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A preparation method of bi-2223/agau superconducting tape with high current carrying and low thermal conductivity

A bi-2223, superconducting tape technology, applied in the use of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc. , low density of strip core wire, etc., to achieve the effect of low thermal conductivity, high current-carrying performance and low manufacturing cost

Active Publication Date: 2022-06-03
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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  • A preparation method of bi-2223/agau superconducting tape with high current carrying and low thermal conductivity
  • A preparation method of bi-2223/agau superconducting tape with high current carrying and low thermal conductivity

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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 a balance gas of argon with a mass purity of 99.995%, a vibrating table is used to install a tube under the condition of a vibration frequency of 40 Hz, and the Bi-2223 precursor powder is passed through a metal funnel Fill the AgAu alloy tube with one end closed, and start the vibrating table to vibrate the AgAu alloy tube, 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 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 the Au element in the AgAu alloy tube is 5%;

[0029] In step 2, the first tube-loading composite body obtained in step 1 is drawn with a...

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 a balance gas of argon with a mass purity of 99.995%, a vibrating table is used to install a tube under the condition of a vibration frequency of 40 Hz, and the Bi-2223 precursor powder is passed through a metal funnel Fill the AgAu alloy tube with one end closed, and start the vibrating table to vibrate the AgAu alloy tube, 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 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 the Au element in the AgAu alloy tube is 5%;

[0036] In step 2, the first tube-loading composite body obtained in step 1 is drawn wit...

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 a balance gas of argon with a mass purity of 99.995%, a vibrating table is used to install a tube under the condition of a vibration frequency of 40 Hz, and the Bi-2223 precursor powder is passed through a metal funnel Fill the AgAu alloy tube with one end closed, and start the vibrating table to vibrate the AgAu alloy tube, 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 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 the Au element in the AgAu alloy tube is 5%;

[0043] In step 2, the first tube-loading composite body obtained in step 1 is drawn wit...

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Abstract

The invention discloses a method for preparing a Bi-2223 / AgAu superconducting tape with high current-carrying and low thermal conductivity. The method comprises: 1. Filling the Bi-2223 precursor powder into an AgAu alloy tube to obtain the first tube-filled compound 2. After drawing, the single-core wire rods are bundled and assembled into the AgAu alloy tube to obtain the second tube composite body; 3. After the pass rolling, the drawing is processed, and then the multi-core Bi‑2223 is made by flat roll rolling / AgAu tape; 4. Obtain Bi‑2223 / AgAu superconducting tape through heat treatment. The present invention adopts AgAu alloy tubes with low thermal conductivity as the inner and outer sheaths, combined with multi-roller pass rolling, which ensures the cooperative deformation between the metal sheath and the ceramic core wire, and the prepared multi-core Bi-2223 / AgAu strip has The lower thermal conductivity, higher core wire density and critical current density are beneficial to the application in high-temperature superconducting current leads.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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