A kind of preparation method of mgb2 single-core composite rod for extrusion

A composite rod, single-core technology, applied in the usage of superconductor elements, cable/conductor manufacturing, superconductor/high-conductor conductors, etc. effect of chemical preparation

Active Publication Date: 2019-06-11
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

MgB prepared by this method 2 Both ends of the single-core composite rod have oxygen-free copper plugs, pickled MgB 2 When the single-core composite rod is used, it can avoid the contact between the acid liquid and the highly active precursor powder in the composite rod, which will affect the superconducting activity of the precursor powder and avoid the MgB 2 MgB prepared by single-core composite rod 2 The superconducting performance of the wire is reduced, and it also solves the disadvantage of avoiding the large waste of raw materials in the traditional single powder filling and drawing process, and can realize batch production

Method used

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  • A kind of preparation method of mgb2 single-core composite rod for extrusion

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1. Draw and process the commercial oxygen-free copper rod with the initial size of Φ15mm to a long oxygen-free copper rod of Φ8mm. After straightening, it is cut into several sections of oxygen-free copper short rods with lengths of 10mm, 15mm and 80mm by wire cutting equipment. 1. The two ends of each oxygen-free copper short rod 1 are ground and leveled respectively, then pickled to remove the surface oxide layer, cleaned and then removed the residual acid and dried;

[0027]In step 2, the oxygen-free copper short rod 1 dried in step 1 is placed in a vacuum heat treatment furnace for annealing heat treatment; the annealing heat treatment is vacuum annealing heat treatment, the temperature of vacuum annealing heat treatment is 500°C, and the holding time is 2h, Vacuum degree is less than 10 -3 Pa;

[0028] Step 3: First, plug the port A of the metal tube 3 with an oxygen-free copper short rod 1 with a size of Φ8×10mm after annealing and heat treatment in Step 2, ...

Embodiment 2

[0033] Step 1. Draw and process the commercial oxygen-free copper rod with the initial size of Φ16mm to a long oxygen-free copper rod of Φ9.5mm. After straightening, use wire cutting equipment to cut into several sections of oxygen-free copper with lengths of 10mm, 20mm and 90mm. Short rod 1, the two ends of each oxygen-free copper short rod 1 are ground and leveled respectively, and then pickled to remove the surface oxide layer, after cleaning, the residual acid is removed and dried;

[0034] Step 2: Place the oxygen-free copper short rod 1 dried in step 1 in a vacuum heat treatment furnace for annealing heat treatment; the annealing heat treatment is vacuum annealing heat treatment, the temperature of vacuum annealing heat treatment is 550°C, and the holding time is 1.5h , the vacuum degree is less than 10 -3 Pa;

[0035] Step 3: First, use the oxygen-free copper short rod 1 with a size of Φ9.5×10mm after annealing and heat treatment in step 2 to block the port A of the me...

Embodiment 3

[0039] Step 1. Draw and process the commercial oxygen-free copper rod with the initial size of Φ18mm to a long oxygen-free copper rod of Φ10mm. After straightening, use wire cutting equipment to cut into several sections of oxygen-free copper short rods with lengths of 10mm, 30mm and 100mm respectively. 1. The two ends of each oxygen-free copper short rod 1 are ground and leveled respectively, then pickled to remove the surface oxide layer, cleaned and then removed the residual acid and dried;

[0040] In step 2, the oxygen-free copper short rod 1 after drying in step 1 is placed in a vacuum heat treatment furnace for annealing heat treatment; the annealing heat treatment is vacuum annealing heat treatment, the temperature of vacuum annealing heat treatment is 600 ° C, and the holding time is 1 h, Vacuum degree is less than 10 -3 Pa;

[0041] Step 3, first use the oxygen-free copper short rod 1 with a size of Φ10×10mm after the annealing heat treatment in step 2 to block the ...

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Abstract

The invention discloses a preparation method for extrusion M<g>B<2> single core composite bars. The method comprises the steps of 1, carrying out straightening, cutting, acid cleaning, cleaning and drying processing in sequence, thereby obtaining oxygen free copper short rods; 2, carrying out annealing heat treatment on the oxygen free copper short rods; 3, sealing a port A of a metal pipe throughthe oxygen free copper short rod, filling the metal pipe with superconductive powder, sealing the port B of the metal pipe through the oxygen free copper short rod, and in a process of filling the superconductive powder, the oxygen free copper short rod is placed in the metal pipe every other certain distance, wherein the oxygen free copper short rods are used for isolating precursor powder; and4, assembling the metal pipe filled with the precursor powder into an oxygen free copper clad bushing, carrying out drawing to obtain a composite long rod, carrying out cut-off along the middle positions of the oxygen free copper short rods in the composite long rod, and carrying out the acid cleaning to obtain the extrusion M<g>B<2> single core composite bars. According to the extrusion M<g>B<2>single core composite bars prepared by the invention, the two ends are sealed by the oxygen free copper short rods, so the superconductive powder is prevented from being corroded by acid liquor when the acid cleaning is carried out, and mass production can be realized.

Description

technical field [0001] The invention belongs to the technical field of preparation of superconducting rods, and in particular relates to a MgB for extrusion 2 Preparation method of single-core composite rod. Background technique [0002] Magnesium Diboride (MgB 2 ) material’s superconducting critical transition temperature (T c ) is 39K, its superconductivity was first discovered by Japanese scientists in 2001, and it is a metal compound with a simple binary structure. Similar to oxide high-temperature superconducting materials (OHTS), this material is similar to a brittle compound phase with ceramic properties. It does not have processing plasticity and cannot be directly processed into wire and strip. Plastic processing is usually required after metal cladding. The most common multi-core MgB 2 The preparation method of superconducting wire is the so-called powder casing method (PIT), which is to mix Mg and B powder or MgB. 2 The superconducting powder is filled into t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B12/04H01B13/00
CPCH01B12/04H01B13/00Y02E40/60
Inventor 王庆阳闫果冯建情熊晓梅杨芳李成山冯勇张平祥
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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