JPS5897206A - Method of producing compound superconductive conductor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a method for producing a metal superconductor.

Diffusion heat treatment 31 (: The structure of the compound superconducting conductor produced before diffusion heat treatment consists of the superconducting component metal composite material that forms the compound superconductor through the diffusion heat treatment, the stabilizing material, and the intervening area between these two materials. It is a composite body consisting of a diffusion barrier material. For example, production of a metal superconducting conductor by Bron, Lee Hoen, et al. The superconducting constituent metal composite and the stabilizing material O are coordinated with Wb or Ta, which has diffusion barrier properties, to form a composite, and this composite is made into an extruded billet.It forms Nb58n. Diffusion heat treatment 1; Ou of the stabilizing material is 0u-Iiin metal ζ
In order to prevent contamination, N1 or T&, which does not react with Ou and has diffusion barrier properties, is used as a barrier material at the interface with the metal Ou.

General ζ: Both the superconducting constituent metal composite material and the stabilizing material of the extruded billet have 1-metal processing fibers.

For example, a 0u-an alloy 1ii1 knee Wb rod-like body is inserted through plastic processing such as elongation C; thus, the composite sound of the processed structure created and the plastically worked Cu rod of the stabilizing material are obtained. Therefore, it is preferable that the boundary between the two (=coordination) and the Nb tube of the diffusion barrier material also be plastically worked fabricated fibers (-).
If the Nb tube of the diffusion barrier material of i/k is not a processed structure but a cast fiber, the processing stress distribution of the composite 1; non-uniformity will occur;
The Nb pipe with a cast structure has undergone unbalanced processing.
This is because there is a risk of non-uniformity in the thickness of the Nb tube, and the Nb tube also has a processed structure, and when processing a composite structure such as extrusion, the Nb tube cannot undergo elaborate processing. Non-uniform thickness will not occur.

However, manufacturing superconducting conductors for large conductors (= is inevitable (two large diameter extrusion billets are required, and accordingly, a large diameter thick inner pipe for the barrier material is required. The second method is to forge an ingot and use a swager or Biachi, or to make a thick inner tube from a forged plate by forming and welding.
It requires a large amount of man-hours and the shaking work is complicated and difficult. Therefore, conventionally, a large-diameter pipe was made by hollowing out the center of a large-diameter ingot of Wb or Ta.
Cu-8n)-Nbt (= A billet is made by arranging the fire suppressing diameter pipe J, but since the large diameter pipe J has a cast structure, when it is extruded, as shown in Figure 1 (; of the pipe J) Thickness ζ: In order to prevent this from becoming uneven and causing tears due to subsequent processing and losing its function as a barrier material, the wall thickness of the hollowed out large-diameter pipe was set to an inappropriate 1:1!jL<t, ing.

The present invention was made in consideration of the ridges, and it is easy to make billets (2) in which the barrier material to be incorporated is a large diameter pipe having processed braided wires and having an appropriate thickness. The purpose is to develop a composite consisting of a superconducting constituent metal composite that forms a compound conductor through diffusion heat treatment, a stabilizing material, and the interface between the composite and the stabilizing material (two intervening diffusion barrier materials). A method for producing a metal compound superconducting conductor of a predetermined shape (double drawing processing and then diffusion heat treatment ζ) is used as the above-mentioned composite.

A cylindrical body made of one or both of a laminated cylindrical body of thin metal plates having diffusion barrier properties and a cylindrical body formed by combining two ring-shaped metal rod bodies is made, and the inside or outside of the cylindrical body is This is a method for producing a compound superconducting conductor, characterized in that a composite is used in which one of the above-mentioned superconducting constituent metal composites (ζ) and a stabilizing material (ζ) are disposed.

For example, the production of Nb2Sn compound superconducting conductor (=
Figure 1 (; showing the cross section of an extruded billet is made.

Inside the Nb cylindrical body J of the diffusion barrier material (Cul of the bistabilizing material)
outside the cylindrical body [1: superconducting constituent metal composite material (Ou-
An) - A complex in which composite thin wire groups of -Nbl are coordinated is prepared, and this is made into an extrusion billet and subjected to line drawing processing such as hot extrusion wire drawing processing, followed by diffusion heat treatment.

The above-mentioned Nb cylindrical body J as a diffusion barrier material is made by stacking thin-walled tubes with gradually increasing diameters made by winding Nb # plates to form a multi-tube J, that is, a diffusion barrier layer, as shown in Figure 3. The diffusion barrier layer may be a coiled Nb sheet; the Nb sheet may be wound a required number of times to form a cylindrical body. In each case, the end of the book was made with a 9-4 mark without the need for welding. During hot extrusion of billets (
: These multiple tubes J are joined to each other (two-metallic) and integrated.

If the joint is insufficient and the multiple pipes are not integrated,
The subsequent line drawing processing results in non-uniform processing, and the multiple tubes, that is, the barrier material, is processed non-uniformly and loses its diffusion barrier properties. If multiple Nb tubes are interposed, the metallic bonding of the multiple tubes becomes even easier.In other words, the integration of the Nb multiple tubes as a diffusion barrier material is achieved during the process of manufacturing the superconducting conductor.

Therefore, the manufacturing method of the present invention has great effects for manufacturing large cross-section, long compound superconducting conductors for large conductors.

In the present invention, the diffusion barrier material may be Nb or Ta, and the stabilizing material may be pure copper or pure aluminum, and extrusion processing is performed by hot extrusion when the stabilizing material is pure, and cold extrusion when the stabilizing material is pure aluminum. The thin layer of processable metal may also be a copper box or copper plating.

Next, two examples will be described.

Example / To make an extruded billet as shown in the cross section of Fig. Different cylindrical shapes (= processed, each circular pottery concentric
13, and after cleaning the multiplex tube 3, insert two pure copper tubes with an outer diameter of -〇〇〇 and inner diameter of 1ILjt-, and then Nb bar-3jO
Insert the book, insert the multi-tube 3 and (Ou-8n)-Wb rod into the gap between the metal groups (2) to create a composite with a filling rate of DE! This was then welded in a vacuum to make an extruded billet.The billet was hot extruded to make a composite round bar with a diameter of J. Using this foreshadowing, the binding of the Nb Tatomi pipe, which is a diffusion barrier material, was examined. , multi] [f is perfect (the wall thickness of the two-joined, layered and integrated pipe is almost constant from 11 to 1200 mm). A hexagonal wire with many diameters J of this hexagonal wire
Q Q bite~diameter/l! - Copper pipe cage: insert and extrude billet, diameter core fi (- extrusion next (knee female x 1! The thickness of the square wire (= processed, but of the diffusion barrier material) Ib is II ~ 1
No tears were observed in 7 samples, and there was no contamination of the stabilizing material O from the residual resistance ratio.

Embodiment λ Square wire 1 = Jl of 100 pieces of copper wire, cut JjQyua into a long piece to make a rectangular segment. Diagram: As shown in a partially enlarged view (2. Outer diameter - 00 lie, inner diameter/II bite length J! σ) The center of the bronze pipe (2 diameter/JJ pure copper rod/) is arranged. , the connection between the bronze tube and the pure copper rod 111J [i 2, thickness / +w and the inner diameter of the bronze tube (2 is approximately equal to the T tube J inserted, and the above-mentioned copper plating 7 segment - 〇The required number of billets were arranged in a lump along the two inner wall sections of Tavj (; After inserting, welded both ends in JLu to make an extrusion billet, and extruded at a diameter of 118PcPRm≦−low extrusion ratio, but Ta The segments were metallic (two perfect 4: fused and integrated.

As is clear from the above-mentioned embodiments, according to the present invention, an integrated large-diameter tube diffusion barrier material is formed using an extrusion process in the manufacturing process. This method is effective as a method for producing compound superconducting conductors for magnets.

[Brief explanation of drawings]

Figure 41/a is a th-direction view of an extruded billet according to the conventional method (2), and Figure 1 is a cross-sectional view after extrusion processing. FIG. 1 is a perspective view of a multilayered tube of a barrier material, and FIG. 1 is an enlarged view of a part of the cross section of an extruded billet according to the present invention (an example of a second embodiment). Material 3: Diffusion barrier material 4t: Bronze tube j: Ta thin inner tube 4: TIL segment 7 di-copper plating (

Claims (2)

[Claims] (1) A superconducting constituent metal composite that forms a compound superconductor by diffusion heat treatment, a stabilizing material, and an interface between the superconducting constituent metal composite and the stabilizing material lTi1 (= composite consisting of an intervening diffusion barrier material) A method for producing a compound superconducting conductor is to reduce the area of the metal into a predetermined shape and then perform a diffusion heat treatment; A cylindrical body consisting of one or both of the rod-shaped body and the circular body formed by combining the rod-shaped body with an annular shape (;
= A method for manufacturing a compound superconducting conductor, characterized in that a composite is used in which the above-mentioned superconducting constituent metal composite is arranged and the other (: a stabilizing material is arranged). (2) The above-mentioned cylindrical body is formed by inserting a thin layer of metal or a thin layer of a highly workable metal. A method for producing a compound superconducting conductor according to item 1.