C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
25/139
C04B 35/50 (2006.01) C04B 35/00 (2006.01) C04B 35/45 (2006.01) C04B 35/64 (2006.01) C04B 35/653 (2006.01) H01B 12/00 (2006.01) H01L 39/24 (2006.01)
Patent
CA 1321870
HOE 88/H 026 Process for producing a high-temperature superconductor and also shaped bodies composed thereof Abstract of the disclosure: To produce a high-temperature superconductor of the composition Bi2(Sr,Ca)3Cu2O/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 stoichio- metric ratio. The mixture is heated at temperatures of 870 to 1100°C until a homogeneous melt is obtained. The melt is poured into molds and allowed to solidify in them. The cast bodies removed from the molds are annealed for 6 to 30 hours at 780 to 850°C. Finally, the annealed cast bodies are treated for at least 6 hours at tempera- tures of 600 to 820°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 molds u d in producing the cast bodies.
606320
Bock Joachim
Preisler Eberhard
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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