Methods for producing oxygen-sensing element, particularly for use with internal combustion engine exhaust emission analysis

US3978006A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Bernhard Topp · Gerlingen, DE
• Horst Neidhard
• Rudolf Pollner
• Karl-Hermann Friese · Leonberg, DE

Key dates

• Filing date: Sep 23, 1974
• Grant date: Aug 31, 1976
• Expiry date: Sep 23, 1994

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/4077
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Methods for making an exhaust-gas-sensing element which is an oxygen concentration cell having a solid electrolyte with an electron-conductive surface on the side exposed to the reference air and a catalytic electron-conductive layer containing micro pores which extend through to the solid electrolyte on the other surface which is adapted to be exposed to the exhaust gases. The electron-conductive catalytic layer is covered with a porous protective layer. The method comprising applying the catalytic layer by means of thin layer techniques and then heating to form the micro pores; or by applying a paste comprising ceramic particles, catalytic particles and a thinning oil and sintering.