JPS5828684B2 - NBYSN1-XALX - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a superconductor comprising a Nby Sn 1-xkllx intermetallic compound.

There are two types of intermetallic superconducting magnet materials currently in use: Nb3Sn and V3Ga, and these materials are manufactured by a gas phase reaction method or a solid state reaction by diffusion.

The properties of the above-mentioned known superconductors are listed in Table 1 below.

Known Nb3Sn j■3G having the above characteristics
Since the critical magnetic field value of a is 220 KG, the maximum magnetic field that can be generated by superconducting magnets manufactured using these known materials is 150 KG at 4.2°.

However, in order to generate a higher magnetic field of about 200 KG, it is impossible to achieve this with the known superconductor wires as mentioned above, and it is desirable to develop a superconductor material that can generate a higher critical magnetic field (at least 200 KG or more). 1 has been written.

On the other hand, in recent years several types of superconductor materials with critical temperatures above 18 DEG have been developed, some of which have the desired high critical magnetic fields as mentioned above.

Examples of these include Nb5(Alo, 75GeO
,2s)”4]OKG and Nb5A7: 300 K
I can list G.

However, since these materials can only be manufactured by high-temperature treatment at 1500° C. or higher, they cannot have a high critical current sonic intensity, which is another important element required for practical superconducting magnet materials.

For these reasons, the superconducting material having the above composition cannot be put to practical use at present.

The method of the present invention relates to a method for producing a superconductor which overcomes the drawbacks of the known materials as described above and is improved. Original alloy Cu1-y'(5n1-x
``AI!
It is combined with a niobium-based alloy containing one or more of titanium, hafnium or tantalum in the range of 5 to 10 atoms, processed into a tape or wire rod by rolling, wire drawing, etc., and then 450°~1000
Annealed at a temperature of °G for 10 minutes to 1000 hours to obtain β-W type NbySn1xAlx (y = 3~4, X-1~3
This is a method for producing a superconductor characterized by forming an intermetallic compound with 0 atoms φ).

Although the wire manufactured by the method of the present invention does not show a large change in the critical temperature, the critical magnetic field is
250KG or more, if x=5 atomic charges, 300KG can be obtained.

Moreover, because this wire is manufactured using a diffusion method at a relatively low temperature, it was confirmed that the same high critical current capability as Nb3Sn was maintained in a high magnetic field rather than a low magnetic field. .

In addition to the above, the method of the present invention has a feature that it is also effective in manufacturing pulsed magnets and multicore wires for alternating current.

Therefore, the superconductor wire produced by the method of the present invention has a
It can be used as a superconducting magnet material that can generate ultra-high magnetic fields reaching as high as 0.00 KGK.

In the present invention, after rolling and wire drawing, Sn,
It may be immersed in a 1-x'Alx'(x' = 0.1 to 60 atomic %) bath, and several examples of such cases will be shown in Examples below.

Specific examples of the method of the present invention will be described in detail below, but the present invention is not limited to these examples.

Example 1 Cu1-y'(5n1-x"Ad?)y with a diameter of 12 mm
'(y' - 18 atoms, 5 atoms of goo) Three longitudinally penetrating holes with an inner diameter of about 41n7It are provided in the alloy rod, and after inserting a niobium rod with a diameter of 4mm into each hole, this combination is made. The body is wire-drawn using 1 with an outer box of 0.25 mm.
This was heat-treated in vacuum at 750°C for 300 hours, and a β-preform intermetallic compound NbySn was formed near the boundary between the base material niobium rod and the combined Cu-8n-A1 alloy.
1-XAlX (y-3 to 4, X-25 atoms) was formed.

The superconducting property of the wire treated in this way is Tc= ] 7°
It was KHc2-300KG.

Example 2 Cu1-y/(Sn,-xl/
Three holes with an inner diameter of about 4 mm passing through the longitudinal direction were formed in the alloy, and a niobium rod with a diameter of 4 mm was inserted into each hole. After that, the wire rod obtained by wire drawing the assembled body with 1 having an outer diameter of 0.25 mm was heated to molten 5n1-X' at 500°C.
By immersing in an AlX'(x'-5 at. Near the boundary, β-preform NbySnl-xAlx [
y-3 to 4, X=5 atoms] An intermetallic compound was formed.

The superconducting properties of the obtained wire were Tc-175°, Hc2
=300KG.

Example 3 Cu1-y'(Sn, -yeAlh
l) In a y'(y' = 10 atoms, atoms - 5 atoms φ) alloy rod, a hole with an inner diameter of approximately 7 mm is provided that penetrates in the longitudinal direction, a niobium rod with a diameter of 7 mm is inserted into the hole, and the outer diameter is The diameter is O,] my
The wire rod obtained by drawing with 1 that becomes n is woven into 7 strands and
Melting 5n1-X/Alx' at 20°C (X'=5 at.%
) in an inert gas such as argon gas,
By heat treatment at a temperature of 750° C. for 150 hours, β-preform NbySnl-XAlX (y-3 to 4, x
= 5 atoms) An intermetallic compound was formed.

The superconducting property of the wire treated in this way is Tc-17°K.
, Hc2-300 KG.

Example 4 Cu4-y'(Sn1-4hlx") y with a diameter of 12
'(y'-10 atomic force, l=atomic force) A hole with an inner diameter of about 7 mm passing through the longitudinal direction is provided in the alloy rod, and the hole has a diameter of 7 mm.
Insert a niobium rod between the wires and draw the wire to an outer diameter of 0.1 mm.The resulting wire is braided into three strands and placed in a 500°C molten 5n1-xklx'(x'-5 atomic steam) bath. Soak,
This was inserted into a copper pipe with an inner diameter of approximately 0.25 mm, passed through a die and subjected to drawing and/or wire drawing, and then heat treated in a vacuum at a temperature of 700°C for 200 hours to combine it with the base material of niobium. β-former type NbySnlXAlX (y-3 to 4,
(X=5 atomic %) an intermetallic compound was formed.

The superconducting properties of the wire treated in this way were Tc=17° and Hc2-300KG.

Examples 5 to 20 Table 2 shows examples in which each variable was varied sharply using any of the methods of Examples 1 to 4.

The superconducting properties obtained from these results are shown in Figures 1 and 2.

As is clear from these results, when the method and variables are changed, the critical temperature and critical magnetic field are
, x=o to 50 atoms), and was found to be almost independent of methods and variables.

Table 3 shows the critical temperature and critical magnetic field depending on the change in X of NbySn]-xAlx.

[Brief explanation of the drawing]

Figure 1 shows β-W type NbySn 1-xAlx (y =
3-4, a graph showing the composition dependence of the critical temperature of
It is a graph showing the composition dependence ratio of the critical magnetic field of x (y=3 to 4, X=O to 1).

Claims (1)

[Claims] 1. Ternary alloy Cu1 consisting of copper, tin button and aluminum
-y'(5n1-yeAlbt') y'(y'= 0
．． 05-30 atoms, z=0. ] to 60 atoms φ] and metallic niobium or titanium within the range of 0.05 to 10 atoms φ. A niobium base metal containing one or more of zirconium, hafnium, or tantalum is combined into an integral body, processed into a tape or wire by rolling, wire drawing, etc., and then heated at 450° to 1000°C. 10 minutes at a temperature of ~1
After annealing for 000 hours, βW type NbySn1-xMx (y
= 3 to 4, X-1 to 30 atomic %).