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High-performance bismuth series high-temperature superconducting strip and preparation method thereof

A high-temperature superconducting tape, high-performance technology, applied in the usage of superconducting elements, superconducting devices, cable/conductor manufacturing, etc., can solve the problem of affecting the connection of superconducting grains and affecting the criticality of bismuth-based high-temperature superconducting tapes current density etc.

Inactive Publication Date: 2009-06-24
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the subsequent rolling process, the orientation of the columnar or spherical grains is random, which will affect the connection between the superconducting grains in the final superconducting strip, which seriously affects the criticality of the bismuth-based high-temperature superconducting strip. Increased current density

Method used

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  • High-performance bismuth series high-temperature superconducting strip and preparation method thereof
  • High-performance bismuth series high-temperature superconducting strip and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] See figure 1 . Take the single core wire (strip) material as an example, take the main phase of BSCCO-2212 precursor powder 15g, press the precursor powder 1 into a column, put it into the silver sleeve 2, and then undergo multiple passes of drawing and deformation (see Ueyama M, Hikata T, Kato K, et al. Microstructures and J c -BCharacteristics of Ag-Sheathed Bi-Based Superconducting Wires.Jpn.J.Appl.Phys.1991, 30: L1384-L1386) becomes a single-core round wire wire, the obtained wire is equally divided into 37 sections and then loaded into a silver alloy sleeve In the tube, a multi-core wire with a diameter of 1.5 mm is obtained through multiple passes of drawing. See figure 2 , The multi-core wire is subjected to the first heat treatment (HT1) at 650°C, with argon and oxygen or nitrogen and oxygen as protective gas, and the oxygen partial pressure is 0.02 atm, and the heat treatment time is 10 hours. Then, the wire rod was rolled into a strip of 0.6 mm (thickness)×2.5 mm...

Embodiment 2

[0027] Press 20 grams of the precursor powder with the main phase of BSCCO-2212 into a cylindrical shape and put it into a silver sleeve. After mechanical deformation, a single-core round wire is obtained. The obtained round wire is divided into 61 sections and loaded into the silver alloy sleeve. Drawing into a multi-core round wire with a diameter of 1.6 mm. The multi-core wire is heat-treated (HT1) at 820°C, with argon and oxygen or nitrogen and oxygen as protective gas, the oxygen partial pressure is 0.2 atm, and the heat treatment time is 25 hours. Then, the wire rod was rolled into a strip of 1.0 mm (thickness)×1.5 mm (width). The strip is heat treated at 820°C for 25 hours (HT2), argon and oxygen or nitrogen and oxygen are used as protective gas, and the oxygen partial pressure is 0.2atm. The wire rod is then rolled into a strip with a size of 0.23 mm (thickness) x 4.1 mm (width).

[0028]The above-prepared superconducting tape cuts 5 short samples with a length of about 4....

Embodiment 3

[0029] Press 10 grams of the precursor powder whose main phase is BSCCO-2212 into a cylindrical shape and put it into a silver sleeve, and then mechanically deform it to obtain a single-core round wire. The obtained round wire is divided into 19 sections and put into the silver alloy sleeve. Then draw a multi-core round wire with a diameter of 1.75 mm. The multi-core wire is heat-treated (HT1) at 720°C, with argon and oxygen or nitrogen and oxygen as protective gas, the oxygen partial pressure is 0.1 atm, and the heat treatment time is 10 hours. Then, the wire rod was rolled into a strip of 0.5 mm (thickness)×0.7 mm (width). The strip is heat-treated at 720°C for 15 hours (HT2), where argon and oxygen or nitrogen and oxygen are used as protective gas, and the oxygen partial pressure is 0.1 a tm. The wire rod was then rolled into a strip with a size of 0.21 mm (thickness) × 4.2 mm (width).

[0030] From the superconducting tape prepared above, cut 10 short samples with a length of ...

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Abstract

The invention relates to a bismuth system high temperature superconducting tape and the preparation method thereof. The tape consists of a metal sheath and a superconducting core positioned in the metal sheath; the main phase of the superconducting core is (Bi, Pb)2Sr2Ca2Cu3Oy; the weight percentage content of the main phase is 75 to 98 percent of the superconducting core; the second phase is any two among CuO, (Ca, Sr)2CuO3, (Ca, Sr)14Cu24O41, Bi2Sr2CuO6, Ca2PbO4, SrCaCuO, CaCuO and Pb3Sr2.5Bi0.5Ca2CuOy, or more than two combinations; the weight percentage content of the second phase is 2 to 25 percent of the superconducting core; and the material of the metal sheath is silver or silver alloy. By adopting the method, the prepared bismuth system high temperature superconducting tape has the advantages of high performance and relative high critical current density.

Description

Technical field [0001] The present invention relates to a method based on BSCCO-2223 (ie (Bi, Pb) 2 Sr 2 Ca 2 Cu 3 O y ) High-performance bismuth-based high-temperature superconducting tape with main phase and preparation method thereof. Background technique [0002] Bismuth-based high-temperature superconducting tape is currently the only high-temperature superconducting material that can be produced on a large scale. Significant breakthroughs have been made in the research and development of superconducting cables, superconducting motors, superconducting current limiters, superconducting magnetic separators, and superconducting energy storage systems made of bismuth-based high-temperature superconducting tapes, and many projects have entered prototypes Trial operation stage. But only a small part of the products can enter the market application. [0003] The preparation method of bismuth-based high-temperature superconducting (Bi-2223 / Ag) strips is generally to first fill the s...

Claims

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Application Information

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IPC IPC(8): H01B12/02H01B13/00C04B35/45C04B35/622
CPCY02E40/641Y02E40/60
Inventor 陈兴品李明亚
Owner CHONGQING UNIV
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