Process for producing a high-temperature superconductor and also

Details Process for producing a high-temperature superconductor and also Process for producing a high-temperature superconductor and also

1994-01-11

1995-04-25

Bell, Mark L.

Superconductor technology: apparatus, material, process

High temperature devices, systems, apparatus, com- ponents,...

501123, 501126, 252518, 252521, 505121, 505420, 505450, 505492, 505501, 505782, 505739, C01G 2900

Patent

active

054098882

ABSTRACT:
To produce a high-temperature superconductor of the composition Bi.sub.2 (Sr,Ca).sub.3 Cu.sub.2 O.sub.8+x having a strontium to calcium ratio of 5:1 to 2:1 and a value of x between 0 and 2, the oxides and/or carbonates of bismuth, strontium, calcium and copper are vigorously mixed in a stoichiometric ratio. The mixture is heated at a temperature of 870.degree. to 1100.degree. C. until a homogeneous melt is obtained. The melt is poured into mold and allowed to solidify in them. The cast bodies removed from the molds are annealed for 6 to 30 hours at 780.degree. to 850.degree. C. Finally, the annealed cast bodies are treated for at least 6 hours at temperatures of 600.degree. to 820.degree. C. in an oxygen atmosphere. The cast bodies can be converted into shaped bodies of the desired sizes by mechanical processes before they are annealed. The shape and size of the shaped bodies may also be determined by the shape and dimensioning of the mold used in producing the cast bodies.

REFERENCES:
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