Patent ID: 8097137
Filing Date: 2012-01-17
Classification: G01N

Abstract:
1. A gas sensor element, comprising: A closed-bottomed cylindrical base body made of solid electrolyte which contains zirconia as a principle component; An outer electrode formed on an outer surface of the base body; An inner electrode formed on an inner surface of the base body; and An adhesive layer formed between the base body and the outer electrode and containing zirconia as a principle component, Wherein the base body and the adhesive layer comprise tetragonal phase zirconia particles as well as other zirconia particles, Wherein a proportion of tetragonal in zirconia particles of the base body falls within a range from 45% or more to 60% or less, and Wherein a proportion of tetragonal in zirconia particles of the adhesive layer is greater than that of tetragonal in zirconia particles of the base body.