Method for preparing multicore C doped with MgB2 superconductive material by in situ method

A superconducting wire, in-situ technology, applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc. Problems such as micro-cracks are generated, and the effects of reasonable preparation design, good chemical inertness, and increased critical current density are achieved.

Inactive Publication Date: 2010-06-09
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

The process of preposition method is simple, but in the process of drawing, MgB 2 The core wire is prone to microcracks, and it is difficult to bridge them by heat treatment, so it is difficult to prepare MgB with high critical current density with application value 2 superconducting wire; and MgB prepared by in situ method 2 The superconducting wire can bridge the microcracks formed in the process of processing through subsequent heat treatment, and improve the MgB 2 Inter-die connectivity, which can ultimately carry higher current densities

Method used

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  • Method for preparing multicore C doped with MgB2 superconductive material by in situ method
  • Method for preparing multicore C doped with MgB2 superconductive material by in situ method
  • Method for preparing multicore C doped with MgB2 superconductive material by in situ method

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Embodiment 1

[0043] combine figure 2 , in this example, the multi-core C-doped MgB was prepared by in-situ method 2 When superconducting wire rods, the following steps are included:

[0044] Step 1, tube loading: First, fully mix dry magnesium powder, amorphous boron powder and amorphous carbon powder or nano-carbon powder according to the atomic number ratio of 1:1.95:0.05 to obtain the mixture; after that, The mixed material is put into the pre-acid-washed Nb metal pipe, and an oxygen-free copper pipe is placed on the outside of the Nb metal pipe to obtain a pipe-packing composite.

[0045] When carrying out pickling treatment in this step, carry out pickling to oxygen-free copper pipe one with dilute nitric acid, carry out pickling to Nb metal pipe adopting the mixed acid of nitric acid and hydrofluoric acid to form, all carry out dehydration and drying with alcohol after pickling and the purity of the magnesium powder and the amorphous boron powder is 99%.

[0046] Step 2, swaging ...

Embodiment 2

[0052] combine image 3 , in this embodiment, the difference from embodiment 1 is that in step two, a swaging machine and a drawing machine are used to carry out swaging and drawing treatment on the tube-loading complex described in step one successively, and obtain a cross-section of positive six A single-core wire 1 that is square and has a vertical width across sides of Φ3.0 mm. When carrying out high-temperature sintering treatment in step 4, first put the 6-core composite sheathed wire into the tubular annealing furnace, fill it with circulating pure argon, and after 2 hours, put the 6-core composite sheathed wire at a heating rate of 50°C / min Heating, when the temperature rises to 900°C, keep it warm for 1.0h, and finally cool the wire to room temperature at a cooling rate of 45°C / min. In this embodiment, the rest of the process steps, process parameters and preparation process are the same as in Example 1.

Embodiment 3

[0054] combine Figure 4 , in this embodiment, the difference from Example 1 is that in step 1, dry magnesium powder, amorphous boron powder and amorphous carbon powder or nano carbon powder are fully mixed according to the ratio of atomic number of 1: 1.90: 0.1 Evenly, the mixture is obtained; in step 301, the cleaned 12 single-core wires 1 are arranged in a circular structure along the circumferential direction and assembled into an oxygen-free copper tube 2, and at the same time inserted inside the circular structure After entering the oxygen-free copper rod 3, a 12-core composite sheathed tube is obtained; correspondingly, after the secondary swaging and drawing processing in step 302, a 12-core composite sheathed wire with a diameter of Φ1.0mm is obtained; step 4 When carrying out high-temperature sintering treatment in the middle, first put the 12-core composite sheathed wire into the tubular annealing furnace, fill it with circulating pure argon, and heat the 12-core co...

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Abstract

The invention discloses a method for preparing multicore C doped with MgB2 superconductive material by in situ method, including the following steps: firstly, tabulation, dry magnesium powder, amorphous boron powder and amorphous carbon powder or nano carbon powder are fully mixed to be uniform and then packed into Nb metal tube subject to acid cleaning, and then an oxygen-free copper tube is sheathed outside the Nb metal tube, thus obtaining a tabulation compound body; secondly, rotary swaging and drawing processing are carried out to obtain single core wire rod; thirdly, secondary packaging and rotary swaging and drawing processing are carried out to obtain multicore compound sheathed wire rod in designed dimension; fourthly, high temperature sintering is carried out. The invention is reasonable in design, simple in technological step and convenient to realize, is applicable to preparing MgB2 superconductive wire rod with high critical current density in any length, reaction between superconducting phase and sheathed material is greatly reduced, and the critical current density is higher.

Description

technical field [0001] The invention relates to a C-doped MgB 2 Preparation method of superconducting wire, especially relates to an in-situ method for preparing multi-core C-doped MgB 2 method of superconducting wires. Background technique [0002] MgB 2 The superconducting transition temperature of the superconductor is as high as 39K, which fills the blank of the medium temperature superconductor, and is a new type of superconducting material with great application potential in the working range of GM refrigerators (10-30K). Compared with oxide high temperature superconducting materials, MgB 2 The crystal structure of MgB is simpler, the coherence length is larger, there is no weak connection of grain boundary, and it can carry a high current density, but the MgB 2 There is a lack of effective pinning centers in superconductors, and the critical current density (Jc) decays rapidly with the increase of temperature and magnetic field. A large number of research results ...

Claims

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Application Information

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IPC IPC(8): H01B13/00H01B12/10C04B35/58C04B35/622
CPCY02E40/644Y02E40/60
Inventor 刘国庆闫果焦高峰王庆阳冯勇李成山
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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