Method for producing long-measuring composite wire based on high-temperature superconducting compounds

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

 

The invention relates to the technical field of superconductivity, in particular to a technology for long composite stranded wire-based high-temperature superconducting (HTS) of compounds designed to create electrical products.

It is known that the stranded wire-based HTSC compounds produced by the method of "powder-in-tube, including the filling of ceramic powder in a metal sheath, the deformation obtained monolignol billet to the desired size, cut-to-length parts, the Assembly of the multi-core preform by placing in a metal shell of the required quantity of these dimensional parts, the deformation of the multi-strand billet and heat treated in several stages with intermediate strain between them (thermomechanical processing) [1]. In the case of filling a metal sheath, for example, ceramic powders deformation is carried out to obtain the desired wire size and maximum possible compaction of the core before thermomechanical treatment (TMT), which is carried out with the aim of forming a ceramic core superconducting phase of the desired composition and structure. When using ceramic powders deformation is performed by drawing and rolling, which do not allow to achieve the required density ceramic watch is Russian to the core.

Also known methods for producing wire-based HTSC compounds by the method of "powder in tube" on the basis of metal powders, however, when using metal powders to obtain a wire with a critical current density higher than 500 A/cm2difficult [2].

Closest to the proposed technical solution is the method of getting stranded conductor [3] is a prototype, including the production of monolignol blanks by filling metal powder in a silver sheath, the extrusion obtained monolignol billet to the required size at a temperature of from 300 to 600°and the magnitude of the coefficient hoods up to 800, cutting the deformed billet-to-length parts, the Assembly of the multi-core preform by placing in a silver sheath stranded procurement quantity required dimensional parts deformed monolignol billet, extrusion of multi-strand billet at a temperature of from 300 to 600°and the magnitude of the coefficient hoods up to 800, rolling at a temperature of from 300 to 600°in a controlled atmosphere (argon), oxidation, thermo-mechanical processing.

In the deformation process extrusion is possible with the currently used main methods of deformation (drawing, rolling, extrusion) sealing the core of mono - and multi-core billet, one is about in the case of metal powders after deformation spend oxidation (translated metals in oxides), in which there is a softening of the core, and TMO (superconducting phase of the desired composition and structure form already in ceramic consisting of oxides, core).

It should be noted that when TMO should be possible, the smooth surface of the partition powder - shell, which is one of the most important conditions texturing grains of the superconducting phase in the predominant direction of current flow.

This method has a number of disadvantages:

the use of metal powders requires before TMO operations oxidation of these powders, and this greatly complicates the process introduces an additional operation in a controlled atmosphere - oxidation of core by oxygen diffusing through the Explorer shell, which results in the softening of hearts); moreover, it is difficult to obtain in the core of stoichiometric superconducting compound, and if TMO is more difficult to obtain the desired structure of the core, which leads to a significant reduction of the critical current density;

- modes extrusion, selected in the prototype, can be used only in case of use of metal powders, in addition, carrying out the extrusion at high temperature (300 to 600° (C) with large coefficients with the LCD up to 800 complicates the process; extrusion can be carried out in vertical and horizontal arrangement of the workpiece and the wire, in both cases, when the extrusion billets of large diameter with high elongation ratio is necessary to provide the snap-in to receive wires with high velocities, which are determined by the speeds of forging equipment,

- conducting warm rolling at a high temperature (300 to 600° (C) in a controlled atmosphere (argon) also complicates the process and reduces its security,

- use silver shell monolignol and multi-strand billet does not allow to achieve the required quality of the boundary between the ceramic core - silver, to increase the mechanical properties of the wires and the electrical resistance of the membrane, which reduces the critical current density. All this reduces the use of wires.

An object of the invention is to increase the critical current density due to sequential (from operation to operation) seal ceramic core, improve geometry lived, improve boundary ceramic - shell, textures, ceramic core, the enhancement of the mechanical properties of the wire and the electrical resistance of the membrane, the lower thermal conductivity of the shell and simplification of the way.

The problem is solved in that in the method prototype, including the filling of powder into the metal shell monolignol workpiece deformation obtained monolignol billet to the desired size, cut, deformed billet-to-length parts, the Assembly of the multi-core preform by placing the desired number of measuring parts deformed monolignol workpiece in a metal sheath multi-core billet, extrusion, rolling and TMO, features: shell monolignol blanks are made of hardened alloy based on silver, in her sleep powder bismuth ceramics deform Manoilo the workpiece by drawing at room temperature, i.e. without heating, with the degree of deformation per pass of 0.5 up to 20%, collect stranded the workpiece by placing the measuring parts deformed monolignol blanks in the shell stranded blanks, which are made of hardened alloy based on silver, extrusion of multi-strand billet is carried out at a temperature of from 150 to 300°and with the size of the drawing ratio of from 4 to 30, the rolling is carried out at room temperature in air with a degree of deformation per pass from 1 to 50%, followed by thermomechanical processing, which includes several stages of heat treatment at a temperature of from 810 to 840°during BP is like, providing the formation in the ceramic core superconducting phase of the desired composition and structure, with the intermediate deformations between stages of heat treatment on the degree of deformation per pass from 5 to 30%.

During the above operations is consistent seal stranded long wires, improves the geometry of the veins, improves the interface of ceramic - shell, improves the texture of the ceramic core, which ensures an increase of the critical current. The obtained wire also has improved mechanical properties and increased resistance of the shell.

Filling a ceramic powder in a shell of hardened alloy based on silver, it is possible to get at the core of the wire close to the superconducting chemical composition of the material already at the initial stage of obtaining wire. And during subsequent deformation (drawing, extrusion, rolling and TMO gradual compaction of the ceramic core. In the case of metal powders necessary to perform an operation of oxidation with in order to obtain the core wire material close to the superconducting chemical composition, thus there is a significant softening of the core (obvious with the passage of oxygen into the core through the shell p is the gadfly of a thickness of from 0.4 to 0.5 mm). After oxidation seal already ceramic core occurs only when TMO, which includes, as a rule, only a few (2-3 and up to a maximum of 4) intermediate deformations, which is insufficient for the required sealing of the ceramic core, and increasing the number of intermediate deformations at TMO is impractical due to disruption of the structure, the texture of the ceramic core and the geometry of the wire. This is one of the main reasons small critical currents of the wires on the basis of metal powders.

Use as a sheath material monolignol billet hardened alloys based on silver, it is possible to achieve smoother (than using a silver sheath) of the boundary between the core and the shell, which positively affects the growth of the superconducting phase at TMO and leads to the final stage to increase the critical current. In addition, the presence of the reinforced shell allows you to increase the mechanical properties of the wires and the electrical resistance of a shell in order to prevent the passage of current, leading to local overheating of the conductor and out of the superconducting state), as well as to reduce the conductivity of the membrane in order to reduce heat gain to the zone helium temperatures (4.2 K) when using HTS materials as the current lead is in, working in the temperature gradient between 4.2 and 77 K.

The deformation obtained in the previous step monolignol blank by drawing at room temperature with the degree of deformation per pass from 0.5 to 20% provides reception moneilema wire densified ceramic core of the desired shape and size, which greatly simplifies the process, making it more stable (no significant temperature gradient) and safe.

Use as the shell of a multi-strand billet hardened alloy based on silver also provides increased mechanical properties of the wires and the electrical resistance of the membrane (in order to prevent leakage of current, leading to local overheating of the conductor and out of the superconducting state) and, in addition, reduces the conductivity of the membrane in order to reduce heat gain to the zone helium temperatures (4.2 K) when using HTS materials as current leads, operating in the temperature gradient between 4.2 and 77 K.

The deformation of the multi-billet extrusion at a temperature of from 150 to 300°and the magnitude of the coefficient extraction from 4 to 30 simplifies the process, making it stable (significantly decreases the temperature gradient), safe and provides a multi-strand long wire with ceramic series is cevenol, similar in chemical composition to the superconducting material of the desired shape and size. In addition, when the deformation of multi-billet extrusion also there is a further compaction of the ceramic core. Thus, carrying out the extrusion at a temperature of from 150 to 300°provides for receiving wire from a multi-strand billet in the shell of hardened alloy based on silver, collected from manoil in the shell of hardened alloy based on silver.

When reducing the size of the drawing ratio from 800 to 4-30 sharply reduced the likelihood of the geometry lived, which is beneficial later on the increase of the critical current.

Rolling without heating, in air, and when the degree of deformation during the passage from 1 to 50% provides the receive wire of the desired size and shape, for example flat, mainly in thickness, with the required geometry of the core and greatly simplifies the process compared to rolling at a temperature of from 300 to 600°in a controlled atmosphere. In addition, when rolling is further seal the core.

TMO, including several stages of heat treatment at a temperature of from 810 to 840°With intermediate strain between them with a degree of deformation per pass from 5 to 30%, provides a further seal the core and forming with erprobte phase of the desired composition and structure, which allows to obtain a superconducting wire with high current-carrying characteristics.

When deformation monolignol workpiece drawing with the degree of deformation per pass less than 0.5% is a violation of the geometric dimensions of the wire, you receive the wave-like along the length of the wire, and when drawn with a degree of deformation per pass more than 20% is a violation of the integrity of the shell, which is manifested in the formation of small cracks and their growth until the complete destruction of the membrane, which leads to rupture of the wire.

Carrying out the extrusion at a temperature below 150°when receiving wire from monolignol and stranded blanks in the casings of hardened alloy based on silver leads to cracking of the workpiece until the integrity of the ceramic lived due to the reduction of the ductility of the shell.

With increasing extrusion temperature conditions above 300°when receiving wire from monolignol and stranded blanks in the casings of hardened alloy based on silver is a violation of the geometry of the ceramic lived due to the reduction of the strength characteristics of the material of the shell is thinning ceramic lived in some places along the length of the veins and thickening ceramic lived in other places along the length of the veins.

Carrying out the extrusion at the size of the drawing ratio is less than 4 weeks is inadequate and requires an increase in the number of operations of extrusion and, therefore, increasing the total time warp strands billet to the desired size. Carrying out the extrusion at the magnitude of the coefficient hoods over 30 leads to a violation of the geometry of the ceramic lived-related difference in the mechanical properties of the extrudable material, which has a significant influence on the deformation of materials at high degrees of deformation.

Conducting rolling with heating, i.e. at a temperature above room temperature, is impractical because the strain exposed material with a ceramic core, which is at this stage in the form of powder (in the prototype - core metal). In addition, on the one hand, when used degrees of deformation per pass (1 to 50%) there is no need to warp with heat to increase the plasticity of rolled materials (as in method-prototype), on the other hand, the temperature rise of the rolling can lead to increased plasticity only shell and the violation of the geometry of the ceramic lived due to the reduction of the strength characteristics of the material of the shell, this can lead to thinning ceramic lived in some places along the length of the veins and thickening of the ceramic lived in other places along the length of the veins that always leads to a decrease of the critical current.

When rolling with the degree of deformation at about the od of less than 1% is a violation of the geometric dimensions of the wire, appears wave-like along the length of the wire, and when rolling with the degree of deformation per pass more than 50% rupture of membranes: from small cracks to its complete destruction, which leads to rupture of the wire.

Holding TMO at temperatures below 810°and above 840°and the degree of deformation per pass to less than 5% and more than 30% is not possible to form a ceramic core superconducting phase of the desired composition and structure, in particular, when the degree of deformation per pass to less than 5% at the intermediate deformation does not occur laying of the crystallites in the desired direction - the direction of primary current flow, and when the degree of deformation per pass more than 30% violation occurs geometry of the ceramic core. With decreasing temperature TMO below 810°does not occur With the formation of the superconducting phase in the ceramic core. With increasing temperature TMO above 840°With the formation of a large number of the liquid phase, which follows from the shell (for example, through the pores and cracks), which leads to disruption of the integrity of the shell, the violation of the stoichiometry of the ceramic core and a sharp deterioration of the critical characteristics of the superconductor.

The conduct of these operations in the described sequence and when these regimes have led to a new technical result is: the increase of critical current density due to a consistent seal ceramic core, improve geometry lived, improve boundary ceramic - shell, improve the texture of the ceramic core, the enhancement of the mechanical properties of the wire and the electrical resistance of the shell to reduce thermal conductivity of the shell and to simplify the method.

The example implementation. Metal capsules of hardened alloy Ag+1,1%Sn (tube length 200 mm, diameter 10 mm, wall thickness 1 mm shell morozilnik blanks) was filled with powder of bismuth ceramic composition (Bi-2223) from the calculation of the final fill factor moneilema wires 25%. Next, the resulting monosilane billet deformed by drawing at room temperature with the degree of deformation per pass 10%, after which he formed a multi-core preform by placing the shells stranded pieces of hardened alloy Ag+1,1%Sn dimensional parts deformed morozilnik blanks. As shells stranded blanks used pipes made of hardened alloy Ag+1,1%Sn (diameter 16 mm, wall thickness 1 mm, length 50 mm). Wrapped stranded procurement of hardened alloy Ag+1,1%Sn with a diameter of 16 mm was placed 217 dimensional parts deformed morozilnik blanks in the shell of hardened alloy Ag+1,1%Sn diameter of 0.82 mm, Then all received multi-strand billet was subjected to extrusion with the value of the coefficient of the hood 7 and 25 when those whom peraturan 150 and 300° C. Then all obtained after extrusion materials rolled without heating the air with the degree of deformation per pass 15%. Then all the wires held TMO in two stages at temperatures of 810 and 840°C for a total time of 200 hours with intermediate rolling with a degree of deformation per pass 12% to the final thickness of the wires on the basis (B1-2223) of 0.2-0.3 mm

The critical current in the wires was measured by standard four-point method on the criterion of 1 μv/see

All obtained by the proposed method the wires, the magnitude of the critical current density critical current is related to the square of the superconducting core) not less than 10.5 times higher than the best wires obtained with the use of metal powder, and at least 6% higher than on the wires, obtained on the basis of ceramic powders without using an extrusion process that characterizes the advantage of the proposed method.

Sources used

1. P.Haldar, L.Motovidlo. Processing High Critical Current Density of Bi-2223 Wires and Tapes. The Journal of The Minerals and Materials Society (JOM), Vol.44, No. 10, October 1992, p.54-58.

2. W.Gao, S.-C.Li et al. Synthesis of Bi-Pb-Sr-Ca-Cu Oxide/Silver Superconducting microcomposites by Oxidation of Metallic Precursors, Physica C 161 (1989), 71-75.

3. C.L.H.Thieme, D.Daly et.al. High Strain Warm Extrusion and Warm Rolling of Multiflamentary Bi-2223 Metallic Precursor Wire. Advances in Cryogenic Engineering(Materials), Vol.44 Edited by Balachandran et al., Plenum Press, New York, 1998, p.533-540 - prototype.

The method receiving the Oia long composite wire-based high-temperature superconducting compounds, including the formation of monolignol blanks by filling the powder in a metal sheath, its deformation to the desired size and cut-to-length part, Assembly, multi-strand billet obtained from dimensional parts by placing them in a metal shell, extrusion, rolling and thermomechanical processing, characterized in that the shell material monolignol procurement use hardened alloy based on silver, in her sleep powder bismuth ceramics, deformation monolignol procurement spend by drawing without heating with the degree of deformation per pass from 0.5 to 20%, as the material of the sheath stranded procurement use hardened alloy based on silver, extrusion multi-strand billet is carried out at a temperature of from 150 to 300°and with the size of the drawing ratio of from 4 to 30, rolling in the air without heating it with a degree of deformation per pass from 1 to 50% and thermomechanical processing is carried out in several stages at a temperature of from 810 to 840°and an intermediate deformation with deformation rate for a pass from 5 to 30%.



 

Same patents:

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: cable line engineering; solving problem of cable line immunity to external electromagnetic noise.

SUBSTANCE: proposed method for noise suppression in cable lines includes electrical interconnection of two cable conductors on one end directly or through resistors , addition of signals from their other ends, and at least partial disposition, principally symmetrical, of figures formed by one pair of conductors including conductors proper and space between them in space between other pair of conductors. Circuits of interconnected conductors are balanced, for instance, with respect to their resistance. Cable has two pairs of conductors, each pair is directly or mediately parallel-connected and figure formed by one pair of conductors that includes conductors proper and space between them is at least partially disposed in space between other pair of conductors, principally symmetrically. Cable manufacturing process includes insulation of conductors and their relative fastening in space; each pair of four conductors is directly or mediately parallel-connected and disposed in space so that figure formed by one pair of conductors incorporating conductors proper and space between them is at least partially disposed in space between other pair of conductors, principally symmetrically.

EFFECT: reduced fraction of electromagnetic noise in signal transferred over cable lines.

6 cl, 9 dwg

FIELD: multiple twin cables for communications in local network.

SUBSTANCE: proposed multiple twin cable designed to prevent vapor transfer when immersed in petroleum oil has internal and external sheaths that cover insulated signal-transferring conductors and are made in the form of helical structure. Core filler fills up core and spaces between signal transferring conductors. Core filler and internal sheath are made of vapor-tight material and fixed to insulated conductors so that they fill up all grooves and slots around signal transferring conductors. External gas-tight sheath can be provided to make it possible to immerse cable in petroleum oil for long time intervals without impairing its functional capabilities.

EFFECT: ability of preventing vapor transfer lengthwise of cable.

26 cl, 4 dwg

FIELD: electrical engineering; cable filler compositions.

SUBSTANCE: proposed PVC base composition designed for filling conductor-to-conductor space of electric cables by extrusion has following ingredients, parts by weight: divinyl-styrene thermal elastomer, 100; high-pressure polyethylene, 40 - 60; mineral oil, 80 - 95; chalk or kaolin, or aluminum hydroxide, 100 - 50.

EFFECT: enhanced fluidity index and frost resistance; ability of retaining cable flexibility at sub-zero temperatures.

1 cl

FIELD: controlling electric cable sheath capacitive reactance.

SUBSTANCE: proposed method for controlling capacitive reactance of tubular sheath formed by means of extrusion of insulating compound on electric cable in extrusion head includes introduction of foaming agent in insulating compound so as to enhance capacitive reactance of tubular insulating sheath; prior to do so, definite amount of foaming agent is used so as to obtain predetermined capacitive reactance for tubular insulating sheath and in order to ensure precision control of capacitive reactance of tubular insulating sheath, gas pressure is applied to at least external surface area of insulating compound extruded by extrusion head, gas pressure being varied so as to control capacitive reactance value of tubular insulating sheath.

EFFECT: enhanced precision of controlling capacitive reactance of electric-cable sheath.

9 cl, 3 dwg

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

Electric cable // 2256969

FIELD: electrical engineering; electric cables for signaling, control, and data transfer and processing systems.

SUBSTANCE: cable has at least one pair of insulated and stranded current-carrying conductors and cable sheath. Insulating material is either halogen-containing polymer (polyvinyl chloride), or halogen-free polyolefin base material (polyethylene), or its copolymer. Insulation thickness is chosen from equation strand pitch is found from equation h = 25(2Δ + d), where d is conductor diameter; εr is relative dielectric constant of insulating material. With diameter of cable current-carrying conductors being enlarged, capacitance of cable pair was reduced (other characteristics being retained at desired level.

EFFECT: enhanced capacitance of working load on cable pair.

1 cl, 4 dwg, 1 tbl

FIELD: electrical engineering.

SUBSTANCE: invention relates to manufacture of electroconductive materials by way of applying electroconductive coating, impregnated-paper insulation, and electroconductive threads of power cables onto paper base. In particular, material consists of natural paper base and electroconductive layer, whose thickness constitutes 0.03-0.14 that of insulation layer placed on paper and composed of aqueous suspension of carbon black (6-10%) and polyvinyl alcohol (1.0-4.0%) together with additives of acrylic acid ester/methacrylic acid ester copolymer (7-12%) and oxyethylated (with at least 7 ethylene oxide groups) alkylphenol or sodium polyacrylate (0.1-0.5%).

EFFECT: improved workability, electrical conductivity, strength, elasticity, heat resistance, moisture resistance, and resistance to splitting within cable.

3 tbl

FIELD: electrical engineering; drying cable insulation in servicing communication lines.

SUBSTANCE: proposed electroosmotic method for drying paper insulation of cable involves setting-up of electric field; in the process cable conductors are connected to positive pole of current supply, metal electrodes whose quantity depends on that of cable conductors are inserted in paper insulation at open end of cable and connected to negative pole of power supply; damp cable section is cut off. Used as metal electrodes are aluminum or copper strips deepened through 2 m. Voltage of 500 - 2500 V is applied for 6 - 8 h.

EFFECT: enhanced cable saving due to reduced size of cut-off ends.

1 cl

FIELD: cable engineering; plastic-covered sector cables.

SUBSTANCE: proposed extrusion head that provides for regulating insulation thickness over perimeter of sector cable cores has body, mandrel holder, mandrel with cylindrical part, die, mandrel evacuation device, and device for positioning conducting core in mandrel; two cuts symmetrical relative to vertical axis of mandrel are made on external surface of its cylindrical part; these cuts are disposed so that fixed radiant position of sector in mandrel is ensured and its rays originate from geometric center of mandrel and cross points limiting left- and right-hand rounding of sector; angle between symmetry axes of cuts is not over 180 deg.; angle of cuts to generating lines of cylinder is minimum 1 deg.

EFFECT: reduced material input of cable.

1 cl, 3 dwg, 1 tbl

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: 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: 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: 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 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

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

Up!