Superconductive joint and preparation method thereof

A superconducting joint and superconducting technology, applied in the direction of connecting contact materials, etc., can solve the problems of poor grain connectivity, etc., and achieve the effects of increased density, good grain connectivity, and simple preparation process

Inactive Publication Date: 2018-03-30
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of poor grain connectivity when magnesium diboride is used as the contact material in current superconducting joints, to propose a method for preparing a superconducting joint with high density and grain connectivity, and to prepare a connection efficiency Higher superconducting joints

Method used

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  • Superconductive joint and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Grind the ends of the two magnesium diboride single-core wires that need to be connected to expose the superconducting core. according to figure 1 The connection method shown is to insert the ends of the above-mentioned two magnesium diboride wires into the niobium sheath, then fill the boron powder and make the density reach 50% of the theoretical density, cover the surface of the boron powder with magnesium powder, magnesium powder The atomic ratio with boron powder is 1:2. After the niobium sheath is welded, it is heat treated at 650°C and kept for 5 hours. The entire process of preparing superconducting joints is completed in air. After testing, the superconducting joint prepared in this embodiment has a joint resistance of less than 10 at 4.2K and self-field. -14 Ω, the joint connection efficiency reached 99.7%.

[0028] Embodiments 2-9 have the same preparation process as the above-mentioned embodiment 1, the difference is the type of superconductor to be conn...

Embodiment 223

[0047] The ends of the two iron-based superconducting strips to be connected are ground to expose the superconducting core. according to figure 1 The connection method shown is to insert the ends of the two iron-based superconducting strips treated above into the iron / copper composite sheath, then fill the boron powder and make the density reach 50% of the theoretical density, and cover the surface of the boron powder with magnesium Powder, the atomic ratio of magnesium powder and boron powder is 1:2. After the iron / copper composite sheath is welded, it is heat-treated at 600°C and kept for 20 hours. The entire process of preparing superconducting joints is completed in air.

[0048] Embodiments 224-264 have the same preparation process as the above-mentioned embodiment 223, the difference is the type of metal sheath and its material, see the following table for details:

[0049]

[0050]

[0051]

Embodiment 265

[0053] Grind the ends of the two iron-based superconducting 3-core wires to be connected so that the superconducting cores are exposed. according to figure 1 The connection method shown is to insert the ends of the above-mentioned treated two iron-based superconducting 3-core wires into the iron / Monel composite sheath, and then fill the boron powder with a density of 60% of the theoretical density, covering the surface of the boron powder Magnesium powder, the atomic ratio of magnesium powder to boron powder is 1:2. After the iron / Monel composite sheath is welded, it is heat treated at 850°C and kept for 30 minutes. The entire process of preparing superconducting joints is completed in an argon atmosphere. After testing, the superconducting joint prepared in this embodiment has a joint resistance of less than 10 at 4.2K and self-field. -13 Ω, the joint connection efficiency reached 98%.

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Abstract

Provided is a superconductive joint, which comprises superconductors, boron powders, magnesium powders and a metal sleeve. The tail ends of the connected superconductors are buried in the boron powders; the surface of the boron powders is covered by the magnesium powders; and the connected superconductors, the boron powders and the magnesium powders are wrapped by the metal sleeve. The preparationmethod of the superconductive joint comprises the following steps: 1) polishing the tail ends of the connected superconductors to expose superconducting cores; 2) burying the tail ends of the processed superconductors into the boron powders, covering the magnesium powders on the surface of the boron powders, and wrapping the connected superconductors, the boron powders and the magnesium powders with the metal sleeve; 3) welding the metal sleeve processed in the step 2); and 4) carrying out heating processing on the metal sleeve prepared in the step 3).

Description

technical field [0001] The invention relates to a superconducting joint and a preparation method thereof. Background technique [0002] In 2001, he discovered a new type of superconductor, MgB, with a superconducting transition temperature as high as 39K. 2 It has the advantages of long superconducting coherence length, high upper critical field, no weak connection in grain boundaries, simple structure, and low cost. It has great potential in superconducting power, electronic devices, and medical instruments, especially nuclear magnetic imaging magnets Wide application prospects; In addition, the above characteristics also make magnesium diboride can also be used as a contact material for superconducting joints. At present, there are two types of superconducting joint preparation methods using magnesium diboride as the contact material. One is to directly use magnesium diboride powder as the contact material, and the other is to sinter the mixed boron powder and magnesium p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01R4/68
CPCH01R4/68
Inventor 王栋樑马衍伟张现平
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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