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Process for preparing bronze Nb3Sn superconducting wire material

A technology of superconducting wire rod and preparation process, which is applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc. problems such as current carrying, to achieve the effect of improving the performance of the strand, shortening the heat treatment cycle, and optimizing the process

Active Publication Date: 2011-06-01
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 such temperature has caused its longer heat treatment cycle, about 15 hours per furnace, the total time of multiple annealings is very long, and it cannot meet industrial production, and the most serious is excessively high temperature and longer heating and heating. Cooling time leads to premature Nb formation on the surface of Nb alloy 3 The Sn layer reduces the strength of the wire during cold working, which affects the plastic molding of the wire and the final core wire forming. The molding of the core wire directly affects the current-carrying capacity of the finished wire. The current 520°C heat treatment process, the critical current I c lower than 100A

Method used

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  • Process for preparing bronze Nb3Sn superconducting wire material
  • Process for preparing bronze Nb3Sn superconducting wire material
  • Process for preparing bronze Nb3Sn superconducting wire material

Examples

Experimental program
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Embodiment 1

[0026] The high-tin bronze ingot is drilled and assembled with a niobium alloy rod, and then EB electron beam vacuum sealing and welding is used to obtain a billet to be extruded with a diameter of Φ200mm, and then a billet a with a diameter of Φ60mm is obtained through hot extrusion, and the billet a is used as a drawing The blank is loaded into the annealing furnace for the first annealing, and after being loaded into the annealing furnace, it is vacuumed to less than 1.0×10 -2 Pa, the furnace chamber is filled with high-purity argon, and the vacuum degree is 8.5×10 3 Pa, heat up to 420°C with a heating rate of 4°C / min; use a thermocouple to monitor the material temperature, and keep the temperature for 30 minutes after the material temperature reaches 420°C; The material is stretched repeatedly at a processing rate of 10%, and then the hexagonal subcomponent is obtained through the subcomponent forming process. The obtained hexagonal subcomponent, barrier layer, and copper ...

Embodiment 2

[0029] The high-tin bronze ingot is drilled and assembled with a niobium alloy rod, and then EB electron beam vacuum sealing welding is used to obtain a billet to be extruded with a diameter of Φ100mm, and then a billet a with a diameter of Φ30mm is obtained through hot extrusion, and the billet a is used as a drawing The blank is loaded into the annealing furnace for the first annealing, and after being loaded into the annealing furnace, it is vacuumed to 8.5×10 -3Pa, the furnace chamber is filled with high-purity nitrogen, and the vacuum degree is 5.3×10 3 Pa, heat up to 480°C at a rate of 5°C / min; use a thermocouple to monitor the material temperature, and keep the temperature for 60 minutes after the material temperature reaches 480°C; The processing rate repeatedly stretches the material, and then obtains the hexagonal subcomponent through the subcomponent forming process. The obtained hexagonal subcomponent, the barrier layer, and the copper sheath are finally assembled,...

Embodiment 3

[0032] The high-tin bronze ingot is drilled and assembled with a niobium alloy rod, and then EB electron beam vacuum sealing and welding is used to obtain a billet to be extruded with a diameter of Φ170mm, and then a billet a with a diameter of Φ55mm is obtained through hot extrusion, and the billet a is used as a drawing The billet is loaded into the annealing furnace for the first annealing, and after being loaded into the annealing furnace, it is vacuumed to 6.5×10 -3 Pa, the furnace chamber is filled with high-purity argon, and the vacuum degree is 1.01×10 5 Pa, heat up to 430°C at a speed of 8°C / min; use a thermocouple to monitor the material temperature, and keep the temperature for 90 minutes after the material temperature reaches 430°C; The % processing rate is used to repeatedly stretch the material; then the hexagonal subcomponent is obtained through the subcomponent forming process, and the obtained hexagonal subcomponent, barrier layer, and copper sheath are finall...

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Abstract

The invention discloses a process for preparing a bronze Nb3Sn superconducting wire material. The process comprises the following steps of: drilling a hole on a high tin bronze ingot, assembling the drilled ingot with a niobium alloy rod, soldering and sealing under vacuum, and performing hot extrusion to obtain a rod blank a which serves as a tensile blank; filling the tensile blank in an annealing furnace to perform first annealing; charging a furnace chamber of the annealing furnace with high-purity argon or nitrogen; heating the furnace chamber to the temperature of between 420 and 480 DEG C at the rate of 4 to 8 DEG C / minute; preserving the heat for 30 to 90 minutes; performing forced cooling by circulating the argon or the nitrogen; discharging when the material is cooled to the temperature of between 50 and 100 DEG C; repeatedly processing the material; performing a subcomponent molding process to obtain a hexagonal subcomponent; assembling, soldering and sealing under vacuum and performing the hot extrusion to obtain a rod blank b; and performing second annealing, twisting, performing final stretching and electroplating to obtain the Nb3Sn superconducting wire material. By the process for preparing the bronze Nb3Sn superconducting wire material, the surface of an Nb alloy is improved, and the performance of a strand wire is improved.

Description

technical field [0001] The invention belongs to the technical field of superconducting material processing, and relates to a bronze method Nb 3 Preparation process of Sn superconducting wire. Background technique [0002] Bronze method Nb 3 Sn low-temperature superconducting wire is a practical wire for manufacturing low-temperature magnets above 10T. It is made of bronze, oxygen-free copper, Nb alloy and barrier layer materials. Bronze process Nb for production of high critical current 3 Sn superconducting strands need to use high-tin bronze to provide sufficient tin to facilitate subsequent Nb 3 Generation of Sn. However, high-tin bronze will produce extremely rapid work hardening during cold working, making subsequent processing impossible. Therefore, an effective intermediate annealing process is needed to improve the subsequent processing plasticity of high-tin bronze. [0003] Existing bronze method Nb 3 The intermediate annealing of Sn usually refers to the anne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01B12/02
CPCY02E40/641Y02E40/60
Inventor 郭建华贾晶晶张科王天成张丰收刘向宏冯勇张平祥
Owner 西部超导材料科技股份有限公司
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