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A high-temperature superconducting strip immersed in liquid nitrogen pressure resistance test method and test device

A high-temperature superconducting tape, superconducting tape technology, applied in the direction of measuring device, using stable tension/pressure to test material strength, analyzing material, etc., can solve superconducting tape damage, tape fatigue resistance and The service life affects, affects the working performance and service life of the strip, etc., to achieve the effect of high safety

Active Publication Date: 2021-02-26
EASTERN SUPERCONDUCTOR SCI & TECH SUZHOU CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Superconducting strips with soldering defects may be damaged during working conditions, thus affecting the working performance and service life of the strips. Therefore, it is also necessary to detect whether there are defects in the high-temperature superconducting clad strips.
[0005] At the same time, most high-temperature superconducting clad strips may face a more complex environment in practical applications. For example, during the installation and use of superconducting strips, they will be repeatedly changed from air to liquid nitrogen, resulting in There are drastic changes in the temperature and humidity environment at the place, etc. These influencing factors will affect the fatigue resistance and service life of the strip.
[0006] However, there is no experimental method in the prior art that can simulate the influencing factors faced by the high-temperature superconducting clad strip in the working environment to detect the fatigue resistance of the high-temperature superconducting clad strip

Method used

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  • A high-temperature superconducting strip immersed in liquid nitrogen pressure resistance test method and test device
  • A high-temperature superconducting strip immersed in liquid nitrogen pressure resistance test method and test device
  • A high-temperature superconducting strip immersed in liquid nitrogen pressure resistance test method and test device

Examples

Experimental program
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Effect test

Embodiment 1

[0042] A kind of high-temperature superconducting strip liquid nitrogen immersion pressure resistance test method, refer to figure 1 , which includes the following steps:

[0043] S100, take a number of superconducting strip samples and number them, wherein the length of the superconducting strip samples is not less than the distance between two current electrodes; use flux to weld metal silver of the same width on both ends of the superconducting strip samples The current leader is used to reduce the contact resistance between the electrode and the strip, and to avoid burning near the electrode due to excessive contact resistance during the critical current experiment. The solder joints are required to have no defects such as virtual connections and bubbles; to test the superconducting strip sample For the critical current value, repeat the test three times, and take the average value and record it as lc(s1).

[0044] S200, put all superconducting tape samples into clean wat...

Embodiment 2

[0054] An experimental device applied to the above-mentioned high-temperature superconducting strip liquid nitrogen immersion pressure resistance test method, refer to Figure 2 to Figure 4 ,include:

[0055] Dewar tank 1 for carrying liquid nitrogen;

[0056] The sealing cover 2 is detachably connected with the Dewar tank 1. In this embodiment, the sealing cover 2 is connected with the Dewar tank 1 through four fastening screws 21, and a sealing ring is provided at the joint (not shown in the drawings) to improve airtightness;

[0057] The lifting device 3 arranged on the sealing cover 2, the lifting device 3 includes a lifting rod 31 extending into the Dewar tank 1, the joint between the lifting rod 31 and the sealing cover 2 is also provided with a sealing ring, and the sealing ring will be closed after the lifting rod 31 descends. Locking prevents gas from leaking out, guarantees airtightness; Lifting device 3 adopts electronic control mode in the present embodiment, bel...

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Abstract

The invention discloses a high-temperature superconducting strip soaked in liquid nitrogen and a pressure-resistant experiment method and an experimental device, which relate to the field of performance detection of high-temperature superconducting strips. The key points of the technical plan include S200, take out the superconducting tape sample after soaking in water to test its critical current value, repeat the test several times, take the average value and record lc(s2); S300, place the superconducting tape sample in the liquid In nitrogen, pressurize the sealed container and set the holding time. After the holding time is reached, release the pressure in the sealed container. After the pressure is released, remove the superconducting tape sample from the liquid nitrogen and let it stand until the superconducting tape sample returns to At room temperature, then immerse the superconducting tape sample in liquid nitrogen again, test the critical current value, repeat the test several times, take the average value and record it as lc(n). The invention can effectively simulate the influencing factors faced by the superconducting strip in the working environment to judge whether there are defects such as virtual welding gaps in the cladding of the superconducting strip, and detect the fatigue resistance and service life of the superconducting strip.

Description

technical field [0001] The invention relates to the field of performance detection of high-temperature superconducting strips, and more specifically, relates to a pressure-resistant test method and an experimental device for soaking high-temperature superconducting strips in liquid nitrogen. Background technique [0002] High-temperature superconducting materials are the second-generation superconducting technology materials. Compared with low-temperature superconducting materials, their working temperature range can be carried out under liquid nitrogen, and the test cost is low, which has the advantage of being widely used in laboratories. The critical current lc of superconducting tape is one of the most important performance indicators in applications. It is the functional layer, that is, the superconducting layer, that determines the current carrying capacity of the high-temperature superconducting material. The thickness is on the order of microns. If it is pulled by a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/00G01N3/12
CPCG01N3/12G01N27/00G01N2203/0003G01N2203/0019G01N2203/0048
Inventor 陈天博王玉山周彬熊旭明蔡渊袁文
Owner EASTERN SUPERCONDUCTOR SCI & TECH SUZHOU CO LTD