Method for measuring torque of low temperature superconductive wire, and apparatus thereof

A low-temperature superconductivity and wire technology, which is used in measurement devices, power measurement, and analysis of materials, etc., can solve the problems of complicated shooting cross-section methods, high equipment requirements, and long measurement cycles, and can solve the problem of difficult torque detection and repeatability. Good, shorten the measurement cycle effect

Active Publication Date: 2012-12-26
西部超导材料科技股份有限公司
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Problems solved by technology

[0005] In order to avoid the deficiencies of the prior art, the present invention proposes a method and device for measuring the torque of a low-temperature superconducting wire, which solves the complexities of the current scanning electron microscope photographing section method, high equipment requirements, difficult mastery, and long measurement cycle. long wait question

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  • Method for measuring torque of low temperature superconductive wire, and apparatus thereof
  • Method for measuring torque of low temperature superconductive wire, and apparatus thereof
  • Method for measuring torque of low temperature superconductive wire, and apparatus thereof

Examples

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example 1

[0057] Example 1: Torque measurement of NbTi / Cu superconducting composite wire for ITER

[0058] See Parts II and III.

example 2

[0059] Example 2: Internal tin method Nb for ITER 3 Sn wire torque measurement

[0060] Internal tin method Nb for ITER 3 Sn wire, the wire diameter is 0.821mm, the core wire diameter is about 6μm, 3000 cores, and the design torque is between 16.1mm and 16.5mm.

[0061] Compared with NbTi / Cu composite wire, internal tin method Nb 3 Sn wire has a Nb barrier layer on the outside of the core wire. When the outer copper stable layer is corroded, this barrier layer prevents nitric acid from continuing to corrode the internal copper. Therefore, the measurement of the internal tin method Nb 3 The steps of Sn wire torque will be slightly different, as follows:

[0062] Step 1: Preparation before measurement

[0063] Corrosion of the outer copper layer of the sample: Take a section of the sample and put it into 60% nitric acid solution for corrosion. After 15 minutes, the surface copper layer is completely dissolved ( Figure 5 a). The samples were taken out and rinsed with runn...

example 3

[0073] Example 3: Webbing torque measurement for MRI

[0074] Flat tape for MRI is a kind of NbTi / Cu superconducting composite wire. Its operation steps are the same as NbTi / Cu superconducting composite wire for ITER. The measured sample size is: 1.20mm×0.75mm, the design torque is 45mm, the diameter of the core wire is 25μm, and the core wire is 630 cores.

[0075] The measured data are as follows

[0076] l=158.4mm, rotated 3 times, the dial reading is 182°, the total degree is 1262°, the calculated torque L p =45.2mm.

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Abstract

The invention relates to a method for measuring torque of a low temperature superconductive wire, and an apparatus thereof. The apparatus is characterized in that a supporting rod is a circular pipe with notches; a sliding block is embedded in the circular pipe and is slidingly connected with the supporting rod; one end of the supporting rod is provided with an angle indicating dial and a rotating knob; a through hole is arranged at the centers of the sliding block and the rotating knob; a screw for fixing to-be-measured wire are disposed at the edge of the through hole; and the size of each notch of the supporting rod is smaller than the diameter of the supporting rod. The method is simple, shortens a measuring period (about 0.5 h to 1 h for measuring one sample), and has good repeatability. By using the method for measuring the torque, efficiency of product performance detection is increased, because the method has strong operability and can be mastered by general workers through simple training; and the problem of difficult detection of the torque for low temperature superconductive wire is solved.

Description

technical field [0001] The invention belongs to the technical field of performance measurement of superconducting materials, and relates to a method and a device for measuring the torque of a low-temperature superconducting wire. Background technique [0002] with NbTi and Nb 3 Sn is the most widely used superconductor at present. It has a wide range of applications in nuclear magnetic resonance imaging (MRI), nuclear magnetic resonance spectrometer (NMR), large particle accelerators and superconducting energy storage systems (SMES), magnetic confinement nuclear fusion devices (Tokamak) and other fields. Practical superconducting wire design generally employs the method of filamentation of superconducting material and embedding in a material that is a good conductor of electricity and heat (eg, copper, aluminum, etc.) and twisting the wire before final forming. The untwisted wire is very unstable. After the current flows through a certain length, all the core wires inside ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/26G01L3/00
Inventor 高慧贤
Owner 西部超导材料科技股份有限公司
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