Solid electrolyte oxygen sensors

US4221650A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Karl-Hermann Friese · Leonberg, DE
• Friedrich Esper
• Heinz Geier · Leonberg, DE

Key dates

• Filing date: May 30, 1978
• Grant date: Sep 9, 1980
• Expiry date: May 30, 1998

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P70/50
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Oxygen sensors having a fine-grained stabilized cubic zirconium dioxide electrolyte contact respective electrodes. The zirconium dioxide contains between 15% and 50% by volume of Al.sub.2 O.sub.3 in a crystalline state and has good mechanical and thermal properties. The oxygen sensor may have a composite zirconium dioxide solid electrolyte element. The invention also includes a wider range of related Al.sub.2 O.sub.3 - containing stabilized cubic zirconium dioxides containing between about 8% and 85% by volume Al.sub.2 O.sub.3. The invention further provides methods of manufacturing such Al.sub.2 O.sub.3 - containing zirconium dioxide and for manufacturing oxygen sensors.