Process for producing tubular molded parts of high temperature superconductor material

US5371068A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Eberhard Preisler · Lechenich, DE
• Joachim Bock · Lechenich, DE
• Johannes Holzem · Gerstungen, DE
• Friedrich-Wilhelm Dorn · Kornwestheim, DE

Key dates

• Filing date: Apr 14, 1993
• Grant date: Dec 6, 1994
• Expiry date: Apr 14, 2013

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10N60/0268
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

To produce tubular molded parts made of high-temperature superconductor oxide material based on bismuth, calcium, strontium and copper, a homogeneous melt of the oxide with a specified stoichiometry is allowed to run at temperatures of 900.degree. to 1100.degree. C. into a casting zone rotating about its horizontal axis. The solidified molded part is removed from the casting zone and it is annealed for 4 to 150 hours at 700.degree. to 900.degree. C. in an oxygen-containing atmosphere. A plant for producing tubular molded parts includes a rotatably arranged mold (4, 9) which is provided at least at one end face with a front plate 6 which reduces its free cross section, a runner 7 extending into the interior of the mold (4, 9) and a crucible 8 arranged above the runner 7 which is capable of feeding the runner 7 with melt (cf. FIG. 2 A).