EP2847571A1 - Élément sensible présentant une couche de base en cermet et une couche de recouvrement en platine - Google Patents

Élément sensible présentant une couche de base en cermet et une couche de recouvrement en platine

Info

Publication number
EP2847571A1
EP2847571A1 EP13722336.8A EP13722336A EP2847571A1 EP 2847571 A1 EP2847571 A1 EP 2847571A1 EP 13722336 A EP13722336 A EP 13722336A EP 2847571 A1 EP2847571 A1 EP 2847571A1
Authority
EP
European Patent Office
Prior art keywords
sensor element
measuring electrode
platinum
ceramic
base layer
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.)
Withdrawn
Application number
EP13722336.8A
Other languages
German (de)
English (en)
Inventor
Johannes Ante
Markus Herrmann
Andreas Ott
Willibald Reitmeier
Manfred Weigl
Andreas Wildgen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Automotive GmbH
Original Assignee
Continental Automotive 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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of EP2847571A1 publication Critical patent/EP2847571A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/04—Testing internal-combustion engines
    • G01M15/10—Testing internal-combustion engines by monitoring exhaust gases or combustion flame
    • G01M15/102—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/06—Investigating concentration of particle suspensions
    • G01N15/0656—Investigating concentration of particle suspensions using electric, e.g. electrostatic methods or magnetic methods
    • 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
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N2015/0042—Investigating dispersion of solids
    • G01N2015/0046—Investigating dispersion of solids in gas, e.g. smoke

Definitions

  • the present invention relates to a sensor element for a sensor for detecting substances contained in a gas flow, in particular of soot particles in the exhaust gas of an internal combustion engine, with a support made of ceramic and an open-air gas jet arranged on the support. NEN measuring electrode.
  • Such a sensor element is known and described for example in DE 10 2010 044 308 AI. It is used in particular as a soot sensor in the exhaust system of diesel engines.
  • the measuring electrode By means of the measuring electrode, the proportion of soot particles contained in the exhaust gas flow is detected, for example via a resistance, capacitance or impedance measurement, and supplied in the form of electrical signals to a control device of the internal combustion engine.
  • the measuring electrode is in this case designed as an open, exposed to the gas flow electrode and has, for example, the shape of an interdigital electrode (comb electrode). It consists of fine conductor tracks, which are applied to a carrier made of ceramic, in particular imprinted.
  • the support is preferably formed as a plate-shaped elongated member and consists, as mentioned, of a ceramic material such as alumina.
  • the conductor track structure of the measuring electrode is provided with corresponding conductor connections, which lead to corresponding connection contacts.
  • Such sensor elements of Part. Kelsensoren are further provided with heating means to periodically clean the electrode exposed to the gas stream, on which the particles contained in the gas stream deposit with increasing measurement duration in an increasing manner. For this purpose, a heating takes place the measuring electrode and thereby a burning of the deposited particles, which are thereby removed from the measuring electrode.
  • the present invention has for its object to provide a sensor element of the type described above, the measuring electrode is characterized by a particularly good adhesion to the carrier in avoiding unwanted deposits.
  • the measuring electrode has a base layer arranged on the carrier, made of a ceramic-platinum cermet and a top layer of sintered platinum arranged on the base layer.
  • the combination of cermet base layer and platinum top layer according to the invention achieves optimum adhesion to the ceramic carrier and deposit protection. It has been shown that the cermet layer has a very good adhesion to the ceramic carrier. However, since such a layer is also associated with a very high deposition tendency by exhaust particles (ash, sulfur, metal oxides, etc.), it is poorly suited as a cover layer or contact layer with the gas stream. Experiments have shown here that after about 2,000 hours of operation strong deposits have occurred.
  • cover layer or contact layer is a layer of pure platinum. Such a layer has a good protection against unwanted deposits.
  • Cermet or cermets are a group of materials of two separate phases (of a metallic and a ceramic component), which differ in certain properties, in particular hardness, melting point, from each other.
  • An example of a ceramic-platinum cermet is a silicide-based one, such as a MoSi 2 -Pt cermet.
  • the base layer is made of a ceramic-platinum printing paste.
  • the measuring electrode is formed from a cermet base pressure and a platinum upper pressure.
  • the measuring electrode is preferably produced by a combined printing technique, whereby an increase in the adhesion of the measuring electrode to the ceramic carrier and a minimization of undesired deposits on the measuring electrode are achieved.
  • the sensor element designed according to the invention is used in particular in all sensors with open sensor contact materials, preferably in a soot sensor. dung.
  • the measuring electrode is preferably designed as an interdigital electrode (comb electrode).
  • the measuring electrode is designed to apply an alternating voltage. By applying an alternating voltage during operation of the measuring electrode, unwanted deposits can be further minimized.
  • a glass-bound platinum paste can also be used as the base coat.
  • Figure 1 is a schematic plan view of the sensor element of an interdigital sensor
  • FIG. 2 shows an enlarged partial section through the sensor element of FIG. 1.
  • FIG. 1 schematically shows a plan view of the sensor element 1 of an interdigital sensor, which is, for example, a soot sensor.
  • the measuring electrode 2 is formed in this sensor element as an interdigital electrode or comb electrode. It is formed at one end of the associated carrier 5 of the sensor element. Corresponding printed conductors of the measuring electrode 2 extend over a region 3 provided with an insulation into a contact region 4.
  • the measuring electrode 2 is formed as an open, the gas flow, for example, an exhaust system of a diesel engine, exposed electrode.
  • the corresponding conductor tracks are applied to the carrier 5 shown in FIG. in the
  • the measuring electrode 2 is made of a cermet basic pressure 6, which consists of a ceramic-platinum printing paste is manufactured, and a platinum-top pressure 7 together.
  • the measuring electrode 2 is thus produced by a combined printing technique.
  • the cermet base pressure increases the adhesion of the measuring electrode to the ceramic carrier, while the platinum top pressure minimizes unwanted deposits on the measuring electrode.

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Pathology (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Dispersion Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Measuring Fluid Pressure (AREA)
  • Measuring Oxygen Concentration In Cells (AREA)

Abstract

L'invention concerne un élément sensible servant à la détection de substances contenues dans un flux gazeux. L'élément sensible possède un support en céramique, et une électrode de mesure, découverte, exposée au flux gazeux, disposée sur le support. L'électrode de mesure présente une couche de base composée d'un cermet céramique-platine, disposée sur le support, et une couche de recouvrement, en platine fritté, disposée sur la couche de base. Ceci permet d'obtenir des propriétés particulièrement bonnes en ce qui concerne l'adhérence au support, et une protection contre les dépôts indésirables.
EP13722336.8A 2012-05-09 2013-05-02 Élément sensible présentant une couche de base en cermet et une couche de recouvrement en platine Withdrawn EP2847571A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012207761A DE102012207761A1 (de) 2012-05-09 2012-05-09 Sensorelement
PCT/EP2013/059090 WO2013167443A1 (fr) 2012-05-09 2013-05-02 Élément sensible présentant une couche de base en cermet et une couche de recouvrement en platine

Publications (1)

Publication Number Publication Date
EP2847571A1 true EP2847571A1 (fr) 2015-03-18

Family

ID=48430697

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13722336.8A Withdrawn EP2847571A1 (fr) 2012-05-09 2013-05-02 Élément sensible présentant une couche de base en cermet et une couche de recouvrement en platine

Country Status (6)

Country Link
US (1) US20150300919A1 (fr)
EP (1) EP2847571A1 (fr)
JP (1) JP2015519558A (fr)
CN (1) CN104285141A (fr)
DE (1) DE102012207761A1 (fr)
WO (1) WO2013167443A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012207761A1 (de) * 2012-05-09 2013-11-14 Continental Automotive Gmbh Sensorelement
DE102016101247A1 (de) 2015-11-02 2017-05-04 Epcos Ag Sensorelement und Verfahren zur Herstellung eines Sensorelements
US20180073973A1 (en) 2016-09-12 2018-03-15 Hyundai Motor Company Particulate matters sensor device and manufacturing method of sensor unit provided in this

Family Cites Families (24)

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JPS5734447A (en) * 1980-08-12 1982-02-24 Nissan Motor Co Ltd Production of film structure oxygen sensor element
JPS60108745A (ja) * 1983-11-18 1985-06-14 Ngk Insulators Ltd 電気化学的装置
JPH01203964A (ja) * 1988-02-10 1989-08-16 Toyota Motor Corp 酸素濃度センサ用電極の形成方法
DE4240267C2 (de) * 1992-12-01 2003-03-20 Bosch Gmbh Robert Hochaktive Elektroden für Abgassensoren
US5698267A (en) * 1992-12-01 1997-12-16 Robert Bosch Gmbh Method for fabricating high-activity electrodes for exhaust gas sensors
JP3481344B2 (ja) * 1995-04-19 2003-12-22 日本碍子株式会社 排ガス浄化用触媒の劣化検知方法及びそのためのシステム
US6627259B1 (en) * 1997-09-10 2003-09-30 Oliver Jevons Masking tapes and application methods
US20030138845A1 (en) * 2001-08-23 2003-07-24 Changming Li Protein and peptide sensors using electrical detection methods
US6634210B1 (en) * 2002-04-17 2003-10-21 Delphi Technologies, Inc. Particulate sensor system
US7453254B2 (en) * 2003-07-25 2008-11-18 Paragon Ag Microstructured chemical sensor
US20060176350A1 (en) * 2005-01-14 2006-08-10 Howarth James J Replacement of passive electrical components
JP2007121173A (ja) * 2005-10-31 2007-05-17 Denso Corp ガスセンサ素子及びその製造方法
DE102005053120A1 (de) * 2005-11-08 2007-05-10 Robert Bosch Gmbh Sensorelement für Gassensoren und Verfahren zum Betrieb desselben
DE102006048354A1 (de) * 2006-10-12 2008-04-17 Robert Bosch Gmbh Verfahren und Vorrichtung zur Bestimmung von Bestandteilen eines Gasgemisches
DE102007039567A1 (de) * 2007-08-22 2009-02-26 Robert Bosch Gmbh Gassensor
US9140159B2 (en) * 2007-09-18 2015-09-22 Eugene V. Gonze High exhaust temperature, zoned, electrically-heated particulate matter filter
JP5051660B2 (ja) * 2008-01-08 2012-10-17 日本特殊陶業株式会社 ガスセンサ素子及びガスセンサ
JP5115247B2 (ja) * 2008-03-06 2013-01-09 株式会社デンソー ガスセンサ素子
JP4512658B2 (ja) * 2008-07-04 2010-07-28 日本碍子株式会社 粒子状物質検出装置
DE102008054617A1 (de) * 2008-12-15 2010-06-17 Robert Bosch Gmbh Strukturierte Elektrode für keramische Sensorelemente
DE102009000319A1 (de) * 2009-01-20 2010-07-22 Robert Bosch Gmbh Teilchensensor
JP2011080781A (ja) * 2009-10-05 2011-04-21 Nippon Soken Inc パティキュレート検出素子及びこれを用いたパティキュレート検出センサ
DE102010044308A1 (de) 2010-09-03 2012-03-08 Continental Automotive Gmbh Sensorelement für einen Partikelsensor
DE102012207761A1 (de) * 2012-05-09 2013-11-14 Continental Automotive Gmbh Sensorelement

Non-Patent Citations (1)

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Title
See references of WO2013167443A1 *

Also Published As

Publication number Publication date
DE102012207761A1 (de) 2013-11-14
WO2013167443A1 (fr) 2013-11-14
US20150300919A1 (en) 2015-10-22
CN104285141A (zh) 2015-01-14
JP2015519558A (ja) 2015-07-09

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