WO2008145660A2 - Procédé de fabrication d'une couche céramique étanche aux gaz, et couche céramique - Google Patents

Procédé de fabrication d'une couche céramique étanche aux gaz, et couche céramique Download PDF

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Publication number
WO2008145660A2
WO2008145660A2 PCT/EP2008/056513 EP2008056513W WO2008145660A2 WO 2008145660 A2 WO2008145660 A2 WO 2008145660A2 EP 2008056513 W EP2008056513 W EP 2008056513W WO 2008145660 A2 WO2008145660 A2 WO 2008145660A2
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WO
WIPO (PCT)
Prior art keywords
layer
sintering
sprayed
additives
thermal
Prior art date
Application number
PCT/EP2008/056513
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German (de)
English (en)
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WO2008145660A3 (fr
Inventor
Claudia Christenn
Kaspar Andreas Friedrich
Original Assignee
Deutsches Zentrum für Luft- und Raumfahrt e.V.
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Application filed by Deutsches Zentrum für Luft- und Raumfahrt e.V. filed Critical Deutsches Zentrum für Luft- und Raumfahrt e.V.
Publication of WO2008145660A2 publication Critical patent/WO2008145660A2/fr
Publication of WO2008145660A3 publication Critical patent/WO2008145660A3/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/12—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte
    • H01M8/124—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the process of manufacturing or by the material of the electrolyte
    • H01M8/1246—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the process of manufacturing or by the material of the electrolyte the electrolyte consisting of oxides
    • H01M8/1253—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the process of manufacturing or by the material of the electrolyte the electrolyte consisting of oxides the electrolyte containing zirconium oxide
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/18—After-treatment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/12—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte
    • H01M2008/1293—Fuel cells with solid oxide electrolytes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0065—Solid electrolytes
    • H01M2300/0068—Solid electrolytes inorganic
    • H01M2300/0071—Oxides
    • H01M2300/0074—Ion conductive at high temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0065—Solid electrolytes
    • H01M2300/0068—Solid electrolytes inorganic
    • H01M2300/0071—Oxides
    • H01M2300/0074—Ion conductive at high temperature
    • H01M2300/0077—Ion conductive at high temperature based on zirconium oxide
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/12—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte
    • H01M8/124—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the process of manufacturing or by the material of the electrolyte
    • H01M8/1246—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the process of manufacturing or by the material of the electrolyte the electrolyte consisting of oxides
    • H01M8/126—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the process of manufacturing or by the material of the electrolyte the electrolyte consisting of oxides the electrolyte containing cerium oxide
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/12—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte
    • H01M8/124—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the process of manufacturing or by the material of the electrolyte
    • H01M8/1246—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the process of manufacturing or by the material of the electrolyte the electrolyte consisting of oxides
    • H01M8/1266—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the process of manufacturing or by the material of the electrolyte the electrolyte consisting of oxides the electrolyte containing bismuth oxide
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the invention relates to a method for producing a gas-tight ceramic layer, in particular a solid electrolyte layer for a high-temperature Brennstoffzelie.
  • the invention further relates to a ceramic layer, in particular solid electro j yt slaughter a high-temperature fuel cell.
  • a process for producing a gas-tight solid electrolyte layer which comprises the steps of providing a non-sintered or pre-sintered at temperatures below 115o 0 C, on a substrate applied electrolyte layer up with a zirconium facing Fiuid is infiltrated and the infiltrated Eiektrolyt Anlagen is sintered at a temperature below 1400 0 C is sintered.
  • DE 102 12 966 B4 discloses a method for producing a high-temperature fuel cell with electrodes, intermediate layers of electrode material and electrolyte material, and ceramic electrolyte adjoining the intermediate layers, wherein the zirconium oxide is partly or fully stabilized with yttrium or scandium As base material that can be applied to the electrodes by means of wet-ceramic method and can be compacted by sintering, is used.
  • EP 0 588 632 B1 discloses a process for producing a solid oxide fuel cell with a solid electrolyte section as an ion conductor in a sandwich arrangement between an air electrode and a fuel electrode wherein the solid electrolyte portion is stabilized or partially stabilized zirconia containing one or more additional metal elements in the solid electrolyte portion.
  • the invention has for its object to provide a method of the type mentioned above, by means of which can be produced in a simple manner, a gas-tight ceramic layer in particular small thickness.
  • a layer material is applied by thermal spraying of material on a substrate, the layer is doped with one or more sintering additives, and the applied layer is densified by sintering.
  • thermal spraying sprayed material is brought into a thermal jet. Due to the short interaction time between the sprayed material and the thermal jet which can be achieved during thermal spraying (for example during flame spraying or plasma spraying), the thermal load of the injection molding material and the substrate is relatively low. Within a short time (on the order of a few minutes), the corresponding ceramic layer can be produced. In the thermal jet, the sprayed material is accelerated and melted. The substrate is superimposed on the substrate staring droplets and it comes to the formation of a closed layer.
  • a precoat is produced by thermal spraying, in which sintering additives are incorporated. This allows a resintering of the precoat to produce the final ceramic layer. The latter then has a high density due to the thermal densification.
  • the re-sintering process can be carried out at lower temperatures than a complete sintering process. Usually, it can also be carried out with a shorter period of time.
  • ceramic layers such as solid electrolyte layers with high gas-tightness can be produced within a relatively short time. It iassen in particular thin layers produce.
  • one or more shenteradditive be introduced as sprayed into the layer, that is, the or the sintering additives are also applied by thermal spraying. As a result, it is possible to achieve targeted doping of the precoat with sintering additives.
  • sprayed material is introduced into a thermal jet which impinges on the substrate.
  • the main material for the layer and / or sintering additives can be applied to the substrate.
  • the (thermal) jet such as a flame jet or plasma jet, the sprayed material is accelerated and melted. It has proved to be advantageous if metallic Ti, V, Mn, Fe, Co, Ni, Cu or a compound with one or more of these materials is used as sintering additives.
  • sintering additives Bi, Ga, Al, B or a bond with one or more of these materials is used.
  • the (pre-) layer produced has a doping with sintering additives in the range from greater than 0% by mole to 5% by mole and in particular in the range from greater than 0% by mole to 2% by mole. It can thereby achieve a thermal densification of the prepared pre-layer in a simple manner.
  • the sintering additives have no significant influence on the necessary properties of the ceramic layer, such as the electrical insulating property for electron conduction and the conductivity for oxygen ions.
  • the sintering is carried out in a temperature range from 65O 0 C to 1000 0 C and in particular in a temperature range of 75O 0 C to 950 0 C and in particular in a temperature range from 850 0 C to 950 0 C.
  • the solution according to the invention makes it possible to carry out sintering for thermal densification at relatively low temperatures in comparison with known processes in which the ceramic layer is produced by sintering without prior thermal spraying (the precoat being applied wet chemically in these known processes).
  • a metallic carrier substrate can also be used non-destructively in the sintering process. It is also possible that the sintering process alone by the Operation of the corresponding high-temperature fuel cell is performed when the ceramic layer is a solid electrolyte layer.
  • the sprayed material is applied by plasma spraying.
  • a plasma jet is generated as a thermal jet into which the sprayed material is coupled.
  • the plasma spraying can be carried out under atmospheric conditions or under vacuum conditions.
  • the doping with sintering additives can be carried out in various ways.
  • a mixture of one or more sintering additives and a main material for the layer is prepared and the mixture is thermally sprayed as a sprayed material, that is mixing material is introduced into the thermal jet.
  • the mixing ratio it is possible, for example, to achieve a defined homogeneous distribution of the sintering additive (s) in the precoat.
  • a main material for the layer and one or more sintering additives are sprayed separately. This can be done with one or more separate thermal jets. If a thermal jet is used, then, for example, sintering additive sprayed material and main material sprayed material can be coupled in succession ("batch coupling").
  • a main material for the layer and one or more sintering additives are injected alternately in time. It can thereby produce sub-layers in the pre-layer, which are rich in sintering additives.
  • the sprayed material is sprayed in powder form.
  • a suspension of one or more sintering additives and main material for the layer is thermally sprayed is, that is, the suspension is coupled into one or more thermal radiation.
  • a main material is! for the layer, gadolinium-doped cerium oxide or yttrium-stabilized or scandium-stabilized zirconium oxide. These materials have been found to be advantageous as materials for a solid electrolyte layer of a high-temperature oxide ceramic fuel cell.
  • the layer thickness is at most 100 ⁇ m.
  • the layer thickness is less than 40 microns.
  • it is in the range of 20 microns to 30 microns. It may also be smaller and, for example, in the range between 5 .mu.m and 10 .mu.m.
  • the layer is homogeneously doped with sintering additives at least in the area.
  • the layer is also doped homogeneously with sintering additives in a thickness direction. It can thereby achieve a uniform compression in the surface perpendicular to the thickness direction and optionally also in the thickness direction. This ensures a high gas-tightness, wherein the layer can be made correspondingly thin.
  • the layer produced according to the invention is an electrode contact layer.
  • it is produced on an electrode and a counterelectrode is applied to the layer.
  • the doping material may thereby come into contact with the electrode and / or counter electrode.
  • the sintering is carried out together with the sintering of at least one electrode which contacts the layer.
  • sintering of both the layer and the electrolyte layer as well as the at least one electrode can be carried out in one work step.
  • the sintering of an electrode is not necessary in all cases.
  • a ceramic layer is provided, such as a solid electrolyte layer of a high-temperature fuel cell, which is produced according to the method according to the invention. This ceramic layer has the advantages already explained above.
  • Figure 1 is a schematic partial sectional view of an embodiment of a high-temperature fuel cell
  • Figure 2 is a schematic representation of an apparatus for producing a gas-tight solid electrolyte layer
  • Figure 3 is a schematic representation of an embodiment of the method according to the invention.
  • Figure 4 is a schematic representation of another embodiment of the method according to the invention.
  • Figure 5 is a schematic representation of another embodiment of the method according to the invention.
  • a high-temperature fuel cell is an oxide-ceramic fuel cell (SOFC - solid oxide cell).
  • a high-temperature fuel cell module which is shown schematically in FIG. 1 in a partial sectional representation and designated therein by 10, comprises an electrochemical functional device 12 having an anode 14, a solid electrolyte 16 and a cathode 18.
  • the anode 14, the solid electrolyte 16 and the cathode 18 form an anode-electrolyte-cathode unit 20.
  • the anode 14 is arranged on an anode support 22.
  • the anode support 22 is electrically conductive (electron-conducting) and at least partially made of a porous material so that fuel gas can pass through the anode support 22 to the anode 14. It is usually made of a metallic material.
  • the anode support 22 is a mechanical support for the anode 14, via which an electrical contact of the anode 14, for example, with a housing (not shown in the figure) is made possible.
  • An electrical contact device 26 may be arranged on the anode support 22 on a side 24, which is opposite to the side on which the anode 14 is arranged. This is in particular made of a metallic material.
  • the electrical contact device 26 is in mechanical and electrical contact with a housing. It thereby ensures the electrical contacting of the anode 14 with the housing.
  • the electrical contact device 26 is soldered or welded to the anode support 22 and the housing, for example. About the electrical contact device 26, the anode support and thus the electrical functional device 12 is supported on the housing.
  • the electrical contact device 26 is gas-permeable, so that fuel gas can reach the anode 14.
  • the electrical contact device 26 is formed for example as a network or woven or knitted fabric.
  • the anode support may also be supported directly on the housing, which then has a corresponding gas distribution structure.
  • the anode is made of an oxide ceramic material and has an anodic catalyst;
  • the anode 14 is made of zirconium oxide with nickel as the catalyst.
  • the anode 14 is made as a layer, which for example has a thickness in the size range between 40 microns and 80 microns.
  • the solid electrolyte 16 is formed on the anode 14 and manufactured as a ceramic layer.
  • a typical layer thickness of the solid electrolyte is of the order of a few 10 ⁇ m. With increasing layer thickness, the electrical resistance increases and thus the electrical efficiency of the high-temperature fuel cell decreases.
  • the Festeiektroiyt 16 is gas-tight. It forms an insulator for electron conduction and is oxygen ion-conducting,
  • the solid electrolyte 16 is in anariessbeispie! made of yttrium-stabilized zirconium oxide. In another embodiment, it is made of gadolinium-stabilized ceria. For example, it may also be made of scandium-stabilized zirconia.
  • the cathode 18 is arranged on the solid electrolyte 16. It is made for example of an oxide ceramic material. For example, mixed oxides such as lanthanum-strontium manganate are used for the production.
  • the cathode 18 is designed in particular as a layer which has, for example, a layer thickness in the order of magnitude between 40 ⁇ m and 80 ⁇ m.
  • cathode is produced on a cathode support and then the solid electrolyte is produced on the cathode and subsequently the anode is produced.
  • the corresponding high-temperature fuel cell 10 is operated at a temperature in the range of about 65O 0 C to 1000 0 C.
  • the fuel which is or contains hydrogen gas, may be supplied via a reformer, for example.
  • the ceramic layer 16 is produced as follows:
  • the ceramic layer 16 is produced as a pre-layer, which is doped with one or more sintering additives. This pre-layer is sintered and thereby thermally densified.
  • the main material for the layer is brought on by thermal spraying ⁇ .
  • sprayed material 28 is introduced into a thermal jet 30 during thermal spraying.
  • a temperature prevails which is above the melting temperature of the injection molding material.
  • the sprayed material is accelerated and melted. It encounters a substrate 32.
  • thermal spray processes are flame spraying and plasma spraying.
  • the thermal beam 30 is generated by a plasma torch 34.
  • the spraying process is carried out under reduced pressure with respect to the atmosphere. Accordingly, the injection process is carried out in a space 36 which is closed gas-tight relative to the environment. It is basically also possible to perform a PJasmaspritzvorgang atmospheric.
  • a mixture of one or more sintering additives and a main material for the ceramic layer 16 to be produced is produced.
  • This mixture is introduced, for example via a powder conveyor 38 in the thermal beam 30.
  • main material for the layer is introduced into the thermal jet 30 and separately one or more sintering additives are introduced into the thermal jet 30.
  • a first powder feeder 40 for the main material and a second powder feeder 42 for the sintering additive or additives are provided for this purpose. There is then, as it were, a mixture in the thermal jet 30 and / or on the substrate 32.
  • the main material for the layer is sprayed on by a first thermal jet 44 and the sintering additive (s) are sprayed on via a second thermal jet 46.
  • a first plasma torch 48 is provided which generates the first thermal beam 44
  • a second plasma torch 50 is provided, which transmits the second thermal beam! 46 generated.
  • the main material for the pre-coat and one or more sintering additives are applied in a staggered sequence.
  • the coupling of main material into the thermal beam 30 and the coupling of one or more sintering additives into the thermal beam 30 in the time sequence are controlled via a corresponding control device 52.
  • It can be for example, build main material sublayers, between which sintering additive layers are arranged, which consist of sintering additives or have a high sintering additive content.
  • the main material and the sintering additive (s) prefferably be sprayed in powder form, that is, to be introduced into the thermal jet 30 in powder form.
  • the result of the described application methods is a precoat which is doped with sintering additives.
  • sintering additives it is possible to use metallic materials such as Ti, V, Mn, Fe, Co, Ni or Cu in elemental form or in compound forms, in particular in oxidic compound form. It is also possible that Bi, Ga, Al, B is used in elemental form or in compound form (in particular in oxide form). Combinations of the possible sintering additives described are also possible.
  • a preliminary layer is produced in which the proportion of sintering additives based on Ti, V, Mn, Fe, Co, Ni, Cu, Bi, Ga, Al, B (regardless of whether these are in elemental form or in compound form greater than 0 mol% to 5 mol% and in particular greater than 0 mol% to 2 mo)%.
  • This sintering may be performed in an oven or may be performed by the operation of the high-temperature fuel cell 10.
  • the sintering for thermal densification of the precoat and thus for the production of the ceramic layer 16 (in particular solid electrolyte layer) can be carried out at relatively low temperatures.
  • the preliminary layer with the doped sintering additives is first carried out by thermal spraying.
  • This ceramic layer can be densified thermally by sintering, whereby this resintering is feasible at the relatively low temperatures mentioned.
  • this sintering can be performed at a temperature that is not detrimental to a metallic anode support 22.
  • the sintering of the pre-layer is a thermal resintering, for example in an oven. It can also be carried out, at least in part, as "in-s ⁇ tu-Versinte- tion" by the operation of the high-temperature fuel cell 10.
  • the sintering time is less than 10 hours. Usually, with sufficiently thin layers, a sintering time of 1 to 3 hours is sufficient.
  • the solution according to the invention it is possible to produce ceramic layers such as solid electrolyte layers 16 with high density.
  • the sintering can be achieved at lower than usual temperatures (if no application of the main material via thermal spraying is provided). It can be made thin layers, which is a thickness for example, on the order of tens of microns, such as 20 microns to 40 microns,
  • the inventive method is particularly suitable for the production of solid electrolyte layers of a high-temperature oxide ceramic fuel cell (SOFC).
  • SOFC high-temperature oxide ceramic fuel cell
  • perturbations such as pores and micro-cracks can occur, which permit hydrogen diffusion between the anode and the cathode.
  • OCV open cell voltage
  • a high open cell voltage in turn means a high electrical efficiency of the high-temperature fuel cell.
  • sintering with relatively low temperatures is possible by doping the precoat with sintering additives. This makes it possible to achieve thermal densification of the solid electrolyte layer in order to reduce its gas permeability and, in particular during operation of a high-temperature fuel cell, sufficient hydrogen diffusion between the anode and cathode to suppress,
  • ceramic layers according to the invention as solid electrolyte layers, it is basically also possible to produce corresponding ceramic layers as electrode layers.
  • the use in sensors or as insulation material is possible.
  • the sintering additives are preferably introduced homogeneously into the layer, wherein the homogeneity in the surface is perpendicular to a thickness direction and preferably also in the thickness direction.
  • a high gas-tightness can be achieved both over the surface and over the thickness of the layer, whereby the layer can be formed with a small thickness.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Plasma & Fusion (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Fuel Cell (AREA)
  • Coating By Spraying Or Casting (AREA)

Abstract

L'invention concerne un procédé de fabrication d'une couche céramique étanche aux gaz et notamment d'une couche d'électrolyte solide, destinée à une pile à combustible à haute température, selon lequel on applique un matériau de couche sur un substrat en effectuant une pulvérisation thermique de produit à pulvériser, on dote la couche d'un ou de plusieurs auxiliaires de frittage et l'on complète l'étanchéité de la couche ainsi appliquée en effectuant un frittage intégral.
PCT/EP2008/056513 2007-05-31 2008-05-27 Procédé de fabrication d'une couche céramique étanche aux gaz, et couche céramique WO2008145660A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007026232A DE102007026232A1 (de) 2007-05-31 2007-05-31 Verfahren zur Herstellung einer gasdichten keramischen Schicht und keramische Schicht
DE102007026232.0 2007-05-31

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Publication Number Publication Date
WO2008145660A2 true WO2008145660A2 (fr) 2008-12-04
WO2008145660A3 WO2008145660A3 (fr) 2009-03-12

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WO (1) WO2008145660A2 (fr)

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US4614628A (en) * 1982-05-26 1986-09-30 Massachusetts Institute Of Technology Solid electrolyte structure and method for forming
DE4129553A1 (de) * 1990-09-10 1992-03-12 Fuji Electric Co Ltd Brennstoffzelle und verfahren zu ihrer herstellung
EP1253213A2 (fr) * 2001-04-23 2002-10-30 Sulzer Markets and Technology AG Procédé de fabrication d'une couche céramique ayant des fonctions électriques ou électrochimiques
DE10212966A1 (de) * 2002-03-22 2003-10-23 Siemens Ag Elektrolyt für eine keramische Hochtemperatur-Brennstoffzelle und Verfahren zu dessen Herstellung

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Publication number Priority date Publication date Assignee Title
US5527633A (en) * 1992-09-17 1996-06-18 Ngk Insulators, Ltd. Solid oxide fuel cells, a process for producing solid electrolyte films and a process for producing solid oxide fuel cells
DE102004054982A1 (de) 2004-11-13 2006-05-24 Forschungszentrum Jülich GmbH Gasdichte Elektrolytschicht sowie Verfahren zur Herstellung

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