# US 2014/0155270 A1 · NbTi superconductor with reduced weight

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- Number: US 2014/0155270 A1
- Document ID: US20140155270A1
- Status: Published application
- Kind: A1
- Application number: 13/847,497
- Filed: 2013-03-20
- Published: 2014-06-05
- Earliest claimed: 2012-04-11
- Assignees: Bruker EAS GmbH
- Inventors: Andreas Szulczyk
- Web page: https://patentgrep.com/patent/US20140155270A1

## CPC

- H01B 12/10: Multi-filaments embedded in normal conductors
- H10N 60/20: Permanent superconducting devices
- H10N 60/0156: {of devices comprising Nb or an alloy of Nb with one or more of the elements of group IVB, e.g. titanium, zirconium or hafnium}
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR

## Abstract

A superconducting wire (12), containing NbTi superconducting material and Cu, comprising a multiplicity of hexagonal elements, which, as seen in cross-section perpendicular to the longitudinal direction of the superconducting wire (12), have an at least approximately hexagonal outside contour is characterized in that at least a portion of the hexagonal elements is constituted as Cu—Al composite elements (3), wherein, in cross-section perpendicular to the longitudinal direction of the superconducting wire (12), the Cu—Al composite elements (3) are each constituted with an Al core (4) and a Cu sheath (5) that surrounds the Al core (4). The NbTi superconducting wire is thereby stabilized and has low weight as well as a reduced risk of crack formation during manufacturing, especially during wire drawing.

## Claims

### Claim 1

A superconducting wire, the wire comprising:
NbTi superconducting material; and
a multiplicity of hexagonal elements, wherein, as seen in cross-section perpendicular to a longitudinal direction of the superconducting wire, said elements have a substantially hexagonal outer contour and at least a portion of said hexagonal elements is constituted as Cu—Al composite elements, wherein cross-sections of said Cu—Al composite elements each extend perpendicular to said longitudinal direction of the superconducting wire, said Cu—Al composite elements having an Al core and a Cu sheath that surrounds said Al core.

### Claim 2 (depends on 1)

The superconducting wire of claim 1, wherein, as seen in cross-section perpendicular to said longitudinal direction of the superconducting wire, the superconducting wire has at least three Cu—Al sectors, each Cu—Al sector having a multiplicity of contiguous Cu—Al composite elements, wherein said Cu—Al sectors are azimuthally spaced or disposed in an azimuthally evenly distributed fashion.

### Claim 3 (depends on 2)

The superconducting wire of claim 2, wherein at least three Cu—Al sectors border a central Cu—Al sector, said control Cu—Al sector having a multiplicity of contiguous Cu—Al composite elements, is disposed at a center of the superconducting wire and has a cross-section extending perpendicular to said longitudinal direction of the superconducting wire.

### Claim 4 (depends on 1)

The superconducting wire of claim 1, wherein the superconducting wire, as seen in cross-section perpendicular to said longitudinal direction of the superconducting wire, has at least three mutually separated Cu—Al clusters, each Cu—Al cluster having a multiplicity of contiguous Cu—Al composite elements.

### Claim 5 (depends on 1)

The superconducting wire of claim 1, wherein a portion of said hexagonal elements is constituted as NbTi elements, said NbTi elements each having one or more NbTi filaments.

### Claim 6 (depends on 5)

The superconducting wire of claim 5, wherein said NbTi elements each have a Cu matrix and/or a Cu enclosure.

### Claim 7 (depends on 5)

The superconducting wire of claim 5, wherein, as seen in cross-section perpendicular to said longitudinal direction of the superconducting wire, the superconducting wire has at least three NbTi sectors, each NbTi sector having a multiplicity of contiguous NbTi elements, wherein said NbTi sectors are azimuthally spaced.

### Claim 8 (depends on 1)

The superconducting wire of claim 1, wherein, as seen in cross-section perpendicular to said longitudinal direction of the superconducting wire, the superconducting wire has a central region which contains Al.

### Claim 9 (depends on 8)

The superconducting wire of claim 8, wherein said central region has a multiplicity of contiguous Cu—Al composite elements.

### Claim 10 (depends on 8)

The superconducting wire of claim 8, wherein a shaped tube or a Cu shaped tube delimits said central region.

### Claim 11 (depends on 1)

The superconducting wire of claim 1, wherein the superconducting wire has a sleeve or a Cu sleeve into which multiple mutually separated NbTi substructures are embedded, each NbTi substructure having one or more NbTi filaments.

### Claim 12 (depends on 11)

The superconducting wire of claim 11, wherein said NbTi substructures are azimuthally evenly distributed.

### Claim 13 (depends on 11)

The superconducting wire of claim 11, wherein said NbTi substructures are disposed at a same radial distance from a center of the superconducting wire.

### Claim 14 (depends on 11)

The superconducting wire of claim 11, wherein said NbTi substructures are distributed at two or more radial distances, six or more NbTi substructures being at a same radial distance from a center of the superconducting wire.

### Claim 15 (depends on 1)

The superconducting wire of claim 1, wherein the superconducting wire comprises an outer enclosing tube or a Cu enclosing tube.