WO1998045695A1 - Verfahren zur herstellung eines sensorelementes - Google Patents
Verfahren zur herstellung eines sensorelementes Download PDFInfo
- Publication number
- WO1998045695A1 WO1998045695A1 PCT/DE1998/000525 DE9800525W WO9845695A1 WO 1998045695 A1 WO1998045695 A1 WO 1998045695A1 DE 9800525 W DE9800525 W DE 9800525W WO 9845695 A1 WO9845695 A1 WO 9845695A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensor element
- edges
- broken
- composite
- foils
- Prior art date
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
- G01N27/4077—Means for protecting the electrolyte or the electrodes
Definitions
- the invention relates to a method for producing a sensor element, in particular for determining the oxygen content in exhaust gases from internal combustion engines with the features mentioned in the preamble of claim 1.
- the sensor elements are designed, for example, as so-called planar sensor elements, which consist of a combination of individual layers arranged one above the other in the form of a film.
- the individual foils of this composite are arranged one above the other in a defined manner, so that different functional layers are created.
- the individual foils of the composite are placed on top of one another as so-called green foils, for example using a screen printing technique in paste form.
- the sensor elements usually have solid electrolyte foils, electrode foils, heat conductor foils, insulation foils and protective foils.
- Known sensor elements can also have substrate films with printed electrolyte layers, aluminum oxide substrate films with calf semiconductor sensors (TiO 2, SrTiO 3). Instead of superimposing the green foils can also be obtained by individual printing steps. The stacking of these different foils creates a laminate composite, from which the sensor element is obtained by sintering.
- the individual layers of the sensor element are exposed to a different temperature. Because of these sudden temperature changes, which occur with different intensities, the sensor elements experience a temperature shock which leads to the occurrence of mechanical stresses in the surface area, in particular at the edges of the sensor element.
- a temperature shock resistance of the sensor elements it is known, for example, from US Pat. No. 5,144,249 to break the edges of the sensor element, that is to say to provide them with a chamfer.
- the chamfer is attached by means of a grinding process after sintering and after separating the sensor elements.
- the disadvantage here is that the already finished sensor elements are subjected to mechanical processing, which is relatively complex and can lead to undesired damage to the sensor elements.
- the method according to the invention with the features mentioned in claim 1 has the advantage that breaking the edges of the sensor element in one can be done without the risk of impairment of the sensor element. Because the edges of the sensor element are broken before sintering, it is possible to break the edges in any geometry by means of simple, non-cutting processes. In particular, the edges can be broken in a shape deviating from a flat surface, for example in a convex or concave shape, so that mechanical stresses occurring as a result of a temperature shock at the broken edges cannot lead to the formation of cracks.
- the edges are broken by reshaping, preferably by embossing the film composite present in the green state.
- the edges of the composite of the green foils can be reshaped in a simple manner by means of a simple embossing tool due to their soft consistency before sintering.
- embossing tool By forming an appropriate embossing tool, the edges can be broken in any shape. It is particularly advantageous if embossing foils are inserted into the embossing tools that are already in use, which only allow the edge region of the sensor element to be reshaped and leave the other regions, in particular the surface regions of the sensor element, unchanged.
- the embossing foil can very advantageously be coated with an adhesive coating, especially Teflon.
- edges are broken by means of a laser treatment.
- a contactless breaking of the edges of the sensor element in the green state can take place very advantageously, so that any mechanical loads on the composite of the green foils can be excluded.
- the contour of the broken edges of the sensor element can be set very advantageously by masking an eximer laser that is preferably used.
- the edges can preferably be broken before the green foils present in the composite are separated, so that the edges can be broken very effectively.
- the interfaces of the wafer having the individual sensor elements can be defined in this way.
- the laser treatment simultaneously breaks the edges and separates the composite of the green foils.
- edge breaking and separation can be carried out in one operation.
- Figure 1 is a sectional view through a sensor element
- FIG. 2 shows a sectional illustration through the use of a plurality of sensor elements
- FIG. 3 geometry structures of lasers
- Figure 4 shows the use of a laser according to the invention
- FIG. 1 shows a sectional illustration through a sensor element 10, which can be used, for example, to determine an oxygen content in exhaust gases from internal combustion engines in motor vehicles or from combustion systems. Since the structure and function of such a sensor element 10 is generally known, only the structure which is important for the explanation of the invention will be described below.
- the sensor element essentially has an elongated, platelet-shaped structure which consists of individual layers of different functional layers.
- the sensor element 10 has an electrochemical measuring cell 12 and a heating element 14.
- the measuring cell 12 consists of a first solid electrolyte film 16 and a second solid electrolyte film 18 which has an integrated reference gas channel 20.
- a measuring electrode 22 is assigned to a surface of the electrolyte film 16 on the measuring gas side and a reference electrode 24 is assigned to a surface assigned to the reference gas channel 20.
- a porous cover layer 26 is arranged above the measuring electrode 22.
- the heating element 14 has heating conductors 32 embedded in insulation layers 28 and 30. A further cover layer 34 adjoins the insulation layer 30.
- the solid electrolyte foils 16 and 18 and the cover layer 34 consist, for example, of a stabilized zirconium oxide ZrO 2.
- the electrodes 22 and 24 and the heating conductor 32 consist, for example, of a platinum cermet.
- the insulation layers 28 and 30 consist, for example, of a mixture of aluminum oxide I2O3 and glass-forming components.
- the entire composite of the individual layers has an approximately cuboid structure, at least the edges 36 running in the longitudinal direction of the sensor element having a chamfer 38.
- the sensor element 10 is produced by successively laminating the individual layers on the cover layer 34, which simultaneously forms a carrier.
- the layers can be defined by screen printing a paste material that has the respective composition of the layer. After completing this lamination, a so-called green film of the individual layers is formed, which has a relatively soft consistency.
- the composite is then subjected to sintering, the sensor element 10 being formed under the action of temperatures and possibly pressure.
- the chamfers 38 of the edges 36 are now structured before the sintering. Individual possibilities for achieving the bevels 38 are discussed below.
- FIG. 2 shows a detail of a so-called use of a large number of sensor elements 10 present in the green state.
- the individual layers of the sensor elements 10 are laminated simultaneously for a large number of sensor elements 10 and then the composite of the green foils for a sensor element 10 is separated.
- a section of three sensor elements 10 are shown in FIG.
- the same parts as in FIG. 1 are provided with the same reference numerals and are not explained again, and a detailed illustration has been omitted here for reasons of clarity.
- cut edges 40 are defined, on which a individualization of the sensor elements 10 takes place. Before the separation of the sensor elements 10, a defined surface depression 42 can be introduced at the cut edges 40.
- This surface recess 42 can take place, for example, by means of an eximer laser 44, which has a certain masking.
- an eximer laser 44 which has a certain masking.
- the eximer laser 44 can have a triangular mask, so that the surface depressions 42 become triangular in accordance with this depression.
- the masking can also have concave boundary surfaces.
- other exemplary embodiments are conceivable which have mixed forms of planes running at different angles and / or concave and / or convex boundary surfaces.
- the eximer laser 44 is moved along the surface of the composite of the green foils.
- either the Eximer laser 44 can be movable and / or the green foils are moved past the Eximer laser 44.
- the surface recess 42 is structured in terms of its depth and its advance.
- the broken edges 36 with their bevels 38 result from the structuring of the surface depressions 42.
- the sensor elements 10 are then separated along the cut edges 40 then be subjected to the sintering process.
- the sensor element 10 shown in cross section in FIG. 1 is subsequently created.
- the structuring of the bevels 38 in the green state of the foils of the sensor element 10 and the contactless structuring with the Eximer laser 44 means that the sensor element 10 is not subjected to any mechanical stress, so that damage in the essential can be excluded.
- the sensor elements can be separated by a further treatment with an Eximer laser, which has a corresponding masking.
- an Eximer laser which has a corresponding masking.
- FIG. 1 A further possibility of structuring the chamfers 38 is indicated in FIG.
- a sensor element 10 is applied with an embossing device 45 after the composite of the green foils has been separated.
- the embossing device 45 has a contour 46 which allows the edges 36 to be shaped such that they subsequently have the chamfers 38.
- the chamfer 38 can also have a different contour, for example flat and / or convex and / or concave sections, by means of the embossing.
- the contour 46 of the embossing device 45 can either be produced by producing a corresponding embossing device 45 or by inserting an embossing foil 48 into the embossing device 45.
- the embossing film 48 is preferably provided with a non-stick coating, for example Teflon, titanium nitride. Since the green foils also have a relatively soft consistency even during this shaping, the bevels 38 can be embossed in a simple manner without the pre-assembled sensor element 10 being adversely affected.
- a non-stick coating for example Teflon, titanium nitride. Since the green foils also have a relatively soft consistency even during this shaping, the bevels 38 can be embossed in a simple manner without the pre-assembled sensor element 10 being adversely affected.
- FIG. 6 A further exemplary embodiment is shown in FIG. 6, in which the sensor elements 10 can be embossed in a composite.
- the embossing device 45 has an embossing contour 50 which has projections 52 corresponding to the depressions 42.
- the embossed contour 50 can again be provided with a non-stick coating.
- the exemplary embodiment shown in FIG. 6 allows a plurality of sensor elements 10 to be embossed in a multiple manner in a simple manner by means of an embossing step, with a subsequent separation along the cutting edges 40 taking place.
- the embossing device 45 can very advantageously have an upper stamp 54 and a lower stamp 56, so that the upper and lower sides of the sensor elements 10 are embossed at the same time with one method step. Due to the relatively soft consistency of the sensor elements 10 which have not yet been sintered, the surface depressions 42 can be embossed with little effort, so that damage to the structure of the sensor elements 10 can be excluded. It goes without saying that both the structuring of the chamfers 38 by means of the eximer laser 44 or the embossing device 45 takes place on both sides of the sensor element 10. For this purpose, either a double-acting device can be provided, or the composite of the green foils of the sensor elements 10 is turned.
- the bevels 38 which are desirable for increasing the temperature shock resistance of the sensor elements 10, can be designed in different contours.
- the required tool effort is relatively low, and this is essentially not subject to wear, so that a long service life can be expected.
- the additional use of consumables, for example when grinding the sintered sensor element 10 in the prior art, is completely eliminated.
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/194,773 US6805830B1 (en) | 1997-04-04 | 1998-02-21 | Method for producing a sensor element |
EP98914800A EP0906564A1 (de) | 1997-04-04 | 1998-02-21 | Verfahren zur herstellung eines sensorelementes |
JP10542219A JP2000511644A (ja) | 1997-04-04 | 1998-02-21 | センサエレメントを製造するための方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19713904.3 | 1997-04-04 | ||
DE19713904A DE19713904A1 (de) | 1997-04-04 | 1997-04-04 | Verfahren zur Herstellung eines Sensorelementes |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998045695A1 true WO1998045695A1 (de) | 1998-10-15 |
Family
ID=7825427
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1998/000525 WO1998045695A1 (de) | 1997-04-04 | 1998-02-21 | Verfahren zur herstellung eines sensorelementes |
Country Status (6)
Country | Link |
---|---|
US (1) | US6805830B1 (de) |
EP (1) | EP0906564A1 (de) |
JP (1) | JP2000511644A (de) |
KR (1) | KR20000016275A (de) |
DE (1) | DE19713904A1 (de) |
WO (1) | WO1998045695A1 (de) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19815174B4 (de) * | 1998-04-04 | 2008-09-25 | Robert Bosch Gmbh | Verfahren zur Herstellung eines plättchenförmigen keramischen Körpers sowie Vorrichtung zur Durchführung des Verfahrens |
DE19928165A1 (de) | 1999-06-19 | 2000-12-21 | Bosch Gmbh Robert | Planares Sensorelement für einen Gassensor |
DE19932545A1 (de) * | 1999-07-13 | 2001-01-18 | Bosch Gmbh Robert | Heizleiter, insbesondere für einen Meßfühler, und ein Verfahren zur Herstellung des Heizleiters |
JP2002228626A (ja) * | 2000-11-30 | 2002-08-14 | Denso Corp | ガスセンサ素子 |
JP4066835B2 (ja) * | 2003-02-18 | 2008-03-26 | 株式会社デンソー | 積層型ガスセンサ素子の製造方法 |
US8168053B2 (en) * | 2006-01-23 | 2012-05-01 | Denso Corporation | Gas sensing member used for gas sensor and method of manufacturing the member |
JP4887981B2 (ja) * | 2006-01-23 | 2012-02-29 | 株式会社デンソー | ガスセンサ素子の製造方法 |
DE102010028589A1 (de) * | 2010-05-05 | 2011-11-10 | Robert Bosch Gmbh | Verfahren zur Herstellung eines keramischen Sensorelements |
JP5706376B2 (ja) | 2011-09-27 | 2015-04-22 | 日本特殊陶業株式会社 | ガスセンサ |
DE102017207105A1 (de) | 2017-04-27 | 2018-10-31 | Robert Bosch Gmbh | Verfahren zur Herstellung von Sensorelementen |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4403207A (en) * | 1981-10-26 | 1983-09-06 | General Motors Corporation | Durable titania exhaust gas sensor |
US5144249A (en) * | 1990-03-22 | 1992-09-01 | Ngk Insulators, Ltd. | Oxygen sensor |
US5573650A (en) * | 1993-01-28 | 1996-11-12 | Nippondenso Co., Ltd. | Gas sensor |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5871313A (en) * | 1996-10-01 | 1999-02-16 | International Business Machines Corporation | Precise self-aligning chamfer method and apparatus |
-
1997
- 1997-04-04 DE DE19713904A patent/DE19713904A1/de not_active Withdrawn
-
1998
- 1998-02-21 EP EP98914800A patent/EP0906564A1/de not_active Withdrawn
- 1998-02-21 WO PCT/DE1998/000525 patent/WO1998045695A1/de not_active Application Discontinuation
- 1998-02-21 KR KR1019980709848A patent/KR20000016275A/ko not_active Application Discontinuation
- 1998-02-21 JP JP10542219A patent/JP2000511644A/ja not_active Withdrawn
- 1998-02-21 US US09/194,773 patent/US6805830B1/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4403207A (en) * | 1981-10-26 | 1983-09-06 | General Motors Corporation | Durable titania exhaust gas sensor |
US5144249A (en) * | 1990-03-22 | 1992-09-01 | Ngk Insulators, Ltd. | Oxygen sensor |
US5573650A (en) * | 1993-01-28 | 1996-11-12 | Nippondenso Co., Ltd. | Gas sensor |
Also Published As
Publication number | Publication date |
---|---|
KR20000016275A (ko) | 2000-03-25 |
US6805830B1 (en) | 2004-10-19 |
EP0906564A1 (de) | 1999-04-07 |
DE19713904A1 (de) | 1998-10-08 |
JP2000511644A (ja) | 2000-09-05 |
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