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Oxygen sensor element

An oxygen sensor and component technology, which is applied in the field of material composition of gas sensor components, can solve problems such as insufficient durability, sensor component degradation, carbonation, etc., and achieve good sensor characteristics and high humidity resistance.

Pending Publication Date: 2020-09-15
KAO CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In addition, the material constituting the conventional oxygen sensor element has the characteristics of easy hydrogen oxidation and carbonation. Therefore, when detecting the oxygen concentration in the gas, the surrounding gas components such as water vapor and carbon dioxide gas will cause the sensor element to deteriorate, and there is a problem of durability. sexual inadequacy

Method used

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Embodiment Construction

[0029] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings and the like. The oxygen sensor element of the present embodiment is formed of a ceramic sintered body, and the central part of the sintered body is heated at a high temperature by connecting it to a power source and passing a current, and this heat-generating part (called a hot spot) is used as an oxygen concentration detection part. . In addition, the oxygen sensor using the oxygen sensor element of this embodiment as a sensor element detects the oxygen concentration based on the value of the current flowing through the sintered body as the sensor element.

[0030] The oxygen sensor element as the detector of the oxygen concentration in this embodiment has the following composition: 2 Cu 3 o 7－δ The composition (hereinafter referred to as the existing composition) forms part of the material, which is selected from the elements of group 2 of the periodic tabl...

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Abstract

This oxygen sensor element is formed of a ceramic sintered body, and detects oxygen concentration on the basis of a current value when a voltage is applied. The ceramic sintered body has a compositionLnBa<2>-xSrxCu<3>O<7-delta>, which results from substituting a portion of a composition formula LnBa<2>Cu<3>O<7-delta> (wherein Ln is a rare-earth element and delta is 0 to 1) with any of the elements selected from group 2 elements of the periodic table, e.g. strontium (Sr). Here, the substitution amount x of Sr satisfies 0<x<=1.5. Due to this configuration, an oxygen sensor element having improved durability, etc. can be provided, without compromising sensor characteristics.

Description

technical field [0001] The present invention relates to a material composition of a gas (oxygen) sensor element using a ceramic sintered body. Background technique [0002] At present, there is a need to detect the oxygen concentration in the exhaust gas of an internal combustion engine, etc., to detect the oxygen concentration used in the combustion management of the boiler, and to detect the oxygen concentration in various gases. As the detection element of the oxygen concentration, various types of Oxygen sensors formed of various materials. For example, as a material composition of an oxygen sensor using a ceramic sintered body, it is known to use LnBa 2 Cu 3 o 7－δ with Ln 2 BaCuO 5 (Ln is a rare earth element) and an oxygen sensor of a composite ceramic body obtained by mixing (Patent Document 1). [0003] The aforementioned oxygen sensor using a ceramic sintered body wire is a hot spot type oxygen sensor utilizing a hot spot phenomenon in which a part of the wire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12C04B35/45
CPCC04B35/4508C04B2235/3213C04B2235/3215C04B2235/3224C04B2235/3227C04B2235/3208C04B2235/3205G01N27/125G01N27/12G01N27/416C04B35/45C04B35/4504G01N27/4073G01N27/409G01N33/0036
Inventor 冈元智一郎井口宪一高桥健田中哲郎伊藤千佳
Owner KAO CORP
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