EP1804978A1 - Verfahren zum beschichten von flachdichtungen - Google Patents
Verfahren zum beschichten von flachdichtungenInfo
- Publication number
- EP1804978A1 EP1804978A1 EP05788809A EP05788809A EP1804978A1 EP 1804978 A1 EP1804978 A1 EP 1804978A1 EP 05788809 A EP05788809 A EP 05788809A EP 05788809 A EP05788809 A EP 05788809A EP 1804978 A1 EP1804978 A1 EP 1804978A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- polymer material
- layer
- hot gas
- coating
- thermal spraying
- 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.)
- Granted
Links
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 gaskets with a polymer material and flat gaskets, which are produced by the inventive method.
- Polymer materials are applied to flat gaskets in a variety of ways in order to form sealing elements there which are exposed to the chemical attack of engine oil and coolant at high temperatures, in particular in the case of flat gaskets which are used as cylinder head gaskets.
- the sealing elements are mechanically stressed, so that the coatings of the flat gaskets in question must not only be inert to high levels of chemical attack Temperatures must withstand, but also mechanical stresses must be sufficiently stable against.
- the gaskets according to the invention are built into components in which the gaskets are to be replaced 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 hitherto been applied to flat gaskets by screen printing, applied by conventional powder coating methods, or but also sprayed onto the seal in dissolved form and, in some cases, also injected as a plasticized melt onto the sealing 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 to flat gaskets, which avoids the abovementioned disadvantages. Nevertheless, the coatings must be able to meet the requirements for sealing elements of flat gaskets described above.
- the Polymermate ⁇ material is applied by thermal spraying as a layer on a surface of the Flach ⁇ seal, wherein the polymer material in powder form, in particular suspended in a special 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 Zerset ⁇ ting temperature.
- the polymer material can be aimed with thermal spraying and sprayed onto the flat gasket with a relatively low outlay in terms of high quality, 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 pulverulent polymer material is generally suspended in an inert carrier gas (for example nitrogen or compressed air) and injected into the hot gas, such as combustion gases or gas plasma exiting through a nozzle.
- the high temperatures of the hot gas accelerate the powder particles and melt them before they then impact the substrate to be coated.
- the polymer particles are pressed by deformation of their kinetic energy in deformation against the substrate surface and deformed, whereby the deformation of the polymer particles is still favored by the heating occurring in the hot gas.
- the polymer particles cool and solidify.
- the sprayed-on layers adhere, in particular also by a mechanical interlocking with the substrate, so that an affinity of the polymer particles for the substrate in a chemical respect is not absolutely necessary. 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 versatile in use in the processing of metals and ceramic materials, wherein, in view of the higher temperature sensitivity of polymer materials, these have only occasionally been 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 process according to the invention has the further advantage over the electrostatic powder coating that a selective or partial layers of 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 hot gas while the pressurized gas stream is injected coaxially with the polymer material in such a way 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, perfluoroalkoxy copolymers, 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 surfaces and the flat gaskets produced according to the invention are, in particular, metal-sheet gaskets.
- the polymer material layer which is applied to the flat gaskets by 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 before thermal spraying by means of screen printing.
- 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 in particular elastically deformable and ensure, immediately after assembly, before the sealing materials settle, that the tightness of the connection is sufficiently tight.
- 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)
Description
Claims
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 (de) | 2004-09-23 | 2005-09-22 | Verfahren zum beschichten von flachdichtungen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1804978A1 true EP1804978A1 (de) | 2007-07-11 |
EP1804978B1 EP1804978B1 (de) | 2008-03-26 |
Family
ID=35539607
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05788809A Not-in-force EP1804978B1 (de) | 2004-09-23 | 2005-09-22 | Verfahren zum beschichten von flachdichtungen |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1804978B1 (de) |
AT (1) | ATE390214T1 (de) |
DE (2) | DE102004046111A1 (de) |
WO (1) | WO2006032489A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010013545A1 (de) * | 2010-03-29 | 2011-09-29 | Elringklinger Ag | Abgasstrang-Flachdichtung |
Family Cites Families (7)
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 (de) * | 1998-09-23 | 2001-05-02 | Camco International Inc. | Verfahren zum thermischen Besprühen von polymeren Materialien |
EP1603684B1 (de) * | 2002-11-19 | 2009-03-11 | IBEDA Sicherheitsgeräte und Gastechnik GmbH & Co. KG | Niedertemperatur hochgeschwindigkeits-flammspritzsystem |
US6969231B2 (en) * | 2002-12-31 | 2005-11-29 | General Electric Company | Rotary machine sealing assembly |
-
2004
- 2004-09-23 DE DE102004046111A patent/DE102004046111A1/de not_active Withdrawn
-
2005
- 2005-09-22 EP EP05788809A patent/EP1804978B1/de not_active Not-in-force
- 2005-09-22 WO PCT/EP2005/010234 patent/WO2006032489A1/de active IP Right Grant
- 2005-09-22 DE DE502005003506T patent/DE502005003506D1/de active Active
- 2005-09-22 AT AT05788809T patent/ATE390214T1/de not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO2006032489A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE502005003506D1 (de) | 2008-05-08 |
ATE390214T1 (de) | 2008-04-15 |
DE102004046111A1 (de) | 2006-04-06 |
EP1804978B1 (de) | 2008-03-26 |
WO2006032489A1 (de) | 2006-03-30 |
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