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Method for manufacturing large-scale MgB2 single-core superconducting wire

A superconducting wire, large-scale technology, applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc., can solve the problems affecting the ability of wires to conduct electricity, small area ratio, high equipment requirements, etc., to achieve Increased density, improved superconductivity, and the effect of removing processing deformation stress

Inactive Publication Date: 2014-07-16
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Yamada et al. reported a method of preparing MgB by powder casing method. 2 The method of superconducting wire (Y.Yamada, M.Kanazawa, T.Ohno et al.PIT Processed MgB 2 Thin Wires Sheathed With Stainless Steel[J].IEEE Transactions on Applied Superconductivity,2012,22(3)), the diameter of the wire prepared by this method reaches 0.1mm~0.2mm, but the MgB of the wire 2 The proportion of the area occupied by the powder core is small, only 24% to 26%, which affects the actual conductivity of the wire; at the same time, the precursor powder used is MgH 2 and B powder, it needs to be kept at 630°C for 5 hours in an argon-filled environment to synthesize MgB 2 Superconducting phase, high requirements on equipment, long preparation period

Method used

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  • Method for manufacturing large-scale MgB2 single-core superconducting wire
  • Method for manufacturing large-scale MgB2 single-core superconducting wire
  • Method for manufacturing large-scale MgB2 single-core superconducting wire

Examples

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preparation example Construction

[0026]A large-scale MgB 2 The preparation method of single-core superconducting wire, its technical scheme comprises the following steps:

[0027] Step 1. Clean the low carbon steel pipe with 9%-10% dilute hydrochloric acid, and conduct passivation treatment with 12%-14% sodium nitrite.

[0028] Step 2. Put Mg powder and B powder with a molar ratio of 1.1:2 into the ball mill in a glove box filled with argon, and put the grinding balls into the ball mill according to the ratio of material / ball mass ratio of 1:3 to 5. The ball mill jar containing the raw material powder and grinding balls is milled for 3h to 5h, and the ball mill is stopped for 10min to 15min every 1h.

[0029] Step 3: Put the ball-milled uniform and fine raw material powder into a low carbon steel pipe with an outer diameter of 14mm-20mm and a wall thickness of 2.5mm-3mm, vibrate with a vibrating device and compact with a tamper, and seal both ends. In this way, the density of the mixed powder can be increas...

Embodiment 1

[0040] Large-scale MgB of this embodiment 2 The preparation method of the single-core superconducting wire is as follows:

[0041] Step 1: Clean the low carbon steel pipe with an outer diameter of 14mm, an inner diameter of 8mm and a length of 4000mm with 9% dilute hydrochloric acid and passivation treatment with 12% sodium nitrite.

[0042] Step 2, using atomized Mg powder with a purity of 98wt% and an average particle size of 5μm and amorphous B powder with a purity of 95wt% and an average particle size of 0.4μm, in an argon-filled glove box, the molar ratio is 1.1: 2 of Mg powder and B powder are put into the ball mill tank, the grinding balls are also put into the ball mill tank according to the ratio of material / ball mass ratio of 1:3, and the ball mill tank containing the raw powder and the grinding balls is ball-milled for 3 hours, and each ball is milled. 1h stop 15min.

[0043] Step 3: Put the uniform and fine raw material powder after ball milling into the washed l...

Embodiment 2

[0051] Large-scale MgB of this embodiment 2 The preparation method of the single-core superconducting wire is as follows:

[0052] Step 1. Clean the low carbon steel pipe with an outer diameter of 20mm, an inner diameter of 14mm and a length of 5000mm with 10% dilute hydrochloric acid, and passivated with 14% sodium nitrite.

[0053] Step 2: Using atomized Mg powder with a purity of 99.83 wt% and an average particle size of 25 μm, and amorphous B powder with a purity of 97 wt% and an average particle size of 0.6 μm, in an argon-filled glove box, the molar ratio is 1.1:2 Mg powder and B powder are put into the ball mill, and the grinding balls are also put into the ball mill at the ratio of material / ball mass ratio of 1:5. The ball mill is stopped for 10min every 1h.

[0054] Step 3: Put the uniform and fine raw material powder after ball milling into the washed low carbon steel pipe, vibrate with a vibration device at a vibration frequency of 20Hz, and compact it with a tamp...

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Abstract

The invention relates to a method for manufacturing a large-scale MgB2 single-core superconducting wire. According to the method, Mg powder and B powder are used as raw materials, a low-carbon steel pipe with a certain specification is cleaned, the Mg powder and the B powder are placed in a ball-milling tank in a glove box filled with argon according to a molar ratio of 1.1:2, a certain number of mill balls are added for ball milling, the cleaned low-carbon steel pipe is then filled with the evenly mixed raw powder, vibration is conducted with a vibration device and the raw powder is compacted with a tamper, the opening is sealed, and then a wire with Mg and B mix powder wrapped in low-carbon steel with a certain diameter and length is obtained through rotary swaging, drawing and intermediate annealing; the MgB2 single-core superconducting wire can be obtained after the wire is sintered under 800 DEG C - 900 DEG C for 10 min - 20 min. Large-scale MgB2 single-core superconducting wires with diameters ranging from 0.95 mm to 1.05 mm and lengths of 1000 m can be manufactured with the method, and the wires have a good electrical property and mechanical property.

Description

technical field [0001] The present invention relates to a large-scale MgB 2 Preparation method of superconducting wire. Background technique [0002] Magnesium Diboride (MgB 2 ) superconducting material was discovered in 2001. As a superconductor, its conduction mechanism can be explained by BCS theory, and its coherence length is 5 nm. Compared with high temperature superconducting materials (HTS), MgB 2 There is no weak connection effect, that is, most of the grain boundaries can pass the current, and MgB with high current density can be prepared by mature technology (such as powder casing method PIT technology). 2 Superconducting wire; relative to low temperature superconducting material (LTS), the critical transition temperature of 39K can be achieved by refrigeration technology without using expensive liquid helium, making MgB 2 It has greater reliability and feasibility in practical applications. MgB 2 Superconducting materials have broad application prospects in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01B12/04
CPCY02E40/60
Inventor 余新泉潘徐杰张逸芳周良帅张友法吴建新
Owner SOUTHEAST UNIV
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