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Method of producing Cu/NbZ metallic composite tube

A metal composite tube and alloy tube technology, which is applied in metal processing equipment, metal wire drawing, manufacturing tools, etc., can solve the problems of low strength, unfavorable to improve the density of MgB core wire, etc., and achieve excellent processing performance and good processing plasticity. Effect

Inactive Publication Date: 2008-03-05
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure Nb and pure Ta are not conducive to improving the MgB due to their low strength. 2 Core density

Method used

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  • Method of producing Cu/NbZ metallic composite tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Firstly, the Nb5Zr alloy tube with a diameter of Φ8.0×1.0mm is HF:HNO 3 = Pickling in 1:3 hydrofluoric acid and nitric acid solution, Φ11.0×1.4mm Cu tube pickling in dilute nitric acid, drying after dehydration, coating the Cu tube on the outer layer of Nb5Zr tube. The assembled Cu / Nb5Zr composite was drawn on a broaching machine with a Φ9.2mm wire drawing die for a single pass at room temperature, and the pass processing rate was 30.05%. Straighten the drawn Cu / Nb5Zr composite pipe and cut off the head and tail to obtain a composite sheath material with a size of Φ9.2×2.5mm. Using the composite pipe as the outer sheath material, the kilometer-level magnesium diboride superconducting wire can be prepared by using the in-situ powder casing method.

Embodiment 2

[0015] First, the NblZr alloy tube with a diameter of Φ12.0×1.5mm is HF:HNO 3 =Pickling in hydrofluoric acid and nitric acid solution of 1:3, pickling of Φ16.5×2.0mm Cu tube in dilute nitric acid, drying after dehydration, coating the Cu tube on the outer layer of NblZr tube. The assembled Cu / NblZr complex was drawn on a broaching machine with a Φ13.5mm wire drawing die for a single pass at room temperature, and the pass processing rate was 33.06%. Straighten the Cu / NblZr composite pipe and cut off the head and tail to obtain a composite sheath material with a size of Φ13.5×3.5mm. Using the composite pipe as the outer sheath material, the kilometer-level magnesium diboride superconducting wire can be prepared by using the in-situ powder casing method.

Embodiment 3

[0017] First, the NblZr alloy tube with a diameter of Φ15.0×2.0mm is HF:HNO 3 =Pickling in 1:3 hydrofluoric acid and nitric acid solution, pickling of Φ20.0×2.4mm Cu tube in dilute nitric acid, dehydration and drying respectively, and coating the Cu tube on the outer layer of Nb1Zr tube. The assembled Cu / NblZr complex was drawn on a broaching machine with a Φ16.0mm wire drawing die for a single pass at room temperature, and the pass processing rate was 36%. Straighten the Cu / Nb1Zr composite pipe and cut off the head and tail to obtain a composite sheath material with a size of Φ16.0×4.5mm. Using the composite pipe as the outer sheath material, the kilometer-level magnesium diboride superconducting wire can be prepared by using the in-situ powder casing method.

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Abstract

The present invention discloses composite Cu / NbZr pipe making process, which includes the following steps: prickling NbZr alloy pipe in mixture solution of hydrofluoric acid and nitric acid in the volume ratio of 1 to 3, prickling Cu pipe in dilute nitric acid solution, dewatering and stoving separately, coating the NbZr alloy pipe onto Cu pipe, drawing the assembled Cu / NbZr composite inside drawing die in one drawing bench in the working modulus of 30-40 %, straightening the drawn composite Cu / NbZr pipe and cutting off two ends to obtain the composite Cu / NbZr pipe. The process is simple and feasible, and the made composite Cu / NbZr pipe has Cu and NbZr alloy interface in metallurgical combination. The composite Cu / NbZr pipe is applied in the superconductive magnesium dibroride wire, and superconductive magnesium dibroride wire in the length over 1000 m may be produced.

Description

technical field [0001] The invention relates to a method for preparing a metal composite pipe, in particular to an in-situ powder casing method for preparing magnesium diboride (MgB 2 ) A method for preparing a Cu / NbZr metal composite tube for a superconducting wire. Background technique [0002] MgB with a superconducting transition temperature of 39K 2 It is a new high-temperature superconducting material discovered by Japanese scientists in 2001. MgB 2 The application can be realized in the working temperature range of the refrigerator (10K-20K), without complex and expensive liquid helium conditions. Low-temperature superconductors cannot work in this temperature range. Combined refrigeration cost and material cost, MgB 2 The application of superconductors in the range of 20-30K, 1-3T magnetic field has obvious technical advantages. Due to the relatively simple process, the in-situ powder-in-tube method has become a popular method for preparing MgB. 2 One of the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C1/18B21C19/00
Inventor 王庆阳闫果刘国庆李成山卢亚锋
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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