Method for fabricating high-activity electrodes for exhaust gas sensors

US5698267A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Karl-Hermann Friese · Leonberg, DE
• Hans-Martin Wiedenmann · Stuttgart, DE
• Frank Stanglmeier · Heubach, DE

Key dates

• Filing date: Oct 10, 1996
• Grant date: Dec 16, 1997
• Expiry date: Oct 10, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S264/36
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for fabricating a high-activity cermet electrode which is applied on an exhaust gas sensor including an oxygen ion conducting solid electrolyte, which is composed of a cermet material composed of at least one catalytically active material and at least one oxygen ion conducting ceramic material, which is bonded to the solid electrolyte of the exhaust sensor by co-sintering the cermet electrode and the solid electrolyte at a temperature ranging from 1300.degree. to 1600.degree. C. to provide a porous cermet electrode, and which contains at least one further catalytically active material which is embedded in the pores of the porous cermet electrode after co-sintering, the method including bonding together an unsintered solid electrolyte which conducts oxygen ions and a cermet electrode by co-sintering at from 1300.degree. to 1600.degree. C. to provide a porous cermet electrode; and subsequently introducing at least one further catalytically active material into pores of the porous cermet electrode.