Method for preparing C-mixed multi-core MgB2 super-conduction wires through solution coating method

A technology of superconducting wires and solutions, applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc., can solve the problems of reduced performance, increased cost, abnormal growth of grains, etc., to avoid The effect of reducing superconducting performance, meeting application requirements, and improving magnetic flux pinning force

Active Publication Date: 2014-07-30
BAOSHENG SCI & TECH INNOVATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The activity of C element in the doping source directly affects the doping effect. Inorganic carbide is used as the doping source. Due to the low activity of C element, a high heat treatment temperature is required to introduce effective doping. However, if the temperature is too high, the cost will increase. , In addition

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  • Method for preparing C-mixed multi-core MgB2 super-conduction wires through solution coating method
  • Method for preparing C-mixed multi-core MgB2 super-conduction wires through solution coating method

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Effect test

Embodiment 1

[0029]Step 1: First, mix amorphous boron powder (purity above 99%) and -325 mesh spherical magnesium powder (purity 99.8%) according to the atomic number ratio of Mg:B =0.95:2. After mixing evenly, pour into the pre-configured In the oxalic acid ethanol solution, the amount of oxalic acid in the solution is 15% of the mass of the mixed powder of Mg and B, and the mass concentration of the oxalic acid solution is 15%. Stir the mixed suspension in a 200 R / min magnetic stirrer for 60 minutes, then heat the suspension while magnetically stirring, and control the temperature at 55°C until the viscosity of the suspension increases significantly, causing the magnetic stirring to When the stirrer cannot be stirred, pour the mixed slurry into a petri dish, put it into a vacuum oven and dry it at 50°C, grind the dried powder, put it into a burning boat, and carry out low-temperature decomposition treatment in a tube furnace, with 0.5 The heating rate of ℃ / min is up to 150 ℃, the tempera...

Embodiment 2

[0036] Step 1: First, mix amorphous boron powder (purity above 99%) and -325 mesh spherical magnesium powder (purity 99.8%) according to the atomic number ratio of Mg:B =0.95:2. After mixing evenly, pour into the pre-configured In the oxalic acid ethanol solution, the amount of oxalic acid in the solution is 30% of the mass of the mixed powder of Mg and B, and the mass concentration of the oxalic acid solution is 20%. Stir the mixed suspension in a 300 R / min magnetic stirrer for 30 minutes, then heat the suspension while magnetically stirring, and control the temperature at 65°C until the viscosity of the suspension increases significantly, causing the magnetic stirring to When the device cannot be stirred, pour the mixed slurry into a petri dish, put it into a vacuum oven for drying at 60°C, grind the dried powder, put it into a burning boat, and carry out low-temperature decomposition treatment in a tube furnace. The heating rate of ℃ / min is up to 200 ℃, and the temperature ...

Embodiment 3

[0043] Step 1: First, mix amorphous boron powder (purity above 99%) and -325 mesh spherical magnesium powder (purity 99.8%) according to the atomic number ratio of Mg:B =0.95:2. After mixing evenly, pour into the pre-configured In the oxalic acid ethanol solution, the amount of oxalic acid in the solution is 20% of the mass of the mixed powder of Mg and B, and the mass concentration of the oxalic acid solution is 18%. Stir the mixed suspension in a 250 R / min magnetic stirrer for 45 minutes, then heat the suspension while magnetically stirring, and control the temperature at 60°C until the viscosity of the suspension increases significantly, causing the magnetic stirring to When the device cannot be stirred, pour the mixed slurry into a petri dish, put it into a vacuum oven for drying at 55°C, grind the dried powder, put it into a burning boat, and carry out low-temperature decomposition treatment in a tube furnace. The heating rate of ℃ / min is up to 180 ℃, the temperature is k...

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Abstract

The invention discloses a method for preparing C-mixed multi-core MgB2 super-conduction wires through a solution coating method and belongs to the technical field of super-conduction wire manufacturing. A MgB2 super-conduction core wire, a metal Nb-Ti composite blocking layer, a center copper-niobium reinforcing core and an outer-coating Cu-Ni alloy layer are included. First, a solution coating technology is used for preparing a C-mixed tubing precursor powder body, then the tubing precursor powder body is placed into a Nb-Ti composite tube cleaned by acid pickling in a filling mode manually, rolling is carried out, single-core wires are formed by machining, then secondary assembling is carried out according to a seven-core conductor structure, outer-coating materials are a Cu-Ni alloy tube, a center is reinforced through a copper-niobium composite rod, a secondary composite body is subjected to a machining process with rotary swaging drawing and hole pattern rolling combined, multi-core wires are prepared, and finally after heat treatment, the high-mechanical-strength high-critical-current-density C-mixed multi-core MgB2 super-conduction wires are obtained. The wires can be used in fields such as power transmission and distribution, super-strong magnets, energy storage, power generators, transformers and medical treatment.

Description

technical field [0001] The invention relates to a method for preparing a C-doped multi-core MgB2 superconducting wire by a solution coating method, and belongs to the technical field of superconducting wire manufacturing. Background technique [0002] With the "climate warming" of the earth and the deterioration of the human living environment, the development of energy-saving, environmental protection and new energy technologies has become an inevitable choice for human beings in the 21st century; and superconducting materials, as the most important high-tech energy-saving and environmental protection materials in the 21st century It has a wide range of applications in power distribution, super magnets, energy storage, generators, transformers, maglev trains and other fields. MgB2 superconductor has the advantages of high critical temperature (Tc=39K), large coherence length, and no weak connection of grain boundary. This series of advantages makes MgB2 superconductor attra...

Claims

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Application Information

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IPC IPC(8): H01B13/00H01B12/00
CPCY02E40/60
Inventor 白质明李成山黄崇祺房权生庞玉春邹红飞徐云海
Owner BAOSHENG SCI & TECH INNOVATION
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