Gas sensor and method for manufacturing the same

A gas sensor, reference gas technology, applied in instruments, scientific instruments, measuring devices, etc., can solve problems such as difficulty in precise combustion control

Active Publication Date: 2006-01-25
NGK SPARK PLUG CO LTD
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

As a result, the presence of hydrogen introduces a deviation from the theoretical value of the lambda point detected by the detection electrode, thus making precise combustion control difficult

Method used

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  • Gas sensor and method for manufacturing the same
  • Gas sensor and method for manufacturing the same
  • Gas sensor and method for manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

example

[0077] The following various experiments were carried out to verify the effects of the invention.

[0078] Prepare in the following manner with figure 2 Various test pieces of the sensor element 2 of the shape shown in . First, zirconia having 5 mol % of yttrium oxide added thereto was pelletized and formed into a bottomed cylindrical shape. This bottomed cylinder was fired at 1,300° C. for 2 hours to prepare solid electrolyte layer 28 . Next, solid electrolyte layer 28 is plated with platinum on its outer circumference and its inner circumference to form outer electrode layer 26 and inner electrode layer 27 . Then, the surface of the external electrode layer 26 was plasma sprayed with Al-Mg spinel to form a porous body having a thickness of 200 μm of the electrode protection layer 100 .

[0079] In Example 1, the porous body of the electrode protective layer 100 was then immersed in H in vacuum. 2 PtCl 6 aqueous solution for 10 minutes. The H 2 PtCl 6 The aqueous sol...

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Abstract

The present invention provides a gas sensor having a gas sensor element which includes: a reference electrode; a solid electrolyte layer having oxygen ion conductivity; a detection electrode; and an electrode-protecting layer covering the detection electrode. The electrode-protecting layer is a porous body carrying catalytic metal, and includes: a detection electrode side portion having a catalytic metal loading ratio of more than 0% by weight and not more than 0.005% by weight; and a surface side portion provided closer to the outer surface of the electode-protecting layer than the detection electrode side portion, the surface side portion having a catalytic metal loading ratio of 0.01% by weight or more.

Description

technical field [0001] The present invention relates to a gas sensor suitable for combustion control of an internal combustion engine, etc., and a method for manufacturing the gas sensor. Background technique [0002] A gas sensor installed in an exhaust system of an internal combustion engine for detecting the oxygen concentration in exhaust gas is used for combustion control of the internal combustion engine. In particular, known gas sensor elements included in gas sensors are equipped with: a solid electrolyte layer made of ceramics such as zirconia having oxygen ion conductivity; A detection electrode on one surface and made of platinum or the like for contacting the gas to be measured; and a reference electrode placed on the other surface of the solid electrolyte layer and made of platinum or the like for contacting the reference gas . Also, on the surface of the detection electrode, a porous electrode protection layer made of aluminum magnesium spinel or the like is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/409G01N27/30
Inventor 渥美尚胜矶村浩中河圭太古市徹小岛孝夫
Owner NGK SPARK PLUG CO LTD
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