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Preparation method of Cu-Nb multi-core composite wire with rectangular cross-section

A technology of rectangular cross-section and composite wire, which is applied in the usage of superconductor elements, the manufacture of extensible conductors/cables, and superconductive devices, etc. problem, to achieve the effect of increasing filling factor, improving processing efficiency and high production efficiency

Inactive Publication Date: 2010-10-27
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

In the rolling process, the circular cross-section wire needs to undergo multiple complex plastic deformation processes before it can be transformed into a rectangular cross-section wire. It is not only necessary to select a high-precision rolling mill and billet size, but also to formulate a reasonable rolling process (pass reduction Quantity control, tension adjustment and coordination, etc.), if improperly selected, it is easy to cause uneven deformation of the material due to stress, resulting in cracks and camber defects on the edge of the wire during the rolling process, resulting in a decline in wire performance. At the same time, it also greatly reduces the wire yield

Method used

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  • Preparation method of Cu-Nb multi-core composite wire with rectangular cross-section
  • Preparation method of Cu-Nb multi-core composite wire with rectangular cross-section

Examples

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preparation example Construction

[0043] Such as figure 1 A preparation method of a Cu-Nb multi-core composite wire with a rectangular cross-section shown, comprising the following steps:

[0044] Step 1, the first extrusion assembly, the extrusion assembly process is as follows:

[0045] 101. The first assembly: assemble a single pure Nb rod and an oxygen-free copper outer sheath into a Cu-Nb composite sheath, and the Cu-Nb composite sheath is composed of a single pure Nb rod and a coaxial sleeve on a pure Nb The oxygen-free copper outer sheath on the rod consists of one; the oxygen-free copper outer sheath includes an oxygen-free copper outer sheath one and an upper end cap one and a lower end cap one arranged on the upper and lower ends of the oxygen-free copper outer sheath one;

[0046] 102. The first vacuum sealing welding: use vacuum welding to seal the upper end cap 1 and the lower end cap 1 described in step 101 on the upper and lower ends of the oxygen-free copper outer cladding tube 1;

[0047] 10...

Embodiment 1

[0065] In this embodiment, when the rectangular cross-section Cu-Nb multi-core composite wire is prepared, the preparation process is as follows:

[0066] 101. The first assembly: Assemble a single Φ67mm pure Nb rod and a Φ100×15×280mm oxygen-free copper sheath into a Cu-Nb composite sheath. And before assembling, the pure Nb rod and the oxygen-free copper sheath must be pickled, dehydrated and dried. And when carrying out pickling, adopt the mixed acid that is made up of nitric acid and water to carry out pickling to oxygen-free copper outer sheath one, the volume ratio of nitric acid and water in described mixed acid one is 1: 2; Adopt nitric acid, water and hydrogen The mixed acid two composed of hydrofluoric acid is pickled with pure Nb rods, and then dehydrated with alcohol. The volume ratio of nitric acid, water and hydrofluoric acid in the mixed acid two is 1:2:3. The oxygen-free copper outer sheath includes an oxygen-free copper outer sheath one and an upper end cap I...

Embodiment 2

[0085] In this example, the difference from Example 1 is that when the first extrusion is performed in step 103, the extrusion temperature is 750°C, the holding time is 1.5h, and the extrusion ratio is 25; the second extrusion is performed in step 205 When extruding, the extrusion temperature is 750°C, the holding time is 1.5h, and the extrusion ratio is 25; when performing the third extrusion assembly in step 3 and the fourth extrusion assembly in step 4, the method steps and The relevant process parameters are the same as in step 2; and when two vacuum heat treatments are alternately performed during the fourth main drawing, the temperature of the two vacuum heat treatments is 200°C, and the holding time is 2h; the second time described in step 204 After vacuum sealing, the third vacuum sealing described in step 3 and the fourth vacuum sealing described in step 4, when hot isostatic pressing is performed, the heating temperature is 700°C and the applied pressure is 95Mpa , T...

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Abstract

The invention discloses a preparation method of a Cu-Nb multi-core composite wire with the rectangular cross-section, which comprises the following steps: firstly, carrying out first extrusion assembly and drawing for a single pure Nb rod and a first outer oxygen-free copper sheathing; secondly, carrying out second extrusion assembly and obtaining a first Cu-Nb multi-core composite filament; secondly, according to the extrusion assembly method and related process parameters in the step 2, repeatedly carrying out third extrusion assembly; thirdly, according to the extrusion assembly method and related process parameters in the step 2, repeatedly carrying out fourth extrusion assembly; and finally, setting and drawing by a rectangular mold. The invention has simple process step, short process, high production efficiency, low preparation cost and good use effect, and the produced Cu-Nb multi-core composite wire has superior performance; and the invention is suitable for mass production, can better control the dimensional accuracy of the rectangular cross-section, and can machine any size and length of hundred-million-magnitude-order Cu-Nb multi-core composite wires with the rectangular cross-section.

Description

technical field [0001] The invention relates to a preparation method of a multi-core composite superconducting wire, in particular to a preparation method of a Cu-Nb multi-core composite wire with a rectangular cross section. Background technique [0002] High-strength and high-conductivity copper-based materials are a class of structural and functional materials with excellent comprehensive physical and mechanical properties. They not only have excellent electrical conductivity, but also have high strength and excellent high temperature resistance. They are widely used in transfer switches and point contactors. , lead frame, single-point spring and other devices are mainly used in high-field pulse magnets in recent years. With the continuous expansion of the application field of high-strength and high-conductivity copper-based materials, their consumption is also growing rapidly. This material is considered to be extremely New functional materials with development potential...

Claims

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Application Information

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IPC IPC(8): H01B12/02H01B13/008
CPCY02E40/641Y02E40/60
Inventor 陈自力梁明卢亚锋闫果李成山张平祥段颖
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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