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31. 发明公开

EP1671114A1 SENSORELEMENT ZUR BESTIMMUNG DER SAUERSTROFFKONZENTRATION EINES ABGASES EINER BRENNKRAFTMASCHINE UND VERFAHREN ZU DESSEN HERSTELLUNG 有权
标题翻译：传感器元件，用于确定废气甲SAUERSTROFFKONZENTRATION OF MAKING的内燃发动机和方法
公开(公告)号：EP1671114A1
公开(公告)日：2006-06-21
申请号：EP04766471.9
申请日：2004-08-11
申请人： ROBERT BOSCH GMBH
发明人： WAHL, Bjoern , GUENSCHEL, Harald , FICKER, Berthold
IPC分类号： G01N27/407 , G01N27/417
CPC分类号： G01N27/4072 , G01N27/4071 , G01N27/419
摘要： The invention relates to a sensor element (10) serving to detect a physical property of a gas to be measured, preferably to determine the concentration of oxygen or the temperature of an exhaust gas of a combustion engine. The sensor element (10) comprises a first solid-electrolyte film (21), a second solid-electrolyte film (22), and a diffusion barrier (41) that is placed in a layer plane between the first and second solid-electrolyte films (21, 22). A gas-impermeable or at least largely gas-impermeable covering layer (44) is provided on the diffusion barrier (41) in areas so that, in the areas in which the covering layer (44) is situated on the diffusion barrier (41), the diffusion of the gas to be measured into or out of the diffusion barrier (41) is at least largely prevented. The invention also relates to a method for producing a sensor element (10), whereby the sensor element (10) has a diffusion barrier (41) that is removed by a laser (81) in order to set the diffusion resistance of the diffusion barrier (41). The diffusion barrier (41) is placed between a first and a second solid-electrolyte film (21, 22). The invention also relates to another method with which a diffusion barrier (41) is placed between a first and a second solid-electrolyte film (21, 22). A covering layer (44) is placed on a side of the diffusion barrier (41) facing a gas to be measured located outside of the sensor element (10). This covering layer is gas-impermeable or at least largely gas-impermeable after a sintering process. The covering layer (44) is removed in order to set the diffusion resistance of the diffusion barrier (41).

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