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WO2006134086A1 - Pate conductrice utilisee pour produire un trace conducteur electrique et procede de production du trace conducteur electrique au moyen de ladite pate conductrice - Google Patents

Pate conductrice utilisee pour produire un trace conducteur electrique et procede de production du trace conducteur electrique au moyen de ladite pate conductrice Download PDF

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Publication number
WO2006134086A1
WO2006134086A1 PCT/EP2006/063090 EP2006063090W WO2006134086A1 WO 2006134086 A1 WO2006134086 A1 WO 2006134086A1 EP 2006063090 W EP2006063090 W EP 2006063090W WO 2006134086 A1 WO2006134086 A1 WO 2006134086A1
Authority
WO
WIPO (PCT)
Prior art keywords
conductor
strip conductor
siloxane
conductive paste
producing
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/EP2006/063090
Other languages
German (de)
English (en)
Inventor
Steffen Walter
Niels Van Der Laag
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of WO2006134086A1 publication Critical patent/WO2006134086A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/09—Use of materials for the conductive, e.g. metallic pattern
    • H05K1/092—Dispersed materials, e.g. conductive pastes or inks
    • H05K1/095—Dispersed materials, e.g. conductive pastes or inks for polymer thick films, i.e. having a permanent organic polymeric binder
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/14—Conductive material dispersed in non-conductive inorganic material
    • H01B1/16—Conductive material dispersed in non-conductive inorganic material the conductive material comprising metals or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/20—Conductive material dispersed in non-conductive organic material
    • H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0266—Marks, test patterns or identification means
    • H05K1/0268—Marks, test patterns or identification means for electrical inspection or testing

Definitions

  • the invention relates to a conductor paste for producing an electrical conductor track, comprising a solid-state dispersion with powder particles of at least one electrically conductive solid.
  • a method for producing the electrical conductor using the conductor paste is specified.
  • a paste is a dispersion of liquid to doughy consistency.
  • the dispersion consists of at least two phases (components). In a continuous phase (dispersing agent) at least one further phase (dispersed phase, dispersant) is finely divided.
  • the dispersion is a solid state dispersion with a more or less liquid dispersant and a dispersant with powder particles of a solid.
  • a so-called dispersant is used.
  • the dispersant facilitates the dispersion of the
  • Powder particles in the dispersant for example, by lowering the interfacial tension between the two components of the solid state dispersion. This increases the wettability of the powder particles with the dispersing agent.
  • the dispersant acts as a physical binder between the two phases of the solid state dispersion.
  • the dispersant can also function as a chemical binder. In this case, the dispersion is achieved by forming chemical bonds between constituents of the two phases. It is also possible that the
  • Dispersion has multiple dispersants or binders.
  • the dispersion has a dispersant and / or binder system.
  • the component is, for example, a heat shield of a combustion chamber of a gas turbine.
  • a fossil fuel is burned in the combustion chamber of the gas turbine.
  • a temperature of up to 1500 ° C is reached. This gives rise to corrosive gases that can attack the combustion chamber.
  • the combustion chamber is lined with a variety of so-called ceramic heat shields.
  • a heat shield is a component made of a component material which has a very good temperature and corrosion resistance.
  • the component material is, for example, a ceramic material in the form of mullite. Due to a porous structure with a large number of microcracks, the ceramic material shows a very good thermal shock behavior. A very large temperature variation, which occurs for example when interrupting the combustion process in the combustion chamber of the gas turbine, is compensated, without the heat shield is destroyed. However, a mechanical overload of the heat shield can lead to a degradation of the heat shield. It can be a crack
  • Micro crack in the heat shield.
  • Such a crack forms in particular at the edge of the heat shield.
  • the crack may spread in the direction of the center of the heat shield.
  • the crack does not adversely affect the functionality of the heat shield up to a certain length and can therefore be tolerated. But if the crack exceeds a certain length, the functionality of the heat shield is no longer guaranteed.
  • Replacement of the heat shield is required to avoid breakage of the heat shield caused by the crack during operation of the gas turbine. This is where DE 102 23 985 A1 begins. It is shown how the formation of a crack can be detected and a length of an existing crack can be determined by means of a suitable control device.
  • An essential part of the control device is an electrical conductor track.
  • the trace is applied to the back of the heat shield, which faces away from an interior of the combustion chamber.
  • a crack occurring on the back of the heat shield leads to a crack of the conductor track.
  • the track is severed.
  • an electrical property of the conductor track changes. For example, the DC resistance and the impedance of the conductor increases.
  • the control device is designed so that the electrical property of the conductor can be queried. Will a change in the electrical
  • the conductor material (interconnect material) used for the conductor track of the control device must have certain properties.
  • the conductor material must be electrically conductive.
  • the conductor material must be brittle, so that a degradation of the heat shield also leads to a degradation of the conductor path. In addition, these properties may change only insignificantly under thermal stress.
  • the object of the present invention is therefore to specify a conductor paste which is suitable for producing an electrical conductor track.
  • the electrical and mechanical properties of the resulting conductor track should be adjustable within wide ranges.
  • a conductor paste for producing an electrical conductor track is specified, comprising a solid-state dispersion with powder particles of at least one electrically conductive solid.
  • the conductor paste is characterized in that the solid-state dispersion has at least one crosslinkable siloxane.
  • a method for producing a conductor track on a carrier body using the conductor paste is also specified with the following method steps: a) applying the conductor paste to a surface of the carrier body and b) generating the conductor track, with crosslinking of the siloxane being carried out.
  • the powder particles of the electrically conductive solid form the dispersant of the solid state suspension.
  • the siloxane acts as a dispersant and / or as a dispersant.
  • the siloxane acts as a chemical binder for the powder particles of the electrically conductive solid.
  • the solid dispersion may contain further constituents, for example further dispersants, further dispersants or further (chemical or physical) binders. These further constituents are, for example, terpinol or ethyl cellulose.
  • the siloxane is an organosilicon compound.
  • the siloxane may be present as a monomer and / or as an oligomer.
  • the siloxane is a polysiloxane
  • the siloxane is present as a polymer. It is also conceivable that the siloxane is monomeric, oligomeric and polymeric.
  • the siloxane has organic side chains, for example ethyl or phenyl groups. It has been found that a siloxane with methyl groups and in particular a polysiloxane with methyl groups as side chains are particularly good suitable is. In a particular embodiment, therefore, the polysiloxane is methylpolysiloxane. The side chains of this polysiloxane are formed by methyl groups.
  • the silicone is crosslinkable. This means that the siloxane is a (poly) condensation reaction and / or
  • the siloxane has one or more reactive functional groups which are available for a condensation reaction and / or polymerization reaction.
  • a reactive functional group is, for example, an OH group.
  • MTES methyltriethoxysilane
  • PTES phenyltriethoxysilane
  • TEOS tetraethoxysilane
  • the crosslinking of the siloxane is initiated in a known manner.
  • a crosslinking agent is added.
  • a temperature increase It is carried out during the crosslinking, a temperature treatment.
  • the conductor paste is dried after application to the carrier body at 200 ° C. By drying at this temperature, curing or crosslinking of the siloxane takes place.
  • inorganic constituents consisting of silicon-oxygen-silicon chains (Si-O-Si) and organic side chains (for example methyl, ethyl or phenyl groups) are present.
  • the solid state dispersion can have only one type of siloxane. This forms a condensation and / or polymerization, which is composed only of this one type of siloxane. In particular, it is also possible that various types of monomeric, oligomeric and / or polymeric siloxanes are present. Also, other organometallic or non-organometallic, condensable and / or polymerizable constituents may be present. By Crosslinking produces co-condensation and / or copolymerization products.
  • the electrical conductor By crosslinking the siloxane, the electrical conductor can be produced directly. It forms an electrical conductor with a composite material of crosslinked siloxane and the powder particles of the electrically conductive solid.
  • a solids content of the electrically conductive solid is selected according to the solid state dispersion.
  • a temperature treatment is carried out during and / or after the crosslinking of the siloxane.
  • the crosslinking of the siloxane can be influenced. This concerns, for example, a crosslinking rate and a degree of crosslinking.
  • the temperature treatment can also lead to a chemical reaction of the siloxane and / or the crosslinked siloxane.
  • a ceramizing or sintering of the crosslinked or crosslinking siloxane takes place during the temperature treatment. For example, in a first
  • Temperature treatment step at a lower temperature carried out the crosslinking of the siloxane.
  • the result is a solid precursor (precursor) of the conductor.
  • a second temperature treatment step (above 500 ° C) it comes to ceramization.
  • the crosslinked siloxane is converted into a ceramic material.
  • Reaction comes, in which the powder particles of the electrically conductive solid are involved.
  • a chemical reaction is, for example, a reaction of Solid of the powder particle with components of the crosslinked siloxane, an intermediate of the ceramic material, the resulting ceramic material or an atmosphere in the presence of which the reaction is carried out.
  • the electrically conductive solid in the form of the powder particles is essentially chemically inert. The electrical conductivity of the solid is maintained during the conversion of the siloxane into the ceramic material.
  • the conversion into the ceramic material can be carried out at a temperature above 600 ° C, for example at a temperature in the range of 600 ° C to 1500 ° C.
  • the temperature treatment is carried out at a temperature of less than 600 ° C and in particular at a temperature in the range of 500 ° C - 600 ° C.
  • the pyrolysis is carried out in the presence of argon (argon atmosphere).
  • silicon-oxygen-silicon chains are formed, which are connected to one another via carbon atoms (Si-O-Si-C-Si-O-Si chains).
  • Si-O-Si silicon-oxygen-silicon chains
  • Si-O-Si silicon-oxygen-silicon chains
  • the organic components are expelled in the presence of oxygen.
  • Pyrolysis or ceramization produces a conductor material in the form of a ceramic composite material.
  • the composite material has the ceramic material obtained by the pyrolysis of the siloxane and the powder particles of the electrically conductive solid.
  • the choice of siloxane, the conditions under which the crosslinking and the ceramization are carried out, the nature of the electrically conductive solid and the proportions of the substances involved in the conductor paste, can be used Properties of the conductor material of the resulting connection line can be adjusted in a wide range.
  • the electrically conductive solid is a ceramic material.
  • a brittle conductor material is obtained.
  • the solid has at least one metal.
  • cermet metal ceramics
  • the resulting particle composite consists of at least two phases. One of the phases is metallic, the other one is ceramic.
  • a conductor paste with a metal as an electrically conductive solid is the preferred starting point for adapting the properties of the conductor material to corresponding requirements for the electrical conductor. For example, by increasing a proportion of siloxane and the resulting higher proportion of silica brittleness of the conductor material can be increased. By increasing the proportion of the metal powder, however, the electrical conductivity of the conductor material can be increased. At the same time, the brittleness of the conductor material is lowered with the increased proportion of metal powder.
  • any metal is conceivable, for example, chromium, iron, copper, nickel or silver. Alloys are just as possible as mixtures of powder particles of different metals.
  • the choice of metal depends on different points of view.
  • the chemical reactivity of the metal plays a role.
  • copper is used when pyrolyzed under an argon atmosphere, that is, in the absence of oxygen. In the presence of oxygen, oxidation of the copper would occur.
  • the melting point of the metal A metal is chosen whose melting point is above the pyrolysis temperature of the conductor paste. The metal remains in the ceramizing Mass distributed homogeneously. It flows during the
  • silver is used as the metal. It is characterized by a relatively high oxidation resistance.
  • the metal is aluminum.
  • the powder particles are made of pure aluminum or an aluminum alloy. Pure aluminum is characterized by a relatively high electrical conductivity. By forming a passivation layer, pure aluminum is relatively inert even in the presence of oxygen.
  • the combination of powder particles of aluminum and of crosslinkable methylpolysiloxane has proved to be advantageous. Methyl polysiloxane acts as an efficient binder for aluminum powder particles.
  • the pyrolysis of the methylpolysiloxane can be carried out below 600 ° C. in the
  • the melting point of aluminum is about 660 ° C.
  • the powder particles of the conductor paste have a mean particle diameter dso selected from the range from 1.0 ⁇ m to 50.0 ⁇ m inclusive and in particular from the range from 10.0 ⁇ m to 30 ⁇ m inclusive.
  • dso mean particle diameter selected from the range from 1.0 ⁇ m to 50.0 ⁇ m inclusive and in particular from the range from 10.0 ⁇ m to 30 ⁇ m inclusive.
  • Such particle diameter lead to a homogeneous and easy to process conductor paste.
  • the electrical conductivity of the resulting conductor material is very easily adjustable with these particle diameters. Larger or smaller particle diameters are also conceivable.
  • the conductor paste can be used to produce any desired electrical conductor on any carrier body (component).
  • Conductor prepared a conductor track of a control device for detecting a degradation of the carrier body.
  • the heat shield of a combustion chamber of a gas turbine is used as the carrier body or component.
  • Powder particles from the electrically conductive solid achieves the necessary electrical conductivity of the conductor material.
  • the invention provides the following essential advantages:
  • an electrical conductor can be made of a conductor material with a variety of properties.
  • composition of the conductor paste can be matched to the carrier body. In addition to physical properties, this also concerns a chemical compatibility (non-reactivity) between the
  • a temperature treatment (sintering temperature) of less than 600 ° C undergoes the carrier body on which the conductor paste is applied, a relatively low thermal stress during the transfer of the conductor paste in the conductor track.
  • a viscosity of the paste can be adjusted for the desired processing.
  • a conductor paste for producing an electrical conductor 11 made of a brittle conductor material has a solid state dispersion.
  • the solid-state dispersion contains as essential components a crosslinkable methylpolysiloxane and powder particles of aluminum.
  • the average particle diameter dso of the aluminum powder particles is about 30 ⁇ m.
  • further constituents are present which act as dispersants and / or binders. These ingredients are terpinol and ethyl cellulose.
  • 10 g of the conductor paste are prepared as follows: In a (dry) beaker, 6.77 g of aluminum powder, 3.33 g of methylpolysiloxane (solid silicone resin) are mixed. To the resulting mixture terpinol is added dropwise with stirring. Terpinol acts as a dispersant. It is obtained a homogeneous mixture. Thereafter, a mixture of terpinol and ethylcellulose is added. With the help of this mixture, a desired for the subsequent processing of the conductor paste viscosity is set.
  • the conductor paste is used to produce an electrical conductor 11 on a carrier body 10.
  • the carrier body 10 is a component in the form of a ceramic heat shield of a combustion chamber of a gas turbine.
  • the conductor paste is applied in a structured manner in the form of the conductor track 11 to be produced on a surface 111 of the rear side of the heat shield.
  • the structured application takes place in an injection molding process. Alternatively, the structured application is carried out with the aid of a mask. After application becomes a first
  • Temperature treatment step performed at about 200 ° C. This leads to crosslinking or condensation of the methylpolysiloxane.
  • the first temperature treatment step takes about 90 minutes.
  • a second temperature treatment step is carried out at 600 ° C.
  • the second temperature treatment step is carried out in the presence of oxygen and takes about 30 minutes. This leads to the pyrolysis of the conductor paste. There is a kind of sintering. This forms the trace with the brittle conductor material.
  • the conductor material is a particle composite in which powdered aluminum is embedded in a ceramic network of silicon dioxide.
  • Temperature treatment step creates a solid and intimate contact between the conductor 11 and the heat shield 10 by sintering.
  • the brittle trace 11 made on the backside of the heat shield 10 is used as part of a control device for detecting a crack 102 of the heat shield 10. Due to the brittleness of the conductor track 11 and due to the firm contact between the component 10 and the conductor track 11, a crack 102 propagating in the heat shield 10 leads to a crack 112 in the conductor track 11. Due to the crack 112 in the conductor track 11, an electrical property changes the trace 11. The change in the electrical property of the trace is detected by means of the control device.
  • silver and a silver-palladium alloy is used instead of the aluminum.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Conductive Materials (AREA)

Abstract

L'invention concerne une pâte conductrice, utilisée pour produire un tracé conducteur électrique (11), comportant une dispersion de solides avec des particules pulvérulentes d'au moins un solide électroconducteur. La pâte conductrice se caractérise en ce que la dispersion de solides présente au moins un siloxane réticulable. L'invention concerne en outre un procédé permettant de produire un tracé conducteur sur un corps support (10) au moyen de la pâte conductrice, qui comprend les étapes suivantes: a) appliquer la pâte conductrice sur une surface (101) du corps support et b) produire le tracé conducteur, sous réticulation du siloxane. Le siloxane réticulable est notamment du méthylpolysiloxane. Le solide électroconducteur est de préférence de l'aluminium. Le tracé conducteur est obtenu par pyrolyse de la pâte conductrice. Il en résulte un matériau conducteur issu de la pâte conductrice, qui présente une matrice céramique à base de dioxyde de silicium, dans laquelle des particules d'aluminium sont incorporées. La pâte conductrice s'utilise de préférence pour produire un tracé conducteur de dispositif de contrôle pour détecter une détérioration d'un élément céramique et en particulier, celle d'un bouclier thermique de chambre de combustion de turbine à gaz. A cet effet, le tracé conducteur fragile et le bouclier thermique sont disposés adjacents l'un à l'autre, de sorte qu'une détérioration (102) du bouclier thermique entraîne une détérioration (112) du tracé conducteur. La détérioration du tracé conducteur induit une modification d'une propriété électrique du tracé conducteur, qui est détectée par l'intermédiaire du dispositif de contrôle.
PCT/EP2006/063090 2005-06-17 2006-06-12 Pate conductrice utilisee pour produire un trace conducteur electrique et procede de production du trace conducteur electrique au moyen de ladite pate conductrice Ceased WO2006134086A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200510028250 DE102005028250A1 (de) 2005-06-17 2005-06-17 Leiterpaste zum Herstellen einer elektrischen Leiterbahn und Herstellungsverfahren der elektrischen Leiterbahn unter Verwendung der Leiterpaste
DE102005028250.4 2005-06-17

Publications (1)

Publication Number Publication Date
WO2006134086A1 true WO2006134086A1 (fr) 2006-12-21

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PCT/EP2006/063090 Ceased WO2006134086A1 (fr) 2005-06-17 2006-06-12 Pate conductrice utilisee pour produire un trace conducteur electrique et procede de production du trace conducteur electrique au moyen de ladite pate conductrice

Country Status (2)

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DE (1) DE102005028250A1 (fr)
WO (1) WO2006134086A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120152343A1 (en) * 2010-12-16 2012-06-21 E. I. Du Pont De Nemours And Company Aluminum paste compositions comprising siloxanes and their use in manufacturing solar cells
US8778231B2 (en) 2010-12-16 2014-07-15 E I Du Pont De Nemours And Company Aluminum pastes comprising boron nitride and their use in manufacturing solar cells

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006043781A1 (de) 2006-09-13 2008-03-27 Siemens Ag Bauteil mit einer Erfassungsstruktur für mechanische Beschädigungen

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US4634623A (en) * 1983-07-18 1987-01-06 The Gates Corporation Conductive elastomeric ink composition
EP0300380A1 (fr) * 1987-07-22 1989-01-25 Wacker Silicones Corporation Compositions électroconductrices
EP0506272A1 (fr) * 1991-03-27 1992-09-30 Japan Synthetic Rubber Co., Ltd. Composition conductrice formant des élastomères
EP0647682A1 (fr) * 1993-10-06 1995-04-12 Dow Corning Toray Silicone Company, Limited Compositions organosiloxanes électroconductrices chargées d'argent
US5961888A (en) * 1994-10-19 1999-10-05 Robert Bosch Gmbh Ceramic electric resistor
DE10223985A1 (de) * 2002-05-29 2003-12-18 Siemens Ag Anordnung aus einem Bauteil und einer Kontrollvorrichtung, Verfahren zum Herstellen der Anordnung und Verwendung der Anordnung

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Publication number Priority date Publication date Assignee Title
DE19946712A1 (de) * 1999-09-29 2001-04-05 Inst Neue Mat Gemein Gmbh Verfahren und Zusammensetzungen zum Bedrucken von Substraten

Patent Citations (6)

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Publication number Priority date Publication date Assignee Title
US4634623A (en) * 1983-07-18 1987-01-06 The Gates Corporation Conductive elastomeric ink composition
EP0300380A1 (fr) * 1987-07-22 1989-01-25 Wacker Silicones Corporation Compositions électroconductrices
EP0506272A1 (fr) * 1991-03-27 1992-09-30 Japan Synthetic Rubber Co., Ltd. Composition conductrice formant des élastomères
EP0647682A1 (fr) * 1993-10-06 1995-04-12 Dow Corning Toray Silicone Company, Limited Compositions organosiloxanes électroconductrices chargées d'argent
US5961888A (en) * 1994-10-19 1999-10-05 Robert Bosch Gmbh Ceramic electric resistor
DE10223985A1 (de) * 2002-05-29 2003-12-18 Siemens Ag Anordnung aus einem Bauteil und einer Kontrollvorrichtung, Verfahren zum Herstellen der Anordnung und Verwendung der Anordnung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120152343A1 (en) * 2010-12-16 2012-06-21 E. I. Du Pont De Nemours And Company Aluminum paste compositions comprising siloxanes and their use in manufacturing solar cells
US8778231B2 (en) 2010-12-16 2014-07-15 E I Du Pont De Nemours And Company Aluminum pastes comprising boron nitride and their use in manufacturing solar cells

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