MgB2 superconducting cable joint and preparation and connection method thereof

A superconducting cable and superconducting technology, which are applied in the manufacturing of contacts, connecting contact materials, connecting/disconnecting of connecting devices, etc., can solve problems such as cable length limitation, reduce AC loss, simple manufacturing method, low AC The effect of loss

Active Publication Date: 2021-06-25
西部超导材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But MgB 2 The length of the cable is still limited by the length of a single wire

Method used

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  • MgB2 superconducting cable joint and preparation and connection method thereof
  • MgB2 superconducting cable joint and preparation and connection method thereof
  • MgB2 superconducting cable joint and preparation and connection method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The number of strands of the two superconducting cables to be connected is 3 strands, and all of them are superconducting strands. The specific implementation process is:

[0027] (1) In a vacuum glove box, fix the Mg rod in the middle of the Nb / Cu composite tube, and put the amorphous B powder into the gap between the Mg rod or the outside of the Mg tube and the Nb / Cu composite tube to obtain a Composite body; the atomic ratio of the Mg rod to the loaded B powder is 0.48-1. The outermost layer of the primary complex is Cu;

[0028] (2) Using 30% of the pass processing amount, the primary complex is drawn in multiple passes to a diameter of Φ5mm, and a 100mm length is cut off as a preform for making a superconducting joint. The specifications of each component in the cross section of the preform are determined by the center The areas outward are: the Mg area in the central area occupies the central area Φ2mm, the ring structure occupied by the B ring area is about Φ3....

Embodiment 2

[0037] The strands of the two superconducting cables to be connected are 3 strands and 4 strands respectively, and all of them are superconducting strands. The specific implementation process is:

[0038] (1) In a vacuum glove box, fix the Mg rod in the middle of the Nb / Cu composite tube, and put the amorphous B powder into the niobium-copper composite tube with the Mg rod in the middle to obtain a primary composite; the Mg rod and the filling The atomic ratio of the B powder is 0.48-1. The outermost layer of the primary complex is Cu;

[0039] (2) Using 20% ​​of the pass processing amount, the primary complex is drawn in multiple passes to a diameter of Φ20mm, and the length of 200mm is intercepted as a preform for making a superconducting joint. The specifications of each component in the cross section of the preform are given by Outward from the central area are: the central area occupied by the Mg area is Φ8mm, the ring structure occupied by the B ring area is about Φ14×...

Embodiment 3

[0048] The number of strands of the two superconducting cables to be connected is 7 strands, and its structure is that 6 superconducting strands are evenly surrounded by 1 copper wire. The specific implementation process is:

[0049] (1) In the vacuum glove box, the Mg tube is fixed in the middle of the Nb / Cu composite tube, and the amorphous B powder is packed into the gap between the outside of the Mg tube and the Nb / Cu composite tube to obtain a primary complex; the Mg tube The atomic ratio to the loaded B powder is 0.48-1. The outermost layer of the primary complex is Cu;

[0050] (2) Using 10% of the pass processing amount, the primary complex is swaged or drawn to a diameter of Φ16mm, and a 100mm length is cut off as a preform for making a superconducting joint. The specifications to the outside are: the central area occupied by the Mg tube is a ring structure of about Φ8×4mm, the area occupied by the B ring area is about Φ12×8mm, and the area occupied by the Nb ring a...

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Abstract

The invention discloses a MgB2 superconducting cable joint. The MgB2 superconducting cable joint is of a round rod-shaped structure, the cross section structure of the MgB2 superconducting cable joint is that a central area is an Mg area, the central area is solid or hollow, and a B ring area, an Nb ring area and a Cu ring area which are of an annular structure are sequentially arranged around the periphery of the Mg area from the center to the outside; a plurality of connecting holes are formed in the B ring areas at the two ends of the MgB2 superconducting cable joint, the number of the connecting holes in each end face of the MgB2 superconducting cable joint is the same as the number of superconducting strands of the MgB2 superconducting cable needing to be connected to the end face, and the connecting holes are evenly distributed around the outer side of the Mg area. The invention also provides a preparation method and a connection method of the MgB2 superconducting cable joint. The superconducting cable joint disclosed by the invention has relatively high transportation performance. And the connected cable keeps a multi-strand structure and can be twisted for the second time, so that the alternating current loss of the superconducting cable joint is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of preparation of superconducting materials, in particular to a MgB 2 Superconducting cable joint structure, preparation method and connection method with superconducting strands. Background technique [0002] Magnesium diboride has a simple structure and has attracted great enthusiasm from research teams around the world since the discovery of superconductivity in it in 2001. With the development of refrigeration technology, direct cooling of refrigerators or even liquid hydrogen refrigeration devices can be used to realize the application of magnesium boride at 10K ~ 20K, avoiding the complicated, scarce and expensive liquid helium conditions. Therefore, magnesium boride at 4.2 Competitive in superconducting applications above K. [0003] At present, many companies have used the powder-in-tube method (PIT) to prepare kilometer-level MgB in batches. 2 superconducting wire. On this basis, many teams have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01R4/68H01R43/16H01R43/26
CPCH01R4/68H01R43/16H01R43/26Y02E40/60
Inventor 王大友侯艳荣闫果陈传李超张平祥冯勇刘向宏李金山
Owner 西部超导材料科技股份有限公司
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