JPH0492316A - Manufacture of compound linear material - Google Patents

Abstract

PURPOSE:To improve performance of a compound wire rod by filling the inside of a metal substance consisting of B with a metal substance containing a component A, and arranging a metal substance consisting of C generating no compound with A and B, and applying a surface reduction process followed by heating above reaction temperature of A with B. CONSTITUTION:It is explained provided that A is Sn, B is Nb and C is Ta. An Nb block is an Nb tubular body 1 having a hollow part 2. The hollow part 2 is filled with an Sn tubular body 3 and a non-reactive metal rod 4. A Cu tubular body 5 reacting to Sn is placed in the middle of the Nb tubular body 1 and the Sn tubular body 3. the non-reactive metal actually generates no compound with Sn, Cu and Nb and remains as a metal or an alloy even in the final diffusion process. A surface reduction processing is performed by a normal method to have a prescribed size.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for producing a linear body of a compound such as a brittle intermetallic compound, and is particularly useful for practical applications such as windings of high magnetic field magnets and electric cables. N b s used for magnetic shielding and magnetic shielding
This method is useful as a method for manufacturing superconducting wires such as S n and V z Ga.

[Conventional technology]

The prior art will be explained below using a superconducting wire, which is a notable example of a linear body of a brittle compound.

The A-15 type compound is effective as a winding wire for a superconducting maggot that can flow a large current without resistance and generate a high magnetic field. Examples include NbtSn, Nb5
S i, Nb1A1. , Nb1Ge, Nbz (A!
Ge), VsGa, Nb, Ga, etc. these are,
It is used by forming it into a linear body using Cu as a matrix. Taking NbzSn, which is highly practical, as an example, Sn or Cu-3n is put into a Nb pipe and processed, and if necessary, these are filled into a tubular body made of Cu etc. and processed again. , after making it multi-core, it is finally subjected to a heating diffusion reaction to form Nb and Sn. Sn required for diffusion reaction is
By adjusting the thickness and diameter of the Nb pipe, a sufficient amount of Nb can be supplied and a large-capacity superconducting wire can be obtained.

However, this method has a significantly different machining deformability.
Since b and Sn are processed together, their deformation tends to be unbalanced, resulting in non-uniform line shapes and even wire breakage. Furthermore, in the final process of diffusion heat treatment, reverse kirkendal effects due to volume changes and differences in diffusion rates are observed.
Due to the L effect, defects such as voids and clutter occur inside the compound wire filament, and the mechanical properties of the compound wire filament deteriorate.

[Problem B to be Solved by the Invention] The conventional method for producing a linear compound has the following industrial problems. That is, as described above, the deformation forms of Nb and Sn tend to be unbalanced, and the shape of the compound wire becomes non-uniform. In addition, since defects are included in the compound linear body, the compound linear body can be damaged by distortion during the molding process to be incorporated into practical equipment, or by stress and distortion applied during the use of the equipment. Indicates deterioration of characteristics. In particular, in the case of superconducting wires, large stress and strain are applied to the superconducting wires due to the coiling process to form the magnet and the Lorentz force during magnet operation, resulting in a decrease in critical current density.

[Means and actions to solve the problem]

The present invention provides a method for manufacturing a linear compound body that solves the above problems, and in the method for manufacturing a linear compound body consisting of components A and B, component A is contained in a metal body consisting of B. A metal body made of C that fills the metal body and does not form a compound with A and B is placed inside the metal body containing component A or outside of the metal body made of B, and then subjected to area reduction processing. The first invention provides that the metal containing component A is an alloy of component A and a metal that does not form a compound with metal C, or , the second invention is a mixture or composite of these, where A is Sn, B is Nb, C is Ta, and D
The third invention is that is Cu.

Hereinafter, explanation will be given assuming that A is Sn, B is Nb, and C is Ta.

The Nb block is, for example, an Nb tubular body 1 having a hollow portion 2, as shown in FIGS. 1(a) and 1(b). 1st
In the hollow part 2 of Fig. 2(a), as shown in Fig. 2(a), S
n tubular body 3 and non-reactive metal rod 4 were filled. Figure 2 (
b) is an example in which a Cu tubular body 5 that reacts with Sn is placed between the Nb tubular body 1 and the Sn tubular body 3. Figure 2 (a')
This is an example in which an Sn rod 3' is placed in the hollow part 2 of FIG. 1(a), and a non-reactive metal tubular body 8 is placed outside.

In the above, the Sn tubular body 3 and the Sn rod 3' are pure Sn.
In addition to pure Cu, the Cu tubular body 5 may also be made of an alloy or a mixture of 5n-Pb, 5n-Cu, SnAg, etc.
It may also be u-Ag, Cu-Zr, Cu-Ti, Cu-Zn, etc. Cu tends to cause a diffusion reaction with Sn, and does not substantially react with Nb and the non-reactive metal rod 4 in the process of the present invention. The non-reactive metal rod 4 and the tubular body 8 are made of Ta
, Zr, Hf, Mo, W, Cr, etc. and their alloys,
It is made of SUS, Ta-Zr, Ni-Mo-Cr, etc.

Under the process conditions of the present invention, these non-reactive metals include Sn, Cu
It does not substantially form a compound with Nb and remains as a metal or alloy even in the final diffusion step.

The area reduction process is performed by conventional methods such as rolling, extrusion, drawing, swaging, etc., to obtain a predetermined size.

In order to make NbzSn filaments multicore, a large number of linear bodies with reduced area are bundled, filled into a tubular body made of Cu or the like, and the processing is repeated again. The above-mentioned operations (staring, rolling) are repeated as necessary, and the final linear body is subjected to a diffusion heat treatment. In the structure shown in Figure 2(a), Nb and Sn react directly to produce Nb5sn, so the final shape is as shown in Figure 3(a).
It becomes as shown in . 6 is an NbzSn layer.

Of course, at least one of Nb and Sn may remain. Figure 3(b) corresponds to Figure 2(b), 7 is C
u or Cu-5n layer.

An improved example of the implementation of the present invention is as shown in FIG. 2(c).
A non-reactive metal tubular body 8 is arranged around the outer periphery of the tubular body l. This non-reactive metal does not form a compound with Sn and Nb, and includes Ta, Zr, HE, Mo, W, Cr, alloys thereof, SUS, TaZr, Ni-Mo-C, and the like. The cross section after processing and heat treatment is the third [1a (c
)become that way.

Further, the cross section of FIG. 2(a') after processing and heat treatment becomes as shown in FIG. 3(a').

The final cross section of the compound linear body of the present invention is shown in FIGS.
c) and (a'). That is, the compound filaments shown in FIGS. 3(a) to 3(c) and (a') are dispersed in the metal matrix 9. As mentioned above, the Nb tubular body is coated with Cu, etc., which has lubricating properties, so
The wires can be gathered in Cu as a matrix. Alternatively, A1, Sn, 5n-Pb, Ag, etc. can be extruded and adhered to a compound filament by rolling, plating, thermal spraying, etc., and similarly aggregated in a metal matrix.

As described above, in the present invention, the inside of the Nb tubular body is filled with a non-reactive metal body such as Ta, which does not form a compound and remains as a metal or alloy until the end, so that this non-reactive metal body is machined. It has a reinforcing effect on weak compounds (N
bxSn). Further, according to the present invention, it is possible to improve the large imbalance in deformability between Nb and Sn, so that the wire can be processed uniformly and efficiently. Conventionally, as shown in FIG.
-3n remains, but this central portion 10 exhibits almost no mechanical reinforcing effect. Only by using a non-reactive metal rod 4 in the center as shown in FIG. 3(b),
The mechanical reinforcement effect is improved.

In FIG. 3(c) of the present invention, the brittle Nb3Sn is sandwiched with non-reactive metals from the inside and outside, so that the mechanical reinforcing effect is further improved. In addition, in this structure, when multi-core is formed, the Sn inside does not contaminate the Cu material of the matrix, so Cu can maintain high thermal and electrical conductivity, and can maintain good stability against quenching as a superconducting wire.

〔Example〕

Hereinafter, the present invention will be explained based on Examples.

Example 1 A Nb pipe with an inner diameter of 16 mm and an outer diameter of 22 mm was
Sn with a thickness of 4.5 unn centered on TapJ of the circle φ
A vibrator and a Cu pipe with a thickness of 2.5+11111 were sequentially filled.

This Nb vibrator was placed in a pure Cu vibe with an inner diameter of 22.5 nmφ and an outer diameter of 26 nmφ, and the vibrator was vacuum-sealed and then made into a diameter of 9 mm by hydrostatic extrusion. After drawing this to IIφ, it is filled into a Cu pipe with an inner diameter of 22.5 mmφ, and CI
After P treatment, it was processed in the same way to obtain a diameter of 0.5 am. This wire was heat treated at 620°C for 4 days.

Example 2 In Example 1, 0.2
After wrapping a 5m thick Ta foil twice, the inner diameter is 23am + φ.
It was placed in a pure Cu pipe, and the same processing was performed thereafter.

Example 3 In Example 2, instead of the central Ta rod and the Sn pipe around it, an 11+w+φ Sn rod with a thickness of 2.5 m was used.
The material inserted into the Cu pipe was placed in a Nb vibe, and the same processing was performed thereafter.

Example 4 In Example 1, the thickness of the Sn vibe was changed to 3.0-1 Cu.
The thickness of the pipe was 4.0 mm.

Example 5 In Example 2, the thickness of the Sn pipe was 3.0 mm, and the thickness of the Cu pipe was
The thickness of the pipe was set to 4.0 mm.

Example 6 In Example 3, the outer diameter of the Sn rod was set to 8. OIQrnφ
, the thickness of the Cu pipe is 4. It was set as Otmn.

Comparative Example 1 In Example 1, instead of the central Ta rod and the Sn pipe around it, an 11 mmφ Sn rod inserted into a 2.50 mm thick Cu pipe was placed in a Nb vibe, and the same processing was performed thereafter. provided.

Comparative Example 2 In Example 4, instead of the Ta rod at the center and the Sn vibe around it, an 8 mφ Sn rod was replaced with a 4.0 m thick C
The material inserted into the U-pipe was put into the Nb-pipe, and the same processing was performed thereafter.

For the above wire, the critical current density J in a magnetic field of 4.2 K and 13 T was measured in the cases of 0% strain and 0.3% strain. The results are shown in Table-1.

Table 1 From the above results, this example shows that regardless of the presence or absence of distortion,
All showed larger JC than the comparative example. Example 1~
In No. 3, Sn was excessive compared to Examples 4 to 6, and Jc was large at zero strain, but when strain was added, the difference in J between the two was reduced. Example 2.5 using Ta on the inner and outer surfaces of the superconductor layer
is stable against distortion.

In addition, in the above explanation, as a typical example, N b sS
n [Although the conductive wire was used, as mentioned above, not only other compound superconducting wires but also other intermetallic compound wires such as NbTi, which has excellent strength, wear resistance, and corrosion resistance, and has a shape memory effect,
It can also be applied to high-performance magnetic materials such as SmCo5, Sm2Co, NbAl and TiAl, which have excellent heat resistance.

[Effects of the Invention] As explained above, according to the present invention, in the method for manufacturing a compound linear body consisting of components A and B, a metal body containing component A is filled into a metal body consisting of B, and a metal body consisting of C that does not form a compound with A and B, as component A.
is placed inside a metal body containing A or outside a metal body consisting of B, then subjected to surface reduction processing, and then
Since the heating is performed to a temperature higher than the reaction temperature with the compound wire, productivity is improved and the performance of the obtained compound wire rod is also improved.

[Brief explanation of the drawing]

Figures 1 (a) and (b) are cross-sectional views of the Nb tubular body used to explain the present invention, and Figures 2 (a) to (c) and (a') are
b A cross-sectional view of the hollow part of the tubular body filled with Sn rods, etc., and Figures 3 (a) to (c) and (a') are
Cross-sectional views of compound linear bodies obtained by surface reduction processing and diffusion heat treatment of Nb tubular bodies filled with rods, etc., Fig. 4 (a) to (c), (a
') is a sectional view of a multi-core compound linear body which has been subjected to the diffusion heat treatment, and FIG. 5 is a sectional view of a conventional compound linear body. DESCRIPTION OF SYMBOLS 1...Nb tubular body, 2...Hollow part, 3...S
n tubular body, 3'...Sn rod, 4...non-reactive metal rod, 5...Cu tubular body, 6...Nb3Sn layer,
7...Cu or Cu-3n layer, total...non-reactive metal tubular body, 9...metal matrix, 10.
··Central part. (a) (b) Figure 1 (a) (b) (C)

Claims (1)

[Claims] 1) A method for producing a compound linear body consisting of components A and B, in which a metal body containing component A is filled in a metal body consisting of B, and A and B and the compound are filled. A metal body made of ungenerated C is placed inside a metal body containing component A or outside a metal body made of B, and then subjected to surface reduction processing, and then heated to a temperature higher than the reaction temperature of A and B. A method for producing a linear compound, the method comprising heating. 2) The compound linear body according to claim 1, wherein the metal containing component A is an alloy of metal D and component A that does not form a compound with metal C, or a mixture or composite thereof. manufacturing method. 3) The method for producing a linear compound according to claim 2, wherein A is Sn, B is Nb, C is Ta, and D is Cu.