EP1804978B1 - Procede permettant d'appliquer une couche de revetement sur des joints d'etancheite plans - Google Patents

Procede permettant d'appliquer une couche de revetement sur des joints d'etancheite plans Download PDF

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Publication number
EP1804978B1
EP1804978B1 EP05788809A EP05788809A EP1804978B1 EP 1804978 B1 EP1804978 B1 EP 1804978B1 EP 05788809 A EP05788809 A EP 05788809A EP 05788809 A EP05788809 A EP 05788809A EP 1804978 B1 EP1804978 B1 EP 1804978B1
Authority
EP
European Patent Office
Prior art keywords
polymer material
accordance
coating
stream
flat gasket
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
EP05788809A
Other languages
German (de)
English (en)
Other versions
EP1804978A1 (fr
Inventor
Hans Rainer Zerfass
Peter Schenk
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.)
ElringKlinger AG
Original Assignee
ElringKlinger AG
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 ElringKlinger AG filed Critical ElringKlinger AG
Publication of EP1804978A1 publication Critical patent/EP1804978A1/fr
Application granted granted Critical
Publication of EP1804978B1 publication Critical patent/EP1804978B1/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
    • B05D1/08—Flame spraying
    • B05D1/10—Applying particulate materials

Definitions

  • the invention relates to a method for coating flat gaskets with a polymer material and flat gaskets, which are produced by the process according to the invention.
  • Polymer materials are applied to flat gaskets in a variety of ways to form there sealing elements, which are exposed to the chemical attack of engine oil and coolant at high temperatures, especially in flat gaskets, which are used as cylinder head gaskets.
  • the sealing elements due to the relative movements of the cylinder block and cylinder head or more generally the sealingly interconnected components to be mechanically bonded, so that the coatings of the flat gaskets in question must be inert not only chemical attacks and must withstand high temperatures, but also must be sufficiently stable against mechanical stresses.
  • the flat gaskets according to the invention are installed in components in which the gaskets are to be exchanged as seldom as possible, so that very high quality requirements for the gaskets and thus high reliability of the production processes are required.
  • Polymer materials have been applied to flat gaskets so far by screen printing, applied by conventional powder coating or but also sprayed in dissolved form on the seal and sprayed in some cases as a plasticized melt to the gasket layers.
  • the object of the invention is to propose a method with which polymer materials, in particular high-performance polymer materials can be applied in a simple manner as a coating on flat gaskets, which avoids the aforementioned disadvantages. Nevertheless, the coatings must meet the requirements for sealing elements of flat gaskets described above.
  • the polymer material is applied by means of thermal spraying as a layer on a surface of the gasket, wherein the polymer material suspended in powder form, in particular in a carrier gas, accompanied by a compressed gas stream is injected into a stream of hot gas, wherein the pressure gas stream is metered so that the temperature of the polymer material does not reach its decomposition temperature.
  • the polymer material can be sprayed onto the flat gasket in a targeted manner and with relatively low outlay on equipment, so that the sealing elements produced in this way fulfill the requirements described above in an excellent manner.
  • the process according to the invention can be used to process high-performance polymer materials which can otherwise only be processed with problems by one or the other conventional coating methods which have hitherto been used in flat gaskets.
  • the powdery polymeric material is typically suspended in an inert carrier gas (e.g., nitrogen or compressed air) injected into the hot gas, such as combustion gases or gas plasma exiting through a nozzle.
  • an inert carrier gas e.g., nitrogen or compressed air
  • the polymer particles Upon impact, the polymer particles are pressed by deformation of their kinetic energy in deformation against the substrate surface and deformed, the deformation of the polymer particles is still favored by the heating occurring in the hot gas.
  • the polymer particles Upon contact with the substrate, the polymer particles cool and solidify.
  • the sprayed-on layers adhere, in particular also by mechanical interlocking with the substrate, so that an affinity of the polymer particles to the substrate is not absolutely necessary from a chemical point of view. This means that chemical binding forces or chemical adhesion forces are not absolutely necessary to produce a sufficiently strong bond between the polymeric materials and the substrate.
  • Thermal spraying is widely used in the processing of metals and ceramics, and in view of the higher temperature sensitivity of polymer materials, these have only been occasionally processed by such processes.
  • thermal spraying coatings on flat gaskets can be achieved, which have a very good mechanical stability and also can withstand the attack of engine oil and coolant very well.
  • the substrate surface it may be advisable to treat or coat it before the coating according to the invention with a conventional adhesion promoter adapted to the substrate surface and the polymer material to be applied.
  • the method according to the invention has the further advantage over electrostatic powder coating that selective or partial coating the substrate surface can be made without the use of masks.
  • the temperature to which the polymeric material is heated during thermal spraying is adjusted by regulating the residence time of the polymer material in the heating gas.
  • the process can be carried out so that the polymer material is injected centrally into the stream of the hot gas while the pressurized gas stream is injected coaxially to the polymer material such that direct contact of the polymer material with the hot gas is avoided.
  • the surface to be coated is preheated, so that the cooling of the particles does not happen too quickly.
  • the preheating of the surface to be coated has the advantage that a tendency to crack formation in the coating is reduced.
  • the polymer materials to be used for the coating are preferably high-performance plastics, which in particular comprise components which are selected from perfluorohydrocarbon polymers, perfluoroalkoxycopolymers, polyether ether ketones and polyaryl sulfides.
  • the surfaces of the flat gasket, which are to be coated by the method according to the invention, are preferably metal surface films and the gaskets produced according to the invention are, in particular, metal gaskets.
  • the polymer material layer which is applied to the flat gaskets with the method according to the invention can in particular also be designed as a wear protection layer.
  • the method according to the invention is also suitable for coating surfaces of the flat gasket, which have already been provided, at least in regions, with a deformable layer prior to coating by means of thermal spraying. This may be a full-surface coating of these pre-coated surfaces or a partial coating.
  • the deformable layer is preferably applied by screen printing prior to thermal spraying.
  • the deformable layers are preferably formed as a deformable layer for improving the initial tightness of the flat gasket.
  • such layers which serve to improve the initial tightness, are elastically deformable and, immediately after assembly, before the sealing materials settle, ensure sufficient tightness of the connection.
  • the thermal spraying can be carried out in various embodiments, on the one hand as flame spraying, as plasma spraying, or as high-speed flame spraying, in each case injecting the polymer powder into the hot gas stream.
  • the invention also relates to a flat gasket which has been produced by one of the abovementioned methods according to the invention.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Gasket Seals (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Paints Or Removers (AREA)

Claims (14)

  1. Procédé pour le revêtement de joints plats avec un matériau polymère, caractérisé en ce que le matériau polymère est appliqué au moyen d'une pulvérisation thermique comme une couche sur une surface du joint plat, le matériau polymère étant injecté dans une forme pulvérulente, en particulier mis en suspension dans un gaz porteur, accompagné d'un courant de gaz sous pression dans un courant d'un gaz chaud, le courant de gaz sous pression étant dosé de telle sorte que la température du matériau polymère n'atteint pas sa température de décomposition.
  2. Procédé selon la revendication 1, caractérisé en ce que la température à laquelle le matériau polymère est chauffé pendant la pulvérisation thermique est ajustée par régulation du temps de séjour du matériau polymère dans le gaz chaud.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le matériau polymère est injecté de manière centrale dans le courant du gaz chaud pendant que le courant de gaz sous pression est introduit coaxialement par rapport au matériau polymère, de telle sorte que l'on évite un contact direct du matériau polymère avec le gaz chaud.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la surface à recouvrir est munie avant le revêtement d'une structure de surface, en particulier au moyen d'un frottement mécanique ou d'un décapage chimique.
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la surface à recouvrir est préchauffée.
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que le matériau polymère comprend un constituant qui est choisi parmi des polymères perfluorocarbonés, des copolymères perfluoralcoxy, des polyétheréthercétones et des poly(sulfures d'aryle).
  7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le matériau polymère est appliqué sur une surface métallique du joint plat.
  8. Procédé selon la revendication 7, caractérisé en ce que le joint plat est un joint en couches métalliques.
  9. Procédé selon l'une quelconque des revendications 1 à 8, caractérisé en ce que la couche de matériau polymère est appliquée comme une couche de protection à l'usure.
  10. Procédé selon l'une quelconque des revendications 1 à 9, caractérisé en ce que, avant le revêtement par pulvérisation thermique, la surface du joint plat est munie d'une couche déformable au moins par domaine.
  11. Procédé selon la revendication 10, caractérisé en ce que la couche déformable est appliquée au moyen d'une sérigraphie.
  12. Procédé selon la revendication 10 ou 11, caractérisé en ce que la couche déformable sert à améliorer l'étanchéité initiale du joint plat.
  13. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la pulvérisation thermique est réalisée comme une projection à la flamme, une projection au plasma ou une projection à la flamme à vitesse élevée.
  14. Joint plat préparé selon un procédé selon une ou plusieurs des revendications précédentes.
EP05788809A 2004-09-23 2005-09-22 Procede permettant d'appliquer une couche de revetement sur des joints d'etancheite plans Not-in-force EP1804978B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004046111A DE102004046111A1 (de) 2004-09-23 2004-09-23 Verfahren zum Beschichten von Flachdichtungen
PCT/EP2005/010234 WO2006032489A1 (fr) 2004-09-23 2005-09-22 Procede permettant d'appliquer une couche de revetement sur des joints d'etancheite plans

Publications (2)

Publication Number Publication Date
EP1804978A1 EP1804978A1 (fr) 2007-07-11
EP1804978B1 true EP1804978B1 (fr) 2008-03-26

Family

ID=35539607

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05788809A Not-in-force EP1804978B1 (fr) 2004-09-23 2005-09-22 Procede permettant d'appliquer une couche de revetement sur des joints d'etancheite plans

Country Status (4)

Country Link
EP (1) EP1804978B1 (fr)
AT (1) ATE390214T1 (fr)
DE (2) DE102004046111A1 (fr)
WO (1) WO2006032489A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010013545A1 (de) * 2010-03-29 2011-09-29 Elringklinger Ag Abgasstrang-Flachdichtung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3618786A1 (de) * 1986-06-04 1987-12-10 Goetze Ag Flachdichtung, insbesondere fuer verbrennungskraftmaschinen
US4934595A (en) * 1988-08-19 1990-06-19 Plastic Flamecoat Systems, Inc. Method and aparatus for spray coating
KR930012290A (ko) * 1991-12-23 1993-07-20 원본 미기재 화염용사된 복합재료 피막
DE19541268B4 (de) * 1995-11-06 2004-12-02 Adam Opel Ag Metallische Flachdichtung
EP0988898A3 (fr) * 1998-09-23 2001-05-02 Camco International Inc. Pulvérisation thermique de materiaux polymériques
AU2003285268A1 (en) * 2002-11-19 2004-06-15 Erwin Dieter Huhne Low-temperature high-velocity flame spraying system
US6969231B2 (en) * 2002-12-31 2005-11-29 General Electric Company Rotary machine sealing assembly

Also Published As

Publication number Publication date
WO2006032489A1 (fr) 2006-03-30
ATE390214T1 (de) 2008-04-15
EP1804978A1 (fr) 2007-07-11
DE502005003506D1 (de) 2008-05-08
DE102004046111A1 (de) 2006-04-06

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