US20080245512A1 - Heat Exchanger, In Particular Exhaust Gas Heat Exchanger - Google Patents
Heat Exchanger, In Particular Exhaust Gas Heat Exchanger Download PDFInfo
- Publication number
- US20080245512A1 US20080245512A1 US12/066,588 US6658806A US2008245512A1 US 20080245512 A1 US20080245512 A1 US 20080245512A1 US 6658806 A US6658806 A US 6658806A US 2008245512 A1 US2008245512 A1 US 2008245512A1
- Authority
- US
- United States
- Prior art keywords
- heat exchanger
- coating
- exhaust gas
- sol
- aluminum
- 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.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
- F28F19/06—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of metal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
Definitions
- the invention relates to a heat exchanger, in particular an exhaust gas heat exchanger, having at least one metal surface, in particular an aluminum or special steel surface, on which a medium, in particular exhaust gas, impinges and which is provided with a coating.
- the invention also relates to a method of manufacturing a heat exchanger as described above.
- exhaust gas In exhaust gas heat exchangers, exhaust gas, predominantly from diesel engines, together with moisture and heat, leads to corrosion attacks on the metals used. Heat-resistant paints may be used to protect against corrosion.
- the object of the invention is to create a heat exchanger, in particular an exhaust gas heat exchanger, having at least one metal surface, in particular an aluminum or special steel surface, on which a medium, in particular exhaust gas, impinges and which is provided with a coating, said coating possessing better characteristics than conventional paints, and manufacture of the heat exchanger being reliable.
- the object is achieved in that the coating comprises a coating material, which is based on nanotechnology.
- the coating material preferably comprises at least one nanomaterial or nanostructure.
- the coating is vitreous and possesses a very good chemical resistance.
- a preferred exemplary embodiment of the heat exchanger is characterized in that the coating comprises a main constituent, which is composed of an organic and an inorganic fraction. It is possible, by way of the cross-linking temperature, to define and to vary the characteristics of the coating within wide limits.
- a further preferred exemplary embodiment of the heat exchanger is characterized in that the coating contains silicon.
- Organo(alkoxy)silanes are preferably purposely hydrolyzed by the use of suitable catalysts, eliminating alcohols.
- the coating contains titanium, zirconium, aluminum, magnesium, zinc and/or calcium.
- the inorganic network can be purposely modified by the various substances.
- the aforesaid object is achieved in that the coating is produced by a sol-gel process.
- a sol is converted into a gel to produce nano-materials.
- nano-materials Through hydrolysis and condensation reactions a three-dimensional network of interlayered molecules is produced in a liquid.
- Thermal processing stages serve to process the gels further into nano-materials or nanostructures.
- a preferred exemplary embodiment of the method is characterized in that at least one sol is applied to the surface to be coated.
- the surface to be coated may be wetted with the sol in any suitable way.
- a further preferred exemplary embodiment of the method is characterized in that the sol is cured.
- the curing is preferably performed under the effect of heat.
- a further preferred exemplary embodiment of the method is characterized by the following process steps: a heat exchanger to be coated is flooded with the coating material and drained; the drained heat exchanger is heated in a drying oven. The heat exchanger to be coated is force-flooded by the coating substance and then drained. The heat exchanger is then preferably suspended so that all excess coating substance can run off without unwanted accumulations of coating substance being formed inside the heat exchanger. Drops adhering to the outlet from the heat exchanger are suitably removed, for example by means of compressed air or with the aid of an electrostatic droplet extractor.
- the invention relates to an exhaust gas heat exchanger made from aluminum or special steel.
- the exhaust gas heat exchanger has a cavity, through which exhaust gas flows when the exhaust gas heat exchanger is in operation.
- the cavity is coated with a nanotechnology-based coating substance.
- the main constituent of the coating substance is composed of an organic and an inorganic fraction. It is possible, by way of the cross-linking temperature, to define the characteristics of the coating within wide limits. At high stoving temperatures a higher proportion of the organic contents is expelled, that is to say there is a greater degree of crosslinking. The corrosion resistance of the coating is thereby improved. At low stoving temperatures the proportion of organic contents is greater, that is to say the ductility of the coating becomes greater.
- an exhaust gas heat exchanger to be coated is force-flooded with the coating substance and then drained.
- the heat exchanger is then suspended so that all excess coating substance can run off without forming unwanted accumulations in the interior. Drops adhering to the outlet are suitably removed, for example by means of compressed air or with the aid of an electrostatic droplet extractor.
- the exhaust gas heat exchanger then runs through a drying oven.
- the coating is here produced by a sol-gel process, for example by so-called ORMOCER layers.
- ORMOCER relates to a trademark of the Fraunhofer Deutschen Weg for the advancement of applied research in Kunststoff.
- organo(alkoxyl)silanes are purposely hydrolyzed through the use of suitable catalysts for the elimination of alcohols, such as methanol, ethanol, etc.
- suitable catalysts for the elimination of alcohols, such as methanol, ethanol, etc.
- Subsequent condensation reactions lead to the formation of organically modified inorganic-oxidic structures.
- silicon can also be partially replaced by other elements, especially titanium, zirconium or aluminum.
- the elements magnesium, zinc and calcium can be incorporated.
- the aqueous-alcoholic sols are applied to the heat exchanger to be coated in the flooding process, and heat-cured. In this way a cross-linked polymer layer is produced.
- the purpose of the coating in addition to the anticorrosive and/or water-repellent characteristic, is also at the same time to prevent dirt, particles, soot and oil films from adhering.
- this oleophobic effect can be achieved by a fraction of 0.1 to 10%, preferably 0.5 to 5% and in particular by 1 to 2% of fluorosilanes in the ORMOCER layer.
- the incorporation of a layer of simultaneously hydrophobic and oleophobic nature is achieved by the addition of an alkoxysilane with highly fluorinated alkyl chains.
- Particularly beneficial effects are achieved here by silanes of the F13(CF 3 —(CF 2 ) 5 —) and F16(CF 2 H—(CF 2 ) 7 —) type.
Abstract
The invention relates to a heat exchanger, in particular an exhaust gas heat exchanger, having at least one surface which is impinged on by a medium, in particular exhaust gas, is made from metal, in particular aluminum or stainless steel, and is provided with a coating. In order to improve the properties of the coating, according to the invention, the coating comprises a coating material based on nanotechnology.
Description
- The invention relates to a heat exchanger, in particular an exhaust gas heat exchanger, having at least one metal surface, in particular an aluminum or special steel surface, on which a medium, in particular exhaust gas, impinges and which is provided with a coating. The invention also relates to a method of manufacturing a heat exchanger as described above.
- In exhaust gas heat exchangers, exhaust gas, predominantly from diesel engines, together with moisture and heat, leads to corrosion attacks on the metals used. Heat-resistant paints may be used to protect against corrosion.
- The object of the invention is to create a heat exchanger, in particular an exhaust gas heat exchanger, having at least one metal surface, in particular an aluminum or special steel surface, on which a medium, in particular exhaust gas, impinges and which is provided with a coating, said coating possessing better characteristics than conventional paints, and manufacture of the heat exchanger being reliable.
- In a heat exchanger, in particular an exhaust gas heat exchanger, having at least one metal surface, in particular an aluminum or special steel surface, on which a medium, in particular exhaust gas, impinges and which is provided with a coating, the object is achieved in that the coating comprises a coating material, which is based on nanotechnology. The coating material preferably comprises at least one nanomaterial or nanostructure. The coating is vitreous and possesses a very good chemical resistance.
- A preferred exemplary embodiment of the heat exchanger is characterized in that the coating comprises a main constituent, which is composed of an organic and an inorganic fraction. It is possible, by way of the cross-linking temperature, to define and to vary the characteristics of the coating within wide limits.
- A further preferred exemplary embodiment of the heat exchanger is characterized in that the coating contains silicon. Organo(alkoxy)silanes are preferably purposely hydrolyzed by the use of suitable catalysts, eliminating alcohols.
- Further preferred exemplary embodiments of the heat exchanger are characterized in that the coating contains titanium, zirconium, aluminum, magnesium, zinc and/or calcium. The inorganic network can be purposely modified by the various substances.
- In a method of manufacturing a heat exchanger as described above, in particular an exhaust gas heat exchanger, the aforesaid object is achieved in that the coating is produced by a sol-gel process. In the sol-gel process a sol is converted into a gel to produce nano-materials. Through hydrolysis and condensation reactions a three-dimensional network of interlayered molecules is produced in a liquid. Thermal processing stages serve to process the gels further into nano-materials or nanostructures.
- A preferred exemplary embodiment of the method is characterized in that at least one sol is applied to the surface to be coated. The surface to be coated may be wetted with the sol in any suitable way.
- A further preferred exemplary embodiment of the method is characterized in that the sol is cured. The curing is preferably performed under the effect of heat.
- A further preferred exemplary embodiment of the method is characterized by the following process steps: a heat exchanger to be coated is flooded with the coating material and drained; the drained heat exchanger is heated in a drying oven. The heat exchanger to be coated is force-flooded by the coating substance and then drained. The heat exchanger is then preferably suspended so that all excess coating substance can run off without unwanted accumulations of coating substance being formed inside the heat exchanger. Drops adhering to the outlet from the heat exchanger are suitably removed, for example by means of compressed air or with the aid of an electrostatic droplet extractor.
- Further advantages, features and details of the invention are set forth in the following description, in which various exemplary embodiments are described in detail. The features mentioned in the claims and in the description may here each be essential for the invention either individually or in any combination.
- The invention relates to an exhaust gas heat exchanger made from aluminum or special steel. The exhaust gas heat exchanger has a cavity, through which exhaust gas flows when the exhaust gas heat exchanger is in operation. The cavity is coated with a nanotechnology-based coating substance. The main constituent of the coating substance is composed of an organic and an inorganic fraction. It is possible, by way of the cross-linking temperature, to define the characteristics of the coating within wide limits. At high stoving temperatures a higher proportion of the organic contents is expelled, that is to say there is a greater degree of crosslinking. The corrosion resistance of the coating is thereby improved. At low stoving temperatures the proportion of organic contents is greater, that is to say the ductility of the coating becomes greater.
- According to one aspect of the present invention an exhaust gas heat exchanger to be coated is force-flooded with the coating substance and then drained. The heat exchanger is then suspended so that all excess coating substance can run off without forming unwanted accumulations in the interior. Drops adhering to the outlet are suitably removed, for example by means of compressed air or with the aid of an electrostatic droplet extractor. The exhaust gas heat exchanger then runs through a drying oven.
- The coating is here produced by a sol-gel process, for example by so-called ORMOCER layers. The term ORMOCER relates to a trademark of the Fraunhofer Gesellschaft for the advancement of applied research in Munich. To produce layers, organo(alkoxyl)silanes are purposely hydrolyzed through the use of suitable catalysts for the elimination of alcohols, such as methanol, ethanol, etc. Subsequent condensation reactions lead to the formation of organically modified inorganic-oxidic structures. For modification of the inorganic network, silicon can also be partially replaced by other elements, especially titanium, zirconium or aluminum. In addition the elements magnesium, zinc and calcium can be incorporated. The aqueous-alcoholic sols are applied to the heat exchanger to be coated in the flooding process, and heat-cured. In this way a cross-linked polymer layer is produced.
- The purpose of the coating, in addition to the anticorrosive and/or water-repellent characteristic, is also at the same time to prevent dirt, particles, soot and oil films from adhering. When using ORMOCER layers this oleophobic effect can be achieved by a fraction of 0.1 to 10%, preferably 0.5 to 5% and in particular by 1 to 2% of fluorosilanes in the ORMOCER layer. The incorporation of a layer of simultaneously hydrophobic and oleophobic nature is achieved by the addition of an alkoxysilane with highly fluorinated alkyl chains. Particularly beneficial effects are achieved here by silanes of the F13(CF3—(CF2)5—) and F16(CF2H—(CF2)7—) type.
Claims (9)
1. A heat exchanger, in particular an exhaust gas heat exchanger, having at least one metal surface, in particular an aluminum or special steel surface, on which a medium, in particular exhaust gas, impinges and which is provided with a coating, wherein the coating comprises a coating material, which is based on nanotechnology.
2. The heat exchanger as claimed in claim 1 , wherein the coating comprises a main constituent, which is composed of an organic and an inorganic fraction.
3. The heat exchanger as claimed in claim 1 wherein the coating contains silicon.
4. The heat exchanger as claimed in claim 1 , wherein the coating contains titanium, zirconium and/or aluminum.
5. The heat exchanger as claimed in claim 1 wherein the coating contains magnesium, zinc and/or calcium.
6. A method of manufacturing a heat exchanger, in particular an exhaust gas heat exchanger, as claimed in claim 1 , wherein the coating is produced by a sol-gel process.
7. The method as claimed in claim 6 , wherein at least one sol is applied to the surface to be coated.
8. The method as claimed in claim 7 , wherein the sol is cured in order to form a cross-linked polymer layer.
9. The method as claimed in claim 6 , characterized by the following process steps:
a) a heat exchanger to be coated is flooded with the coating material and drained;
b) the drained heat exchanger is heated in a drying oven and/or has a flow of hot gas, in particular hot air, passed through it.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005043730A DE102005043730A1 (en) | 2005-09-14 | 2005-09-14 | Heat exchanger, in particular exhaust gas heat exchanger |
DE102005043730.3 | 2005-09-14 | ||
PCT/EP2006/008851 WO2007031262A1 (en) | 2005-09-14 | 2006-09-12 | Heat exchanger, in particular exhaust gas heat exchanger |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080245512A1 true US20080245512A1 (en) | 2008-10-09 |
Family
ID=37507708
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/066,588 Abandoned US20080245512A1 (en) | 2005-09-14 | 2006-09-12 | Heat Exchanger, In Particular Exhaust Gas Heat Exchanger |
Country Status (7)
Country | Link |
---|---|
US (1) | US20080245512A1 (en) |
EP (1) | EP1926962A1 (en) |
JP (1) | JP2009508080A (en) |
CN (1) | CN101305255A (en) |
DE (1) | DE102005043730A1 (en) |
RU (1) | RU2430323C2 (en) |
WO (1) | WO2007031262A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120111549A1 (en) * | 2010-11-09 | 2012-05-10 | Denso Corporation | Heat transport fluid passage device with hydrophobic membrane |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008033222A1 (en) | 2008-07-15 | 2010-01-21 | Behr Gmbh & Co. Kg | Producing a part of a heat exchanger comprising aluminum and/or aluminum alloy and having a corrosion protected surface, comprises applying zinc or zinc-containing layer to the surface or part of the surface |
DE102008062705A1 (en) | 2008-12-18 | 2010-06-24 | Behr Gmbh & Co. Kg | Coating method and coating apparatus for manufacturing a component and heat exchangers and use of the heat exchanger |
JP5934569B2 (en) * | 2012-04-27 | 2016-06-15 | 日立Geニュークリア・エナジー株式会社 | Heat exchanger with protective member |
DE102013215386A1 (en) * | 2013-08-05 | 2015-02-05 | Behr Gmbh & Co. Kg | Heat exchanger made of aluminum and method for producing a surface coating on a heat exchanger made of aluminum |
Citations (10)
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WO2004087338A2 (en) * | 2003-03-31 | 2004-10-14 | Behr Gmbh & Co. Kg | Heat exchanger and method for treating the surface of said heat exchanger |
WO2004104082A2 (en) * | 2003-05-26 | 2004-12-02 | Leibniz-Institut Für Neue Materialien Gemeinnützige Gmbh | Composition having a non-newtonian behavior |
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US20070114011A1 (en) * | 2003-11-26 | 2007-05-24 | Behr Gmbh & Co. Kg | Heat exchanger |
US20070131394A1 (en) * | 2004-02-03 | 2007-06-14 | Friedhelm Schmitz | Heat exchanger tube, heat exchanger and use |
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DE19813709A1 (en) * | 1998-03-27 | 1999-09-30 | Inst Neue Mat Gemein Gmbh | Process for protecting a metallic substrate from corrosion |
JP2000329497A (en) * | 1999-05-19 | 2000-11-30 | Toyobo Co Ltd | Fin for heat exchanger in car air conditioner |
JP2000329495A (en) * | 1999-05-21 | 2000-11-30 | Nissan Motor Co Ltd | Heat exchanger for air conditioner and surface treating method therefor |
JP2001247822A (en) * | 2000-03-06 | 2001-09-14 | Kansai Paint Co Ltd | Composition and method for treatment for imparting hydrophilic property |
DE10045606A1 (en) * | 2000-09-15 | 2002-03-28 | Volkswagen Ag | Oligodynamic coating for the inner metallic surfaces of automobile air conditioners comprises matrix based on (hetero)-polysiloxanes, nano-scale heavy metal particles and an optional corrosion inhibitor |
DE20018520U1 (en) * | 2000-10-28 | 2001-02-01 | Pucel Markus | Filter-free heat exchangers with nano-technology |
-
2005
- 2005-09-14 DE DE102005043730A patent/DE102005043730A1/en not_active Withdrawn
-
2006
- 2006-09-12 WO PCT/EP2006/008851 patent/WO2007031262A1/en active Application Filing
- 2006-09-12 CN CNA2006800420459A patent/CN101305255A/en active Pending
- 2006-09-12 JP JP2008530399A patent/JP2009508080A/en active Pending
- 2006-09-12 EP EP06805687A patent/EP1926962A1/en not_active Withdrawn
- 2006-09-12 RU RU2008114316/06A patent/RU2430323C2/en not_active IP Right Cessation
- 2006-09-12 US US12/066,588 patent/US20080245512A1/en not_active Abandoned
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US7060329B2 (en) * | 1999-12-03 | 2006-06-13 | Caterpillar Inc | Patterned hydrophilic-oleophilic metal oxide coating and method of forming |
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US20050161206A1 (en) * | 2003-12-19 | 2005-07-28 | Peter Ambros | Heat exchanger with flat tubes |
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Title |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120111549A1 (en) * | 2010-11-09 | 2012-05-10 | Denso Corporation | Heat transport fluid passage device with hydrophobic membrane |
US9022099B2 (en) * | 2010-11-09 | 2015-05-05 | Denso Corporation | Heat transport fluid passage device with hydrophobic membrane |
Also Published As
Publication number | Publication date |
---|---|
RU2008114316A (en) | 2009-10-20 |
DE102005043730A1 (en) | 2007-03-22 |
CN101305255A (en) | 2008-11-12 |
WO2007031262A1 (en) | 2007-03-22 |
EP1926962A1 (en) | 2008-06-04 |
RU2430323C2 (en) | 2011-09-27 |
JP2009508080A (en) | 2009-02-26 |
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Legal Events
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AS | Assignment |
Owner name: BEHR GMBH & CO. KG, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FISCHLE, KLAUS;GROSS, DIETER;MAMBER, OLIVER;AND OTHERS;REEL/FRAME:020920/0566 Effective date: 20080408 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |