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WO2010057867A2 - Élément de détection comportant un élément support - Google Patents

Élément de détection comportant un élément support Download PDF

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Publication number
WO2010057867A2
WO2010057867A2 PCT/EP2009/065268 EP2009065268W WO2010057867A2 WO 2010057867 A2 WO2010057867 A2 WO 2010057867A2 EP 2009065268 W EP2009065268 W EP 2009065268W WO 2010057867 A2 WO2010057867 A2 WO 2010057867A2
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WIPO (PCT)
Prior art keywords
solid electrolyte
carrier
sensor element
electrode
electrolyte material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2009/065268
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German (de)
English (en)
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WO2010057867A3 (fr
Inventor
Andreas Opp
Hans-Joerg Renz
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Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
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Priority to US13/129,956 priority Critical patent/US20110214989A1/en
Publication of WO2010057867A2 publication Critical patent/WO2010057867A2/fr
Publication of WO2010057867A3 publication Critical patent/WO2010057867A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/403—Cells and electrode assemblies
    • G01N27/406—Cells and probes with solid electrolytes
    • G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
    • G01N27/4073—Composition or fabrication of the solid electrolyte
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/403—Cells and electrode assemblies
    • G01N27/406—Cells and probes with solid electrolytes
    • G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
    • G01N27/4077—Means for protecting the electrolyte or the electrodes

Definitions

  • the invention is based on known ceramic sensor elements, in particular sensor elements, which are based on electrolytic properties of certain solids, ie the ability of these solids to conduct certain ions. Such sensor elements are used in particular in motor vehicles.
  • Ceramic sensor elements in motor vehicles are sensor elements for determining a composition of an air-fuel mixture, which are also referred to as “lambda sensors” and play an important role in the reduction of pollutants in exhaust gases, both in gasoline engines and in diesel technology
  • the invention can also be applied to other types of ceramic sensor elements, for example to particle sensors or similar types of solid electrolyte sensors, in particular in exhaust gas sensors
  • the invention will be explained below using the example of lambda sensors, but in the light In the above statements, other types of sensor elements can also be produced.
  • Oxygen sensors are known in the prior art in numerous different embodiments.
  • a first embodiment represents the so-called "jump probe” whose measuring principle is based on the measurement of an electrochemical potential difference between a reference gas and the gas mixture to be measured
  • zirconia eg yttria-stabilized zirconia, YSZ
  • YSZ yttria-stabilized zirconia
  • pump cells so-called "pump cells” are used, where an electrical “pump voltage” is applied to two electrodes connected via the solid electrolyte is applied, wherein the "pumping current” is measured by the pumping cell.
  • the material selection in particular the material selection of the solid electrolyte
  • the material selection of the solid electrolyte represents a compromise in many cases.
  • high demands are placed on the electrolytic properties of the solid electrolyte material.
  • a high conductivity for example for ions of a gas component to be detected.
  • Such ionic conductivity is usually caused by lattice defects, for example, oxide ion vacancies in a metal oxide lattice. In order to produce these oxide ion vacancies, a doping is usually used.
  • a dopant is added to the metal oxide of a solid electrolyte matrix material, which occupies lattice sites of the metal oxide, but which causes oxygen defects due to a different value of the metal of the metal oxide of the matrix material. These oxygen vacancies can cause, for example, an oxygen ion conductivity.
  • a typical example of such doping is zirconia, which is doped with an oxide of a lower valency metal.
  • yttri umoxid used.
  • yttrium-stabilized zirconia is the solid electrolyte material commonly used in lambda probes.
  • the solid electrolyte also assumes the function of a carrier material in conventional oxygen sensors, in addition to functioning as an electrolyte.
  • this results in high demands in terms of mechanical stability and thermal shock resistance of this material.
  • mechanical strength and load capacity of conventional solid electrolyte materials decreases with increasing doping and thus with increasing ionic conductivity, a conflict of objectives results from these conditions.
  • Another technical challenge associated with the problem described above is the elimination of leakage. Since the doping can not be arbitrarily increased due to the required mechanical stability and yet since a predetermined ion conductivity must be achieved for the operation of the sensor elements, the sensor elements are operated in many cases at elevated temperatures. For this purpose, for example, heating elements are used. However, under certain conditions, in particular at higher temperatures, due to the ionic conductivity, disturbing leakage currents can occur in the sensor element, which form, for example, between the electrodes of the sensor element and the heating element. For this reason, both the heating element and the electrodes are usually laboriously isolated in the areas not required for the operation of the sensor element.
  • a sensor element for determining at least one property of a gas in a measuring gas space, which at least largely avoids the problem described above and at least largely resolves the illustrated conflict of objectives.
  • the sensor element can in particular be designed to detect a gas component in a gas mixture, for example for the detection of Oxygen.
  • the sensor element can be set up to determine an exhaust gas composition in the exhaust gas of an internal combustion engine.
  • reference may be made, for example, to the above-described embodiments known from the prior art, which may be modified according to the invention.
  • other embodiments and / or applications are in principle possible, for example, the detection of other types of gas components and / or use as a particle counter.
  • a basic idea of the present invention is to separate the functionalities of the mechanical stabilization and carrier function and the ionic conductivity, so that they can be optimized separately. As a result of this separation into the functions of mechanical stability and ionic conductivity, optimization of the ionic conductivity desired at certain points and of the ionic conductivity which is undesirable at other sites can be optimized on the one hand and mechanical carrier function on the other hand.
  • the proposed sensor element accordingly comprises at least one cell with at least one first electrode, at least one second electrode and at least one of the first electrode and the second electrode connecting solid electrolytes with a solid electrolyte material.
  • the sensor element can be designed as a single-cell or multi-cell sensor element, wherein again reference may be made to the above description.
  • the sensor element may thus comprise, for example, a simple jump cell or a simple, unicellular broadband sensor configuration or may also be made more complex, for example according to the known wideband sensors described above with an additional reference electrode.
  • one, several or all cells of the sensor element can be designed according to the invention, wherein a cell in this case is to be understood in each case as a combination of at least two of the existing electrodes and at least one solid electrolyte connecting these electrodes.
  • electrodes can also be designed in several parts.
  • the sensor element comprises at least one carrier element with a carrier material.
  • This carrier material has a lower ionic conductivity than the solid electrolyte material.
  • the support material at room temperature and / or at temperatures between room temperature and 300 0 C and / or at
  • the support member is arranged to perform a carrier function, i. to mechanically stabilize the at least one cell.
  • a mechanical stabilization is to be understood as a function in which the cell, in particular the solid electrolyte material of the solid electrolyte of the cell, in the usually occurring during operation of the sensor element mechanical loads, such as bending loads, tensile loads or compressive loads or combinations of the above and / or other types of burdens, is relieved. In particular, this relief can take place in such a way that the cell and the carrier element together form a cantilevered element, which can also be combined with other elements of the sensor element.
  • the mechanical stabilization can be achieved, for example, in that the carrier element completely or partially surrounds the cell, in particular the solid electrolyte or the solid electrolyte material.
  • This can be done, for example, in that the carrier element forms an open or closed frame, in which the cell and / or the solid electrolyte of the cell are incorporated wholly or partly.
  • This frame can comprise a single introduction opening or a plurality of insertion openings into which the cell or the solid electrolyte can be introduced.
  • the solid electrolyte material may be and / or comprise a ceramic solid electrolyte material.
  • the carrier material may also preferably comprise a ceramic material, which offers the particular advantage that a common ceramic production method can be used.
  • the carrier material has, as shown above, a lower ionic conductivity than the solid electrolyte material.
  • the carrier material also has a lower electronic conductivity than the solid electrolyte material.
  • the solid electrolyte material is an electronic insulator.
  • the carrier material is preferably electronically insulating. It is particularly preferred if the carrier material is also ionically insulating.
  • the carrier material may comprise at least one ceramic insulator material, wherein a ceramic insulator material may be understood to mean a material which is stable both with respect to the ionic conductivity as well as with respect to the electronic conductivity insulating acts.
  • the ceramic insulator material may comprise an aluminum oxide, in particular Al 2 O 3 .
  • other types of I-solatormaterialien in particular ceramic insulator materials, can be used.
  • the carrier material can be designed to be insulating with respect to an ionic conductivity, ie, have no ionic conductivity itself.
  • the support material itself can also have ionic conductive properties, which, however, are less pronounced than the ionically conductive properties of the solid electrolyte material.
  • the carrier material may comprise at least one second solid electrolyte material which has a lower ionic conductivity than the solid electrolyte material. This is technically relatively easy to accomplish, for example by using at least partially identical matrix materials, for example metal oxides, for the solid electrolyte material of the solid electrolyte and the second solid electrolyte material of the support material.
  • zirconium dioxide can be used both for the solid electrolyte material and for the second solid electrolyte material. This offers the advantage that the manufacturing process of the sensor element can be made more reliable since the solid electrolyte material and the second solid electrolyte material can have substantially compatibility, for example with regard to the thermal expansion.
  • the solid electrolyte material and the second solid electrolyte material may then differ, for example, in terms of doping, which has a significant influence on the ionic conductivity.
  • the second solid electrolyte material of the carrier material may be provided with a significantly lower doping than the solid electrolyte material of the solid electrolyte.
  • the same doping material combination may be used for the solid electrolyte material and the second solid electrolyte material, or different types of doping materials may be used to generate the different ionic conductivities of the solid electrolyte material and the second solid electrolyte material.
  • yttrium can be used for the doping material for the solid electrolyte material and / or the second solid electrolyte material, for example in the form of yttrium oxide.
  • Y 2 O 3 can be used.
  • the solid electrolyte material and optionally, albeit less preferably, for the second solid electrolyte material, one or more of the following doping materials may be used: scandium, especially Sc 2 O 3 , erbium, ytterbium, yttrium, calcium, lanthanum, gadolinium, europium, dysprosium.
  • the second solid electrolyte material may preferably also be used in completely undoped form.
  • a zirconium oxide for example zirconium dioxide
  • undoped zirconium dioxide can be used as support material and / or zirconium dioxide, which is only doped to a much lesser extent.
  • scandium in particular in the form of Sc 2 O 3 , particularly preferred because scandium-doped matrix materials, in particular scandium-doped zirconia, have a high ionic conductivity, for example, a higher ionic conductivity than yttrium -doped
  • the support element such that it can exert its mechanical stabilizing function with respect to the at least one cell.
  • the support element there is a possibility that
  • Carrier element at least partially as a frame this frame may be completely closed or may be partially open.
  • a frame is understood as meaning, for example, a flat, for example disk-shaped and / or plate-shaped element having basically any external geometry, for example a round, polygonal or rectangular outer geometry into which at least one opening, preferably a continuous opening, is made.
  • this frame encloses the at least one cell, in particular the solid electrolyte of at least one cell, at least partially.
  • the carrier element may also be wholly or partly as
  • Carrier layer be configured, which may be configured, for example, continuous and without openings.
  • the at least one cell can be applied directly or indirectly, ie with the interposition of one or more intermediate layers, on the carrier layer of the carrier element.
  • This application can be done in conventional layer technology. For example, this printing techniques can be used.
  • the application to the carrier layer can be carried out on one side or on both sides. gene, wherein a one-sided application is preferred for ease of manufacture.
  • the carrier layer can be designed as a self-supporting layer, which gives the sensor element, in particular the cell, a self-supporting mechanical stability.
  • the carrier layer may also have at least one opening, preferably a plurality of openings. These openings can be designed completely or partially continuously, ie completely or partially penetrate the carrier layer.
  • This can be done for example in the form of a grid, wherein the carrier element has a plurality of openings, which together form a perforated grid or opening grid.
  • the openings may be arranged regularly or irregularly.
  • the solid electrolyte material can then be introduced into these openings, so that the
  • these "islands” can each be equipped with their own electrodes, or it can be provided one or more common electrodes that contact these islands.
  • Various other embodiments are conceivable.
  • the sensor element may preferably be produced in a layered construction and may have a layer structure with at least two layer planes.
  • Layer planes are to be understood as planes in which different materials are introduced.
  • at least one electrical through-connection can be provided, wherein the electrical through-connection preferably penetrates the carrier element.
  • the at least one through-hole does not penetrate the solid electrolyte of the cell, but rather the carrier material. Since this carrier material has lower ionic conductivity and preferably also lower electronic conductivity than the solid electrolyte material of the at least one cell, the expense for insulating the plated-through holes in this embodiment can be considerably reduced.
  • a material in one or more of the embodiments described above has significant advantages over conventional sensor elements.
  • a material in the region of the actual cell, a material can be introduced as a solid electrolyte material which has a higher ionic conductivity than the surrounding carrier material, in particular a supporting ceramic.
  • Another advantage is that even a temperature required for the operation of the sensor element can be lowered. This is due in particular to the fact that the ionic conductivity of the at least one cell required for the operation of a measurement can be improved by material optimization of the solid electrolyte material and can already be achieved at considerably lower temperatures. The ion-conductive solid electrolyte material can already be at these lower
  • Temperatures have sufficient functionality. On a heating element, which may be optionally provided, can therefore be completely dispensed with accordingly accordingly. This is of particular interest for low-cost sensor element applications, for example in the area of sensor elements for two-wheeled vehicles, in which preferably only the temperature provided by the exhaust gas is used to heat the sensor element and is sufficient for providing the functionality of the sensor element.
  • the target conflict described above which consists in a pure higher doping of the solid electrolyte material and the associated decrease in stability of the solid electrolyte material, can be eliminated.
  • the carrier element can provide the required properties.
  • thermal shocks also occur to a reduced extent, since, for example, the sensor element can be operated in a temperature range in which an impinging water drop can not lead to any critical temperature drop and thus to no critical temperature shock , For example, the sensor element can be operated in a temperature range below 400 ° C.
  • the carrier element can comprise, for example, an insulating ceramic, for example aluminum oxide. Due to the insulating effect of the substrate ceramic of the carrier element, for example, the insulations of the heating element, the electrodes and the plated through-holes, which are usually introduced by screen printing, can be reduced or greatly reduced in terms of effort. This can lead to significant cost savings through a significant reduction in printing steps and an increase in quality.
  • a sensor element such as an unheated motorcycle sensor
  • this may mean that a sensor element based on an insulating ceramic, for example alumina with simultaneously improved solid electrolyte material, for example as an inlay and sufficient stability would be ready even at lower temperatures.
  • an insulating ceramic for example alumina with simultaneously improved solid electrolyte material, for example as an inlay and sufficient stability would be ready even at lower temperatures.
  • solid electrolyte material for example as an inlay and sufficient stability
  • Y 2 O 3 for example exclusively on zirconium oxide doped with Y 2 O 3
  • considerable simplifications in the construction of the sensor element can be achieved on the other hand and savings and / or simplifications can be made possible during operation.
  • a heating element can be completely dispensed with and / or simpler heating elements operated at lower temperatures can be used.
  • the structure of the sensor element may, for example, essentially correspond to a known structure of sensor elements, with the exception of the modifications described above.
  • the sensor elements may have an outer electrode which is exposed directly or via a protective layer to the gas or gas mixture.
  • an inner electrode can then be provided, wherein the outer electrode and the inner electrode are connected via the at least one solid electrolyte.
  • at least one reference electrode may be provided, as is the case, for example, with multicell broadband sensors, for example according to the prior art described above.
  • an insert of ionically conductive solid electrolyte material can be introduced into the region of a cell formed by the reference electrode and the outer electrode.
  • This use of the solid electrolyte material can be placed in and / or on an ionically and preferably also electronically non-conductive ceramic substrate.
  • the support element has, for example, an opening, for example in the form of a recess and / or punched-out.
  • the solid electrolyte material can be introduced, for example in the form of a continuous layer, for example as a continuous piece of film.
  • the further construction of the sensor element can then take place in a customary manner, for example with an internal reference electrode and an externally applied external electrode.
  • the carrier element may also be designed wholly or partially as a carrier layer.
  • a piece of a film of a solid electrolyte material can then be applied to this carrier layer, for example by lamination.
  • an improved mechanical anchoring and a higher stability of the sensor element can be achieved by the lattice structure described above, which can also be referred to as a network.
  • the solid electrolyte material which may have ionically highly conductive properties, can be introduced into a network of openings, which thus represent themselves as filled bores. The filled area can then ensure a sufficiently large ionic conductivity.
  • a construction with at least one inner and at least one outer electrode can take place.
  • At least one reference air channel can be configured as a printed reference air channel, wherein a reference electrode is connected to a reference air channel containing a porous material.
  • Open reference air channels are also conceivable.
  • an insulating carrier material for example an insulating ceramic
  • one, several or all commonly used insulating layers can be dispensed with. It should be ensured that the conductivity of the
  • Support material in particular the substrate ceramic, is so low that all réellei- conditions regarding the leakage currents are met. For example, when using an aluminum oxide film with appropriate purity as a carrier material, this can be guaranteed.
  • the carrier material in particular a substrate
  • the aluminum oxide is mixed with zirconium oxide.
  • Al 2 O 3 can be mixed with ZrO 2 until just below the percolation limit. In this way, even better mechanical characteristics of the sensor element can be achieved.
  • doped zirconia may be used for the solid electrolyte material.
  • doped zirconia particularly preferred is the use of scandium or an oxide of scandium as the doping material.
  • other types of doping materials may also be used.
  • high oxygen ion conductive materials can be used as solid electrolyte materials, which are compatible with the carrier material. Since the carrier material now usually only has to fulfill mechanical functions, a low-doped, partially stabilized zirconium oxide can be used for this carrier material, for example, which has significantly better mechanical characteristics than the substrate material used hitherto. Overall, it is possible in this way to produce sensor elements which differ significantly in terms of their electrical properties and thus their functionality as a sensor element as well as with regard to their mechanical and / or thermomechanical properties and load capacities compared with known sensor elements.
  • Figure 1A is a schematic representation of a first embodiment of a sensor element according to the invention in a sectional view;
  • Figure 1 B is a perspective view of the sensor element according to Figure 1 A;
  • FIG. 2 shows an illustration analogous to FIG. 1A of a second exemplary embodiment of a sensor element according to the invention
  • FIG. 3A shows a representation analogous to FIG. 1A of a third exemplary embodiment of a sensor element according to the invention.
  • FIG. 3B is a perspective view of the sensor element according to FIG. 3A.
  • sensor elements 110 are set up to determine at least one property of a gas in a measurement gas space 112, for example a physical and / or chemical property.
  • the invention will be described below with reference to lambda probes, which are set up to determine an exhaust gas composition in an exhaust tract of an internal combustion engine, ie in particular an oxygen content in the exhaust gas in this exhaust gas tract.
  • sensor elements 1 10 are shown in a simple, single-cell construction. As described above, however, more complex structures of the sensor elements 1 10 are possible, so constructions comprising a plurality of cells. In this regard, reference may be made to the prior art. The modification according to the invention of such more complex sensor elements 110 is readily apparent to the person skilled in the art.
  • FIGS. 1A and 1B show a first exemplary embodiment of the sensor element 110.
  • FIG. 1A shows a schematic sectional view
  • FIG. 1B shows a perspective view of the layer structure of the sensor element 110.
  • the sensor element 110 may include further, not shown in Figures 1 A and 1 B elements.
  • the sensor element 110 includes a first electrode 114, which in this exemplary embodiment is designed as an outer electrode and can be acted upon by the gas from the measurement gas space 1 12 via a protective layer 16.
  • a protective layer 116 for example, a highly porous ceramic material may be used, for example, alumina.
  • the sensor element 110 includes a solid electrolyte 1 18 with a solid electrolyte material 120.
  • this solid electrolyte material 120 may be zirconia as a matrix material doped with scandium oxide as a doping material. In principle, however, it is also possible to use other oxygen-conducting materials which are compatible with the remaining layer structure.
  • a second electrode 122 is arranged on the first electrode 114, which forms the outer electrode, opposite side of the solid electrolyte 1 18, a second electrode 122 is arranged.
  • This second electrode 122 can be arranged, for example, in the interior of a layer structure, so that further layers can follow below the second electrode 122.
  • this base layer 124 may also have a multilayer structure, so that, for example, a heating element may be integrated in this base layer 124. Preferably, this heating element for simple applications, such as two-wheeled, also be dispensed with.
  • the second electrode 122 is thus designed, for example, as an inner electrode.
  • the internal second electrode 122 which may also function as a reference electrode, may also be connected to a reference gas space.
  • FIG. 1B in addition, which is not shown in FIG. 1B, for example, comprise one or more reference air passages via which reference air can be applied to the second electrode 122.
  • it can be one or more reference air channels with a gas-permeable, highly porous material, which can be produced for example by means of a suitable printing technique.
  • the solid electrolyte material 120 may be configured as a solid electrolyte material with high oxygen ion conductivity, which can be achieved by a corresponding scandium doping. This may result in a for the operation of the sensor element
  • 1 10 required oxygen ion conductivity for example, already set usually at the exhaust tract of an internal combustion engine, such as a bicycle, temperatures occurring without an additional heating element is required.
  • this may include temperatures in the range between room temperature and 300 ° C., for example at 100 to 200 ° C. Since an increased doping of
  • the sensor element 1 10 comprises a carrier element 126.
  • the two electrodes 1 14, 122 and the solid electrolyte 118 connecting the electrodes 1 14, 122 together form a cell 128, for example a jump cell and / or a pump cell.
  • the sensor element 1 10 can provide, for example, corresponding driver circuits which require a corresponding operation.
  • this cell 128 is typically of lower mechanical stability than conventional cells used in common sensor elements 110.
  • the support member 126 accordingly provides mechanical stabilization of this cell 128.
  • the carrier element 126 in the exemplary embodiment illustrated in FIG. 1A and in FIG.
  • the carrier element 126 encloses the solid electrolyte material 120, which may, for example, have a thickness which is approximately the same or deviating from the material of the carrier element 126, that is to say in the form of a frame. This frame may also be fully or partially opened at one or more locations.
  • the carrier element 126 comprises a carrier material 132.
  • this carrier material 132 may be formed as a layer in the exemplary embodiment illustrated in FIGS. 1A and 1B, for example as a layer of a foil material, such that the carrier element 126 may be configured as a carrier layer 144, for example or may include such a carrier layer 144.
  • the carrier material 132 may, for example, likewise comprise ceramic zirconium dioxide, which however preferably has no doping or only a doping which causes the oxygen ion conductivity or in general the ion conductivity of the carrier material 132 to be lower than that of the solid electrolyte material 120.
  • the carrier material 132 may also For example, alumina, for example Al 2 O 3 include.
  • the carrier material 132 may be configured as an aluminum oxide foil.
  • this alumina has low ionic conductivity and low electronic conductivity.
  • the alumina may also contain admixtures.
  • the aluminum oxide can also be mixed with ZrO 2 just below a percolation limit in order to access it For example, to achieve better mechanical characteristics of the substrate 132.
  • electrode leads 134, 136 can be seen in FIG.
  • the first electrode feed line 134 is arranged on a side of the carrier element 126 facing the sample gas chamber 112 and contacts the first electrode 114.
  • the first electrode feed line 134 opens into a first connection contact 138.
  • the second electrode feed line 136 is on the side facing away from the sample gas space 112 arranged on the upper side of the support member 126, a second terminal contact 140 which is connected to the second electrode lead 136 via a support member 126 penetrating via 142 (in Figure 1 B only indicated).
  • the configuration of the carrier element 126 as a carrier element with insulating carrier material 132 has the effect that the insulation of this through-connection 142 can be greatly simplified or that such an insulation of the plated-through hole 142 can be completely dispensed with.
  • the insulation layers which are usually present between the electrode feed lines 134, 136 and the solid electrolyte 1 18 can also be dispensed with in whole or in part since, according to the invention, these electrode feed lines are arranged essentially on the carrier material 132 of the carrier element 126.
  • FIG. 2 shows, in a representation analogous to FIG. 1A, a second exemplary embodiment of a sensor element 110 according to the invention.
  • this sensor element 1 10 comprises a cell 128, which can be operated, for example, as a jump cell and / or as a pump cell.
  • the cell in turn comprises a first electrode 1 14, which via an optional porous protective layer 1 16 with gas from the
  • Measuring gas space 112 can be acted upon, an internal second electrode 122 and a solid electrolyte material 120 connecting the first electrode 1 14 and the second electrode 122.
  • the solid electrolyte material may comprise zirconium dioxide as the matrix material, for example, and one or more oxides of a preferably two or trivalent metal, for example scandium.
  • the solid electrolyte material 120 be configured with a higher oxygen ion conductivity than conventional solid electrolyte materials.
  • the sensor element 1 10 according to FIG. 2 has a carrier element 126.
  • this carrier element is not designed as a frame, but rather as a continuous carrier layer 144 onto which the cell 128 is applied.
  • the carrier layer 144 in turn comprises a carrier material 132.
  • it may in turn be one or more of the carrier materials illustrated above according to the exemplary embodiment in FIGS. 1A and 1B.
  • the entire structure of the sensor element 1 10 can be carried out in a similar manner to the structure shown in Figure 1 B.
  • the electrodes 1 14, 122 can in turn be contacted with corresponding electrode leads 134, 136, which, however, in this
  • Case are preferably arranged on the same side of the support member 126. In this case as well, it is again possible to dispense with insulation between the electrode leads 134, 136 and the carrier element 126, since this carrier element 126 is preferably made of an electrically insulating material. Also on plated-through holes 142 may be omitted.
  • the sensor element 110 according to FIG. 2 can contain additional elements, for example, in turn, one or more reference air channels, not shown in FIG.
  • the second electrode 122 which in this case can serve as a reference electrode, for example, with a known gas mixture composition, for example, outside air, are acted upon to produce in this way a known electrode potential at this second electrode 122.
  • a reference air channel can be used, for example in order to ensure an afterflow or an outflow of oxygen.
  • FIGS. 3A and 3B A third exemplary embodiment of a sensor element 110 according to the invention is shown in FIGS. 3A and 3B.
  • This sensor element 110 largely corresponds to the sensor element 110 according to the embodiment shown in FIGS. 1A and 1B.
  • this includes Sensor element 1 10 at least one cell 128 with a measuring gas chamber 1 12 facing first electrode 114 which is covered by a porous protective layer 1 16 and protected in this way from contamination.
  • the sensor element 110 comprises a second electrode 122 which, for example, can again be designed as an internal electrode. Also this inner second electrode
  • the two electrodes 114, 122 may in turn be connected to a reference air channel, which is not shown in Figures 3A and 3B.
  • the two electrodes 114, 122 are in turn connected to a solid electrolyte material 120 by a solid electrolyte 118.
  • a solid electrolyte material 120 With respect to the possible embodiments of the solid electrolyte material 120, reference may again be made, for example, to the above description.
  • the sensor element 110 in turn comprises at least one carrier element 126, which gives the at least one cell 128 mechanical stability.
  • the solid electrolyte 118 is not introduced into a simple opening 130, but rather a multiplicity of such openings 130 are provided in the carrier material 132 of the carrier element 126.
  • These openings 130 may, for example, have a round or polygonal cross-section and may be configured as bores in the carrier element 126.
  • the multiplicity of openings 130 can be arranged, for example, in the form of a regular or irregular matrix, as can be seen in particular from the illustration according to FIG. 3B.
  • each of these bores or openings 130 is completely filled with the solid electrolyte material 120.
  • a highly conductive solid electrolyte material 120 that is a material with high oxygen-ion-conducting properties, can be arranged in a network of filled openings 130, in which the total filled area is sufficiently large
  • the remaining structure of the sensor element 110 can largely correspond to the structure according to FIG. 1B.
  • a first electrode lead 134, a second electrode lead 136 and at least one through-connection 142 may be provided for contacting the electrodes 114 and 122, respectively.
  • insulating layers for insulating these elements relative to the carrier material 132 can again be dispensed with, at least to a large extent, since this is the case Support material 132 may again preferably not be designed to be conductive or only slightly conductive.

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Abstract

L'invention concerne un élément de détection (110) destiné à déterminer au moins une propriété d'un gaz dans un espace de gaz de mesure (112), notamment à détecter un composant gazeux dans un mélange gazeux. L'élément de détection (110) comporte au moins une cellule (128) pourvue d'au moins une première électrode (114), d'au moins une deuxième électrode (122) et d'au moins un électrolyte solide (118) contenant un matériau d'électrolyte solide (120), connectant la première électrode (114) et la deuxième (122). L'élément de détection (110) comporte également un élément support (129) contenant un matériau support (132), le matériau support (132) présentant une conductivité ionique inférieure à celle du matériau d'électrolyte solide (120). L'élément support (126) est conçu et disposé pour stabiliser mécaniquement la cellule (128).
PCT/EP2009/065268 2008-11-20 2009-11-17 Élément de détection comportant un élément support Ceased WO2010057867A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/129,956 US20110214989A1 (en) 2008-11-20 2009-11-17 Sensor element having a carrier element

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008043932.0 2008-11-20
DE102008043932A DE102008043932A1 (de) 2008-11-20 2008-11-20 Sensorelement mit Trägerelement

Publications (2)

Publication Number Publication Date
WO2010057867A2 true WO2010057867A2 (fr) 2010-05-27
WO2010057867A3 WO2010057867A3 (fr) 2010-10-21

Family

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Family Applications (1)

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PCT/EP2009/065268 Ceased WO2010057867A2 (fr) 2008-11-20 2009-11-17 Élément de détection comportant un élément support

Country Status (3)

Country Link
US (1) US20110214989A1 (fr)
DE (1) DE102008043932A1 (fr)
WO (1) WO2010057867A2 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
US20230404572A1 (en) * 2022-06-17 2023-12-21 Cilag Gmbh International Smart circular staplers

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010064299B4 (de) * 2010-12-29 2021-02-04 Robert Bosch Gmbh Sensor und Verfahren zum Betreiben eines Sensors
DE102013222022A1 (de) * 2013-10-30 2015-04-30 Robert Bosch Gmbh Verfahren und Vorrichtung zur Erkennung einer Wasserdurchfahrt mittels Abstandssensoren

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Publication number Priority date Publication date Assignee Title
JP3377016B2 (ja) * 1996-01-26 2003-02-17 矢崎総業株式会社 排気ガス中の酸素濃度測定用限界電流式酸素センサ
DE19751128A1 (de) * 1997-11-19 1999-05-20 Bosch Gmbh Robert Sensorelement und Verfahren zur Herstellung eines Sensorelements
US6572747B1 (en) * 1999-03-08 2003-06-03 Delphi Technologies, Inc. Method for making a wide range sensor element
DE10200052A1 (de) * 2002-01-03 2003-07-24 Bosch Gmbh Robert Sensorelement
US6936148B2 (en) * 2002-03-29 2005-08-30 Ngk Spark Plug Co., Ltd. Gas sensor element having at least two cells
GB0223273D0 (en) * 2002-10-08 2002-11-13 Sensox Ltd Sensors
TWI248511B (en) * 2004-05-04 2006-02-01 Ind Tech Res Inst Ceramic gas sensor
JP4548020B2 (ja) * 2004-07-06 2010-09-22 株式会社デンソー ジルコニア構造体およびその製造方法
US7722749B2 (en) * 2005-09-01 2010-05-25 Delphi Technologies, Inc. Gas sensor and method for forming same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230404572A1 (en) * 2022-06-17 2023-12-21 Cilag Gmbh International Smart circular staplers

Also Published As

Publication number Publication date
WO2010057867A3 (fr) 2010-10-21
US20110214989A1 (en) 2011-09-08
DE102008043932A1 (de) 2010-05-27

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