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Preparation method of low-cost high-density MgB2 super-conducting wire rod

A superconducting wire and dense technology, applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc., can solve the problems of low-density grain connectivity, etc., to solve holes and cracks, Effects of improving connectivity and reducing usage

Inactive Publication Date: 2018-06-08
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to improve its J c , many research groups have adopted a variety of different methods to improve the efficiency of its magnetic flux pinning, such as: element doping, particle radiation, thermal mechanical processing and magnetic material shielding, etc., these processes have greatly improved the MgB 2 Superconductor J c , the upper critical field (H c2 ) and the irreversible field (H irr ), however, theoretically, there is still much room for improvement in its superconducting current density
The less dense is MgB 2 The main limit to the improvement of die connectivity

Method used

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  • Preparation method of low-cost high-density MgB2 super-conducting wire rod
  • Preparation method of low-cost high-density MgB2 super-conducting wire rod
  • Preparation method of low-cost high-density MgB2 super-conducting wire rod

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Experimental program
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Effect test

Embodiment 1

[0027] S1. Pioneer powder tube preparation: in a vacuum glove box, B powder, MgB4 powder and graphene are uniformly mixed in a molar ratio of 0.895:0.025:0.005, wherein the purity of B powder is 99%, and the average particle size is 0.5 μm;

[0028] S2. Insert a high-purity magnesium rod with a diameter of 3mm into the center of a stainless steel tube with a diameter of 6mm and fix it. Put the uniformly mixed precursor powder in step S1 around the magnesium rod of the stainless steel tube. The filling amount is calculated according to the ratio of Mg:B=1:2 , and seal both ends of the stainless steel tube, wherein the outer diameter of the stainless steel tube is 8mm, the inner diameter is 6mm, and the purity of magnesium in the high-purity magnesium rod is 99.95%;

[0029] S3, swaging processing: take out the above-mentioned installed stainless steel pipe from the vacuum glove box, and swage it on a swaging machine to form a filament with a diameter of 3.75mm;

[0030] S4. Hea...

Embodiment 2

[0034] S1. Pioneer powder tube preparation: put B powder and MgB in a vacuum glove box 4The powder and graphene are uniformly mixed according to the molar ratio of 0.798:0.05:0.002, wherein the purity of powder B is 99%, and the average particle size is 0.5 μm;

[0035] S2. Insert a high-purity magnesium rod with a diameter of 3 mm into the center of a stainless steel tube with a diameter of 6 mm and fix it. Put the uniformly mixed precursor powder in step S1 around the magnesium rod of the stainless steel tube. The filling amount is calculated according to the ratio of Mg:B=1:2 , and seal both ends of the stainless steel tube, wherein the outer diameter of the stainless steel tube is 8mm, the inner diameter is 6mm, and the purity of magnesium in the high-purity magnesium rod is 99.95%;

[0036] S3. Swivel processing: take out the above-mentioned installed stainless steel pipe from the vacuum glove box, and swage it on a swaging machine to form a filament with a diameter of 1....

Embodiment 3

[0041] S1. Pioneer powder tube preparation: put B powder and MgB in a vacuum glove box 4 The powder and graphene are uniformly mixed according to the molar ratio of 0.69:0.075:0.01, wherein the purity of powder B is 99%, and the average particle size is 0.5 μm;

[0042] S2. Then insert a high-purity magnesium rod with a diameter of 3 mm into the center of a stainless steel tube with a diameter of 6 mm and fix it. Put the uniformly mixed precursor powder in step S1 around the magnesium rod of the stainless steel tube. The filling amount is in the ratio of Mg:B=1:2 Calculate and seal both ends of the stainless steel pipe, wherein the outer diameter of the stainless steel pipe is 8mm, the inner diameter is 6mm, and the purity of magnesium in the high-purity magnesium rod is 99.95%;

[0043] S3, swaging processing: take out the above-mentioned installed stainless steel pipe from the vacuum glove box, and swage it on a swaging machine to form a filament with a diameter of 2.65 mm; ...

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Abstract

The invention discloses a preparation method of a low-cost high-density MgB2 super-conducting wire rod. The preparation method comprises the following steps: firstly preparing precursor powder in tube, and then inserting a high-purity magnesium rod into the center of a stainless steel tube to fix, filling the precursor powder around the magnesium rod of the stainless steel tube, taking out the assembled stainless steel tube, processing the stainless steel tube in a rotary swaging into filaments on a rotary swaging machine, and then placing the prepared wire rods into a tubular furnace for circulating argon gas to heat to obtain the MgB2 super-conducting wire rod. The MgB2 super-conducting wire rod prepared through the preparation method is high in purity, high in density, simple in step, easy to operate and high in practical value.

Description

technical field [0001] The invention belongs to the technical field of preparation of superconducting materials, in particular to a low-cost and high-density MgB 2 Preparation method of superconducting wire. Background technique [0002] Among the various superconducting materials that can be applied today, the medium temperature superconducting material MgB 2 Compared with low-temperature superconducting materials, the application temperature range of 20 to 30K can be realized by a refrigerator, which gets rid of the limitation of liquid helium cooling. Compared with oxide high-temperature superconductors, MgB 2 It has a very simple chemical composition and crystal structure, and the grain boundary can carry a high current; it is easy to prepare and the cost is low; at the same time, MgB 2 Compared with perovskite-type oxide superconductors, it has a larger coherence length, which means that MgB 2 It is easier to introduce an effective flux pinning center in it and impr...

Claims

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Application Information

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IPC IPC(8): H01B13/00H01B12/00
CPCH01B12/00H01B13/0006Y02E40/60
Inventor 张红李磊王其赵勇张勇
Owner SOUTHWEST JIAOTONG UNIV
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