EP1893550A1 - Film de graphite dote d'un revetement metallique - Google Patents

Film de graphite dote d'un revetement metallique

Info

Publication number
EP1893550A1
EP1893550A1 EP06753638A EP06753638A EP1893550A1 EP 1893550 A1 EP1893550 A1 EP 1893550A1 EP 06753638 A EP06753638 A EP 06753638A EP 06753638 A EP06753638 A EP 06753638A EP 1893550 A1 EP1893550 A1 EP 1893550A1
Authority
EP
European Patent Office
Prior art keywords
metal
graphite foil
coated
graphite
coating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06753638A
Other languages
German (de)
English (en)
Inventor
Oswin ÖTTINGER
Martin Christ
Ludger Fischer
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.)
SGL Carbon SE
Original Assignee
SGL Carbon SE
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 SGL Carbon SE filed Critical SGL Carbon SE
Priority to EP06753638A priority Critical patent/EP1893550A1/fr
Publication of EP1893550A1 publication Critical patent/EP1893550A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/56—Apparatus specially adapted for continuous coating; Arrangements for maintaining the vacuum, e.g. vacuum locks
    • C23C14/562—Apparatus specially adapted for continuous coating; Arrangements for maintaining the vacuum, e.g. vacuum locks for coating elongated substrates
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/20—Graphite
    • C01B32/21—After-treatment
    • C01B32/22—Intercalation
    • C01B32/225—Expansion; Exfoliation
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
    • C04B35/522—Graphite
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
    • C04B35/536—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite based on expanded graphite or complexed graphite
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/4505—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements characterised by the method of application
    • C04B41/4529—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements characterised by the method of application applied from the gas phase
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
    • C04B41/51—Metallising, e.g. infiltration of sintered ceramic preforms with molten metal
    • C04B41/515—Other specific metals
    • C04B41/5155—Aluminium
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
    • C04B41/81—Coating or impregnation
    • C04B41/85—Coating or impregnation with inorganic materials
    • C04B41/88—Metals
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/14—Metallic material, boron or silicon
    • C23C14/18—Metallic material, boron or silicon on other inorganic substrates
    • 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
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0204—Non-porous and characterised by the material
    • H01M8/0206—Metals or alloys
    • 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
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0204—Non-porous and characterised by the material
    • H01M8/0213—Gas-impermeable carbon-containing materials
    • 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
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0204—Non-porous and characterised by the material
    • H01M8/0223—Composites
    • H01M8/0228—Composites in the form of layered or coated products
    • 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
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0267—Collectors; Separators, e.g. bipolar separators; Interconnectors having heating or cooling means, e.g. heaters or coolant flow channels
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00844—Uses not provided for elsewhere in C04B2111/00 for electronic applications
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00853—Uses not provided for elsewhere in C04B2111/00 in electrochemical cells or batteries, e.g. 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
    • 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
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
    • Y10T428/264—Up to 3 mils
    • Y10T428/265—1 mil or less

Definitions

  • the present invention relates to graphite foils having a metal coating of at most 100 nm thickness and their preparation and use.
  • Graphite foil is produced by compacting and compressing graphite expandate.
  • Graphite expandate is formed when graphite intercalation compounds or graphite salts, e.g. Graphite hydrogen sulfate or graphite nitrate, are shocked heated.
  • the volume of the graphite particles increases by a factor of 200 to 400, and the bulk density drops to 2 to 20 g / l.
  • the resulting graphite expandate consists of worm or accordion-shaped, bulky aggregates. If these particles are compacted under pressure, they interlock and interlock with each other. Due to this effect, self-supporting flat structures, e.g. Foils or plates.
  • Graphite foil is characterized by high electrical and thermal conductivity in the plane, i. perpendicular to the pressing direction, and easy adaptation to adjacent surfaces.
  • graphite foil on at least one surface completely or partially with a coating of metal.
  • This coating can perform various functions such as mechanical reinforcement, increase the thermal and electrical conductivity and corrosion protection.
  • a metallic surface is needed in particular if the graphite foil components are to be connected by solder joints or welded joints to other, in particular metallic, components or to other expanded graphite components.
  • the patent US 5 100 737 discloses flexible laminations of at least one layer of graphite foil with a metal layer, for example of copper or nickel, on at least one of its surfaces.
  • the thickness of the graphite foil is 0.1 to 10 mm, that of the metal layer 1 to 200 ⁇ m, preferably between 3 and 50 ⁇ m.
  • the laminates are used in electrical shields, seals or heat sinks.
  • additional bond layers are provided on the graphite and / or metal layers to interconnect a plurality of such layer composites.
  • the bonding layer can be formed as a thin metal layer (thickness 1 to 5 ⁇ m) or as an adhesive layer.
  • the production of the metal layers is preferably carried out by chemical (ie, currentless means of a reducing agent) or electrodeposition.
  • metal-coated graphite sheets are also known. Stacking arrangements of such metal-coated graphite sheets are used as abrasive bodies in contact brushes of electrical machines.
  • the application of the layer can be carried out by the known thin-film methods, such as electroplating, electroless electroless plating, plasma or ion plating, sputtering or vapor deposition.
  • the vapor deposition technique is preferred, since here a particularly good adhesion of the metal to the graphite foil is achieved.
  • the thickness of the applied layers is between 0.1 and 500 .mu.m, preferably between 1 and 50 .mu.m.
  • the present invention relates to graphite foil having an at least one-sided, metal coating, wherein the metal layer has a thickness of at most 100 nm.
  • the invention also relates to flat, strip-like o.a. Semi-finished graphite foil, wherein at least one of the flat sides and at least one of the edges of the semifinished product has a metallic coating with a thickness of at most 100 nm.
  • the coated graphite films according to the invention have several advantageous properties.
  • the thin metal coating provides excellent protection of the surface of the graphite foil and possibly also the edges of a graphite foil semifinished product against breaking, peeling or flaking off of graphite particles.
  • Another object of the invention is to provide a method for producing metal coatings on graphite foil whose thickness does not exceed 100 nm.
  • the invention further relates to combinations of such coated graphite films and their
  • FIG. 1 shows by way of example a component in which semi-finished products of graphite foil coated according to the invention are brazed together.
  • FIG. 2 shows a heat sink whose fins consist of graphite foils coated in accordance with the invention in the fastening area.
  • the metal or metals coated on the graphite foil are selected according to the intended application. May be mentioned by way of example
  • Coatings of aluminum or copper which allow the production of solder joints to other components made of metal or metal-coated materials, as well as coatings of nickel, silver, gold or platinum metals.
  • the coating can be several
  • extended surfaces for example webs
  • graphite foil If extended surfaces, for example webs, are to be coated from graphite foil, then, for example, by means of continuous vapor deposition with the desired metal.
  • a plastic film e.g. a film of PET
  • the graphite foil is now vapor-coated on one side with metal.
  • the plastic film is mechanically removed again after vapor deposition from the uncoated surface of the graphite foil.
  • the invention is not bound to this process, suitable for the production of the coated graphite foil according to the invention are also other methods from the group of "PVD” (physical vapor deposition) methods such as sputtering and ion beam methods Manufacturing processes consist in the galvanic or electroless deposition of the metal layer.
  • PVD physical vapor deposition
  • This approach has the advantage that in addition to the flat sides, the edges of the film pieces can be coated.
  • the edges of the film pieces can be coated.
  • the positioning or orientation of the evaporation source must be varied accordingly.
  • certain areas of the surface of the graphite foil may be masked so that they remain uncoated.
  • certain structures patterns
  • Graphite sheets initially coated on one side with metal may be formed on both sides by laminating two single-side coated films with the coated surfaces facing outwardly, respectively. on both outer sides, metal-coated laminates of graphite sheets are produced.
  • vapor deposition systems which make lower demands on the tensile strength of the film to be coated, so that no lamination is necessary, a two-sided coating in one pass is possible.
  • the graphite foils to be coated have a density of at most 1.9 g / cm 3 , preferably from 0.3 to 1.9 g / cm 3 and particularly preferably from 0.3 to 1.3 g / cm 3 .
  • the graphite foil may be impregnated with a resin or the like prior to the application of the metal layer to fill and close the pores in the foil. This prevents the metal to be deposited on the film from getting inside the film.
  • Particularly advantageous is impregnation of the film prior to the galvanic or electroless deposition of metal from an electrolyte bath, because the impregnation reduces the penetration of the liquid electrolyte into the pores and thus reduces the expense for the subsequent drying of the coated film.
  • the metal-coated graphite sheets of the present invention may be used, for example, to transfer, dissipate and distribute heat, e.g. be used in electronic devices.
  • the use of graphite foil for thermal management in electronic devices is known, for example, from US Pat. No. 6,482,520. This document discloses a thermal management device comprising a heat source in contact on one of its outer surfaces with a heat-dissipating graphite foil, a so-called thermal interface.
  • the surface of the graphite foil facing away from the heat source is in contact with a heat sink.
  • the metal coatings proposed according to the invention combine the advantage of protecting the surface against the exfoliation of graphite particles with the advantage of thermal conductivity.
  • the thermal conductivity is anisotropic with preferential heat conduction in the film plane, whereas in metals it is isotropic.
  • the metal layer which conducts heat to a high degree due to its isotropy the same can be effected.
  • Coated graphite films according to the invention are used, for example, for the production of heat exchangers, heat spreaders, heat sinks or bipolar cooling plates for fuel cell stacks.
  • the inventive combination of lateral conduction of electric current or heat in the graphite foil and isotropic conduction of electric current or heat in the Metal layer be exploited.
  • the required semi-finished products for example square or rectangular pieces of foil or film strips, are cut or punched out of the graphite foil coated according to the invention.
  • the desired semifinished products could be cut or punched out of an uncoated film web and then coated.
  • This approach has the advantage that in addition to the flat sides, the edges of the semi-finished products can be provided with the metal coating, so that the semi-finished products are protected in the area of the edges against the breaking, peeling or flaking of graphite particles.
  • Laminates of metal-coated graphite foils can also be used as semi-finished products for the construction of three-dimensional structures.
  • a thin adhesive layer can be applied to the metal coating.
  • this should be as thin as possible in order not to impair the heat transfer to the metal layer. Good results were achieved with 10 ⁇ m thick adhesive layers.
  • non-metal-coated side of the graphite foil is also provided for attachment to another component, this can be done in the same way with a thin layer of adhesive.
  • metal coated graphite sheets may be prefabricated with an adhesive layer on the metal layer and / or on the non-metal coated surface which is covered with a peelable plastic film and peeled off just prior to use.
  • a sheet of graphite foil having a thickness of 0.4 mm and a density of 1.2 g / cm 3 was laminated on one side with a PET film of thickness 12 ⁇ m in order to increase the tensile strength of the graphite foil.
  • the length of the film was about 50 m, the width about 1 m.
  • This film composite of graphite and PET film was vapor-deposited on one side on the non-PET film-covered surface of the graphite foil with aluminum in a continuous high-vacuum coating system. The running speed of the film in the coating system was about 5 m / s.
  • To determine the thickness of the aluminum layer a 30 ⁇ 70 mm 2 sample of the coated film composite was punched. The PET film was mechanically removed from the sample.
  • Atomic emission spectroscopy was used to determine the aluminum content of the remaining graphite-aluminum layer composite (260 ⁇ g). From the area of the sample and the mass of the aluminum layer, the area-related mass of the aluminum layer was determined (0.12 g / m 2 ). Based on the density of aluminum (2.7 g / cm 3 ), the thickness of the vapor-deposited aluminum layer was calculated to be approximately 45 nm.
  • the soldered foil strips adhered very well to the graphite foil.
  • the PET foil laminated with aluminum during the vacuum coating of the graphite foil burned off without residue during the kiln travel. Due to the relatively slow heating bubble formation was prevented by outgassing of the film.
  • soldered plates increases by about 0.4 mm (solder layer) at the superimposed points.
  • An aluminum layer can no longer be determined optically at these locations.
  • the heat sink according to Figure 2 containsdefmnen 4 graphite foil, which protrude from a base plate 5 and dissipate heat therefrom.
  • a base plate 5 On the surface of the base plate 5, which usually consists of metal, recesses for receiving thedefmnen 4 are provided.
  • the cooling fins 4 are soldered in the recesses of the base plate.
  • the cooling fins 4 made of graphite foil are provided with a metal coating according to the invention, at least in the region of their surface which projects into the recess (the fastening region).
  • a base plate made of graphite may be used, in which the wall surfaces of the recesses are coated with metal, so that graphite foil fins, which in the Attachment area are provided with a metal coating according to the invention can be fixed by means of soldering in the recesses of the base plate.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Structural Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Inorganic Chemistry (AREA)
  • Sustainable Energy (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Composite Materials (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Laminated Bodies (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)

Abstract

La présente invention concerne des films de graphite dotés d'un revêtement métallique d'une épaisseur maximale de 100 nm et leur production, par exemple, par métallisation sous vide continue de films de graphique, et leur utilisation. Malgré la faible épaisseur de la couche métallique, les films de graphite peuvent être reliés par brasage en eux ou à d'autres composants en métal ou encore à une matière première dotée d'un revêtement métallique. De plus, la mince couche métallique protège la surface du film de graphite contre le détachement, l'écaillage ou l'éclatement de particules.
EP06753638A 2005-06-21 2006-05-16 Film de graphite dote d'un revetement metallique Withdrawn EP1893550A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06753638A EP1893550A1 (fr) 2005-06-21 2006-05-16 Film de graphite dote d'un revetement metallique

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP05013340A EP1746077A1 (fr) 2005-06-21 2005-06-21 Feuille en graphite avec une couche en métal
PCT/EP2006/004601 WO2006136242A1 (fr) 2005-06-21 2006-05-16 Film de graphite dote d'un revetement metallique
EP06753638A EP1893550A1 (fr) 2005-06-21 2006-05-16 Film de graphite dote d'un revetement metallique

Publications (1)

Publication Number Publication Date
EP1893550A1 true EP1893550A1 (fr) 2008-03-05

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WO (1) WO2006136242A1 (fr)

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US20080149322A1 (en) 2008-06-26
WO2006136242A1 (fr) 2006-12-28
EP1746077A1 (fr) 2007-01-24
JP2009505850A (ja) 2009-02-12
KR20080031741A (ko) 2008-04-10
CN101193837A (zh) 2008-06-04

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