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

An in-situ method and tape technology, applied in cable/conductor manufacturing, usage of superconductor elements, superconducting devices, etc. Silk is easy to produce microcracks and other problems, to achieve the effect of improving metal fluidity, good chemical inertness, and avoiding diffusion behavior

Active Publication Date: 2010-06-09
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 tape

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0048] combine figure 2 , in this example, multi-core TiC doped MgB was prepared by in-situ method 2 When stripping, the following steps are involved:

[0049] Step 1, tube loading: First, fully mix dry magnesium powder, high-purity crystalline boron powder and nano-titanium carbide powder according to the ratio of atomic numbers of 1:1.95:0.05 to obtain a mixture, and then put the mixture into Into the Nb / Cu composite metal pipe that has been pickled in advance to obtain a pipe-loading composite; the Nb / Cu composite metal pipe is made of an inner tube made of Nb material and coaxially sleeved on the outside of the inner tube and Consists of an outer tube made of Cu material. The purity of the magnesium powder, the high-purity crystalline boron powder and the nano-titanium carbide powder are respectively 99.8%, 99.999% and 99.9%. The pickling treatment described in step 1 is pickling with a mixed acid composed of nitric acid and hydrofluoric acid, and after pickling, dehyd...

Embodiment 2

[0058] In this example, the difference from Example 1 is: when loading the tube in step 1, dry magnesium powder, high-purity crystalline boron powder and nano-titanium carbide powder are fully mixed according to the atomic number ratio of 1:1.90:0.1 The mixture is obtained; in step 302, when performing secondary swaging and drawing processing, the pass processing rate is 20%, and a 6-core composite sheathed wire rod with a diameter of Φ1.0mm is obtained; and in step 302, two After the first swaging and drawing processing, there is no need to carry out rolling treatment, but directly carry out high-temperature sintering treatment on the 6-core composite sheathed wire rod; when performing high-temperature sintering treatment in step 4, first put the 6-core composite sheathed wire rod into Fill the tubular annealing furnace with circulating pure argon, heat the 6-core composite sheathed wire at a heating rate of 30°C / min after 1.5h, keep it warm for 1.5h when the temperature rises...

Embodiment 3

[0060] 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 to the tube-loading complex described in step one successively, and obtain a circular cross-section Shaped single-core wire 1; when performing high-temperature sintering in step 4, first put the 6-core composite sheathed strip into the tubular annealing furnace, fill it with circulating pure argon, and then heat it at 60°C / min after 1.5h The heating rate is to heat the 6-core composite sheathed wire, keep it warm for 0.5h when the temperature rises to 900°C, 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.

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Abstract

The invention discloses a method for preparing multicore TiC doped with MgB2 superconductive material by in situ method, including the following steps: firstly, tabulation, dry magnesium powder, high purity crystal state boron powder and nano titanium carbide powder are fully mixed to be uniform in atom quantity ratio of 1:(2-x):x, thus obtaining a tabulation compound body, wherein x is more than or equal to 0.02 and less than or equal to 0.10; 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 TiC doped MgB 2 Preparation method of superconducting wire, especially relates to an in-situ method for preparing multi-core TiC doped MgB 2 The strip method. Background technique [0002] MgB discovered in 2001 2 Superconductors have many excellent properties, such as simple structure, large coherence length, and no weak connection between grain boundaries, so they have broad potential applications in superconducting power, electronic devices, national defense, and medical instruments (especially nuclear magnetic imaging magnets). High performance MgB 2 The preparation of wire strips is a prerequisite for large-scale applications, and it is also one of the hot spots in the research of international superconducting materials in recent years. But pure MgB 2 In the absence of effective pinning centers in superconductors, the critical current density (J c ) decays rapidly with the increase of temperature and magnetic field...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01B12/10C01B35/04
CPCY02E40/644Y02E40/60
Inventor 刘国庆闫果熊晓梅孙昱艳单迪李成山
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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