High-temperature superconducting solid bodies and process for producing them

US5830829A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Markus BRAND · Eppstein, DE
• Gunter Brommer · Wiesbaden, DE
• Steffen Elschner · Heidelberg, DE
• Stephan Gauss · Pocking, DE
• Wolf Assmus · Hanau, DE

Key dates

• Filing date: Nov 27, 1995
• Grant date: Nov 3, 1998
• Expiry date: Nov 27, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S505/729
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to a process for producing textured high-temperature superconducting solid shaped parts, which comprises solid shaped parts made of oxide-ceramic superconducting material of a phase mixture of the substance class YBCO first being molded, pressed and sintered, a zonewise thermal treatment then being carried out along their longitudinal axis. Heating is first carried out, in a first zone, to a temperature in the range of from 50 to 200 K below the peritectic melting temperature of the phase mixture initially present in the shaped part, the temperature then is raised, in a second zone having a temperature gradient in the range of from 10 to 250 K/cm, then, in a third zone, a temperature of up to 50 K above the peritectic melting temperature of the phase mixture initially present in the shaped part is maintained, cooling then being carried out, in a fourth zone having a temperature gradient in the range of from 10 to 250 K/cm. Finally, in yet a fifth zone, a temperature in the range of from 50 to 200 K below the peritectic melting temperature of the phase mixture initially present in the shaped part is maintained. According to the invention, the zones are moved al…