath, extrusion of multiconductor billet at temperature of 150 to 300 °C and drawing coefficient of 4 to 30, rolling in the open without heating at deformation degree per pass of 1 to 50%, and thermomechanical treatment under preset conditions. Ceramic core is sequentially compressed to enhance critical current density.

EFFECT: improved conductor geometry, ceramic-to-sheath interface, and ceramic core texture, enhanced wire mechanical properties and sheath resistance, reduced heat conductance of sheath.

1 cl

FIELD: engineering of high voltage isolation system, useable at low temperature.

SUBSTANCE: high voltage isolation system aside from cooling liquid 3 contains solid isolator 2 on basis of cellulose base fabric 20. Solid isolator 2 is utilized primarily in form of pressed sheets and saturated with polymer resin. At 77K it has high field strength with partial discharges, and also its thermal expansion coefficient is optimally matched with thermal expansion coefficient of ceramic high temperature superconductors. Pressed sheets may be deformed in dry state, in particular, as frames for coils, or as an alternative may be composed with cotton fabrics into laminates of arbitrary thickness. Into base fabric or intermediate layer it is possible to add: carbon in form of filaments or fabrics, glass filaments in form of filaments or fabrics. Method for manufacturing system for high voltage insulation of electric conductors includes deforming base fabric in dry state, saturating it with polymer resin and dipping solid isolator into cooling means. Deformed pressed sheet forms a frame of coil, onto which at least one winding of superconductor is wound, then the frame and winding are saturated jointly.

EFFECT: increased efficiency.

2 cl, 3 dwg

FIELD: electrical engineering; devices designed for operation at liquid helium temperature.

SUBSTANCE: proposed method for manufacturing composite wire includes production of primary composite billet incorporating external sheath and axial cylindrical block, sealing of primary composite billet, reduction, and extrusion, followed by deformation to obtain rod of desired shape and size, its cutting into measured lengths, formation of secondary composite billet by assembling rod in external sheath, sealing of secondary composite billet, reduction, and extrusion, followed by deformation to final size of wire; composite billet reduction involves its pre-extrusion press-fitting in container; total cross-sectional area of composite billet components is 95-99% of that of inner space of container sleeve and inlet part of composite billet external sheath is made in the form of transition zone having cylindrical part whose outer diameter is smaller than that of container sleeve and conical part, volume of voids within composite billet amounting to 1-17% of that of external sheath inner space.

EFFECT: provision for pre-extrusion hot compression of composite billet without additional time requirement.

6 cl, 2 dwg

FIELD: electrical engineering; production of magnesium diboride based high-temperature superconductors.

SUBSTANCE: proposed method for producing single-core and multicore superconductors for critical current density includes production of hollow metal ampoule, its filling with powder in the form of mixture of stoichiometric composition incorporating homogeneous granulated magnesium having clean passivated surface obtained by centrifugal spraying of magnesium heated to 650-850 °C from crucible revolving at speed of 1000-6000 rpm, as well as crystallization of sprayed magnesium in helium environment and amorphous boron powder, deformation of ampoule-powder element by extrusion at temperature of 450-500 °C and extrusion coefficient of 3-6, followed by drawing with deformation degree of 5-10% per pass, and heat treatment at 800-900 °C for 1-10 in vacuum or argon environment.

EFFECT: improved quality of superconductor core due to higher quality of magnesium powder and especially improved condition of magnesium powder surface.

5 cl

FIELD: electrochemistry.

SUBSTANCE: proposed method involves filling of cylindrical bag with auxiliary parts which are then removed from bag and replaced by bar assemblies placed in definite sequence affording maximal filling density; sectional area of each auxiliary member differs from that of its substituting bar; central regular-hexagon shaped auxiliary member has face width A1 found from expression where a is hexagonal bar width, M is number of bars in diametric direction; second row around central member is alternately filled with auxiliary members of which three ones are regular-hexagon shaped members having face width A2 found from expression and three other hexagon-shaped auxiliary members have face width found from set of expressions all next rows are alternately filled with auxiliary hexagon-shaped members whose face width is found from set of expressions and remaining free space between hexagon-shaped auxiliary members, as well as cylindrical bags are filled with additional auxiliary members whose cross-sectional area provides for maximal filling of bags.

EFFECT: facilitated procedure, ability of filling billet with thousands of bars during its single assembly process.

3 cl, 7 dwg

FIELD: electrical engineering.

SUBSTANCE: proposed superconducting device has superconducting oxide wire made of superconducting oxide material whose post-sintering density is 93% and more, best 95% and more, or most preferably 99% or more, which is attained by heat treatment of wire in enhanced pressure environment of at least 1 MPa and below 50 MPa. Heat treatment of wire at enhanced pressure prevents formation of gaps and bubbles. Stable superconducting oxide phase of Bi2223 is formed in the process.

EFFECT: enhanced critical current density of superconducting device and superconducting cable.

6 cl, 27 dwg, 4 tbl, 6 ex

Up!