Oxygen sensing element having barrier layer between ceramic subs

Details Oxygen sensing element having barrier layer between ceramic subs Oxygen sensing element having barrier layer between ceramic subs

1982-02-16

1984-07-31

Kaplan, G. L.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204426, G01N 2758

Patent

active

044628900

ABSTRACT:
An oxygen sensing element having a ceramic substrate, a layer of an oxygen ion conductive solid electrolyte such as zirconia containing a stabilizing oxide such as yttria, and a pair of electrode layers formed on one side of the solid electrolyte layer so as to be spaced from each other. To prevent a significant change in the output characteristic of the element caused by diffusion of the stabilizing oxide from the solid electrolyte layer into the ceramic substrate, there is a barrier layer which intervenes between the substrate and the solid electrolyte layer at least in a region between the two electrode layers. The barrier layer is formed of a ceramic material such as the above mentioned solid electrolyte or a metal such as platinum, or has a double-layer structure consisting of a metal layer in direct contact with the substrate and an outer layer formed of a ceramic material.

REFERENCES:
patent: 4040929 (1977-08-01), Bauer et al.
patent: 4298573 (1981-11-01), Fujishiro
patent: 4300991 (1981-11-01), Chiba et al.
patent: 4306957 (1981-12-01), Ishitani et al.

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