Multi-layer tape nanostructure composite based on superconducting niobium-titanium alloy

FIELD: physics; conductors.

SUBSTANCE: invention relates to making composite superconductors with improved current-carrying capacity and can be used, particularly, for making superconducting magnet windings. According to the invention, the multi-layer tape nanostructure composite based on a superconducting niobium-titanium alloy contains alternating layers of niobium and niobium alloy-(25-45) wt % titanium, with layer thickness of not more than 50 nm. The thickness of each niobium layer is 50-70% of the alloy layer thickness.

EFFECT: obtaining a composite with critical current density of 58000 A/cm2 in a magnetic field with flux density of 6 T.

2 cl, 3 tbl

 

The invention relates to the field of creation of new nanostructured multilayer composite superconductors on the basis of niobium alloys with improved current-carrying abilities and can be used, in particular, to create windings of superconducting magnets.

Currently great interest are materials containing alloys of Nb-Ti and Nb-Zr. Multilayer planar nanostructured composites based on such alloys are promising for the creation of superconducting materials with high current-carrying capacity. The presence of the tape superconductor planar, parallel layers, the thickness is 10-100 nm, and is thus comparable with the coherence length of the superconductor, allows you to use the effect of a long, flat surface that is parallel to the external magnetic field, pinning (fixing) of Abrikosov vortices and, therefore, the value of the critical current density.

Known multilayer composite [patent US 5230748, H01L 39/24, July 19, 1991], in which the superconducting layers of alloys of the system Nb-Ti-Zr-V-Hf-Ta at the final stage of manufacture of a superconductor is produced by diffusion annealing of the composite of alternating layers of these metals or their alloys, and the thickness of the normal and superconducting layers, formed during the annealing must be less than 1000 nm.

However, for diffuzionnogo annealing of the composite leads to the complexity of the process.

Known also two patents related to obtaining flat superconductors, in which the superconducting layers are flat across the entire width of the tape. In the first [US 4729801, H01L 39/24, 1986] proposed to apply a superconducting connection on a moving flat substrate by electron beam deposition, in the second [JP 1212747, B22D 11/01, 1988] - the rough copper substrate through a molten superconductor.

However, although both these methods allow to obtain thin layers of superconductor and to achieve high critical current density, but they do not provide a multilayer conductors capable of carrying large total shock, because this requires that these layers were as much as possible.

Famous adopted for the prototype, multilayer tape nanostructured composite-based alloy niobium-titanium containing alternating layers of niobium and niobium alloy, titanium, consisting of 64000 layers of niobium and an alloy Nb-50 wt.% Ti with an average thickness of each layer of 2.5 nm [Miechow, Vperiod, Vigneau, Wensveen, Isabekova "Anisotropy density of the superconducting critical current in layered nanostructured composites containing layers of the alloy Nb-50% Ti" // "Science", 2008, №6, p.35-38]. Flat layers of superconducting alloy Nb-50 wt.% Ti, the thickness of which is equal to 2.5 nm, comparable with the coherence length of the superconductor, which would allow auth to use the effect of a long, flat border between the layer of niobium and a layer of the alloy Nb-50 wt.% Ti, parallel external magnetic field, the pinning of Abrikosov vortices and, therefore, the value of the critical current density.

However, the critical current density in the above-described superconducting composite does not exceed 4500 A/cm2in a magnetic field of 6 Tesla.

The present invention solves the problem of creating nanostructured composite with significantly higher critical current density, capable of carrying a large total shock.

This object is achieved by the proposed structure of the multilayer tape nanostructured composite based on superconducting alloy of niobium-titanium containing alternating layers of niobium and niobium alloy-titanium, the novelty of which consists in the fact that as the alloy Nb-Ti it contains the alloy Nb-(25-45) wt.% Ti, the thickness of the layer is not more than 50 nm. The thickness of each layer of niobium is 50-70% of the thickness of the layer of alloy.

To stabilize the superconductor outer surfaces of nanostructured composite covered with a layer of copper.

The technical result of the invention is to obtain a superconducting material, the critical current density which is 58,000 A/cm2at 6 Tesla at the optimum thicknesses of the layers constituting the composite.

Table 1 shows the indices of the critical current density at 6 Tesla announced aemula multilayer nanostructured composite depending on the titanium content in the alloy. The thickness of the alloy layer was ~12 nm; the thickness of the layer of niobium - ~8 nm.

Table 2 shows the indices of the critical current density at 6 Tesla claimed multilayer nanostructured composite depending on the thickness of the layer of alloy. The thickness of the layer of niobium was ~67% of the layer of the alloy Nb-30 wt.% Ti.

Table 3 shows the performance of the critical current density at 6 Tesla claimed multilayer nanostructured composite depending on the thickness of the layer of niobium. The thickness of the layer of the alloy Nb-30 wt.% Ti was ~12 nm.

The following examples illustrate, but not limit the invention.

Example 1.

Samples of multilayer tape nanostructured composite in the form of a tape width of 30-40 mm and a thickness of 0.15 mm was obtained, as in the previously described method [Karpov M.I., Grandchildren, V.I., Volkov KG, Bear, NV, I.I. Khodos, Abrosimova G. "the features of the vacuum rolling as a method of producing a multilayer composites with nanometric thicknesses of layers, materials Science, 2004, No. 1, p.48-53] by the method of high-rolling. Each cycle consisted of three successive operations: build the package from source plates, vacuum hot rolling, cold rolling. In the first cycle of the original plates were components of the composite, in the second and subsequent cycles plates obtained in the previous cycle.

First with the Orc composite Nb b-30 wt.% Ti) consisted of 16 niobium foils and 15 foils alloy Nb-30 wt.% Ti. The thickness of the source foils alloy was equal to 0.3 mm, the thickness of each foil niobium was 0.2 mm or 66.7% of the thickness of the alloy foil.

Vacuum rolling in each cycle was performed for 2 passes heated samples up to 900°C and the total compression of 50%. Cold rolling in each cycle was finished to a thickness of 0.3 mm In the third cycle were rolling to the final thickness of 0.15 mm was obtained a composite consisting of 28830 layers of niobium and an alloy Nb-30 wt.% Ti. The estimated thickness of the alloy layers was equal to 12 nm, the calculated thickness of each layer of niobium was equal to 8 nm, which accounted for 66.7% of the thickness of the layer of alloy. According to scanning electron microscopy estimated thickness of the layers satisfactorily coincided with the measured average thickness of the layers.

After the last rolling all the samples were annealed at 400°C for 3 hours for separation of dispersed particles of α-phase in the alloy layers Nb-30 wt.% Ti.

The critical current was measured at the liquid helium temperature in an external magnetic field up to 7 Tesla with its two orientations: parallel to the plane of the obtained composite (nanolaminate) and perpendicular to the transport current (in this case, the Lorentz force is directed perpendicular to the plane of nanolaminate and is pinning on the interlayer surface)perpendicular to the plane of nanolaminate, and the transport current (in this case, the pinning is and interlayer surface is absent). The critical current density was determined by the ratio of total transport current to the entire cross-sectional area of the composite.

The critical current density of the obtained composite is 58,000 A/cm2in a magnetic field of 6 Tesla.

Example 2.

Same as in example 1, except that before the last rolling of the Assembly of the package is placed between two plates of copper.

Thus obtained composite acquires stabilizing properties.

Example 3.

Same as in example 1, except that the content of Ti in the alloy Nb-Ti was varied from 20 to 50 wt.%. The thickness of the alloy layer was ~12 nm; the thickness of the layer of niobium - ~8 nm. Indicators of critical current density at 6 Tesla obtained multilayer tape nanostructured composite are shown in table 1.

As can be seen from the table, by reducing the content of Ti in the alloy Nb-Ti below 25 wt.% and with increasing Ti content in the alloy above 45 wt.% it was observed a strong decrease of the critical current density

Example 4.

Same as in example 1, except that the layer thickness of the alloy Nb-30 wt.% Ti in the composite was varied from 2.5 to 55 nm. The thickness of the layer of niobium was ~67% of the layer of the alloy Nb-30 wt.% Ti. Indicators of critical current density with 6 T of the obtained multilayer nanostructured composite are shown in table 2.

As the table shows, with increasing layer thickness of the alloy Nb-30 wt.% Ti composite above 50 nm was observed for the to maintain the lowering of the critical current density.

Example 5.

Same as in example 1, except that the thickness of the Nb layer in the composite ranged from 45-75% of the thickness of the layer of alloy. The thickness of the layer of the alloy Nb-30 wt.% Ti was ~12 nm. Indicators of critical current density at 6 Tesla obtained multilayer nanostructured composite are shown in table 3.

As can be seen from the table, by reducing the thickness of the Nb layer in the composite below 50 and above 70% of the thickness of the layer of the alloy was observed a decrease of the critical current density.

The above examples confirm the reception of the multilayered nanostructure composite-based alloy niobium-titanium high at the present stage of the prior art indicator of the critical current density, equal 58000 A/cm2in a magnetic field of 6 Tesla.

Table 1.
№ p/pThe content of Ti in the alloy Nb-Ti, wt.%Indicators of critical current density at 6 T,
A/cm2
12015200
22550500
33058000
4 4549800
55037000

Table 2.
№ p/pThe thickness of the layer of the alloy Nb-30 wt.% Ti composite, nmIndicators of critical current density at 6 T, A/cm2
12.547900
25.057800
31258000
45054300
55522500

2
Table 3.
№ p/pThe thickness of the Nb layer in the composite % of the thickness of the alloy Nb-30 wt.% TiIndicators of critical current density at 6 T, A/cm2
14538400
5055000
36758000
47057600
57541000

1. Multilayer tape nanostructured composite based on superconducting alloy of niobium-titanium containing alternating layers of niobium and niobium alloy, titanium, characterized in that as the alloy niobium-titanium it contains alloy niobium - (25-45) wt.% titanium, the thickness of the layer is not more than 50 nm, the thickness of each layer of niobium is 50-70% of the thickness of the layer of alloy.

2. Multilayer tape nanostructured composite according to claim 1, characterized in that its outer surface covered with a layer of copper.



 

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