EP0895593A1 - Sensorelement und verfahren zu dessen herstellung - Google Patents
Sensorelement und verfahren zu dessen herstellungInfo
- Publication number
- EP0895593A1 EP0895593A1 EP97949979A EP97949979A EP0895593A1 EP 0895593 A1 EP0895593 A1 EP 0895593A1 EP 97949979 A EP97949979 A EP 97949979A EP 97949979 A EP97949979 A EP 97949979A EP 0895593 A1 EP0895593 A1 EP 0895593A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sensor element
- crystalline
- metallic material
- glass
- insulation 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- Withdrawn
Links
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
-
- 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
- G01N27/4071—Cells and probes with solid electrolytes for investigating or analysing gases using sensor elements of laminated structure
Definitions
- the invention is based on a sensor element and a method for its production according to the preamble of the main claim. From DE-OS 43 42 731 a gas sensor with a tubular sensor element in the so-called.
- Known finger design in which a conductor track running on the outside of the tubular sensor element is covered by an electrically insulating layer which is formed from a mixture of a crystalline, non-metallic material and a glass-forming material, with a glaze filled with the crystalline, non-metallic material when heated arises.
- DE-PS 29 07 032 discloses a planar sensor element for determining the oxygen content in gases, in which a measuring cell is connected to a resistance heating element via an Al2O3 insulation layer.
- the ceramic heater insulation consisting of A1 2 0 3 is electrically insulating and is used to compensate for the different
- the gas sensor according to the invention with the characterizing features of claim 1 has the advantage that the insulation layer is gas-tight, good electrical insulation, good adhesive strength with the insulation layer
- Solid electrolyte ceramic and has good thermal conductivity.
- the good adhesive strength results in particular from the fact that the sintering shrinkage of the material of the insulation layer corresponds approximately to the sintering shrinkage of the material of the solid electrolyte ceramic.
- the sintering temperature can be reduced from approximately 1600 ° C to up to 1250 ° C.
- the melting temperature of the glass-forming material used is the limit for the sintering temperature, so that a glaze filled with the crystalline, non-metallic material, for example Al 2 O 3, forms.
- a particularly suitable insulation layer is achieved with a proportion of crystalline, non-metallic material of 60% by weight and a proportion of glass-forming material of 40% by weight in the raw material mixture.
- FIG. 1 shows a cross section through the exhaust-side part of a sensor element and
- FIG. 2 shows an exploded view of the layer system of the sensor element according to FIG. 1.
- the platelet-shaped sensor element 10 shown in FIGS. 1 and 2 has an electrochemical measuring cell 12 and a heating element 13.
- the measuring cell 12 has, for example, a first solid electrolyte foil 21 with a large surface 22 on the measuring gas side and a large surface 23 on the reference gas side, and a second solid electrolyte foil 25 with a reference channel 26 integrated therein.
- Large area 22 has a measuring electrode 31 with a conductor track 32 and a first connection contact 33.
- a reference electrode 35 with a conductor track 36 is located on the reference gas-side large surface 23 of the first solid electrolyte film 21.
- a via 38 is also provided in the first solid electrolyte film 21, through which the conductor track 36
- Reference electrode 35 is guided to the large surface 22 on the measuring gas side.
- a second connection contact 39 on the large surface 22, which is connected to the via 38 and thus forms the contact point for the reference electrode 35.
- the measuring electrode 31 is covered with a porous protective layer 28.
- the heating element 14 has, for example, a carrier film 41 with an outer large area 43 and an inner large area 43 ', which in the present exemplary embodiment consists of the material of the two solid electrolyte films 21, 25.
- An outer insulation layer 42 is applied to the inner large surface 43 'of the carrier film 41.
- On the outer insulation layer 42 there is a resistance heater 44 with a meandering heating conductor 45 and with two connecting conductors 46.
- the outer insulation layer 42 and the carrier film 41 each have two heater through-contacts 48 which run in alignment with one another and which run from the two connecting conductors 46 to the outer large surface 43 of the carrier film 41 lead.
- two heater connection contacts 49 are arranged, which are connected to the heater through-contacts 48.
- An inner insulation layer 50 is located on the resistance heater 44.
- the large area of the inner insulation layer 50 is connected to the large area of the second solid electrolyte film 25.
- the heating element 14 is thermally coupled to the measuring cell 12 via the inner insulation layer 50.
- Carrier film 41 consist, for example, of ZrC> 2 partially stabilized with 5 mol% Y2O3.
- the electrodes 31, 35, the conductor tracks 32, 36, the plated-through holes 38 and the connection contacts 33, 39 consist, for example, of a platinum cermet.
- a platinum cermet is also used as the material for the resistance heater, the ohmic resistance of the supply lines 46 being chosen to be lower than for the heating conductor 45.
- composition can vary as follows:
- Powder mixture 20 to 70 wt.%
- Solvent 20 to 70 wt.%
- Plasticizer 1 to 15 wt.%
- Binder 1 to 15 wt.%.
- Hexanol for example, is used as solvent, phthalate, for example, as plasticizer, and polyvinyl butyral, for example, is used as binder.
- the raw material components are in suitable
- the powder mixture consists, for example, of Al2O3 (alumina) with a specific sintering activity and of a glass-forming material, for example an alkaline earth silicate glass.
- a glass-forming material for example an alkaline earth silicate glass.
- Ba-Al silicate for example, is used as the alkaline earth silicate glass.
- the barium can be replaced by strontium up to 30 atomic%.
- the alkaline earth silicate glass can be introduced as a pre-melted glass frit or as a glass phase-raw material mixture.
- the material mixture may contain electrically conductive impurities up to a maximum of 1% by weight. This applies in particular to Na 2 0, K 2 0, Fe 2 0 3 , Ti0 2 , Cu 2 0 or the like semiconducting oxides. Most of time the content of electrically conductive impurities in the commercially available raw materials is below 0.2% by weight
- the alumina was selected so that at a sintering temperature which is necessary during the sintering of the powder mixture to form a glaze filled with the alumina, the alumina alone has a sintering activity which leads to a relative sintered density of at least 95%.
- Such an alumina is present according to the following table with the alumina B and C. The table shows the actual sintering density pg in g / cm 3 and the relative sintering density Ps / Pth ⁇ n ⁇ ⁇ for three different clays A, B and C.
- Mg spinel, forsterite or a mixture of these substances can also be used as the crystalline, non-metallic material. It is also conceivable to add further crystalline materials such as Mg spinel, forsterite or a mixture of these substances to the powder mixture with the clays B or C. These crystalline however, non-metallic materials must have a sintering activity which leads to a relative sintering density of at least 95%.
- composition of the powder mixture is composition of the powder mixture:
- the powder mixture is in a ball mill with 90%
- AI2O3 grinding balls homogenized for two hours and ground. Then an aqueous slip is prepared with 500g raw material mixture of alumina and Ba-Al-silicate glass, 500ml distilled water and 25ml 10% aqueous polyvinyl alcohol solution. The slip is ground in a ball mill with 90% Al2O3 grinding balls with a grinding time of 1.5 hours.
- This example differs from the powder mixture in Example 1 in that instead of the 40th
- % Ba-Al silicate glass powder the following composition is selected:
- composition of the powder mixture differs from example 1 in that the following constituents are used instead of the Ba-Al-silicate glass powder: 40% by weight of a calcine from: 11% by weight of kaolin, 34% by weight of quartz (99% SiO 2 ) 55% by weight BaC0 3 (chemically pure)
- the components are ground in a ball mill with 90% Al 2 O 3 grinding balls for two hours and calcined as bulk in corundum capsules in an oxidizing atmosphere at 1000 ° C. for two hours and then ground again as mentioned.
- composition of the powder mixture differs from Example 1 and Example 3 as follows: 70% by weight of alumina and 30% by weight of calcine, insulation resistance> 1 M ⁇
- composition corresponds to Example 7, with the alumina containing the following components: 99.3% A1 2 0 3 , 0.3% Na 2 0, specific surface area 2.5 m 2 / g, insulation resistance> 300 k ⁇
- composition corresponds to Example 3, but instead of the alumina with the following components: 60% by weight of Mg spinel powder (MgO * Al 2 0 3 ) with ⁇ 0.5% by weight of free MgO and ⁇ 0.1% by weight Na2 ⁇ , specific surface 8 m 2 / g, insulation resistance> 1 M ⁇
- the prepared paste is first applied to the unsintered ceramic carrier film 41 by means of screen printing.
- the resistance heater 44 is then also screen-printed by means of a cermet paste known per se.
- the plated-through holes 48 which were previously recessed in the insulation layer 42 and introduced into the carrier film 41, are carried out.
- the inner insulation layer 50 is now also applied using screen printing technology.
- the layer thicknesses of the insulation layers 42, 50 which have to be present after sintering are set by a corresponding number of screen printing steps and / or by a suitable choice of screen printing parameters and paste properties (viscosity etc.).
- the outer insulation layer 42 has a layer thickness of 18 ⁇ m and the inner insulation layer 50 also has a layer thickness of 18 ⁇ m.
- the heating element 41 thus produced is now laminated together with the measuring cell 12, which is produced in a similar manner by means of printing technology, and then co-sintered in a sintering process at approximately 1400 ° C.
- Sintering temperature sinter the ceramic and metallic components of the layer system.
- the insulation paste is formed by melting the glass-forming material and sintering the crystalline components to form the gas-tight electrical insulation layers 42 and 50.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19700700 | 1997-01-13 | ||
DE19700700A DE19700700C2 (de) | 1997-01-13 | 1997-01-13 | Sensorelement und Verfahren zu dessen Herstellung |
PCT/DE1997/002792 WO1998030894A1 (de) | 1997-01-13 | 1997-11-29 | Sensorelement und verfahren zu dessen herstellung |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0895593A1 true EP0895593A1 (de) | 1999-02-10 |
Family
ID=7817147
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97949979A Withdrawn EP0895593A1 (de) | 1997-01-13 | 1997-11-29 | Sensorelement und verfahren zu dessen herstellung |
Country Status (6)
Country | Link |
---|---|
US (1) | US6350357B1 (de) |
EP (1) | EP0895593A1 (de) |
JP (1) | JP4080002B2 (de) |
KR (1) | KR100464466B1 (de) |
DE (1) | DE19700700C2 (de) |
WO (1) | WO1998030894A1 (de) |
Families Citing this family (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19833087A1 (de) | 1998-07-23 | 2000-01-27 | Bosch Gmbh Robert | Gassensor und Verfahren zu dessen Herstellung |
DE19834276A1 (de) * | 1998-07-30 | 2000-02-10 | Bosch Gmbh Robert | Abgassonde |
DE19910444C2 (de) * | 1999-03-10 | 2001-01-25 | Bosch Gmbh Robert | Temperaturfühler |
DE19946343B4 (de) * | 1999-09-28 | 2007-03-29 | Robert Bosch Gmbh | Verfahren zur Herstellung eines planaren Sensorelements |
DE10004959C1 (de) * | 2000-02-04 | 2001-10-04 | Bosch Gmbh Robert | Elektrochemischer Meßfühler und Verfahren zu dessen Herstellung |
JP4421756B2 (ja) * | 2000-09-29 | 2010-02-24 | 日本特殊陶業株式会社 | 積層型ガスセンサ素子の製造方法 |
JP4721593B2 (ja) * | 2001-09-27 | 2011-07-13 | 京セラ株式会社 | 酸素センサ |
US6984298B2 (en) * | 2002-01-09 | 2006-01-10 | Delphi Technologies, Inc. | Gas sensor having an insulating layer |
DE10212018A1 (de) * | 2002-03-19 | 2003-10-02 | Bosch Gmbh Robert | Isolationsmaterial und Gassensor |
DE10222791B4 (de) * | 2002-05-23 | 2004-07-01 | Robert Bosch Gmbh | Heizeinrichtung |
JP4313027B2 (ja) * | 2002-11-12 | 2009-08-12 | 日本碍子株式会社 | ガスセンサ |
US7211180B2 (en) * | 2003-02-10 | 2007-05-01 | Robert Bosch Corporation | Contamination-resistant gas sensor element |
US8906214B2 (en) * | 2003-02-10 | 2014-12-09 | Robert Bosch Gmbh | Contamination-resistant gas sensor element |
US20090101502A1 (en) * | 2003-02-10 | 2009-04-23 | Robert Bosch Gmbh | Thermal Shock Resistant Gas Sensor Element |
DE10337573B4 (de) * | 2003-08-14 | 2006-02-09 | Robert Bosch Gmbh | Sensorelement |
JP2006222068A (ja) * | 2005-01-14 | 2006-08-24 | Denso Corp | セラミックヒータ及びその製造方法 |
US9297791B2 (en) | 2012-12-20 | 2016-03-29 | Robert Bosch Gmbh | Gas sensor with thermal shock protection |
DE102013211796A1 (de) | 2013-06-21 | 2014-12-24 | Robert Bosch Gmbh | Sensorelement mit Leiterbahn und Durchführung |
KR101603310B1 (ko) * | 2014-03-25 | 2016-03-14 | 주식회사 코멧네트워크 | 절연특성이 향상된 녹스 센서 소자의 제조방법 |
KR101603312B1 (ko) * | 2015-09-30 | 2016-03-14 | 주식회사 코멧네트워크 | 절연특성이 향상된 녹스 센서 소자 |
DE102015222108A1 (de) * | 2015-11-10 | 2017-05-11 | Robert Bosch Gmbh | Sensorelement und Verfahren zur Herstellung eines Sensorelements |
JP7366868B2 (ja) | 2020-09-09 | 2023-10-23 | 日立建機株式会社 | 電気駆動車両用グリッドボックス |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2907032C2 (de) * | 1979-02-23 | 1984-06-20 | Robert Bosch Gmbh, 7000 Stuttgart | Polarographischer Sauerstoffmeßfühler für Gase, insbesondere für Abgase von Verbrennungsmotoren |
DE2928496A1 (de) * | 1979-07-14 | 1981-01-29 | Bosch Gmbh Robert | Elektrochemischer messfuehler fuer die bestimmung des sauerstoffgehaltes in gasen |
JPH03158751A (ja) * | 1989-11-16 | 1991-07-08 | Matsushita Electric Ind Co Ltd | ガスセンサ素子 |
JP2989961B2 (ja) * | 1991-05-27 | 1999-12-13 | 株式会社デンソー | 吸気管内用酸素濃度検出器 |
JP3324195B2 (ja) * | 1993-04-13 | 2002-09-17 | 株式会社デンソー | 酸素センサの製造方法 |
DE4342731B4 (de) * | 1993-07-27 | 2004-09-09 | Robert Bosch Gmbh | Elektrochemischer Meßfühler mit einem potentialfrei angeordneten Sensorelement und Verfahren zu seiner Herstellung |
CN1055544C (zh) | 1993-07-27 | 2000-08-16 | 罗伯特·博施有限公司 | 带有自由电位式探测元件的氧浓度传感器及其制造方法 |
DE4415980A1 (de) * | 1994-05-06 | 1995-11-09 | Bosch Gmbh Robert | Vorrichtung zur Temperaturmessung an einer Sauerstoffsonde |
-
1997
- 1997-01-13 DE DE19700700A patent/DE19700700C2/de not_active Expired - Lifetime
- 1997-11-29 US US09/142,599 patent/US6350357B1/en not_active Expired - Lifetime
- 1997-11-29 JP JP53044198A patent/JP4080002B2/ja not_active Expired - Fee Related
- 1997-11-29 KR KR10-1998-0707099A patent/KR100464466B1/ko not_active IP Right Cessation
- 1997-11-29 WO PCT/DE1997/002792 patent/WO1998030894A1/de active IP Right Grant
- 1997-11-29 EP EP97949979A patent/EP0895593A1/de not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO9830894A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE19700700A1 (de) | 1998-07-16 |
WO1998030894A1 (de) | 1998-07-16 |
KR20000064570A (ko) | 2000-11-06 |
JP2000507359A (ja) | 2000-06-13 |
JP4080002B2 (ja) | 2008-04-23 |
DE19700700C2 (de) | 2000-01-20 |
KR100464466B1 (ko) | 2005-05-09 |
US6350357B1 (en) | 2002-02-26 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB IT |
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17P | Request for examination filed |
Effective date: 19990118 |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: HEUSSNER, KARL-HEINZ Inventor name: NEUMANN, HARALD Inventor name: WIEDENMANN, HANS-MARTIN |
|
17Q | First examination report despatched |
Effective date: 20060804 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20080603 |