MgB2 superconducting wire and manufacturing method thereof

A manufacturing method and superconducting wire technology, which are applied in cable/conductor manufacturing, usage of superconducting elements, superconducting devices, etc., to achieve low-cost preparation, strengthen grain connection, and improve the effects of magnetic flux pinning

Active Publication Date: 2013-03-20
LIYANG CITY PRODIVITY PROMOTION CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zr, Mo, Nb, W, Ti, Al, Fe, WSi that have been tested 2 , ZrSi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] The preparation steps of the superconducting wire include:

[0019] (1) First, the dry magnesium, boron, hafnium and silicon powders are thoroughly mixed for 1-3 hours according to the atomic ratio Mg:Hf:B:Si = 1-x:x:2-x:x, where 0.05≤ x≤0.20;

[0020] (2) Load the mixed powder into a seamless low-silicon steel pipe or a niobium tube, and then load the composite into an oxygen-free copper tube to assemble a composite;

[0021] (3) The composite body is subjected to room temperature cold working process, and is processed into a wire rod through the comprehensive use of three processing techniques of rotary forging, pass rolling and drawing, and the final cross-sectional shape of the wire rod is circular;

[0022] (4) Place the wire rod processed to the final size and shape in a vacuum annealing furnace, vacuumize at room temperature, and wait until the vacuum degree reaches 10 -3 After Pa is filled with pure argon or a mixture of argon and hydrogen, then the wire is h...

Example Embodiment

[0025] Example 1

[0026] The dry powders of magnesium (99%), boron (99%), hafnium (99%) and silicon (99%) were thoroughly mixed according to the atomic ratio Mg:Hf:B:Si=0.95:0.05:1.95:0.05 1 Hour. Put the ground powder into a 0.9-meter-long low-silicon steel pipe (inner diameter 10mm, wall thickness 1.5mm), so that the powder is filled and tight in the pipe, then close both ends of the steel pipe, and then put the steel pipe into a 1-meter-long oxygen-free steel pipe. copper tube (inner diameter 13.5mm, wall thickness 2mm). Then, the assembled composite body was swaging, and processed to a diameter of 7 mm at a pass rate of 0.5 mm per pass. Then, pass rolling is carried out, and it is processed into a square line with a side length of 3 mm at a processing rate of 1.0 mm per pass. The square wire is processed into a wire rod with a diameter of 1.2 mm and a length of 50 meters according to the processing rate of 0.2 mm per pass. Place the processed wire in a vacuum annealin...

Example Embodiment

[0027] Example 2

[0028] The dry powders of magnesium (99%), boron (99%), hafnium (99%) and silicon (99%) were thoroughly mixed according to the atomic ratio Mg:Hf:B:Si=0.9:0.1:1.9:0.1 1 Hour. Put the ground powder into a 0.9-meter-long low-silicon steel pipe (inner diameter 10mm, wall thickness 1.5mm), so that the powder is filled and tight in the pipe, then close both ends of the steel pipe, and then put the steel pipe into a 1-meter-long oxygen-free steel pipe. copper tube (inner diameter 13.5mm, wall thickness 2mm). Then, the assembled composite body was swaging, and processed to a diameter of 7 mm at a pass rate of 0.5 mm per pass. Then, pass rolling is carried out, and it is processed into a square line with a side length of 3 mm at a processing rate of 1.0 mm per pass. The square wire is processed into a wire rod with a diameter of 1.2 mm and a length of 50 meters according to the processing rate of 0.2 mm per pass. Place the processed wire in a vacuum annealing fu...

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PUM

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Abstract

The utility model discloses a manufacturing method of an MgB2 superconducting wire, comprising the following steps: intensively mixing dry powder of magnesium, boron, hafnium and silicon for 1-3 hours according to an atomic ratio of Mg, Hf, B to Si of 1-x, x, 2-x to x, wherein x is larger than or equal to 0.05 and smaller than or equal to 0.20; loading the mixed powder in a seamless low-silicon steel tube or niobium tube, and then loading the complex in an oxygen-free copper tube to assemble another complex; processing the complex into wire bars at room temperature through the comprehensive use of three technologies of swaging, groove rolling and drawing; placing the wire bars in a vacuum annealing furnace, charging pure argon or gas mixture of argon and hydrogen after vacuumizing till 10 to the power of -3 under room temperature, and then heating till the temperature of 740-760 DEG C at a speed of no less than 60 DEG C per minute and keeping warm for 1-10 hours; and cooling till room temperature at a speed of no less than 25 DEG C per minute so that the MgB2-based superconducting wire with a round cross section is manufactured. The method is simple in preparation process and is suitable for producing and manufacturing the MgB2-based superconducting wire with high critical current density in a background magnetic field of more than 3T in large scale.

Description

technical field [0001] The invention relates to a superconducting material and a preparation method thereof. Background technique [0002] Magnesium diboride (MgB 2 ) is the intermetallic compound superconducting material with the highest critical transition temperature at present, and its critical transition temperature (39-40K) is higher than that of Nb which has been practically applied so far. 3 Superconducting materials such as Sn and NbTi. The advantages of high transition temperature, large coherence length, high upper critical field, no weak connection at grain boundary, simple structure and low cost make MgB 2 Become the most powerful competitor for materials used in the 20K-30K temperature range. [0003] Especially in the field of low field, such as in magnetic resonance imaging magnet applications, MgB 2 showed a great advantage, and data have shown that MgB 2 The practical application will bring billions of economic benefits, and because it can work under t...

Claims

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Application Information

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IPC IPC(8): H01B12/00H01B13/00
CPCY02E40/64Y02E40/60
Inventor 张俊王斌陈丽
Owner LIYANG CITY PRODIVITY PROMOTION CENT
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