Method of producing superconducting tapes with a high current density
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United States of America Patent
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Feb 6, 2001
Grant Date -
N/A
app pub date -
May 2, 1996
filing date -
Nov 12, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The inventive method for producing a superconductor is accomplished by longitudinally pulling a metal pipe having a cavity filled with a metal oxide mixture in polycrystalline powder to reduce the outer diameter of the pipe, sintering the metal oxide mixture to form a workpiece, and progressively flattening the workpiece in a succession of pressings. The flattening step is conducted with a pair of coordinately operated clamping jaws, each of which having a work surface which is curvilinear with distinct opposite ends. The clamping jaws are mounted to hinged brackets connected by eccentric arms to rotatable shafts arranged for providing power transmission to the clamping jaws such that, during each of the pressings, each eccentric arm extends at an angle to a respective hinged bracket which is approximately 0.degree. or approximately 180.degree. when power transmission to the workpiece is maximal. The clamping jaws are moved along paths to cause flattening to occur substantially entirely by widening the workpiece without substantially lengthening the workpiece. The work piece is then advanced about 4 mm between pressings as the clamping jaws are returned to their clamping positions, and the pressing is repeated.
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