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A high critical current density nb 3 The preparation method of sn superconducting wire rod

A superconducting wire, current density technology, applied in cable/conductor manufacturing, usage of superconducting elements, superconducting devices, etc., can solve the problems of affecting the current carrying capacity of the wire, the insufficient response of the core wire, etc., and achieve low hysteresis. Effects of loss, Jc increase, and critical current density increase

Active Publication Date: 2017-03-22
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

[0004] The object of the invention is to provide a high critical current density Nb 3 The preparation method of Sn superconducting wire rod, solves existing Nb 3 The Sn superconducting wire preparation method has the problem that the core wire does not fully react after heat treatment because the outer core wire is far away from the Sn source during the heat treatment process, thereby affecting the current carrying capacity of the wire.

Method used

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  • A high critical current density nb <sub>3</sub> The preparation method of sn superconducting wire rod

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preparation example Construction

[0026] A kind of high critical current density Nb of the present invention 3 The preparation method of Sn superconducting wire specifically comprises the following steps:

[0027] Step 1: Select an oxygen-free copper ingot with a diameter of 200-300mm and a length of 500-800mm as the ingot, and use the method of deep hole drilling to drill 4-5 layers evenly distributed along the length of the ingot. A total of 100-250 ingots with a diameter of 9-15mm through holes to obtain porous copper ingots;

[0028] Step 2: For the porous copper ingot obtained in step 1, first use a metal cleaner to remove surface oil, then use a nitric acid solution with a volume concentration of 25% to 40% to clean the inner hole and surface, and insert the cleaned Nb rod into the cleaned porous copper ingot. In the through hole of the copper ingot, add a copper cover to both ends of the porous copper ingot and seal it with an electron beam. The sealing welding current is 50-150mA, and the vacuum degre...

Embodiment 1

[0034] Step 1: Select an oxygen-free copper ingot with a diameter of 200mm and a length of 600mm as the ingot, and use the method of deep hole drilling to drill a total of 100 through holes with a diameter of 9mm evenly distributed in 4 layers along the length of the ingot to obtain porous copper. ingot;

[0035] Step 2: For the porous copper ingot obtained in step 1, first use a metal cleaner to remove surface oil, then clean the inner hole and surface with a nitric acid solution with a volume concentration of 30%, and insert the cleaned Nb rod into the cleaned porous copper ingot. In the hole, add copper caps on both ends of the porous copper ingot and seal welding with electron beam, the sealing welding current is 90mA, and the vacuum degree is not greater than 10 -2 Pa, get CuNb multi-core sheath;

[0036] Step 3: Heat the CuNb multi-core sheath obtained in step 2 to 500°C, heat it for 2 hours and then extrude it to obtain a multi-core CuNb composite rod with a diameter o...

Embodiment 2

[0041] Step 1: Select an oxygen-free copper ingot with a diameter of 260mm and a length of 720mm as the ingot, and use the method of deep hole drilling to drill a total of 150 through holes with a diameter of 11mm evenly distributed in 4 layers along the length of the ingot to obtain porous copper. ingot;

[0042] Step 2: For the porous copper ingot obtained in step 1, first use a metal cleaner to remove surface oil, then clean the inner hole and surface with a nitric acid solution with a volume concentration of 25%, and insert the cleaned Nb rod into the cleaned porous copper ingot. In the hole, add copper caps to both ends of the porous copper ingot and seal it with electron beams. The welding current is 50mA, and the vacuum degree is not greater than 10 -2 Pa, get CuNb multi-core sheath;

[0043] Step 3: Heat the CuNb multi-core sheath obtained in step 2 to 600°C, heat it for 1 hour and then extrude it to obtain a multi-core CuNb composite rod with a diameter of 70mm, stre...

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Abstract

The invention discloses a preparation method of a high-critical-current-density Nb3Sn superconductive wire rod. The preparation method comprises: an oxygen-free copper ingot unit is drilled along the length direction to form a plurality of through holes, thereby obtaining a porous copper ingot unit; Nb rods are inserted into the trough holes and copper covers cover the two ends and sealing and welding are carried out, thereby obtaining a CuNb multi-core cladding sheath; extruding is carried out after heating, and the obtained rod material is stretched and then is cut off with a fixed dimension to obtain a CuNb composite rod; deep hole drilling is carried out on the composite rod to obtain a CuNb composite tube, insertion of an SnTi alloy rod is carried out, and stretching moulding is carried out to obtain a sub component; the SnTi or SnCu alloy rod is arranged in the oxygen-free copper tube and stretching is carried out to obtain a Sn / Cu insertion rod; and the sub component, the Sn / Cu insertion rod, and a blocked layer bundle are arranged in the oxygen-free copper tube to obtain an Nb3Sn final blank, and then stretching is carried out by multiple times to obtain a finished Nb3Sn superconductive wire rod. According to the invention, because the a Sn / Cu insertion rod is arranged during the final blank assembling processing, the generated Nb3Sn content during the thermal processing process is improved, so that the critical current density Jc is obviously improved under the circumstance that the low hysteresis loss level of the piled yarn is kept.

Description

technical field [0001] The invention belongs to the technical field of superconducting material processing and relates to a high critical current density Nb 3 A method for preparing a Sn superconducting wire. Background technique [0002] The International Thermonuclear Experimental Reactor (ITER), the largest nuclear fusion device in the world, aims to obtain new energy sources through controllable thermonuclear fusion reactions to solve the increasingly severe energy crisis. my country officially joined the ITER plan negotiation in February 2003, and formally joined the ITER plan in November 2006. China, as one of the member states of the ITER project, will provide about 30 tons of Nb in kind 3 Sn superconducting wires are used in the manufacture of toroidal field (TF) coils. [0003] Nb for ITER 3 Sn superconducting wire requires medium critical current density (J c ) and low hysteresis loss. The inner tin method is the current production of Nb 3 The preferred meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B13/00H01B12/02
CPCH01B12/02H01B13/00Y02E40/60
Inventor 史一功张科高慧贤刘建伟李建峰张丰收刘向宏冯勇
Owner 西部超导材料科技股份有限公司
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