Making of bismuth 2212 superconducting wire or tape

Details Making of bismuth 2212 superconducting wire or tape Making of bismuth 2212 superconducting wire or tape

1998-11-05

2001-06-05

Speer, Timothy M. (Department: 1772)

Metal working

Method of mechanical manufacture

Electrical device making

C505S230000, C505S232000

Reexamination Certificate

active

06240620

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to making of bismuth 2212 superconducting wire or tape. More particularly, the present invention relates to a method of making a bismuth 2212 superconducting wire or tape, which is capable both of improving a critical current property of the bismuth 2212 superconducting wire or tape and of realizing high critical current density.
DESCRIPTION OF THE PRIOR ART
Making into a wire or tape has been studied for practical application of oxide superconductors. Several methods of making a tape have been provided, e.g., a doctor blade method, a dip-coating method, a coating method, and a silver-sheathed method. In every method, a composite wire consisting of an oxide superconductor and a metallic base made of silver is formed.
The making methods above-mentioned have been applied to a wire making process of a Bi
2
Sr
2
CaCu
2
O
x
superconductor (hereinafter, bismuth 2212 ) and realization of high critical current density has been studied. In a making process of the bismuth 2212 superconducting tape to which the doctor blade method, dip-coating method, or coating method is applied, a thick film consisting of an organic solvent(s) and the bismuth 2212 superconductor is formed on a metallic base made of silver or a silver base alloy and an oriented structure is formed from a partial molten state after eliminating the organic substance(s) by heating the thick film.
Critical current density realized by any of the methods up to now is, however, no more than 10
5
A/cm
2
by average current density in a magnetic field of 4.2 K and 10 T. Improvement of critical current density is inevitably demanded and hoped in order to widen practical application range of the bismuth 2212 superconducting wire or tape. The improvement will enable a system consisting of a magnet and a refrigerator to be used at higher temperature and also promote improvement of security and design variation as well as miniaturization of the system.
The present invention has an object to provide a new method of making a bismuth 2212 superconducting wire or tape, which aims to realize high current density for practical application of the bismuth 2212 superconducting wire or tape.
This and other objects, features and advantages of the invention will become more apparent upon a reading of the following detailed description and drawings.


REFERENCES:
patent: 5811376 (1998-09-01), Huang
patent: 5874384 (1999-02-01), Balachandran
patent: 6028036 (2000-02-01), Tenbrink

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