WO1998045696A1 - Sealing element for sensors - Google Patents

Sealing element for sensors Download PDF

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Publication number
WO1998045696A1
WO1998045696A1 PCT/DE1998/000902 DE9800902W WO9845696A1 WO 1998045696 A1 WO1998045696 A1 WO 1998045696A1 DE 9800902 W DE9800902 W DE 9800902W WO 9845696 A1 WO9845696 A1 WO 9845696A1
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WO
WIPO (PCT)
Prior art keywords
sealing element
housing
seal according
molded part
sealing
Prior art date
Application number
PCT/DE1998/000902
Other languages
German (de)
French (fr)
Inventor
Helmut Weyl
Hans-Martin Wiedenmann
Anton Hans
Johann Wehrmann
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to CN98800424A priority Critical patent/CN1222975A/en
Priority to GB9826887A priority patent/GB2330207A/en
Priority to JP10542228A priority patent/JP2000511645A/en
Publication of WO1998045696A1 publication Critical patent/WO1998045696A1/en

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Classifications

    • 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

Definitions

  • the invention relates to a seal for a sensor element of a gas sensor according to the preamble of the main claim.
  • a seal for example from DE 195 32 090, in which the sensor element is mounted in a longitudinal bore of a housing by means of at least two sealing bodies and a deformable additional seal arranged between the sealing bodies.
  • the two sealing bodies consist of magnesium aluminum silicate or steatite and the one installed between these sealing bodies
  • Sealing body made of the hexagonal allotrope of boron nitride.
  • main claim has the advantage that it is both gas-tight and impermeable to liquids, in particular for fuels, and also has a very high temperature resistance. This is accomplished by a mixture of the hexagonal allotrope of boron nitride (BN) and at least one oxide ceramic component.
  • BN hexagonal allotrope of boron nitride
  • oxide ceramic component and BN instead of a sealing structure made of sealing elements of different chemical compositions has simplified handling and assembly.
  • steatite the combustion product of soapstone with the approximate chemical formula 3 M "0 • 4 SiO 2 ⁇ H 2 0 that is used in a mixture with the hexagonal allotropes of BN.
  • This ensures a particularly high temperature stability.
  • boron nitride the hexagonal allotrope of which is a very fine-grained and, similar to its isosteric graphite, a well deformable connection, the tightness is significantly improved.
  • the BN content in the sealing element is 5 to 10 percent by weight.
  • Good handling during assembly of the seal is achieved if the steatite / BN sealing body is used in the presintered state and is deformed by the action of a force during assembly in such a way that the material of the sealing body or seals contacts the sensor element and the housing and thus the sensor element is kept gas-tight in the housing.
  • Figure 1 shows a cross section through a
  • the single figure shows a gas sensor 10, for example an electrochemical oxygen sensor, which has a metallic housing 12 which has a thread 13 as a fastening means for installation in a measuring gas tube, not shown.
  • the housing 12 has a longitudinal bore 15 with a shoulder-shaped ring surface 16.
  • On the shoulder-shaped ring surface 16 there is, for example, a metallic sealing ring 18 on which a measuring gas-side ceramic molded part 21 rests.
  • the measuring gas-side ceramic molding 21 has a continuous measuring gas-side opening 22 running in the direction of the longitudinal bore 15.
  • a connection-side ceramic molding 23 is also arranged in the longitudinal bore 15.
  • connection-side molded ceramic part 23 also has a centrally arranged and continuous connection-side opening 24 running in the direction of the longitudinal bore 15.
  • connection-side opening 24 running in the direction of the longitudinal bore 15.
  • plate-shaped sensor element 27 with an end section 28 on the measuring gas side and an end section 29 on the connection side.
  • the measuring gas-side end section 28 of the sensor element 27 protrudes from the housing 11 and is surrounded by a protective tube 31 which is fixed to the housing 11.
  • the protective tube 31 has inlet and outlet openings 32 for the gas to be measured.
  • the connection-side end section 29 has connection contacts 34 which also protrude from the housing 11.
  • the connection contacts 34 are contacted with a contact plug, not shown, provided with connection cables.
  • the connection-side end section 29 protruding from the housing 11 is surrounded by an encapsulation, not shown, which protects the end section 29 from environmental influences.
  • a seal 37 consisting of a BN / steatite mixture. Boron nitride is present as a hexagonal allotrope and has, for example, a share of 10% by weight in the sealing element 37.
  • the ceramic molded part 23 on the connection side presses on this sealing element 37.
  • the contact pressure of the ceramic molded part 23 on the connection side is applied by a metal sleeve 40.
  • the metal sleeve 40 has, for example, evenly distributed a plurality of claws 41 which point inwards and which engage in notches 42 formed in the housing 12. However, it is also conceivable to weld the metal sleeve 40 to the housing 12. That from the
  • Bn / steatite mixture existing sealing element 37 is sintered before installation in the longitudinal bore 15 of the housing 12 preformed into a ring at a low temperature of, for example, 500 ° C.
  • the annular sealing element 37 formed in this way is inserted, according to the exemplary embodiment, into the longitudinal bore 15 which already contains the sensor element 27.
  • the connection-side molded ceramic part 23 is then arranged over the seal 37.
  • the metal sleeve 40 is placed on the connection-side ceramic molded part. A force is then exerted on the metal sleeve 40, for example by means of a stamp, which is applied to the ceramic molded part 23 on the connection side
  • Sealing element 37 acts.
  • the prefabricated ring of the sealing element 37 is deformed such that the material of the sealing element 37 presses against the sensor element 27 and the housing 12.
  • sealing element 37 is not limited to the sealing of planar sensor elements in metallic housings. It is entirely conceivable to use such a sealing element 37 also for sealing so-called finger probes. In this application, the execution of the prefabricated ring for the sealing element 37 then only has to be adapted to the geometry of the longitudinal bore and the contact surface between the housing and the finger-shaped sensor element.

Abstract

The invention relates to a seal for a sensor element (27) belonging to a gas detector (10), specially to determine the oxygen content in exhaust gases from internal combustion engines. The inventive seal comprises at least one sealing element (37) inserted into a longitudinal bore (15) of a housing (12) consisting of a mixture of the hexagonal allotrope of boron nitride (BN) and an oxide ceramic component, preferably steatite.

Description

Dichtelement für SensorenSealing element for sensors
Stand der TechnikState of the art
Die Erfindung geht aus von einer Dichtung für ein Sensorelement eines Gassensors nach der Gattung des Hauptanspruches. Eine derartige Dichtung ist beispielsweise aus der DE 195 32 090 bekannt, bei der das Sensorelement in einer Längsbohrung eines Gehäuses mittels mindestens zweier Dichtkörper und einer zwischen den Dichtkörpern angeordneten verformbaren Zusatzdichtung angebracht ist. Die beiden Dichtkörper bestehen aus Magnesiumaluminiumsilicat oder Steatit und der zwischen diesen Dichtkörpern angebrachteThe invention relates to a seal for a sensor element of a gas sensor according to the preamble of the main claim. Such a seal is known for example from DE 195 32 090, in which the sensor element is mounted in a longitudinal bore of a housing by means of at least two sealing bodies and a deformable additional seal arranged between the sealing bodies. The two sealing bodies consist of magnesium aluminum silicate or steatite and the one installed between these sealing bodies
Dichtkörper aus dem hexagonalen Allotropen des Bornitrides.Sealing body made of the hexagonal allotrope of boron nitride.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Dichtung mit den kennzeichnendenThe seal according to the invention with the characteristic
Merkmalen des Hauptanspruchs hat den Vorteil, daß sie sowohl gasdicht als auch für Flüssigkeiten, insbesondere für Kraftstoffe, undurchlässig ist und darüber hinaus eine sehr hohe Temperaturbeständigkeit aufweist. Dies wird erreicht durch eine Mischung aus dem hexagonalen Allotropen des Bornitrides (BN) und wenigstens einer oxidkeramischen Komponente. Darüberhinaus weist die Verwendung einer Mischung aus der oxidkeramischen Komponente und BN anstelle eines Dichtungsaufbaus aus Dichtelementen verschiedener chemischer Zusamensetzung eine vereinfachte Handhabung und Montage auf .Features of the main claim has the advantage that it is both gas-tight and impermeable to liquids, in particular for fuels, and also has a very high temperature resistance. This is accomplished by a mixture of the hexagonal allotrope of boron nitride (BN) and at least one oxide ceramic component. In addition, the use of a mixture of the oxide ceramic component and BN instead of a sealing structure made of sealing elements of different chemical compositions has simplified handling and assembly.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Ausbildungen und Weiterbildungen der erfindungsgemäßen Dichtung möglich.The measures listed in the subclaims allow advantageous developments and developments of the seal according to the invention.
In besonders vorteilhafter Weise wird Steatit, d. h. das Brennprodukt des Specksteins mit der ungefähren chemischen Formel 3 M„0 • 4 SiÜ2 ■ H20 in einer Mischung mit dem hexagonalen Allotropen von BN verwendet. Damit wird eine besonders hohe Temperaturstabilität gewährleistet. Durch die Verwendung von Bornitrid, dessen hexagonales Allotropes eine sehr feinkörnige und, ähnlich seinem Isosteren Graphit, eine gut verformbare Verbindung ist wird die Dichtigkeit entscheidend verbessert.In a particularly advantageous manner, steatite, the combustion product of soapstone with the approximate chemical formula 3 M "0 • 4 SiO 2 ■ H 2 0 that is used in a mixture with the hexagonal allotropes of BN. This ensures a particularly high temperature stability. Through the use of boron nitride, the hexagonal allotrope of which is a very fine-grained and, similar to its isosteric graphite, a well deformable connection, the tightness is significantly improved.
In besonders bevorzugter Ausführung beträgt der BN-Anteil im Dichtelement 5 bis 10 Gewichtsprozent. Eine gute Handhabbarkeit bei der Montage der Dichtung wird erreicht, wenn der Steatit/BN Dichtkörper im vorgesinterten Zustand eingesetzt wird und durch das Einwirken einer Kraft bei der Montage sich derart verformt, daß sich das Material des oder der Dichtkörper an das Sensorelement und das Gehäuse anlegt und somit das Sensorelement im Gehäuse gasdicht gehalten wird. ZeichnungIn a particularly preferred embodiment, the BN content in the sealing element is 5 to 10 percent by weight. Good handling during assembly of the seal is achieved if the steatite / BN sealing body is used in the presintered state and is deformed by the action of a force during assembly in such a way that the material of the sealing body or seals contacts the sensor element and the housing and thus the sensor element is kept gas-tight in the housing. drawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Figur 1 zeigt einen Querschnitt durch einenAn embodiment of the invention is shown in the drawing and explained in more detail in the following description. Figure 1 shows a cross section through a
Gassensor mit einer erfindungsgemäßen Dichtungsanordnung.Gas sensor with a sealing arrangement according to the invention.
AusführungsbeispielEmbodiment
Die einzige Figur zeigt einen Gassensor 10, beispielsweise einen elektrochemischen Sauerstoffsensor, der ein metallisches Gehäuse 12 besitzt, das ein Gewinde 13 als Befestigungsmittel für den Einbau in ein nicht dargestelltes Meßgasrohr aufweist. Das Gehäuse 12 hat eine Längsbohrung 15 mit einer schulterförmigen Ringfläche 16. Auf der schulterförmigen Ringfläche 16 befindet sich beispielsweise ein metallischer Dichtring 18, auf dem ein meßgasseitiges Keramikformteil 21 aufliegt. Das meßgasseitige Keramikformteil 21 hat in Richtung der Längsbohrung 15 verlaufend einen durchgehenden meßgasseitigen Durchbruch 22. Beabstandet vom meßgasseitigen Keramikformteil 21 ist in der Längsbohrung 15 ferner ein anschlußseitiges Keramikformteil 23 angeordnet. Das anschlußseitige Keramikformteil 23 hat ebenfalls in Richtung der Längsbohrung 15 verlaufend einen zentral angeordneten und durchgehenden anschlußseitigen Durchbruch 24. Der meßgasseitige Durchbruch 22 des meßgasseitigen Keramikformteils 21 und der anschlußseitige Durchbruch 24 des anschlußseitigen Keramikformteils 23 verlaufend fluchtend zueinander. In den Durchbrüchen 22, 24 befindet sich ein plättchenförmiges Sensorelement 27 mit einem meßgasseitigen Endabschnitt 28 und einem anschlußseitigen Endabschnitt 29.The single figure shows a gas sensor 10, for example an electrochemical oxygen sensor, which has a metallic housing 12 which has a thread 13 as a fastening means for installation in a measuring gas tube, not shown. The housing 12 has a longitudinal bore 15 with a shoulder-shaped ring surface 16. On the shoulder-shaped ring surface 16 there is, for example, a metallic sealing ring 18 on which a measuring gas-side ceramic molded part 21 rests. The measuring gas-side ceramic molding 21 has a continuous measuring gas-side opening 22 running in the direction of the longitudinal bore 15. At a distance from the measuring gas-side ceramic molding 21, a connection-side ceramic molding 23 is also arranged in the longitudinal bore 15. The connection-side molded ceramic part 23 also has a centrally arranged and continuous connection-side opening 24 running in the direction of the longitudinal bore 15. In the openings 22, 24 there is a plate-shaped sensor element 27 with an end section 28 on the measuring gas side and an end section 29 on the connection side.
Der meßgasseitige Endabschnitt 28 des Sensorelements 27 ragt aus dem Gehäuse 11 heraus und ist von einem Schutzrohr 31 umgeben, das am Gehäuse 11 festgelegt ist. Das Schutzrohr 31 weist Ein- und Austrittsöffnungen 32 für das zu messende Gas auf. Der anschlußseitige Endabschnitt 29 besitzt Anschlußkontakte 34, die ebenfalls aus dem Gehäuse 11 herausragen. Die Anschlußkontakte 34 werden mit einem nicht dargestellten mit Anschlußkabeln versehenen Kontaktstecker kontaktiert. Der aus dem Gehäuse 11 herausragende anschlußseitige Endabschnitt 29 ist von einer nicht dargestellten Umkapselung umgeben, die den Endabschnitt 29 vor Umgebungseinflüssen schützt.The measuring gas-side end section 28 of the sensor element 27 protrudes from the housing 11 and is surrounded by a protective tube 31 which is fixed to the housing 11. The protective tube 31 has inlet and outlet openings 32 for the gas to be measured. The connection-side end section 29 has connection contacts 34 which also protrude from the housing 11. The connection contacts 34 are contacted with a contact plug, not shown, provided with connection cables. The connection-side end section 29 protruding from the housing 11 is surrounded by an encapsulation, not shown, which protects the end section 29 from environmental influences.
Zwischen dem meßgasseitigen Keramikformteil 21 und dem anschlußseitigen Keramikformteil 23 befindet sich eine Dichtung 37, bestehend aus einer BN/Steatit-Mischung. Bornitrid liegt als hexagonales Allotrope vor, und hat beispielsweise einen Anteil von 10 Gew.% an dem Dichtelement 37. Auf dieses Dichtelement 37 drückt das anschlußseitige Keramikformteil 23. Die Anpreßkraft des anschlusseitigen Keramikformteils 23 wird von einer Metallhülse 40 aufgebracht. Die Metallhülse 40 hat beispielsweise gleichmäßig verteilt mehrere, nach innen weisende Krallen 41, die in am Gehäuse 12 eingeformten Einkerbungen 42 eingreifen. Es ist aber auch denkbar, die Metallhülse 40 mit dem Gehäuse 12 zu verschweißen. Das aus derBetween the measuring gas-side ceramic molding 21 and the connection-side ceramic molding 23 there is a seal 37 consisting of a BN / steatite mixture. Boron nitride is present as a hexagonal allotrope and has, for example, a share of 10% by weight in the sealing element 37. The ceramic molded part 23 on the connection side presses on this sealing element 37. The contact pressure of the ceramic molded part 23 on the connection side is applied by a metal sleeve 40. The metal sleeve 40 has, for example, evenly distributed a plurality of claws 41 which point inwards and which engage in notches 42 formed in the housing 12. However, it is also conceivable to weld the metal sleeve 40 to the housing 12. That from the
Bn/Steatitmischung bestehende Dichtelement 37 wird vor dem Einbau in die Längsbohrung 15 des Gehäuses 12 durch Sintern bei einer niedrigen Temperatur von beispielsweise 500°C zu einem Ring vorgeformt. Das so gebildete ringförmige Dichtelement 37 wird entsprechend dem Ausfuhrungsbeispiel in die das Sensorelement 27 bereits enthaltende Längsbohrung 15 eingesetzt. Über der Dichtung 37 wird dann das anschlußseitige Keramikformteil 23 angeordnet. Danach wird auf das anschlußseitige Keramikformteil die Metallhülse 40 aufgesetzt. Anschließend wird beispielsweise mittels eines Stempels eine Kraft auf die Metallhülse 40 ausgeübt, die über das anschlußseitige Keramikformteil 23 auf dasBn / steatite mixture existing sealing element 37 is sintered before installation in the longitudinal bore 15 of the housing 12 preformed into a ring at a low temperature of, for example, 500 ° C. The annular sealing element 37 formed in this way is inserted, according to the exemplary embodiment, into the longitudinal bore 15 which already contains the sensor element 27. The connection-side molded ceramic part 23 is then arranged over the seal 37. Then the metal sleeve 40 is placed on the connection-side ceramic molded part. A force is then exerted on the metal sleeve 40, for example by means of a stamp, which is applied to the ceramic molded part 23 on the connection side
Dichtelement 37 einwirkt. Dabei wird der vorgefertigte Ring des Dichtelements 37 derart verformt, daß sich das Material des Dichtelementes 37 an das Sensorelement 27 und das Gehäuse 12 anpreßt .Sealing element 37 acts. The prefabricated ring of the sealing element 37 is deformed such that the material of the sealing element 37 presses against the sensor element 27 and the housing 12.
Es hat sich gezeigt, daß die Dichtwirkung im wesentlichen von dem Anteil des hexagonalen BN-Allotropen bestimmt wird.It has been shown that the sealing effect is essentially determined by the proportion of the hexagonal BN allotrope.
Wesentlich für die Erzielung einer Gas- und Kraftstoffdichtheit über einen weiten Temperaturbereich ist, daß auf das Dichtungselement 37 ständig eine von der Metallhülse 40 ausgehende Kraft einwirkt. Aufgrund des höheren thermischen Ausdehnungskoeffizienten von Steatit (8,8 x 10"6 K"1) gegenüber Bornitrid (ca. 4,4 x 10"6K_1) wird durch die entsprechende Mischung beider Komponenten erreicht, daß auch bei höheren Temperaturen die von der Metallhülse 40 ausgehende Anpreßkraft auf das Dichtelement 37 einwirkt.It is essential for achieving gas and fuel tightness over a wide temperature range that a force emanating from the metal sleeve 40 is constantly acting on the sealing element 37. Due to the higher thermal expansion coefficient of steatite (8.8 x 10 "6 K " 1 ) compared to boron nitride (approx. 4.4 x 10 "6 K _1 ), the appropriate mixture of both components ensures that even at higher temperatures that of the metal sleeve 40 exerting contact force acts on the sealing element 37.
Die Verwendung des erfindungsgemäßen Dichtelements 37 ist nicht auf die Abdichtung von planaren Sensorelementen in metallischen Gehäusen beschränkt. Es ist durchaus denkbar, ein derartiges Dichtelement 37 auch zum Abdichten von sogenannten Fingersonden einzusetzen. Bei diesem Anwendungsfall muß dann lediglich die Ausführung des vorgefertigten Ringes für das Dichtelement 37 der Geometrie der Längsbohrung und der Auflagefläche zwischen Gehäuse und fingerförmigem Sensorelement angepaßt werden. The use of the sealing element 37 according to the invention is not limited to the sealing of planar sensor elements in metallic housings. It is entirely conceivable to use such a sealing element 37 also for sealing so-called finger probes. In this application, the execution of the prefabricated ring for the sealing element 37 then only has to be adapted to the geometry of the longitudinal bore and the contact surface between the housing and the finger-shaped sensor element.

Claims

Ansprüche Expectations
1. Dichtung für ein Sensorelement eines Gassensors, insbesondere zur Bestimmung des Sauerstoffgehaltes in Abgasen von Verbrennungsmotoren, welche das Sensorelement in einer Längsbohrung eines metallischen Gehäuses abdichtet, dadurch gekennzeichnet, daß eine Dichtanordnung aus mindestens einem Dichtelement (37) vorgesehen ist, und daß das Dichtelement (37) aus einer Mischung von Bornitrid (BN) und wenigstens einer oxidkeramischen Verbindung besteht.1. Seal for a sensor element of a gas sensor, in particular for determining the oxygen content in exhaust gases from internal combustion engines, which seals the sensor element in a longitudinal bore of a metallic housing, characterized in that a sealing arrangement of at least one sealing element (37) is provided, and that the sealing element (37) consists of a mixture of boron nitride (BN) and at least one oxide ceramic compound.
2. Dichtung nach Anspruch 1, dadurch gekennzeichnet daß die oxidkeramische Verbindung im wesentlichen Steatit ist.2. Seal according to claim 1, characterized in that the oxide ceramic compound is essentially steatite.
3. Dichtung nach Anspruch 1, dadurch gekennzeichnet, daß das hexagonale Allotrope von BN vorliegt.3. Seal according to claim 1, characterized in that the hexagonal allotrope of BN is present.
4. Dichtung nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß der BN-Anteil im Dichtelement (37) 5 bis 10 Gew.% beträgt .4. Seal according to claim 1 to 3, characterized in that the BN portion in the sealing element (37) is 5 to 10 wt.%.
5. Dichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Dichtelement (37) als verformbarer Körper eingesetzt und in die Längsbohrung des Gehäuses (22) eingepreßt ist, wobei sich beim Verpressen der Körper derart verformt, daß sich das Material des Dichtelementes an das Sensorelement (27) und das Gehäuse (12) anpreßt.5. Seal according to claim 1, characterized in that the sealing element (37) is used as a deformable body and is pressed into the longitudinal bore of the housing (22), the body being deformed in such a way that the body is deformed during the pressing presses the material of the sealing element onto the sensor element (27) and the housing (12).
6. Dichtung nach Anspruch 1, dadurch gekennzeichnet, daß in der Längsbohrung des Gehäuses (12) beabstandet voneinander ein meßgasseitiges Keramikformteil (22) und ein anchlußseitiges Keramikformteil (23) angeordnet sind und daß zwischen den beiden Keramikteilen das Dichtelement (37) angeordnet ist.6. Seal according to claim 1, characterized in that a measuring gas-side ceramic molded part (22) and a connection-side ceramic molded part (23) are arranged in the longitudinal bore of the housing (12) and that the sealing element (37) is arranged between the two ceramic parts.
7. Dichtung nach Anspruch 6, dadurch gekennzeichnet, daß ein mit dem Gehäuse verbundenes Druckelement (40) vorgesehen ist, welches auf das anschlußseitige Keramikformteil (23) drückt .7. Seal according to claim 6, characterized in that a pressure element (40) connected to the housing is provided, which presses on the connection-side ceramic molded part (23).
8. Verfahren zur Herstellung einer Dichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Mischung des Dichtelementes (37) aus BN und der oxidkeramischen Komponente zu einem Formteil gepreßt und anschließend gesintert wird, derart, daß das Formteil unter Einwirkung einer Preßkraft bei der Montage des Gassensors in seinen Pulverbestandteilen verformt wird. 8. A method for producing a seal according to one of the preceding claims, characterized in that the mixture of the sealing element (37) made of BN and the oxide ceramic component is pressed into a molded part and then sintered, such that the molded part under the action of a pressing force at the Assembly of the gas sensor is deformed in its powder components.
PCT/DE1998/000902 1997-04-07 1998-03-28 Sealing element for sensors WO1998045696A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN98800424A CN1222975A (en) 1997-04-07 1998-03-28 Sealing element for sensors
GB9826887A GB2330207A (en) 1997-04-07 1998-03-28 Sealing element for sensors
JP10542228A JP2000511645A (en) 1997-04-07 1998-03-28 Seal member for sensor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19714203A DE19714203C2 (en) 1997-04-07 1997-04-07 Sealing element for sensors
DE19714203.6 1997-04-07

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Publication Number Publication Date
WO1998045696A1 true WO1998045696A1 (en) 1998-10-15

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KR (1) KR20000016317A (en)
CN (1) CN1222975A (en)
DE (1) DE19714203C2 (en)
GB (1) GB2330207A (en)
WO (1) WO1998045696A1 (en)

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DE19714203A1 (en) 1998-10-15
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DE19714203C2 (en) 2000-06-29
CN1222975A (en) 1999-07-14

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