Optimization method for improving performance of Nb3Sn superconducting strand Rutherford stranded cable

An optimization method and strand technology, applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc., can solve problems such as subcomponent rupture and performance degradation of Sn wire twisted cables, etc., to improve reliability performance, control critical performance reduction, and ensure the effect of yield strength

Active Publication Date: 2021-07-13
西部超导材料科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the invention is to provide a kind of improved Nb 3 Optimization method for the performance of Sn superconducting strand Rutherford twisted cable, solving the problem of Nb in the existing twisted cable process 3 The problem of subcomponent rupture caused by large plastic deformation of Sn strands, avoiding Nb 3 The performance of the Sn wire is degraded after twisting

Method used

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  • Optimization method for improving performance of Nb3Sn superconducting strand Rutherford stranded cable
  • Optimization method for improving performance of Nb3Sn superconducting strand Rutherford stranded cable
  • Optimization method for improving performance of Nb3Sn superconducting strand Rutherford stranded cable

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Embodiment 1

[0017] An improved Nb 3 Optimization method for the performance of Rutherford stranded cables with superconducting strands of Sn, Nb 3 Cross section of Sn superconducting strands, see figure 1 , from the inside to the outside are composed of tin alloy 1, Nb core wire region 2 and Cu substrate region 3 respectively. The optimization method specifically includes the following steps:

[0018] Step 1: Nb with a diameter of 1.00mm 3 The Sn strands are rewound on the steel wire wheel, placed in a vacuum heat treatment furnace, and kept at a constant temperature of 250 ° C for 30 minutes;

[0019] Step 2: stop heating, the Nb obtained by heat treatment in step 1 3 Cut a sample with a length of 10 mm on the Sn strand, grind and polish the cross section of the strand, and use a Vickers hardness tester to test the hardness of different positions of the outer Cu substrate;

[0020] Step 3: Nb obtained by heat treatment in Step 1 3 A sample with a length of 300mm was cut from the Sn...

Embodiment 2

[0024] Step 1: Nb with a diameter of 0.82mm 3 The Sn strands are rewound on the steel wire wheel, placed in a vacuum heat treatment furnace, and kept at a constant temperature of 200 ° C for 120 minutes;

[0025] Step 2: stop heating and heat treat the resulting Nb in step 1 3 Cut a sample with a length of 10mm on the Sn strand, grind and polish the cross section of the strand, and use a Vickers hardness tester to test the hardness of 5 points on the outer Cu substrate;

[0026] Step 3: Heat-treat the resulting Nb in Step 1 3 A sample with a length of 300mm was cut from the Sn strand, and the Nb after heat treatment was tested 3 Sn strand yield strength;

[0027] Step 4: Comparing the hardness of the Cu base material of the outer layer after the heat treatment in step 2 with that before the heat treatment, the hardness of the Cu base material decreased by 22% to 30% after the heat treatment; 3 The tensile mechanical properties of Sn strands were compared with those before ...

Embodiment 3

[0030] Step 1: Nb with a diameter of 1.00mm 3 The Sn strands are rewound on the steel wire wheel, placed in a vacuum heat treatment furnace, and kept at a constant temperature of 180°C for 60 minutes;

[0031] Step 2: stop heating and heat treat the resulting Nb in step 1 3 Cut a sample with a length of 10mm on the Sn strand, grind and polish the cross section of the strand, and use a Vickers hardness tester to test the hardness of 5 points on the outer Cu substrate;

[0032] Step 3: Heat-treat the resulting Nb in Step 1 3 A sample with a length of 300mm was cut from the Sn strand, and the Nb after heat treatment was tested 3 Sn strand yield strength;

[0033] Step 4: Comparing the hardness of the Cu base material of the outer layer after the heat treatment in step 2 with that before the heat treatment, the hardness of the Cu base material after the heat treatment is reduced by 20% to 30%; 3 The tensile mechanical properties of Sn strands were compared with those before he...

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Abstract

The invention discloses an optimization method for improving the performance of an Nb3Sn superconducting strand Rutherford stranded cable. The cross section of an Nb3Sn superconducting strand is composed of a tin alloy area, an Nb core wire area and a Cu base material area from inside to outside. The Nb3Sn superconducting strand is subjected to vacuum heat treatment, and the hardness of an outer-layer Cu base material of the Nb3Sn superconducting strand after heat treatment is reduced by 20%-50% compared with that before heat treatment. According to the method, an Nb3Sn plied yarn is preheated before cable stranding, so that the outer-layer Cu base material is softened to a certain degree, and the hardness of an internal Nb core wire is almost unchanged, thereby ensuring that the core wire does not generate larger plastic deformation in the cable stranding process, preventing the critical performance of the Nb3Sn plied yarn from being greatly reduced, and improving the reliability of the stranded cable.

Description

technical field [0001] The invention belongs to the technical field of superconducting material processing methods, in particular to an improved Nb 3 Optimization method for performance of Sn superconducting wire Rutherford twisted cable. Background technique [0002] High performance Nb 3 The critical current density Jc of Sn (Niobium-Three-Sn) superconducting wire reaches 2000A / mm under the conditions of 12T and 4.5K 2 The above are the main superconducting materials that generate high-field magnetic fields at present. In practical engineering applications, twisted high-field magnets usually use twisted Nb 3 Sn superconducting strands. Nb 3 The twisted cable of Sn superconducting strands is similar to the twisted method of ordinary copper cables, and is formed by multi-stage twisting. But unlike ordinary cables, Nb 3 Sn strands are made of three materials: Cu (copper), Nb (niobium), and Sn (tin). The strands are very sensitive to deformation during the stranding pro...

Claims

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Application Information

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IPC IPC(8): H01B12/08
CPCH01B12/08Y02E40/60
Inventor 武博陈建亚史一功郭强刘向宏冯勇闫果张平祥
Owner 西部超导材料科技股份有限公司
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