Gas sensor element
US-2016018357-A1 · Jan 21, 2016 · US
Gas sensor element
US10837939B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10837939-B2 |
| Application number | US-201916256680-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 24, 2019 |
| Priority date | Feb 6, 2018 |
| Publication date | Nov 17, 2020 |
| Grant date | Nov 17, 2020 |
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- Title
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- Abstract
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Abstract
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The present disclosure provides a gas sensor element comprising a porous protective layer with improved water repellency upon continuously water pouring, which is a gas sensor element comprising: a detection portion; and a porous protective layer formed around the detection portion, wherein the porous protective layer is formed from an aggregate containing alumina and a coating material containing silica, and in the porous protective layer, the weight concentration x % by weight of the coating material with respect to the total weight of the aggregate and the coating material, and the porosity y %, satisfy the following formula (1): y ≤0.0058 x 2 −1.2666 x +68 (1), and in the porous protective layer, the pore volume of pores having a pore diameter of 100 nm or less is 0.02 mL/g or less.
First claim
Opening claim text (preview).
What is claimed is: 1. A gas sensor element comprising: a detection portion having a stack of a solid electrolyte body and a heat generating body, the solid electrolyte body having at least a pair of electrodes on opposite sides thereof and the heat generating body including a heat generating source; and a porous protective layer formed around the detection portion, wherein the porous protective layer is formed from an aggregate containing alumina and a coating material containing silica, and in the porous protective layer, the weight concentration x % by weight of the coating material with respect to the total weight of the aggregate and the coating material, and the porosity y %, satisfy the following formula (1): y≤ 0.0058 x 2 −1.2666 x+ 68 (1) and, in the porous protective layer, the pore volume of pores having a pore diameter of 100 nm or less is 0.02 mL/g or less. 2. The gas sensor element according to claim 1 , wherein the weight concentration of the coating material in the porous protective layer is 10% by weight or more. 3. The gas sensor element according to claim 1 , wherein the porosity of the porous protective layer is 25% or more. 4. A method for producing the gas sensor element according to claim 1 , comprising: forming a porous protective layer from an aggregate containing alumina and a coating material containing silica around the detection portion; and baking the formed porous protective layer at 1000° C. or higher.
Assignees
Inventors
Classifications
using sensor elements of laminated structure · CPC title
- G01N27/4075Primary
Composition or fabrication of the electrodes and coatings thereon, e.g. catalysts · CPC title
Means for heating or controlling the temperature of the solid electrolyte · CPC title
Oxygen concentration cells · CPC title
- G01N27/4077Primary
Means for protecting the electrolyte or the electrodes · CPC title
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- What does patent US10837939B2 cover?
- The present disclosure provides a gas sensor element comprising a porous protective layer with improved water repellency upon continuously water pouring, which is a gas sensor element comprising: a detection portion; and a porous protective layer formed around the detection portion, wherein the porous protective layer is formed from an aggregate containing alumina and a coating mat…
- Who is the assignee on this patent?
- Toyota Motor Co Ltd, Denso Corp
- What technology area does this patent fall under?
- Primary CPC classification G01N27/4075. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Nov 17 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).