Spray-pyrolysis process of preparing superconductor precursors

US5614472A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Rodney Riddle · Holzminden, DE
• Matthias Kuntz · Seeheim-Jugenheim, DE
• Bernd M uller · Bischofswerda, DE
• Dietmar Raulin · Lorsch, DE
• G unther Feldmann-Schlobohm · Dieburg, DE

Key dates

• Filing date: May 12, 1995
• Grant date: Mar 25, 1997
• Expiry date: May 12, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S505/823
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to a spray pyrolyric process for the preparation of multi-element metal oxide powders useful as precursors of high temperature superconductor ceramics. Aerosols of aqueous solutions containing corresponding metal salts admixed in the required stoichiometric proportion are sprayed through an independently operated hydrogen/oxygen flame in such a way that a flame temperature of 800.degree.-1100.degree. C. is maintained to form said powders. Any contact of the aerosols and powders generated during the process with carbon or carbon-containing compounds or materials is strictly avoided.