An on-line hot drawing method for preparing bronze nb 3 sn superconducting wire method

A technology of superconducting wire and bronze method, which is applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc. It can solve the problems of inability to draw continuously, achieve short annealing time, convenient operation, and low deformation uniform effect

Active Publication Date: 2020-12-01
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

[0003] The object of the invention is to provide a kind of online thermal drawing to prepare bronze method Nb 3 The method of Sn superconducting wire rod, this technology is easy to operate, heat treatment time is short, solves the problem of bronze method Nb 3 The processing of Sn wire requires a large amount of intermediate annealing and cannot be continuously drawn

Method used

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  • An on-line hot drawing method for preparing bronze nb <sub>3</sub> sn superconducting wire method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Step 1: Take bronze method Nb with a diameter of 45mm 3 After 2 passes of 20% cold drawing, the Sn bar is placed in a vacuum heat treatment furnace with a temperature accuracy of ±10°C, and evacuated to 6.0×10 -3 Pa, filled with nitrogen, heated to 500 ℃, kept for 2 hours, cooled down and released, after 5 times of the same drawing and annealing, the bronze method Nb with a diameter of 14.7mm was obtained 3 Sn wire 1;

[0021] Step 2: See figure 1 , the tube furnace 2 with a length of 3m and a temperature accuracy of ±10°C is heated to 500°C, and the bronze method Nb 3 The Sn wire passes through the tube furnace 2, passes through the drawing die 3 on the back side of the tube furnace, and passes through a drawing with a processing rate of 20%, and the drawing speed is 5m / min;

[0022] Step 3: Repeat step 2 and repeat 26 times of online heat drawing to obtain bronze method Nb with a diameter of 0.81mm 3 Sn superconducting wire.

[0023] Using the process of cold dra...

Embodiment 2

[0025] Step 1: Take bronze method Nb with a diameter of 40mm 3 After 3 passes of 15% cold drawing, the Sn bar is placed in a vacuum heat treatment furnace with a temperature accuracy of ±10°C, and evacuated to 7.0×10 -3 Pa, filled with nitrogen, heated to 520 ℃, kept for 2 hours, cooled down and released, after 5 times of the same drawing and annealing, the bronze method Nb with a diameter of 11.8mm was obtained 3 Sn wire 1;

[0026] Step 2: See figure 1 , the tube furnace 2 with a length of 3m and a temperature accuracy of ±10°C is heated to 550°C, and the bronze method Nb 3 The Sn wire passes through the tube furnace 2, passes through the drawing die 3 on the rear side of the tube furnace, and passes through a drawing with a processing rate of 15%, and the drawing speed is 14m / min;

[0027] Step 3: Repeat step 2 and repeat 33 times of online heat drawing to obtain bronze method Nb with a diameter of 0.81mm 3 Sn superconducting wire.

[0028] Using the process of cold dr...

Embodiment 3

[0030] Step 1: Take bronze method Nb with a diameter of 32mm 3 After 3 passes of 14% cold drawing, the Sn bar is placed in a vacuum heat treatment furnace with a temperature accuracy of ±10 °C, and the vacuum is evacuated to 4.0×10 -3 Pa, filled with nitrogen, heated to 450 ℃, kept for 2 hours, cooled down and released, and after 5 times of the same drawing and annealing, a bronze method Nb with a diameter of 7.1 mm was obtained. 3 Sn wire 1;

[0031] Step 2: See figure 1 , the tube furnace 2 with a length of 3m and a temperature accuracy of ±10°C is heated to 450°C, and the bronze method Nb 3 The Sn wire passes through the tube furnace 2, passes through the drawing die 3 on the back side of the tube furnace, and passes through a drawing with a processing rate of 14%, and the drawing speed is 10m / min;

[0032] Step 3: Repeat step 2 and repeat 26 times of online heat drawing to obtain bronze method Nb with a diameter of 1.0mm 3 Sn superconducting wire.

[0033] Using the p...

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Abstract

The invention discloses an online hot drawing preparation method of a bronze process Nb3Sn superconducting wire. After cold drawing of a bronze process Nb3Sn bar, the bronze process Nb3Sn bar is placed in a vacuum heat treatment furnace for intermediate annealing so as to obtain the bronze process Nb3Sn wire; the bronze process Nb3Sn wire passes through the heated tube furnace; online hot drawingis performed on the bronze process Nb3Sn wire through a drawing die on one side of the tube furnace; and the bronze process Nb3Sn wire is obtained after repeated online hot drawing. Online annealing of the bronze process Nb3Sn superconducting wire is realized, operation is convenient, the annealing time is short, the Nb3Sn phase generated by the pre-reaction is reduced, overall deformation of thewire is uniform and the critical current of the wire is high.

Description

technical field [0001] The invention belongs to the technical field of superconducting material processing, in particular to an online hot drawing method for preparing bronze Nb 3 The method of Sn superconducting wire. Background technique [0002] Bronze method Nb 3 Sn wire is a low-temperature superconducting material for making magnets above 10T. It is made of bronze, oxygen-free copper, Nb and other materials. To obtain bronze method Nb with high critical current 3 For Sn wire, it is necessary to use bronze with high tin content to provide sufficient tin source, but high tin bronze will produce extremely fast work hardening during the cold working process and cannot be drawn continuously. Generally, intermediate annealing is carried out when the total working rate reaches about 50%. The processing plasticity of the material. The current bronze method Nb 3 The production of Sn wire rods adopts a large vacuum heat treatment furnace for intermediate annealing, that is,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B12/00H01B13/00
CPCH01B12/00H01B13/00H01B13/0016Y02E40/60
Inventor 张科张平祥郭建华侯婧秦星武博刘建伟郭强李建峰刘向宏冯勇
Owner 西部超导材料科技股份有限公司
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