EP1800764B1 - Procédé de revêtement des feuilles de graphite - Google Patents

Procédé de revêtement des feuilles de graphite Download PDF

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Publication number
EP1800764B1
EP1800764B1 EP20060125967 EP06125967A EP1800764B1 EP 1800764 B1 EP1800764 B1 EP 1800764B1 EP 20060125967 EP20060125967 EP 20060125967 EP 06125967 A EP06125967 A EP 06125967A EP 1800764 B1 EP1800764 B1 EP 1800764B1
Authority
EP
European Patent Office
Prior art keywords
coating
graphite foil
coated
coating material
particles
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.)
Not-in-force
Application number
EP20060125967
Other languages
German (de)
English (en)
Other versions
EP1800764A1 (fr
Inventor
Ludger Fischer
Martin Christ
Werner Langer
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
Priority claimed from EP05027845A external-priority patent/EP1800763A1/fr
Application filed by SGL Carbon SE filed Critical SGL Carbon SE
Priority to EP20060125967 priority Critical patent/EP1800764B1/fr
Publication of EP1800764A1 publication Critical patent/EP1800764A1/fr
Application granted granted Critical
Publication of EP1800764B1 publication Critical patent/EP1800764B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/06—Applying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08—Plant for applying liquids or other fluent materials to objects

Definitions

  • the present invention relates to a method for coating flat structures made of graphite foil with a flat side and the edges covering protective or insulating layer.
  • a coating in the spraying process can be carried out, for example, with a material present as a powder or as a melt. If the edge surfaces are sprayed directly on, the unavoidable overspray on the front side of the workpiece results in an increased material consumption as well as an undesirable increase in the thickness of the spray layer on the front side of the workpiece. If the spraying process including the edge coating is to be automated, the spraying apparatus would have to have an additional movement axis in the z-direction parallel to the vertical extent in addition to the axes of movement in the x and y directions, ie parallel to the front of the workpiece to be coated Have (thickness) of the workpiece to be coated.
  • the object of the present invention is to provide a spray process for coating flat structures made of graphite foil with a flat side and the edge surfaces covering protective, insulating or other functional layer, which overcomes the aforementioned disadvantages of the prior art.
  • This object is achieved by applying the coating material by electrostatic powder spraying followed by a sintering cycle or a melting cycle on the flat side to be coated (front side) of the sheet-like structure made of graphite foil, wherein during the spraying the sheet-like structure of graphite foil on a limited Surface is contacted almost in the middle of its back facing away from the spraying direction electrically.
  • Limited area here means at least 5 mm away from the edges. Due to the layer plane structure of the graphite, the electrical conductivity in the film plane is significantly higher than perpendicular to the film plane. As a result of this anisotropy of the electrical conductivity of the graphite foil, a field line pattern is formed which is suitable for co-coating the edge surfaces. Therefore, in the method of the invention, only two axes of movement (in the x and y directions) are required for the spray device.
  • the art of electrostatic powder coating is known in the art. It is based on the fact that bodies attract with opposite electric charge. An electric field forms between the spray head and the grounded workpiece. The powder particles follow its field lines and adhere to the workpiece due to the residual charge. Thus, the powder settles on the surface of the workpiece and penetrates even in the smallest microfine unevenness of the surface. In this condition, the coated workpiece must be baked for a short time at 160 to 280 ° C for about 15 to 30 minutes. Temperature and duration of this so-called baking process depend on the composition of the selected coating. During this process, particles sprayed together on sintering together or the particles sprayed together melt to form a highly viscous melt, so that a coherent, uniform, self-contained surface coating is formed. Thereafter, the coated workpiece is allowed to cool.
  • the entire process described above including heating to the melting or sintering temperature, the holding time at this temperature and the subsequent cooling to solidify the coating, are referred to herein as the sintering cycle.
  • the sintering cycle usually, layers produced in this way, for example on workpieces made of metal, serve for corrosion protection or as a decorative layer.
  • the typical layer thicknesses are in the range of 0.1 to 0.2 mm in order to achieve the mentioned effects.
  • planar structures of graphite foil to be coated can be, for example, square or rectangular, but of course other geometric shapes are also possible, depending on the intended use.
  • the method according to the invention is used, for example, to provide sheet-like structures made of graphite foil, which are used as heat conductors (so-called heat spreaders or thermal interface) in electronic devices, with a protective layer which prevents the break-off, peeling or flaking off of graphite particles from the surface or surface prevents the edges of the graphite foil ("antiflaking" coating) or / and acts as an electrical insulating layer.
  • Suitable coating materials for these purposes are, for example, thermoplastics such as polyethylene, polypropylene and polyester.
  • the coating material is a polymeric binder which contains thermally conductive particles.
  • the thermally conductive particles are preferably not electrically conductive. This contains, for example, as particles boron nitride in an amount of 1 to 15 wt .-%, in particular hexagonal boron nitride in an amount of 5 to 10 wt .-% is contained in the polymeric binder.
  • the layer thickness is only 5 to 10 microns in order to affect the heat transfer as little as possible.
  • the nozzles of the spray head and the speed of movement of the spray head these can be achieved for the electrostatic spraying atypically low layer thicknesses.
  • heating takes place at a temperature between 160 and 280.degree. This temperature is maintained for about 15 to 30 minutes.
  • the sheet-like structure to be coated made of graphite foil 1 is placed on a conductive substrate 2, or the counter electrode is connected with a crocodile clip on the edge of the sheet-like structure 1 made of graphite foil.
  • a field line course 5 is formed between graphite foil 1 and spray head 3 FIG. 1 .
  • the powder deposition is therefore exclusively on the front side 1a of the graphite foil, the edges 1b are not co-coated.
  • Co-coating of the conductive pad 2 may be accomplished, for example, by a non-conductive cover (in FIG. 1 for clarity, not shown) can be avoided.
  • the layer thickness of the applied coating 6 was about 10 microns.
  • a sheet-like workpiece 1 'made of metal is punctiform contacted in the middle of the non-coated back side 1c (contact 4).
  • the pad 2 is not conductive. Since the electrical conductivity is isotropic in metals (irrespective of the direction), the field line profile 5 results between workpiece 1 'and spray head 3 FIG. 2 , Therefore, when vertical spraying of an electrically isotropic workpiece 1, the edges 1b are not coated.
  • the layer thickness of the applied coating 6 was about 10 microns.
  • the planar structure made of graphite foil 1 is punctiformly contacted (contact 4) in the center of the rear side 1c to be coated so that, as a consequence of the electrical anisotropy of the graphite foil, a field line course 5 according to FIG FIG. 3 arises.
  • a co-coating of the edge surfaces 1b now takes place according to the invention.
  • the pad 2 is not conductive.
  • the layer thickness of the applied coating 6 was about 10 microns.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)

Claims (10)

  1. Procédé pour l'application d'un revêtement sur une face plate, notamment sur la face avant et sur les surfaces d'arêtes d'une structure plane en film graphite,
    comprenant les étapes
    • application de la matière de revêtement par poudrage électrostatique
    • cycle de frittage, respectivement cycle de fusion de la poudre vaporisée,
    caractérisé en ce que
    pendant le poudrage, on met en contact électrique la structure plane à revêtir en film graphite sur une surface limitée, à une distance d'au moins 5 mm des bords, pratiquement au milieu de sa face arrière opposée au sens de vaporisation.
  2. Procédé selon la revendication 1, caractérisé en ce que l'épaisseur de couche du revêtement appliqué est au maximum de 10 µm.
  3. Procédé selon la revendication 1, caractérisé en ce que le matière de revêtement est une matière thermoplastique.
  4. Procédé selon la revendication 3, caractérisé en ce que la matière de revêtement est du polyéthyléne, du polypropylène et du polyester.
  5. Procédé selon la revendication 3, caractérisé en ce que la matière de revêtement est un agent de liaison polymère qui contient des particules conductrices thermique.
  6. Procédé selon la revendication 5, caractérisé en ce que les particules conductrices thermique ne sont pas conductrices électrique.
  7. Procédé selon la revendication 5 ou 6, caractérisé en ce que l'agent de liaison polymère contient en tant que particules du nitrure de bore dans une quantité de 1 à 15 % en poids.
  8. Procédé selon la revendication 7, caractérisé en ce que l'agent de liaison polymère contient en tant que particules du nitrure de bore hexagonal dans une quantité de 5 à 10 % en poids.
  9. Procédé selon la revendication 1, caractérisé en ce que pendant le cycle de frittage ou de fusion, il s'effectue un échauffement à une température comprise entre 160 et 280°C et en ce que cette température est maintenue pendant env. de 15 à 30 minutes.
  10. Utilisation des structures planes en film graphite revêtues selon l'une quelconque des revendications 1 à 5 pour la dissipation de chaleur dans des appareils électroniques.
EP20060125967 2005-12-20 2006-12-12 Procédé de revêtement des feuilles de graphite Not-in-force EP1800764B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20060125967 EP1800764B1 (fr) 2005-12-20 2006-12-12 Procédé de revêtement des feuilles de graphite

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05027845A EP1800763A1 (fr) 2005-12-20 2005-12-20 Procédé de revêtement des feuilles de graphite
EP20060125967 EP1800764B1 (fr) 2005-12-20 2006-12-12 Procédé de revêtement des feuilles de graphite

Publications (2)

Publication Number Publication Date
EP1800764A1 EP1800764A1 (fr) 2007-06-27
EP1800764B1 true EP1800764B1 (fr) 2014-06-11

Family

ID=38068828

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060125967 Not-in-force EP1800764B1 (fr) 2005-12-20 2006-12-12 Procédé de revêtement des feuilles de graphite

Country Status (1)

Country Link
EP (1) EP1800764B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3444884A1 (fr) 2017-08-17 2019-02-20 FRAUNHOFER-GESELLSCHAFT zur Förderung der angewandten Forschung e.V. Plaque de contact électroconductrice pour cellules électrochimiques, cellule électrochimique dotée d'une telle plaque de contact ainsi que son procédé de fabrication

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3903328A (en) * 1974-04-26 1975-09-02 Ibm Conductive coating

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3444884A1 (fr) 2017-08-17 2019-02-20 FRAUNHOFER-GESELLSCHAFT zur Förderung der angewandten Forschung e.V. Plaque de contact électroconductrice pour cellules électrochimiques, cellule électrochimique dotée d'une telle plaque de contact ainsi que son procédé de fabrication
DE102017007718A1 (de) 2017-08-17 2019-02-21 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Elektrisch leitfähige Kontaktplatte für elektrochemische Zellen, elektrochemische Zelle mit einer solchen Kontaktplatte sowie Verfahren zu deren Herstellung

Also Published As

Publication number Publication date
EP1800764A1 (fr) 2007-06-27

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