Aluminum stabilized superconductor with Cu and Mg

Details Aluminum stabilized superconductor with Cu and Mg Aluminum stabilized superconductor with Cu and Mg

1998-04-23

2001-07-03

Gaffin, Jeffrey (Department: 2841)

Electricity: conductors and insulators

Conduits, cables or conductors

Superconductors

C505S231000, C505S704000, C505S887000

Reexamination Certificate

active

06255596

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a superconductor, and particularly to an aluminum stabilized superconductor which is excellent in mechanical strength as well as in thermal and electrical stability, and which is used suitably for superconducting magnet.
BACKGROUND OF THE INVENTION
Heretofore, a superconducting lead wire prepared by embedding a superconducting filament such as a Nb—Ti alloy bar into copper matrix has been employed as a conductor for superconducting magnet.
Such superconducting lead wire as described above is manufactured in accordance with, for example, the following manner. First, a Nb—Ti alloy bar is inserted into a copper tube to produce a composite billet, a Cu/Nb—Ti composite bar is produced in accordance with hydrostatic pressure extrusion, and then diameter of the resulting composite bar is reduced by wire drawing process. Furthermore, a plurality of Cu/Nb—Ti composite bars are made up into a bundle, and a copper or a copper alloy tube is again filled with the resulting bundle to prepare a composite billet, and thereafter a superconducting single wire is produced in accordance with the above-mentioned process. Then, a required number of the superconducting single wires are stranded with each other thereby to manufacture a superconducting lead wire.
A superconductor is prepared by including a pure aluminum which is covered with a Cu—2Ni alloy which is used as a cladding material disposed under a superconducting strand composed of a plurality of the Cu/Nb—Ti superconducting single wires, and coating these materials with copper used for stabilization. The superconductor thus constituted exhibits excellent mechanical strength.
Moreover, another conventional aluminum stabilized superconductor has been disclosed in Japanese Patent Application Laid-Open No. 5-74235. This aluminum stabilized superconductor has such structure wherein a superconducting strand composed of a plurality of Cu/Nb—Ti superconducting single wires is covered with an aluminum alloy for stabilization which is prepared by adding a predetermined amount of Cu and Si to pure aluminum, respectively, for increasing mechanical strength of the superconductor.
However, according to the former conventional superconductor, it is difficult to achieve light weight and downsizing thereof, because the stabilizing material (stabilizer) is made from copper and there is use of a cladding material.
On the other hand, according to the latter conventional superconductor, although light weight and downsizing thereof can be achieved, it is insufficient in mechanical strength as well as in thermal and electrical stability, because an adding amount of Cu and Si is not suitable, respectively.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide an aluminum stabilized superconductor having high mechanical strength as well as exhibiting good thermal and electrical stability while achieving light weight and downsizing thereof.
According to the first aspect of the invention, an aluminum stabilized superconductor, comprising:
a superconducting wire material prepared by embedding superconducting filaments in copper or a copper alloy matrix; and
an aluminum-stabilizing material covering the circumference of said superconducting wire material;
the 0.2% proof stress of the aluminum-stabilizing material is 4 kgf/mm
2
or more at room temperature and 250 or more of residual resistance ratio wherein said 0.2% proof stress is a stress, such as that applied in a tension test, that causes a small permanent deformation of 0.2% in the material; and
the aluminum-stabilizing material being an aluminum alloy containing 10 to 100 ppm of Mg, and the remainder of Al and unavoidable impurities.
According to the second aspect of the invention, An aluminum stabilized superconductor, comprising:
a superconducting wire material prepared by embedding superconducting filaments in copper or a copper alloy matrix; and
an aluminum-stabilizing material covering the circumference of said superconducting wire material;
the 0.2% proof stress of the aluminum-stabilizing material is 4 kgf/mm
2
or more at room temperature and 250 or more of residual resistance ratio wherein said 0.2% proof stress is a stress, such as that applied in a tension test, that causes a small permanent deformation of 0.2% in the material; and
the aluminum-stabilizing material being an aluminum alloy containing 0 to 120 ppm of the sum of contents of Si and Cu, and the remainder of Al and unavoidable impurities.
According to the third aspect of the invention, An aluminum stabilized superconductor, comprising:
a superconducting wire material prepared by embedding superconducting filaments in copper or a copper alloy matrix; and
an aluminum-stabilizing material covering the circumference of said superconducting wire material;
the aluminum-stabilizing material having 4 kgf/MM
2
or more in 0.2% proof stress at room temperature and 250 or more of residual resistance ratio; and
the aluminum-stabilizing material being an aluminum alloy containing 20 to 100 ppm of the sum of contents of Mg and Cu, and the remainder of Al and unavoidable impurities.


REFERENCES:
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patent: 5-74235 (1993-03-01), None
Matweb material information sheet, alloys of aluminum and magnesium, www.matweb.com\GetCompMatis.asp.*
Matweb material information sheet, aluminum 1199-O, www.matweb.com\specificmaterials.asp?bassnum=MA1190&group=.*
“D1-12” The 50thAutumn 1993 Low Temperature Engineering—Superconductor Society meeting, p. 86. (see English translation).
S. Suzuki, et al, “Development of Aluminum Stabilized NbTi/Cu Superconductor,” The Hitachi Densen, Dec. 1982, No. 2, pp. 57-62.

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