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A kind of welding joint and welding method of low-resistance yttrium-based high-temperature superconductor based on nano-silver solder

A welding method and technology of high-temperature superconducting strips, which are applied in welding/fusion connections, conductors, welding equipment, etc., can solve problems such as cracks, joint performance degradation, and performance degradation of yttrium-based high-temperature superconducting strips. Simple operation, short welding time, no effect on superconductivity

Inactive Publication Date: 2020-09-11
BEIJING JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the diffusion welding process has high requirements on temperature and pressure control. Although increasing the pressure properly can improve the uniformity of the Ag diffusion layer, excessive pressure will cause cracks in the brittle ceramic superconducting layer inside the strip, which will lead to joint failure. performance degradation
In addition, too high welding temperature will also lead to serious degradation of the performance of the yttrium-based high-temperature superconducting strip

Method used

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  • A kind of welding joint and welding method of low-resistance yttrium-based high-temperature superconductor based on nano-silver solder
  • A kind of welding joint and welding method of low-resistance yttrium-based high-temperature superconductor based on nano-silver solder
  • A kind of welding joint and welding method of low-resistance yttrium-based high-temperature superconductor based on nano-silver solder

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Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1 A kind of welding of low-resistance yttrium-based high-temperature superconductor based on nano-silver solder

[0027] A welding method of a low-resistance yttrium-based high-temperature superconductor based on nano-silver solder, comprising the following steps:

[0028] (1) Preparation of nano-silver solder: Stir and mix 1L of sodium citrate solution with a concentration of 10g / L and 3.75L of deionized water and heat to 80°C, add 85mL of silver nitrate solution with a concentration of 10g / L to the reaction kettle middle. Subsequently, 100 mL of sodium borohydride solution with a concentration of 1 g / L was quickly added to the above reaction system, and after vigorous stirring at 80° C. for 1.5 h, it was gradually cooled to room temperature to obtain a monodisperse nano-silver colloidal dispersion with a particle size of 5 nm;

[0029] (2) Preparation of monodisperse nano-silver ethanol dispersion: the monodisperse nano-silver colloidal dispersion of parti...

Embodiment 2

[0031] Embodiment 2 Welding of a low-resistance yttrium-based high-temperature superconductor based on nano-silver solder

[0032] A welding method of a low-resistance yttrium-based high-temperature superconductor based on nano-silver solder, comprising the following steps:

[0033](1) Preparation of nano-silver solder: Stir and mix 1L of sodium citrate solution with a concentration of 10g / L and 3.75L of deionized water and heat to 80°C, add 85mL of silver nitrate solution with a concentration of 10g / L to the reaction kettle middle. Subsequently, 100 mL of sodium borohydride solution with a concentration of 1 g / L was quickly added to the above reaction system, stirred vigorously at 80° C. for 1.5 h, and then gradually cooled to room temperature to obtain a monodisperse nano-silver colloid solution (S1) with a particle size of 5 nm. Under the condition of vigorous stirring at 80° C., 2 L of S1 solution was added to 400 mL of a mixed solution of 10 g / L sodium citrate solution a...

Embodiment 3

[0036] Embodiment 3 Welding of a low-resistance yttrium-based high-temperature superconductor based on nano-silver solder

[0037] A welding method of a low-resistance yttrium-based high-temperature superconductor based on nano-silver solder, comprising the following steps:

[0038] (1) Preparation of nano-silver solder: Stir and mix 1L of sodium citrate solution with a concentration of 10g / L and 3.75L of deionized water and heat to 80°C, add 85mL of silver nitrate solution with a concentration of 10g / L to the reaction kettle middle. Subsequently, 100 mL of sodium borohydride solution with a concentration of 1 g / L was quickly added to the above reaction system, stirred vigorously at 80° C. for 1.5 h, and then gradually cooled to room temperature to obtain a monodisperse nano-silver colloid solution (S1) with a particle size of 5 nm. Under the condition of vigorous stirring at 80° C., 2 L of S1 solution was added to 400 mL of a mixed solution of 10 g / L sodium citrate solution ...

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Abstract

The invention discloses a welding joint and a welding method of a low-resistance yttrium-based high-temperature superconductor based on nano-silver solder. In the welding joint of low-resistance yttrium-based high-temperature superconductor based on nano-silver solder of the present invention, the nano-silver solder is a monodisperse nano-silver colloidal dispersion with a particle size of 5 to 80 nm. The welding method of the present invention forms a metal silver diffusion interconnection structure at the interface of two superconducting strips. Compared with traditional low-temperature soldering, the welded joint has higher electrical conductivity and mechanical strength; the resistance of the 77K joint reaches nanoohm level (10 ‑9 Ω), the joint shear strength can reach 20~70MPa. In addition, the welding method of the present invention has a low welding temperature and a short welding time, has no impact on the superconducting properties of the yttrium-based high-temperature superconducting strip, and the critical current of the strip does not change before and after welding.

Description

technical field [0001] The invention relates to the technical field of superconducting strip welding. More specifically, it relates to a welding joint and welding method of a low-resistance yttrium-based high-temperature superconductor based on nano-silver solder. Background technique [0002] The second-generation yttrium-based high-temperature superconductor has extremely excellent superconducting properties at liquid nitrogen temperature (77K) (critical current density J c More than 106A / cm 2 , the irreversible field can reach 7T), so it has great application potential in the field of superconducting generators, superconducting current limiters, superconducting transformers and superconducting magnet energy storage systems, and is considered to be the most promising application in the future. one of the superconducting materials. However, due to many factors such as the complex process of multi-layer coating, the difficulty in controlling the uniformity of the deposite...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01R4/02H01R43/00B23K35/40H01L39/00B23K35/22B23K20/02B23K20/24B23K101/38H10N60/00
CPCB23K20/002B23K20/02B23K20/24B23K35/22B23K35/40
Inventor 戴少涛莫思铭蔡渊张腾马韬胡磊王邦柱陈慧娟熊旭明
Owner BEIJING JIAOTONG UNIV
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