Ceramic layer systems, particularly for gas sensors

US5998012A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Karl-Hermann Friese · Leonberg, DE
• Lothar Weber · Stuttgart, DE
• Werner Gruenwald · Gerlingen, DE
• Gert Lindemann · Lichtenstein, DE
• Harald Neumann · Lambach, DE
• Ulrich Eisele · Stuttgart, DE

Key dates

• Filing date: Sep 19, 1996
• Grant date: Dec 7, 1999
• Expiry date: Sep 19, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/257
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A ceramic layer system including at least two layers having respective ion conductivities which are substantially different includes a substrate layer composed of a ceramic material and having substantially no ion conductivity; and at least one conducting layer positioned adjacent to the substrate layer, containing coated ceramic particles composed of ceramic particles composed of a ceramic material having no substantial ion conductivity which are coated with a material having a substantial ion conductivity so that each conducting layer of the at least one conducting layer has a continuous phase after sintering composed of the material which has a substantial ion conductivity and so that the at least one conducting layer has an ion conductivity effective to conduct ions. A method of producing a gas sensor for detecting small quantities of at least one gas in gas mixtures includes providing a substrate layer composed of ceramic particles composed of a material having substantially no ion conductivity; applying a layer composed of coated ceramic particles onto the substrate layer, the coated ceramic particles being composed of ceramic particles composed of a material that has no subs…