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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 use of superconducting elements, superconducting devices, cable/conductor manufacturing, etc. grain connection problems

Inactive Publication Date: 2010-10-27
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
  • High-performance bismuth series high-temperature superconducting strip and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0025] see figure 1 . Taking the single-core wire (ribbon) material as an example, take 15g of BSCCO-2212 precursor powder as the main phase, press the precursor powder 1 into a columnar shape, put it into the silver sleeve 2, and then undergo multi-pass drawing 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) become the wire rod of single core round wire, the obtained wire rod is divided into 37 segments and put into silver alloy sleeve tube, and then through multiple passes of drawing to obtain a multi-core wire with a diameter of 1.5 mm. see figure 2 , the multi-core wire is subjected to the first heat treatment (HT1) at 650° C., argon and oxygen or nitrogen and oxygen are used as protective gases, 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 (thickn...

Embodiment 2

[0027] Press 20 grams of the precursor powder whose main phase is BSCCO-2212 into a columnar 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 segments and loaded into a silver alloy sleeve. Drawing and making diameter is the multi-core garden wire rod of 1.6 millimeters. The multi-core wire is subjected to heat treatment (HT1) at 820° C., argon and oxygen or nitrogen and oxygen are used as protective gases, 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 was heat-treated at 820° C. for 25 hours (HT2), argon and oxygen or nitrogen and oxygen were used as protective gases, and the oxygen partial pressure was 0.2 atm. The wire rod was then rolled into a strip having dimensions 0.23 mm (thickness) x 4.1 mm (width).

[0028]Five short samples of the supercond...

Embodiment 3

[0030] Press 10 grams of the precursor powder whose main phase is BSCCO-2212 into a columnar shape and put it into a silver sleeve, then obtain a single-core round wire through mechanical deformation, divide the obtained round wire into 19 segments and put it into a silver alloy sleeve. Pull out and make diameter again and be the multi-core garden wire rod of 1.75 millimeters. The multi-core wire is subjected to heat treatment (HT1) at 720° C., argon and oxygen or nitrogen and oxygen are used as protective gases, 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 was heat-treated at 720° C. for 15 hours (HT2), in which argon and oxygen or nitrogen and oxygen were used as protective gases, and the oxygen partial pressure was 0.1 atm. The wire rod was then rolled into a strip having dimensions 0.21 mm (thickness) x 4.2 mm (width).

[0031] Cut 10 short sampl...

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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 anytwo 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 to25 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 kind of BSCCO-2223 (namely (Bi, Pb) 2 Sr 2 Ca 2 Cu 3 o y ) is a high-performance bismuth-based high-temperature superconducting tape with a main phase and a preparation method thereof. Background technique [0002] Bismuth-based high-temperature superconducting tape is currently the only high-temperature superconducting material that can be mass-produced. Major breakthroughs have been made in the research and development of superconducting cables, superconducting motors, superconducting current limiters, superconducting magnetic separators, superconducting energy storage systems and other products made of bismuth-based high-temperature superconducting tapes, and many projects have entered the prototype trial run phase. But it is only a small part of the products that can enter the market application. [0003] The preparation method of bismuth-based high-temperature superconducting (Bi-2223 / Ag) strips is general...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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