CN103871683A

CN103871683A - Preparation method of superconducting wires

Info

Publication number: CN103871683A
Application number: CN201210552352.9A
Authority: CN
Inventors: 张亮
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-12-18
Filing date: 2012-12-18
Publication date: 2014-06-18

Abstract

The invention discloses a preparation method of superconducting wires, which comprises the following four steps of producing composite rods, assembling and sealing, hot extrusion processing, and drawing processing. The problem that Al foil and Nb foil do not match due to deformation, so that the area ratio of Al and Nb is less than 1: 3 in an Nb3Al winding method machining process, and thus Nb3Al can not be completely produced, new equipment does not need to be added, and the cost is saved.

Description

A kind of preparation method of superconducting wire

Technical field

The invention belongs to technical field of material, be specifically related to a kind of preparation method of superconducting wire.

Background technology

The controlled Magnetic-confinement thermonuclear fusion of full superconduction can (tokamak) generation technology be one of strategic new energy technology of human future sustainable development.Just because of abundant resource and the advantages of environment protection of controllable nuclear fusion energy, it is acknowledged as most probable and solves following global energy crisis, promotes the effective desirable energy of human social.At present, significant for promoting controlled fusion energy basic science development and engineering progress by the startup of the international thermonuclear fusion experimental reactor plan (ITER) of multinational participation, China became a full member of ITER and planned in November, 2006.2010, the developing direction that national medium-term and long-term emphasis is supported was clearly classified " superconduction magnetic confinement nuclear fusion technology " as in the strategical planning that China works out.

Large scale superconducting magnet is the key of full superconduction controllable magnetic constraint fusion reactor, and its major function is that superhigh temperature (6,000 ~ 10,0,000,000 ℃) plasma confinement, in magnetic condenser, is realized to controlled nuclear fusion reaction.In ITER design, high field magnet (TF and CS) needs to produce very high magnetic field (11.8T), bears huge Lorentz force simultaneously, and this magnet adopts Nb at present ₃the coiling of Sn superconductor.But, following demonstration reactor and commercial stack operation parameter (magnetic field >15T, electric current >100kA, carrying >150 ton/rice, power >2GW) far above current ITER design parameter, the stress/strain that large Lorentz force produces causes Nb ₃sn superconductor performance degradation problem becomes particularly serious, is difficult to meet the requirement of high field super coil stress/strain tolerance limit.Therefore, seeking to have the more high field magnet superconductor of excellent comprehensive performance is the basic problem that must solve in following controllable magnetic constraint HCSB-DEMO and commercialization process.With Nb ₃sn compares, Nb ₃al superconductor has higher critical magnetic field and characteristic is allowed in better strain, is following magnetic confinement fusion heap, the especially ideal chose of demonstration reactor stage high field magnet.

Nb ₃after the Al that the preparation of Al superconducting wire is is 1:3 by sectional area ratio and Nb are compound by machinery, processing growth line, then through Overheating Treatment, makes the Al of melting to solid phase Nb diffusion, and reaction generates Nb ₃al superconducting wire.In presoma conductive line fabrication, the complex method of Al and Nb can adopt tiretube process or coiling method.The former is inserted into Al rod in Nb pipe, be then made by drawing single plug, and the latter reels Al paper tinsel and Nb paper tinsel centered by Nb rod, is then made into single plug by drawing.Due to Nb ₃al superconductor mainly generates to solid phase Nb diffusion by the Al of melting, and course of reaction is as follows:

Nb（s）+Al（l）→NbAl ₃+Nb→Nb ₂Al+Nb→Nb ₃Al。

So compared with tiretube process, in coiling method, the diffusion length of Nb and Al is shorter, easier complete reaction generates Nb ₃al superconductor.

But, because the hardness of Al and Nb differs very large, in the long line course of processing, there will be the unmatched problem of machining deformation.In coiling method, be to be 1:3 by Thickness Ratio Al paper tinsel and Nb paper tinsel are reeled, because the hardness of Al is less, distortion is very fast, and when being worked into after certain length, in the cross section of wire, will to be less than be 1:3 to the Area Ratio of Al and Nb, therefore,, in Al and Nb course of reaction, cannot generate Nb completely ₃al, but there is remaining Nb.

Summary of the invention

The object of the present invention is to provide a kind of preparation method of superconducting wire, solved prior art because the distortion of Al paper tinsel and Nb paper tinsel is not mated, cause Nb ₃in the Al coiling method course of processing, the Area Ratio of Al and Nb is less than 1:3, thereby cannot generate Nb completely ₃the problem of Al.

The concrete technical scheme of the present invention is: a kind of preparation method of superconducting wire, comprises the steps:

The first step, makes compound bar, centered by Nb rod, the Nb paper tinsel that is 3:1 by Thickness Ratio and Al Alloy Foil are reeled, and the diameter after coiling is not more than the internal diameter of Nb pipe, and pack in Nb pipe, then carry out drawing processing with the speed of 5 ~ 20 meters per minute, be prepared into Nb/Al alloy compound bar;

Second step, assembles and seals, and will be no less than two Nb/Al alloy compound bar and pack in Cu canning tube, and adopt the mode of welding by the sealing of Cu canning tube, forms composite ingot body;

The 3rd step, hot-extrudable processing waits composite ingot body static pressure processing under the pressure of 4000kN ~ 6000kN, then preheat 200 ℃ ~ 600 ℃, and in 4000kN ~ 40, under the thrust of 000kN, carry out hot-extrudable processing with 1m ~ 10m speed per minute, obtain the composite bar of Cu jacket.

The 4th step, drawing processing, carries out the drawing processing of multi-pass by composite bar with the speed of every time 15% ~ 20% deformation rate and 1 ~ 10 meter per minute, obtains superconducting wire.

Feature of the present invention is also,

Al Alloy Foil is Al-Mg Alloy Foil, and wherein Al is 500:1 ~ 10:1 with the amount of substance ratio of Mg.

The invention has the beneficial effects as follows: the Al Alloy Foil that adopts hardness to approach metal Nb replaces Al paper tinsel, make Nb by the method for reeling ₃single plug of Al presoma wire, because Al Alloy Foil is close with Nb paper tinsel hardness, is making Nb ₃in Al process, deformation is consistent, makes the Area Ratio of Al Alloy Foil and Nb paper tinsel remain 1:3, thereby has guaranteed that Al element and Nb element generate Nb completely ₃al, and without increasing new equipment, saved cost.

Embodiment

Below in conjunction with embodiment, the present invention is described in detail.

The preparation method of a kind of superconducting wire of the present invention, comprises the steps:

Wherein Al Alloy Foil is Al-Mg Alloy Foil, and Al is 500:1 ~ 10:1 with the amount of substance ratio of Mg.

Claims

1. a preparation method for superconducting wire, is characterized in that comprising the steps:

Second step, assembles and seals, and will be no less than two described Nb/Al alloy compound bar and pack in Cu canning tube, and adopt the mode of welding by the sealing of Cu canning tube, forms composite ingot body;

The 3rd step; hot-extrudable processing; described composite ingot body is waited to static pressure processing under the pressure of 4000kN ~ 6000kN; then preheat 200 ℃ ~ 600 ℃; and in 4000kN ~ 40; under the thrust of 000kN, carry out hot-extrudable processing with 1m ~ 10m speed per minute, obtain the composite bar of Cu jacket;

The 4th step, drawing processing, carries out the drawing processing of multi-pass by described composite bar with the speed of every time 15% ~ 20% deformation rate and 1 ~ 10 meter per minute, obtains superconducting wire.

2. the preparation method of a kind of superconducting wire as claimed in claim 1, is characterized in that: described Al Alloy Foil is Al-Mg Alloy Foil, and wherein Al is 500:1 ~ 10:1 with the amount of substance ratio of Mg.