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US 12,656,299 B2Granted
Gas sensor element and gas sensor
AssigneeNGK Insulators, Ltd.
InventorsRyo Onishi, Kaoru Shibutani
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Abstract
A sensor element includes: an element body including an oxygen-ion-conductive solid electrolyte layer; and a protective layer that covers at least part of the element body and is a porous body having a plurality of pores thereinside. The standard deviation of the porosity of the protective layer is 2.3% or less.
Claims12
A gas sensor element comprising:
- an element body including an oxygen-ion-conductive solid electrolyte layer;
- and
- a protective layer that covers at least part of the element body and is a porous body having a plurality of pores therein, wherein the standard deviation of the porosity of the protective layer is 2.3% or less,
- wherein the protective layer includes a porous inner protective layer and a porous outer protective layer that is located outward of the inner protective layer and has a smaller porosity than the inner protective layer,
- wherein the element body has an elongate rectangular parallelepiped shape and includes a measurement-object gas flow portion that is formed inside the element body and through which a measurement-object gas introduced thereinto flows,
- wherein the inner protective layer covers a closest surface of the element body that is one of four surfaces thereof extending in a longitudinal direction of the element body and that is closest to the measurement-object gas flow portion, and
- wherein, in the inner protective layer, the standard deviation of the porosity in a portion that covers a region of the closest surface onto which the measurement-object gas flow portion is projected is 2.3% or less.
4 more elements
A gas sensor element comprising:
- an element body including an oxygen-ion-conductive solid electrolyte layer;
- and
- a protective layer that covers at least part of the element body and is a porous body having a plurality of pores therein, wherein the standard deviation of the porosity of the protective layer is 2.3% or less,
- wherein the protective layer includes a porous inner protective layer and a porous outer protective layer that is located outward of the inner protective layer and has a smaller porosity than the inner protective layer,
- wherein the element body has an elongate rectangular parallelepiped shape and includes a measurement-object gas flow portion that is formed inside the element body and through which a measurement-object gas introduced thereinto flows,
- wherein a gas inlet that is an inlet of the measurement-object gas flow portion has an opening on a longitudinal end surface of the element body,
- wherein the inner protective layer covers the end surface of the element body, and
- wherein, in the inner protective layer, the standard deviation of the porosity in a portion that covers the end surface is 2.3% or less.
5 more elements
A gas sensor element comprising:
- an element body including an oxygen-ion-conductive solid electrolyte layer;
- and
- a protective layer that covers at least part of the element body and is a porous body having a plurality of pores therein, wherein the standard deviation of the porosity of the protective layer is 2.3% or less,
- wherein the protective layer includes a porous inner protective layer and a porous outer protective layer that is located outward of the inner protective layer and has a smaller porosity than the inner protective layer,
- wherein the standard deviation of the porosity in the inner protective layer is 2.3% or less,
- wherein the element body has an elongate rectangular parallelepiped shape and includes a measurement-object gas flow portion that is formed inside the element body and through which a measurement-object gas introduced thereinto flows,
- wherein the inner protective layer covers a closest surface of the element body that is one of four surfaces thereof extending in a longitudinal direction of the element body and that is closest to the measurement-object gas flow portion, and
- wherein, in the inner protective layer, the standard deviation of the porosity in a portion that covers a region of the closest surface onto which the measurement object gas flow portion is projected is 2.3% or less.
5 more elements
A gas sensor element comprising:
- an element body including an oxygen-ion-conductive solid electrolyte layer;
- and
- a protective layer that covers at least part of the element body and is a porous body having a plurality of pores therein, wherein the standard deviation of the porosity of the protective layer is 2.3% or less,
- wherein the protective layer includes a porous inner protective layer and a porous outer protective layer that is located outward of the inner protective layer and has a smaller porosity than the inner protective layer,
- wherein the standard deviation of the porosity in the inner protective layer is 2.3% or less,
- wherein the element body has an elongate rectangular parallelepiped shape and includes a measurement-object gas flow portion that is formed inside the element body and through which a measurement-object gas introduced thereinto flows,
- wherein a gas inlet that is an inlet of the measurement-object gas flow portion has an opening on a longitudinal end surface of the element body,
- wherein the inner protective layer covers the end surface of the element body, and
- wherein, in the inner protective layer, the standard deviation of the porosity in a portion that covers the end surface is 2.3% or less.
6 more elements
Dependencies are inferred from the claim text.