Process for manufacturing wire or strip from high temperature superconductors and the sheaths used for implementing the process

US5100867A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Karl-Heinz Gunzelmann · Koblenzer Straße, DE
• Reiner Muller · Kleinsendelbach, DE
• Werner Herkert · Erlangen, DE
• Joachim Grosse · Erlangen, DE
• Gunter Tiefel · Fürth, DE

Key dates

• Filing date: Jun 11, 1990
• Grant date: Mar 31, 1992
• Expiry date: Jun 11, 2010

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/12924
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

In a known process, oxide powders derived from the four-component systems yttrium-barium-copper-oxygen or lanthanum-strontium-copper-oxygen are mixed, pressed, sintered, ground and then heat-treated to produce a superconducting material which can be shaped to the desired cross-section. According to the invention, the powder is compacted by isostatic pressing and the blank so obtained is extruded at a temperature.gtoreq.500.degree. C. to form a metallic sheath with a deformation ratio of at least 50%. The extruded blank is then converted to wire or strip. The current-carrying capacity of the high-temperature superconductor is improved by the extrusion and the resulting alignment of the crystallites. The process can be implemented using known high-temperatures superconducting material.