Oxygen sensing element having barrier layer between ceramic substrate and solid electrolyte layer
US4462890A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 1982 |
| Grant date | Jul 31, 1984 |
| Priority date | — |
| Expiry date | Feb 16, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4071
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.