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A kind of preparation method of copper-niobium reinforced matrix for bronze method nb3sn wire rod

A bronze method and wire technology, which is used in cable/conductor manufacturing, superconducting/high-conducting conductors, and the usage of superconducting elements, etc., can solve problems such as poor reinforcement effect and affect wire formation, and meet the requirements of magnet preparation process. , good plastic processing ability, the effect of improving mechanical properties

Active Publication Date: 2018-03-23
西部超导材料科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the invention is to provide a kind of bronze method Nb 3 The preparation method of copper niobium reinforced matrix for Sn wire rod solves the problem of filling the CuNb matrix prepared by the existing method with bronze method Nb 3 Sn, poorly enhanced, and affects Nb 3 The problem of Sn wire forming into a wire

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  • A kind of preparation method of copper-niobium reinforced matrix for bronze method nb3sn wire rod

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preparation example Construction

[0024] A kind of bronze method Nb of the present invention 3 The preparation method of copper-niobium reinforced matrix for Sn wire rod specifically comprises the following steps:

[0025] Step 1, assembly preparation:

[0026] Using oxygen-free copper rods of Φ185mm~250mm as the blank, deep hole drilling is carried out on the copper rods, and 55~91 through holes in hexagonal close-packed distribution are drilled in the deep holes on the end surface, and the hole diameter ranges from Φ7.5mm~Φ16mm;

[0027] Porous oxygen-free copper rods are cleaned with 10% to 15% chromic acid, and Nb rods with a size of Φ7mm to Φ15.5mm are pickled with hydrofluoric acid-nitric acid mixed acid solution. In the mixed acid, the mass fraction of hydrofluoric acid is 10% to 15%, the mass fraction of nitric acid is 20% to 35%; the material after pickling is rinsed with deionized water to be neutral, and then the material is dehydrated with industrial ethanol and air-dried with a hot air blower, an...

Embodiment 1

[0038] Use Φ185×600mm oxygen-free copper rod 1 deep hole to process 55 holes of Φ8mm, the distribution of the holes is as follows figure 1 As shown, the upper and lower covers of Φ185×30mm are processed, the porous oxygen-free copper rod and the upper and lower covers are cleaned in 12% chromic acid, and the niobium rod of Φ7.5mm is pickled with hydrofluoric acid-nitric acid mixed acid solution , in the mixed acid, the massfraction of hydrofluoric acid is 10%, and the massfraction of nitric acid is 20%; The material after pickling is rinsed with deionized water, and then industrial ethanol is used to dehydrate the material and air-dried by a hot air blower. Air dry the last to dry. Put the niobium rod into the porous oxygen-free copper rod, and then use the vacuum electron beam welding machine to seal the upper and lower covers and the porous oxygen-free copper rod and then weld them together. The vacuum degree of the welding chamber is 1.0×10 -3 Pa, the beam current of the e...

Embodiment 2

[0040] Use Φ220×600mm oxygen-free copper rods to process 61 hexagonal close-packed Φ13mm holes, process Φ220×30mm upper and lower covers, and clean the porous oxygen-free copper rods and upper and lower covers in 15% chromic acid , Φ12.5mm niobium rods are pickled with hydrofluoric acid-nitric acid mixed acid solution. In the mixed acid, the mass fraction of hydrofluoric acid is 12%, and the mass fraction of nitric acid is 30%. The material after pickling is deionized Rinse with water, then use industrial ethanol to dehydrate the material and use a hot air blower to air-dry, and finally dry it after air-drying. Put the niobium rod into the porous oxygen-free copper rod, use the vacuum electron beam welding machine to seal the upper and lower covers and the porous oxygen-free copper rod, and then weld them together. The vacuum degree of the welding chamber is 3.0×10 -3 Pa, the beam current size of the electron beam is 82mA. The welded composite rod is hot-extruded. After extru...

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Abstract

The invention discloses a preparation method of a copper-niobium reinforced matrix for a Nb3Sn wire fabricated by a bronze process. The preparation method comprises the steps of: firstly, compounding a Nb rod with a non-oxygen copper rod to prepare a multi-core CuNb round rod; then carrying out secondary assembling on the multi-core CuNb round rod and the non-oxygen copper rod to prepare a multi-core CuNb hexagonal rod so as to obtain the copper-niobium reinforced matrix for the Nb3Sn wire fabricated by the bronze process. The CuNb composite rod obtained by adopting the method disclosed by the invention has ultimate tensile strength of about 600MPa to 1,300MPa and has excellent plastic processing capacity; a final bronze-processed Nb3Sn sheath is filled with the CuNb composite rod; the obtained final wire has tensile strength of 100MPa to 400MPa; the mechanical property of the bronze process Nb3Sn wire is effectively improved; and the magnet preparation process requirements for firstly performing the reaction and then carrying out winding are met.

Description

technical field [0001] The invention belongs to the technical field of superconducting material processing, in particular to a bronze method Nb 3 A method for preparing a copper-niobium reinforced matrix for Sn wire rods. Background technique [0002] With the development of the reaction-first-winding process in the preparation technology of high-field magnets, the traditional bronze method Nb 3 Sn wire can no longer meet its process requirements, so the enhanced bronze method Nb 3 More and more Sn wires have been studied and applied, and the preparation of CuNb reinforced matrix has become the enhanced bronze method Nb 3 The key technology of Sn wire preparation. However, at this stage, the CuNb reinforced matrix is ​​prepared by the in-situ alloy method, that is, the CuNb reinforced matrix is ​​prepared by vacuum smelting. Since Cu and Nb are immiscible metals, its melting is relatively difficult, and the obtained CuNb matrix has , the obtained CuNb matrix reinforcemen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B13/00H01B12/10
CPCH01B12/10H01B13/00Y02E40/60
Inventor 郭建华张科刘建伟李建峰刘向宏冯勇张平祥
Owner 西部超导材料科技股份有限公司