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Preparation method of Bi-2223/AgAu superconducting tape with high current-carrying capacity and low thermal conductivity

A technology of bi-2223 and superconducting tape, which is applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc., can solve the problem of limiting the development of high-temperature superconducting current leads and uneven silver/superinterface , Low density of strip core filaments, etc., to achieve low thermal conductivity, high current-carrying performance, and low manufacturing cost

Active Publication Date: 2021-10-08
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Compared with conventional Bi-2223 / Ag tapes, the current-carrying performance of Bi-2223 / AgAu tapes is still low, which severely limits the development of high-temperature superconducting current leads in China.
At present, the main problem in the preparation process of Bi-2223 / AgAu strip is that the strength of Ag-Au alloy is lower than that of Ag-Mg alloy after annealing, which is basically the same as that of pure Ag
Therefore, the AgAu / AgAu sheath with lower strength has a different effect on the core filament density and Ag / superinterface during mechanical deformation than the traditional Ag / AgMg sheath, which in turn will lead to lower core filament density and Ag / superinterface in the final strip. Problems such as uneven super interface
Therefore, the current-carrying performance of Bi-2223 / AgAu prepared by different processes is usually 20%-30% lower than that of conventional Bi-2223 / Ag tapes

Method used

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  • Preparation method of Bi-2223/AgAu superconducting tape with high current-carrying capacity and low thermal conductivity
  • Preparation method of Bi-2223/AgAu superconducting tape with high current-carrying capacity and low thermal conductivity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This embodiment includes the following steps:

[0028]Step 1. In a glove box with an oxygen volume content of 7.5% and an equilibrium gas of argon gas with a mass purity of 99.995%, use a vibrating table to vibrate the tube at a vibration frequency of 40 Hz, and pass the Bi-2223 precursor powder through a metal funnel Fill it into an AgAu alloy tube with one end closed, and start the vibrating table to vibrate the AgAu alloy tube at the same time, so that the Bi-2223 precursor powder is filled into the AgAu alloy tube, and then the other end of the AgAu alloy tube is sealed to obtain the first filled tube Composite; the Bi-2223 precursor powder contains Bi-2212 and CaCuO 2 , and Bi-2212 and CaCuO 2 The molar ratio of the AgAu alloy tube is 1:1, the outer diameter of the AgAu alloy tube is 12mm, the wall thickness is 1mm, and the mass content of Au element in the AgAu alloy tube is 5%;

[0029] Step 2: Draw the first tube-loading complex obtained in step 1 with a pass ...

Embodiment 2

[0034] This embodiment includes the following steps:

[0035] Step 1. In a glove box with an oxygen volume content of 7.5% and an equilibrium gas of argon gas with a mass purity of 99.995%, use a vibrating table to vibrate the tube at a vibration frequency of 40 Hz, and pass the Bi-2223 precursor powder through a metal funnel Fill it into an AgAu alloy tube with one end closed, and start the vibrating table to vibrate the AgAu alloy tube at the same time, so that the Bi-2223 precursor powder is filled into the AgAu alloy tube, and then the other end of the AgAu alloy tube is sealed to obtain the first filled tube Composite; the Bi-2223 precursor powder contains Bi-2212 and CaCuO 2 , and Bi-2212 and CaCuO 2 The molar ratio of the AgAu alloy tube is 1:1, the outer diameter of the AgAu alloy tube is 12mm, the wall thickness is 1.1mm, and the mass content of Au element in the AgAu alloy tube is 5%;

[0036] Step 2: Draw the first tube-loading complex obtained in step 1 with a pa...

Embodiment 3

[0041] This embodiment includes the following steps:

[0042] Step 1. In a glove box with an oxygen volume content of 7.5% and an equilibrium gas of argon gas with a mass purity of 99.995%, use a vibrating table to vibrate the tube at a vibration frequency of 40 Hz, and pass the Bi-2223 precursor powder through a metal funnel Fill it into an AgAu alloy tube with one end closed, and start the vibrating table to vibrate the AgAu alloy tube at the same time, so that the Bi-2223 precursor powder is filled into the AgAu alloy tube, and then the other end of the AgAu alloy tube is sealed to obtain the first filled tube Composite; the Bi-2223 precursor powder contains Bi-2212 and CaCuO 2 , and Bi-2212 and CaCuO 2 The molar ratio of the AgAu alloy tube is 1:1, the outer diameter of the AgAu alloy tube is 12mm, the wall thickness is 1.5mm, and the mass content of Au element in the AgAu alloy tube is 5%;

[0043] Step 2: Draw the first tube-packing complex obtained in step 1 with a pr...

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Abstract

The invention discloses a preparation method of a Bi-2223 / AgAu superconducting tape with high current-carrying capacity and low thermal conductivity. The method comprises the following steps of: 1, filling Bi-2223 precursor powder into an AgAu alloy tube to obtain a first tubing complex; 2, bundling and assembling drawn single-core wires into an AgAu alloy tube to obtain a second tubing complex; 3, carrying out drawing machining after hole pattern rolling, and then manufacturing a multi-core Bi-2223 / AgAu strip through flat roll rolling; and 4, carrying out heat treatment to obtain the Bi-2223 / AgAu superconducting tape. According to the preparation method, the AgAu alloy tubes with low thermal conductivity are used as an inner sheath and an outer sheath, and multi-roll pass rolling is combined, so that the synergistic deformation between the metal sheath and the ceramic core wire is ensured, and the prepared multi-core Bi-2223 / AgAu strip has lower thermal conductivity, higher core wire density and critical current density, and is beneficial to application to high-temperature superconducting current leads.

Description

technical field [0001] The invention belongs to the technical field of preparation of superconducting materials, in particular to a method for preparing a Bi-2223 / AgAu superconducting tape with high current carrying capacity and low thermal conductivity. Background technique [0002] Bi-2223 / AgAu strips prepared by powder in tube method (PIT) are known for their high critical current density (J c ) and low thermal conductivity, it is considered to be one of the best materials for preparing high-temperature superconducting current leads. The critical current density of the Bi-2223 / AgAu tape is one of the most important parameters for its application. By increasing the critical current density of the Bi-2223 / AgAu superconducting tape and optimizing the structure of the current lead, the current-carrying performance of the current lead can be improved. Rapidly increased, while the leakage heat gradually decreased. Therefore, high-temperature superconducting current leads made...

Claims

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Application Information

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IPC IPC(8): H01B12/10H01B12/00H01B12/14
CPCH01B12/10H01B12/00H01B12/14Y02E40/60
Inventor 马小波李成山张胜楠冯建情刘国庆
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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