H - Electricity – 01 – B
Patent
H - Electricity
01
B
H01B 1/08 (2006.01) C04B 35/45 (2006.01) C04B 35/653 (2006.01) H01B 12/00 (2006.01) H01B 13/00 (2006.01) H01L 39/24 (2006.01)
Patent
CA 2131944
Solid parts made of high-temperature superconductor material Abstract Solid parts made of high-temperature superconductor material are composed of the oxides of bismuth, stron- tium, calcium and copper and of the sulfates of strontium and/or barium. These solid parts have an enhanced cur- rent-carrying capacity which is caused by a preferential orientation of the crystallites, the crystallographic c axis being perpendicular to the temperature gradient during their solidification from the melt. In order to produce said solid parts, a homogeneous melt of the oxides of bismuth, strontium, calcium and copper and of the sulfates of strontium and/or barium is cast, at temperatures of from 900 to 1300°C, in permanent mods, the melt is allowed to solidify therein slowly, and the solid parts taken from the permanent molds are then annealed in an oxygen-containing atmosphere at from 700 to 900°C. In the process, the homogeneous melt is cast in permanent molds having at least two parallel walls, as a result of which there is produced in the solid parts, both after their solidification and after they have been annealed, a crystallographic preferential orientation of the crystallites.
Bock Joachim
Elschner Steffen
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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