Sensor element for detecting at least one property of a measuring gas in a measuring gas space, containing a ground, impregnated slip layer

Inactive Publication Date: 2015-11-26
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for manufacturing a sensor element that can detect properties of a measuring gas in a measuring gas space. The method improves the robustness of the sensor element against thermal shock and is cost-effective. The method involves grinding the sensor element using a corundum grinding belt or a grinding disk, which can provide multiple grinding times. A diffusion barrier is used to prevent gas from flowing directly out of the gas entry hole and contamination or irregularities during operation can be avoided. An impregnating fluid or solution is used to adjust the normal position and protect the sensor element from harmful substances in the exhaust gas. The method can be adapted to various functional element lengths and offers all-round protection to the sensor element. The method is cost-effective and can provide a single or repeated coating.

Problems solved by technology

Such sensors are subject to increasing functional demands.
This leads to the formation of water droplets in the exhaust pipe.
Due to the impact of water droplets, the heated ceramic of the lambda sensor may be damaged or even destroyed as a result of thermal stresses or fractures in the sensor ceramic.

Method used

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  • Sensor element for detecting at least one property of a measuring gas in a measuring gas space, containing a ground, impregnated slip layer
  • Sensor element for detecting at least one property of a measuring gas in a measuring gas space, containing a ground, impregnated slip layer

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Embodiment Construction

[0042]FIG. 1 shows a view of a cross section perpendicular to a direction of a layer structure of a sensor element 10 according to the present invention. Sensor element 10 depicted in FIG. 1 may be used to verify physical and / or chemical properties of a measuring gas, whereby one or multiple properties may be detected. The present invention is described below, in particular, with reference to a qualitative and / or quantitative detection of a gas component of the measuring gas, in particular with reference to a detection of an oxygen content in the measuring gas. The oxygen content may be detected, for example, in the form of a partial pressure and / or in the form of a percentage. However, other types of gas components are, in principle, also detectable, for example, nitrogen oxides, hydrocarbons and / or hydrogen. Alternatively or in addition, other properties of the measuring gas are also detectable, however. The present invention may be used, in particular, in the field of automotive ...

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Abstract

A method for manufacturing a sensor element for detecting (i) a gas component in a measuring gas or (ii) a temperature of the measuring gas includes: introducing at least one functional element into at least one slip at least once in such a way that a slip layer is applied to the functional element, the functional element including at least one solid electrolyte and at least one functional layer; sintering the slip layer on the functional element; grinding the slip layer at least in the area of the at least one functional layer; impregnating the slip layer; and thermally treating the impregnated slip layer.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a sensor element and a method for detecting a measuring gas.[0003]2. Description of the Related Art[0004]A large number of sensor elements and methods for detecting at least one property of a measuring gas in a measuring gas space are known from the related art. In principle, this may involve arbitrary physical and / or chemical properties of the measuring gas, whereby one or multiple properties may be detected. The present invention is described below, in particular, with reference to a qualitative and / or quantitative detection of a gas component of the measuring gas, in particular, with reference to a detection of an oxygen content in the measuring gas. The oxygen content may, for example, be detected in the form of a partial pressure and / or in the form of a percentage. Alternatively or in addition, other properties of the measuring gas are also detectable, however.[0005]For example, suc...

Claims

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Application Information

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IPC IPC(8): G01N27/407
CPCG01N27/4075G01N27/4071G01N27/4072G01N27/4077Y02E60/50G01N27/409H01M4/8885H01M4/8889H01M4/8892
InventorSCHNEIDER, JENSBRAUN, HARRYKUSCHEL, PETRANEES, SIEGFRIED
OwnerROBERT BOSCH GMBH