Manufacturing method of superconducting multiply bend

FIELD: metallurgy.

SUBSTANCE: on surface of plate made from titanium it is located powder of high-temperature superconducting (HTSC) compound and it is implemented cold deformation by means of rolling with receiving of preferred-orientation scales of HTSC compound. Scales are separated from substrate, it is collected multilayer packet from scales with alternating spacers from silver and it is pressed with formation of multilayer composite silver-HTSC-silver. Composite is placed into envelope made of silver, it is rolled with receiving of band of specified geometry and is thermal treated at temperatures in the range 800-930°C during 20-100 hours.

EFFECT: increasing current-carrying ability of band and filling factor by superconductor.

2 ex

 

The invention relates to the development of metallurgical techniques for fabrication of superconducting HTS wires and tapes for use in power transmission lines, superconducting magnetic systems, generators, electric motors, magnetic bearings, electrical energy and other

Most of the known high-temperature superconductors (HTSC) are fragile substances and therefore for the production of these wires and tapes the most widely used of the so-called "RT" (powder in tube). For the first time this method is applied to the connection Nb3Sn was applied Kanzleramt in 1961 [J.E.Kunzler / Rev. Mod. Phys., 1961, v.33, R]. According to this method, the niobium tube or a tube made of Monel metal in stoichiometric ratio (3:1) fill with a mixture of powders of niobium and tin, or a mixture of powders of the compounds of Nb3Sn and pure tin (9:1). Then pipe on both sides is closed, and further subjected to drawing through a Spinneret to the specified diameter (range 0.38-0.5mm). At the final stage in the process of heat treatment (970-1400°C) in the core tube is formed of a superconducting phase Nb3Sn. At the same time, were obtained superconducting Nb3Sn wires with Twith=17,8 and current-carrying capacity

1,5·105A/cm2in a magnetic field 88 EC. Method of Kunzler vanadium in the shell floor is obtained superconducting wire with a core of V 3Si and V3Ga. This breakthrough achievement was the beginning of the rapid development of studies of superconductors. The main disadvantage of superconducting composites produced by the method of Kunzler is their high embrittlement after annealing and, consequently, cannot be re-used.

Later in connection with the discovery in 1986 of the HTSC compounds with values of Twithabove

77 K, this method has been further development and application. Closest to the proposed method is a method described in [H.L.Zheng, Z.M.Yu, X.M.Xiong et al. Effect of precursor powder on microstructure and critical current density of (Bi, Pb)-2223 tapes. Physica C 386, (2003), R-141]. The pipe often made of silver lay different compositions of HTSC compounds (or of the ingredients which are in the process of heat treatment is formed HTS). Then the ends of the pipe with powder presoviet and deform in different ways (by rolling, drawing, pressing, and others) to a specified geometric size. At the final step, the tape or wire is subjected to heat treatment under optimized modes.

Made as solid and stranded conductors with different sizes of thickness, width and length. The level density of the superconducting currents of HTS tapes produced by the closest method the powder in tube (according to American Superconductor) directly is edstone the superconductor at nitrogen temperatures (77 K) in its own magnetic field, as a General rule is 1·104-7·104A/cm2(maximum constructive current density ≈2·104A/cm2).

This method along with certain advantages, such as relative ease of implementation, has some significant drawbacks:

in these tapes, there has been a sharp decrease in the critical current density in an external magnetic field (of the order of several hundred Oersted) at the temperature of liquid nitrogen is 77 K;

in the process of deformation processing in the HTS core due to the lack of uniformity of the density of go to sleep powder arise waists, breaks manifests itself in the so-called "sausages effect;

the fill factor for HTS material in the ribbon or wire due to the low density sleeps powder after deformation processing does not exceed 30-35%;

- unable to achieve sharp texture in the basal plane HTS-lived or interlayer;

- unable to obtain a uniform cross-section HTS lived both in the transverse and in longitudinal section.

The problem to which the present invention is directed, is to create a method of manufacturing a superconducting multilayer tape with elevated values of the current-carrying capacity at the liquid nitrogen temperature of 77 K.

The technical result of the invention is to improve electrical conductivity is the ability of the tape and fill factor in the superconductor due to the formation of more high-density layers of HTS compounds (Y-123, Bi-2223, Bi-2212 and others) with a sharp basal texture in the plane of the tape.

The technical result is achieved in that in the method of manufacturing a superconducting multilayer tape that includes filling a shell of silver powder from various HTSC compounds deformation to the desired size and heat treatment, according to the invention before being placed in a silver shell powder is subjected to a preliminary texturing due to cold rolling on the surface of the plate made of titanium with values of strength and hardness in 2 times higher than that of pure silver, then laminated HTS layer in the form of flakes separated from the titanium substrate of the laminated flakes trying to enter multi-layer package with alternating strips of silver, it pressed for the formation of multilayered composite: Ag-HTS Ag, which is then again placed in a sheath of silver, is deformed by rolling to specified geometric dimensions of the ribbon, and conducting heat treatment (depending on the specific HTS compounds at temperatures in the range 800-930°C for 20 to 100 hours.

The invention

Through the development of a new method of cold-formed by rolling HTS powder on the surface more durable and more rigid metal substrate than silver, in particular titanium obtained high-density (up to 95-98%), thin (10-40 what km) coating or flakes HTSC compounds with acute basal texture and most importantly, easily separating from the backing sheet after cold rolling. This merit allows you to use instead of loose powder pre-textured and dense scales, layer for use as a current-carrying material in the wires and multi-layer HTS tapes with a shell of silver. In addition, the use of pre-textured HTSC powders can increase the density of the core, even filling in length and fill factor. However, more than 2 times increases the density of the transport current in comparison with the known analogues and the prototype.

Example 1

1. Of pure titanium by rolling get a tape width of 8 to 10 mm and thickness of 3.2 to 3.4 mm

2. After rolling carry out recrystallization annealing at 800°C for 15 minutes

3. After annealing on the surface of the tape by pressing the extruded longitudinal groove width of 4-5 mm, depth up to 1.0 mm.

4. Then there is the filling of the notches HTSC powder.

5. After this tape with the powder is subjected to further cold rolling. To prevent sticking of powder to the rolls of a rolling mill between the roller and rolled the tape is laid foil of titanium. It is the application of a strip of titanium allows for cold rolling HTSC powders without sticking of powder to the surface of the rolls. The reduction in cold-formed for 1 prochoda this is 0.2-0.3 mm

6. After reaching the ribbon thickness 2,0-2,2 mm coating, laminated on a substrate made of titanium, is separated in the form of a thin high-density layer with a sharp base texture (the degree of texture in 1,5-2 times higher than in the case of rolling on silver).

7. Of these layers in an amount of 5 to 10 or more is made package with alternating layers of silver, which is placed in the shell of silver, and is then cold rolling the strip to a predetermined thickness (0.3 to 0.4 mm). At the final step, the tape containing phase Bi-2223, are annealed in air at temperatures 830-850°C for 50-100 hours, the tape containing phase Bi-2212, annealed in argon at temperatures in the range of 800-830°C, and in the case of compound Y-123 annealing is conducted in an atmosphere of oxygen at temperatures in the range of 900-930°C for 24-100 hours.

The result of these technological operations phase after cold rolling on the titanium phase Bi-2223 variation of the orientation of the grains (A), defined by the half-width of the maximum, decreases from Δ≈15° (for the case of a silver substrate) to Δ≈10° (for titanium substrate). The fill factor for HTSC phase in the feed increases to 50%, also increases the density of the superconducting layer up to 95-98%. These factors contribute to a 2-fold increase in constructive critical current density multilayer surprosed the soup tape (J cto ~ 3-4·104A/cm2in the self-magnetic field at a temperature of 77 K) in comparison with many famous companies producing HTS tapes powder "RT". When this cross-section (thickness) laminated HTS layers remained virtually unchanged ("sausages effect on the length of the laminated tape is practically not shown), and the fill factor of the superconductor in the amount of ribbon through the application instead of powder high-density HTS scales increased 1.5 times.

Example 2

After carrying out cold rolling of powders HTSC compounds on the surface of a substrate of titanium to a thickness of ≈100 μm and less on the floor of the HTS by spraying apply a thin layer of silver of a thickness of 5-20 μm.

In the next phase HTS coating is separated from the titanium substrate and cut into 5-10 pieces of equal length and then layered composite of (5-10 layers) presoviet in the recess on the surface of the silver substrate. Prepared procurement (composite)containing a multilayer package of HTS layers and layers of silver, then again deform methods of cold rolling the strip to a predetermined thickness (0.25 to 0.4 mm).

At the end of the tape is subjected to prolonged annealing depending on the use of HTSC compounds, or air in the case of phase Bi-2223, oxygen - Y-123 is in argon with respect to the phase of the Bi-2212 at temperatures 800-930°C for 20 to 100 hours.

The result of these technological operations is enhanced texture in the HTS layer, due to the small thickness of the layers of silver increases the fill factor on HTSC phase to 55%, and up to 95-98% increases the density of the superconducting layer. These factors contribute to a 2-3 fold increase in constructive critical current density superconducting multilayer tape (Jcto ~ 4-5·104A/cm2in the self-magnetic field at a temperature of 77 K) in comparison with many famous companies producing HTS tapes powder "RT". When this cross-section (thickness), laminated HTS layers, the length of the tape is practically unchanged ("sausages effect practically not shown). In the proposed method, in contrast to the known provides easier access of oxygen during the heat treatment, which allows to reduce the duration of annealing at the final stage of manufacture of the tape.

A method of manufacturing a superconducting multilayer tape, including placing on the surface of the plate of titanium powder of high-temperature superconducting (HTS) compounds, cold deformation by rolling with getting textured scales HTSC compounds, the separation of scales from the titanium substrate, the Assembly of a multilayer stack of scales series with the corresponding strips of silver, compressing the received packet with the formation of multilayered composite silver-HTS-silver, placement of the composite coating of silver, deformation by rolling with getting the tape given geometrical dimensions and heat treatment at temperatures in the range 800-930°C for 20 to 100 hours



 

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