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Method for preparing high-critical-current Nb3Sn superconducting strand in outer blocking manner

A niobium-three-tin, high-criticality technology, applied in the field of three-tin superconducting strands, can solve the problems of RRR reduction of superconducting wires, copper matrix pollution, etc., and achieve the effect of increasing the critical current level

Inactive Publication Date: 2019-12-17
西部超导材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing high critical current niobium-three-tin superconducting strands in an external barrier mode, to solve the problem that the Nb barrier layer reacts with Sn to cause contamination of the copper substrate and reduce the RRR of the superconducting wire. Specifically, remove Instead of a reactive Nb barrier layer, a non-reactive Ta barrier layer was added outside the subcomponent

Method used

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  • Method for preparing high-critical-current Nb3Sn superconducting strand in outer blocking manner

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Experimental program
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Effect test

Embodiment 1

[0031] Step 1: Drill evenly distributed through holes on the oxygen-free copper ingot by the deep hole drilling method, insert the Nb rod into the drilled copper ingot, the cross-sectional area of ​​the Nb rod accounts for 40% of the total cross-sectional area of ​​the CuNb composite ingot; the center of the composite ingot The area is not drilled, the cross-sectional area of ​​oxygen-free copper in the central area accounts for 20% of the total cross-sectional area of ​​the CuNb composite ingot, copper caps are added to both ends, and CuNb composite rods are obtained by welding and hot extrusion;

[0032] Step 2: Remove the central copper from the CuNb composite rod obtained in step 1 to obtain a CuNb composite tube. The cross-sectional area of ​​the removed central copper accounts for 15% of the total cross-sectional area of ​​the CuNb composite rod; insert the pure Sn rod into the CuNb composite tube, and draw After pulling out to a circle, cut to length to obtain subcompone...

Embodiment 2

[0036] Step 1: Put the Nb rod into the small hexagonal copper tube, stack and place the hexagonal oxygen-free copper rod in the oxygen-free copper sheath to obtain the CuNb composite ingot, wherein the cross-sectional area of ​​the Nb rod accounts for the total cross-sectional area of ​​the CuNb composite ingot The central area of ​​the composite ingot is stacked by hexagonal oxygen-free copper rods. The cross-sectional area of ​​the copper rods accounts for 30% of the total cross-sectional area of ​​the CuNb composite ingot. Copper caps are added to both ends of the composite ingot, and CuNb composite is obtained by welding and hot extrusion. Great;

[0037] Step 2: Remove the central copper from the CuNb composite rod obtained in step 1 to obtain a CuNb composite tube. The cross-sectional area of ​​the removed central copper accounts for 20% of the total cross-sectional area of ​​the CuNb composite rod; the mass fraction containing Ti is 1%. The SnTi alloy rod is inserted in...

Embodiment 3

[0041] Step 1: Electroplate oxygen-free copper on the surface of the Nb rod to obtain a CuNb single core rod. Stack the CuNb single core rod and the hexagonal oxygen-free copper rod in the oxygen-free copper sheath. The cross-sectional area of ​​Nb in the CuNb single core rod accounts for 65% of the total cross-sectional area of ​​the composite ingot; the central area of ​​the composite ingot is stacked by hexagonal oxygen-free copper rods, and the cross-sectional area of ​​the copper rods accounts for 35% of the total cross-sectional area of ​​the CuNb composite ingot. Extruded to obtain CuNb composite rod;

[0042] Step 2: Remove the central copper from the CuNb composite rod obtained in step 1 to obtain a CuNb composite tube. The cross-sectional area of ​​the removed central copper accounts for 30% of the total cross-sectional area of ​​the CuNb composite rod; the mass fraction containing Cu is 3% SnCu The alloy rod is inserted into the CuNb composite tube, drawn to a circu...

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Abstract

The invention discloses a method for preparing a high-critical-current Nb3Sn superconducting strand in an outer blocking manner. The method comprises the steps: inserting Nb rods into a copper ingot with drilled holes or closely arranging CuNb rods and combining the CuNb rods with a copper matrix to obtain a CuNb composite ingot, adding copper covers to the two ends of the composite ingot, and carrying out welding and hot extrusion to obtain a CuNb composite rod; removing the copper in the center of the CuNb composite rod, inserting the Sn alloy rod into the CuNb composite rod, and after drawing, carrying out fixed-size cutting to obtain sub-components; and arranging the sub-components according to layers and then, bundling and assembling the sub-components into a Ta tube, then, putting the Ta tube into an oxygen-free copper tube to obtain a triniobium tin (Nb3Sn) superconducting strand blank, and performing multi-pass drawing to obtain the high-critical-current Nb3Sn superconducting strand. The method solves the problem that the strand RRR is reduced due to the fact that Sn penetrates through a Nb barrier layer, and meanwhile, can further increase the content of Nb and Sn in the strand by adding a Ta barrier layer, so that the critical current level of the strand is improved.

Description

technical field [0001] The invention relates to the technical field of superconducting material processing, in particular to a method for preparing high critical current niobium-three-tin superconducting strands in an external barrier manner. Background technique [0002] Residual resistance ratio (RRR) is an important performance index of superconducting strands. The copper matrix in the strands plays a stabilizing role in the superconductor. When the superconductor is partially "quenched" for some reason during use, it can Bypass most of the current to make the superconductor heat up due to the increase in resistance, which can quickly dissipate the generated heat to the surrounding liquid helium, reduce the temperature of the superconductor to below the critical temperature, and restore the superconducting state. For Nb3Sn superconducting strands, long-term heat treatment is required to ensure the diffusion of Sn and the full reaction of Nb and Sn, so as to generate Nb3Sn...

Claims

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Application Information

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IPC IPC(8): H01B13/00H01B12/10
CPCH01B12/10H01B13/00H01B13/0006Y02E40/60
Inventor 张平祥史一功武博刘建伟郭强张科李建峰刘向宏冯勇
Owner 西部超导材料科技股份有限公司