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Preparation method of kilometer-level multi-core MgB2 superconducting wire

A superconducting wire and wire technology, applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc., can solve problems such as uneven powder deformation, damage to metal sheath, and reduced wire transportation performance. , to achieve the effect of reducing deformation defects and uniform performance

Pending Publication Date: 2021-06-15
西部超导材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Preparation of MgB by stretching in the traditional preparation process 2 In the case of wire, the deformation of the powder is carried out through the tangential friction between the metal sheath and the powder. On the one hand, this will lead to uneven deformation of the powder and bamboo-shaped structural defects; on the other hand, the metal sheath will be Powder friction and extrusion damage will reduce the transport performance of the wire; the accumulation of similar defects will affect the uniformity of the wire performance, and in severe cases, wire breakage will occur. This situation is important in the preparation of kilometer-level MgB 2 It is more serious in the process of multi-core wire, which leads to the limitation of wire length and curbs MgB 2 The practical development process of wire

Method used

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  • Preparation method of kilometer-level multi-core MgB2 superconducting wire

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preparation example Construction

[0021] The invention provides a kilometer-level multi-core MgB 2 A method for preparing a superconducting wire, specifically comprising the following steps:

[0022] 1) Mix Mg powder and B powder according to the atomic ratio of 1:2, and grind to obtain precursor powder;

[0023] 2) Put the precursor powder into the Cu / Nb tube to assemble into Cu / Nb / MgB 2 Single mandrel, Cu / Nb / MgB by swaging 2 The single core rod is processed to the same size as the Cu center rod;

[0024] 3) Cu / Nb / MgB with the same size 2 The single mandrel and the Cu center rod are cut to length and cut in sequence, and put into the Monel tube to assemble into a multi-core composite sheath;

[0025] 4) The multi-core composite sheath is processed by swaging to obtain the finished wire rod;

[0026] 5) heat-treat the finished wire to obtain MgB 2 Multi-core superconducting wire.

[0027] Further, in step 2), Cu / Nb / MgB 2 The diameters of the single core rod and the Cu center rod are both Φ2.5mm~Φ6.0mm....

Embodiment 1

[0035] This embodiment provides a kilometer-level multi-core MgB 2 A method for preparing a superconducting wire, specifically comprising the steps of:

[0036] 1) Preparation of precursor powder: Weigh 353g of Mg powder and 343g of C-coated B powder in a glove box, mix Mg powder and B powder according to the atomic ratio of 1:2, and obtain the precursor powder after mechanical mixing for 20s;

[0037] 2) Preparation of single mandrel and center rod: the precursor powder is loaded into Cu / Nb tube to assemble Cu / Nb / MgB 2 Single mandrel, the single mandrel is processed to a diameter of 4.0mm by swaging; the Cu rod is processed to a diameter of 4.0mm by swaging to obtain a central rod;

[0038] 3) Preparation of 30+7-core composite sheath: the Cu / Nb / MgB prepared in step 2) 2 The single mandrel and the Cu center rod are cut into short rods with a length of 3m, where Cu / Nb / MgB 2 30 single mandrels and 7 Cu center rods are put into Monel tubes and assembled into 30+7 core composi...

Embodiment 2

[0043] This embodiment provides yet another kilometer-level multi-core MgB 2 A method for preparing a superconducting wire, specifically comprising the steps of:

[0044] 1) Preparation of precursor powder: Weigh 402g of Mg powder and 394g of C-coated B powder in the glove box, mix Mg powder and B powder according to the atomic ratio of 1:2, and obtain the precursor powder after mechanical mixing for 20s;

[0045] 2) Preparation of single mandrel and center rod: the precursor powder is loaded into Cu / Nb tube to assemble Cu / Nb / MgB 2 Single mandrel, the single mandrel is processed to a diameter of 6.0mm by swaging; the Cu rod is processed to a diameter of 6.0mm by swaging to obtain a center rod;

[0046] 3) Preparation of 18+1 core composite sheath: the Cu / Nb / MgB prepared in step 2) 2 The single mandrel and the Cu center rod are cut into short rods with a length of 2.5m, where Cu / Nb / MgB 2 18 single core rods, 1 Cu center rod, put into Monel tube, assembled into 18+1 core comp...

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Abstract

The invention belongs to the technical field of superconducting wire preparation, and relates to a preparation method of a kilometer-level multi-core MgB2 superconducting wire. The preparation method comprises the steps of mixing Mg powder and B powder according to an atomic ratio of 1: 2, and grinding to obtain precursor powder; loading the precursor powder into a Cu / Nb tube to be assembled into a Cu / Nb / MgB2 single-core rod, and machining the Cu / Nb / MgB2 single-core rod to be the same as a Cu center rod in size through rotary swaging; sequentially sizing and cutting off the Cu / Nb / MgB2 single-core rod and the Cu center rod which are the same in size, and putting the Cu / Nb / MgB2 single-core rod and the Cu center rod into a Monel pipe to be assembled into a multi-core composite sheath; performing rotary swaging processing on the multi-core composite sheath to obtain a finished wire; and carrying out heat treatment on the finished wire rod to obtain the MgB2 multi-core superconducting wire. According to the method, the deformation defect in the wire is overcome in a rotary swaging machining mode, the phenomenon of core breakage or wire breakage is reduced, and the kilometer-level MgB2 superconducting wire which is uniform in performance and meets actual requirements is prepared.

Description

technical field [0001] The invention belongs to the technical field of superconducting wire preparation, and relates to a kilometer-level multi-core MgB 2 Preparation method of superconducting wire. Background technique [0002] Since 2001, Japanese scientists reported that the binary intermetallic compound-magnesium diboride (MgB 2 ) since its superconducting properties, because of its superconducting transition temperature of 39K, long coherence length and low cost of raw materials, it is considered that medical magnetic resonance imaging (MRI) There is great potential for applications using superconducting magnets. MgB 2 Superconducting wires are usually prepared by the powder-in-tube method (PIT), which is obtained by loading the precursor powder into a metal tube, stretching it into a wire, and then performing phase-forming heat treatment. MgB required for superconducting magnets for MRI 2 The length of the superconducting wire is generally in the kilometer level o...

Claims

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Application Information

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IPC IPC(8): H01B12/10H01B12/00
CPCH01B12/10H01B12/00Y02E40/60
Inventor 王大友郗丹侯艳荣闫果刘向宏冯勇张平祥
Owner 西部超导材料科技股份有限公司
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