Laminated system for gas sensors and process for producing it

摘要

PCT No. PCT/DE91/00749 Sec. 371 Date Apr. 5, 1993 Sec. 102(e) Date Apr. 5, 1993 PCT Filed Sep. 21, 1991 PCT Pub. No. WO92/07253 PCT Pub. Date Apr. 30, 1992.A layer system (11, 12) and a process for producing such a layer system is proposed which serves, in particular, to produce exhaust gas sensors. The modified layer system according to the invention advantageously contains very finely dispersed and highly reactive mixed oxides of alkali metals and at least trivalent elements on or in the porous covering layer (12), which mixed oxides exhibit an improved gettering action with respect to all the contaminants from the exhaust gas. Exhaust gas sensors having a layer system according to the invention are largely insensitive to contaminants from the exhaust gas.