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Preparation method of multicore composite rod of low-temperature superconducting wire Cu/Nb

A low-temperature superconducting and composite rod technology, which is applied in the usage of superconducting elements, superconducting/high-conducting conductors, superconducting devices, etc. Complex problems, to achieve the effect of low interface bonding risk, high quality stability, and simplified process

Active Publication Date: 2010-10-13
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

This preparation method needs to be assembled twice by single-core sheath and multi-core sheath, especially the assembly of multi-core sheath is more difficult; secondly, the preparation of single mandrel needs to go through drawing, forming, cutting, straightening, It can only be assembled after cleaning, the process is more complicated, there are many procedures, and the quality stability is low; again, the interface inside the single mandrel and the interface between the single mandrels have the problem of metallurgical bonding, and the risk of interface bonding is relatively high, which also gives Later reassembly stretching brings greater risks; finally, the obtained multi-core sheath is small in size and weight, and after extrusion, it is necessary to cut off the unevenly distributed parts of the head and tail core rods, resulting in multi-core composite rods low yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Taking an oxygen-free copper ingot with a diameter of Φ270mm and a length of 600mm as the billet, drill 170 through holes with a diameter of Φ14mm on the billet by means of deep hole drilling. Porous Cu ingots were cleaned by first corroding with 40% nitric acid solution for 2 minutes, then with 10% nitric acid solution for 2 minutes, and finally rinsed with pure water for 5 minutes and dried. Composite sheathing of the core, electron beam sealing and welding after the bottom and cover are added at both ends; during the sealing and welding process, the vacuum degree is less than 10 -5 KPa, the welding current is 50mA, and the welding speed is 100mm / min; after sealing and welding, the multi-core sheath is heated to 600°C for 30 minutes, and then back-extruded after 3 hours of heat preservation, the extrusion pressure is 2000 tons, and the extrusion speed is 3mm / s, that is to obtain a low-temperature superconducting wire Cu / Nb multi-core composite rod with a diameter of Φ...

Embodiment 2

[0033] Taking an oxygen-free copper ingot with a diameter of Φ200mm and a length of 500mm as the billet, drill 195 uniformly distributed through holes with a diameter of Φ10mm on the billet by means of deep hole drilling. After cleaning the porous Cu ingot, it was corroded with 30% nitric acid solution for 5 minutes, then with 5% nitric acid solution for 5 minutes, and finally rinsed with pure water for 2 minutes and dried. Composite sheathing of the core, electron beam sealing and welding after the bottom and cover are added at both ends; during the sealing and welding process, the vacuum degree is less than 10 -5 KPa, the welding current is 150mA, and the welding speed is 200mm / min; after sealing and welding, the multi-core sheath is heated to 500°C for 60 minutes, and then back-extruded after 1 hour of heat preservation, the extrusion pressure is 4000 tons, and the extrusion speed is 10mm / s, that is to obtain a low-temperature superconducting wire Cu / Nb multi-core composite...

Embodiment 3

[0035] Taking an oxygen-free copper ingot with a diameter of Φ300mm and a length of 800mm as the billet, drill 150 uniformly distributed through holes with a diameter of Φ15mm on the billet by means of deep hole drilling. After cleaning the porous Cu ingot, it was corroded with 35% nitric acid solution for 3 minutes, then with 8% nitric acid solution for 3 minutes, and finally rinsed with pure water for 3 minutes and dried. Composite sheathing of the core, electron beam sealing and welding after the bottom and cover are added at both ends; during the sealing and welding process, the vacuum degree is less than 10 -5 KPa, the welding current is 100mA, and the welding speed is 150mm / min; after sealing and welding, the multi-core sheath is heated to 550°C for 45 minutes, and then back-extruded after 5 hours of heat preservation, the extrusion pressure is 3000 tons, and the extrusion speed is 6mm / s, that is to obtain a low-temperature superconducting wire Cu / Nb multi-core composite...

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Abstract

The invention discloses a preparation method of a multicore composite rod of low-temperature superconducting wire Cu / Nb, which comprises the steps of: drilling a plurality of uniformly distributed through holes with the diameter of phi 10mm to 15mm on an oxygen-free copper ingot along the length direction of the ingot with a deep hole drilling method; then cleaning; inserting a Nb rod which has the same dimension with that of the through holes of the porous copper ingot into a clean copper ingot to form a multicore composite sheath; adding a bottom and a cover on both ends of the multicore composite sheath; then carrying out electron beam sealing welding; heating the multicore sheath within 30 to 60 minutes to 500 DEG C to 600 DEG C; keeping the temperature for 1 to 5 hours; and then carrying out backward extrusion to obtain the multicore composite rod of low-temperature superconducting wire Cu / Nb. The preparation method of the multicore composite rod of low-temperature superconducting wire Cu / Nb has the advantages of smaller assembly difficulty, simplification of technological process, smaller interface combination risk, higher quality stability and higher yield of the composite rod.

Description

technical field [0001] The invention belongs to the technical field of superconducting material preparation technology, and relates to a method for preparing a Cu / Nb multi-core composite rod of a low-temperature superconducting wire. Background technique [0002] The low-temperature superconducting wire belongs to a kind of multi-core composite material. The current preparation method of the low-temperature superconducting wire multi-core composite rod is as follows: firstly, a single-core sheath or a composite rod is assembled, and then a single-core composite rod is obtained after extrusion or stretching, and several single-core composite rods are assembled to form a multi-core composite package. set, and then extruded to obtain a multi-core composite rod. This preparation method needs to be assembled twice by single-core sheath and multi-core sheath, especially the assembly of multi-core sheath is more difficult; secondly, the preparation of single mandrel needs to go th...

Claims

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Application Information

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IPC IPC(8): H01B13/00H01B12/02
CPCY02E40/641Y02E40/60
Inventor 刘建伟李建峰王天成李春广肖成举管军强万小波孙霞光冯勇刘向宏张平祥
Owner 西部超导材料科技股份有限公司
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