Process for producing molded bodies from precursors of high-temperature superconductors

US5328890A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Eberhard Preisler · Lechenich, DE
• Joachim Bock · Lechenich, DE

Key dates

• Filing date: Dec 18, 1992
• Grant date: Jul 12, 1994
• Expiry date: Dec 18, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S505/739
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

To produce more complex molded bodies from precursors of high-temperature superconductors based on the oxides of bismuth, strontium, calcium and copper, the homogeneous melt of these oxides is cast in molds at temperatures of 870.degree. to 1000.degree. C. In this process, the geometrically appropriately shaped molds are composed of a material having a melting point of at least 1000.degree. C. Finally, the molds containing solidified melt of the oxides of bismuth, strontium, calcium and copper are treated with dilute hydrofluoric acid at temperatures of 20.degree. to 90.degree. C. until the molds are dissolved.