EP3307922B1 - Verfahren zur beschichtung der oberfläche eines geschlossenen kühlkanals eines kolbens für einen verbrennungsmotor - Google Patents
Verfahren zur beschichtung der oberfläche eines geschlossenen kühlkanals eines kolbens für einen verbrennungsmotor Download PDFInfo
- Publication number
- EP3307922B1 EP3307922B1 EP16732963.0A EP16732963A EP3307922B1 EP 3307922 B1 EP3307922 B1 EP 3307922B1 EP 16732963 A EP16732963 A EP 16732963A EP 3307922 B1 EP3307922 B1 EP 3307922B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating
- piston
- cooling duct
- cooling channel
- coating agent
- 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
Links
- 239000011248 coating agent Substances 0.000 title claims description 50
- 238000001816 cooling Methods 0.000 title claims description 45
- 238000000576 coating method Methods 0.000 title claims description 29
- 238000000034 method Methods 0.000 title claims description 22
- 238000002485 combustion reaction Methods 0.000 title claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 26
- 229910052582 BN Inorganic materials 0.000 claims description 14
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 14
- 239000000725 suspension Substances 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 10
- -1 polysiloxane Polymers 0.000 claims description 8
- 229920001296 polysiloxane Polymers 0.000 claims description 8
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 6
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 6
- 239000012459 cleaning agent Substances 0.000 claims description 3
- 238000001723 curing Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- 239000004111 Potassium silicate Substances 0.000 claims description 2
- 239000004115 Sodium Silicate Substances 0.000 claims description 2
- 229910052913 potassium silicate Inorganic materials 0.000 claims description 2
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 claims description 2
- 235000019353 potassium silicate Nutrition 0.000 claims description 2
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 2
- 238000001029 thermal curing Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000008199 coating composition Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000011253 protective coating Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007850 degeneration Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/16—Pistons having cooling means
- F02F3/20—Pistons having cooling means the means being a fluid flowing through or along piston
- F02F3/22—Pistons having cooling means the means being a fluid flowing through or along piston the fluid being liquid
- F02F3/225—Pistons having cooling means the means being a fluid flowing through or along piston the fluid being liquid the liquid being directed into blind holes
-
- 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
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
-
- 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
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/16—Pistons having cooling means
- F02F3/20—Pistons having cooling means the means being a fluid flowing through or along piston
- F02F3/22—Pistons having cooling means the means being a fluid flowing through or along piston the fluid being liquid
Definitions
- the present invention relates to a method for coating the surface of a closed, ⁇ lzulauf ⁇ or oil drain holes having cooling channel of a piston for an internal combustion engine with a hexagonal boron nitride-containing coating agent.
- Cooling channel pistons are preferably used in modern internal combustion engines with high specific engine power, since they can dissipate a larger amount of heat compared to only spray-cooled piston during engine operation, so that their maximum operating temperature can be significantly reduced.
- the EP 2 096 290 A1 discloses a non-stick coating based on fluorosilanes.
- This protective coating comprises a polymer-based matrix, in particular a polysiloxane, in which particles, in particular of hexagonal boron nitride, are incorporated.
- Such coatings have, among other things, excellent non-wetting properties for preventing the deposition of thermally insulating solids such as ashes or slags.
- DE10 2011 107659 discloses a method of coating the surface of a closed oil drain (19) bore of a piston for an internal combustion engine with a coating agent containing hexagonal boron nitride.
- the object of the present invention is to develop a generic method so that a uniformly thin coating over the entire surface of the cooling channel can be obtained.
- the solution consists in a process comprising the following process steps: a) introducing a defined amount of a coating agent in the form of a suspension of hexagonal boron nitride with a solution based on at least one thermally curable inorganic binder and at least one solvent in the cooling channel; b) distributing the coating agent on the surface of the cooling channel by moving the piston about at least two spatial axes; c) drying the coating agent distributed on the surface of the cooling channel by means of a laminar air flow; d) thermally curing the coating agent to complete a coating adhering to the surface of the cooling channel.
- the inventive method is characterized in that a piston can be produced, in which the entire surface of the cooling channel is provided with a hexagonal boron nitride-containing coating having a uniform thickness over the entire surface of the cooling channel, which is preferably between 10 .mu.m and 100 .mu.m. This ensures that the
- Heat transfer from the cooling channel is little or not affected.
- the size of the surface of the cooling channel is determined before step a) in order to be able to optimally dose the coating agent.
- an optimal dosage is 7ml, ie about 36.84 ⁇ l per square centimeter.
- the surface of the cooling channel is cleaned with a cleaning agent to improve the adhesion of the coating to the surface.
- Suitable detergents are, for example, methanol, ethanol, acetone, 1-propanol and 2-propanol and other low-chain alcohols.
- the coating composition used in step a) contains as preferred binder at least one polysiloxane, which is preferably dissolved in ethanol.
- sodium and / or potassium silicate can be used, thereby enabling the use of a sol-gel method.
- the piston can, for example, be moved by means of a biaxial mixing device.
- Biaxialmischtechnik are known per se and are usually used for mixing paints and paints.
- step c) a laminar flow of air at a speed of 1 to 2 meters per second is used to avoid that the coating agent is distributed unevenly on the surface of the cooling channel by a too fast air flow.
- the drying of the coating agent is expediently carried out at room temperature.
- the thermal curing may, for example. At a temperature of 180 ° C to 220 ° C are performed.
- the piston 10 has a piston head 11 with a piston head 12, a combustion bowl 13, a circumferential top land 14 and a circumferential ring portion 15 with annular grooves for receiving piston rings (not shown).
- the piston 10 also has a piston shaft 16, which is provided in known manner with piston hubs 17, in which hub bores 18 for receiving a piston pin (not shown) are introduced.
- the piston hubs 17 are connected to each other via running surfaces 19.
- the piston 10 is formed in the embodiment as a one-piece piston made of a steel material.
- a piston base body 21 and a piston upper part 22 are permanently connected to one another by welding or soldering.
- the piston main body 21 and the piston upper part 22 may consist of the same material or different materials.
- the piston body 21 and the piston upper part 22 together form a circulating in the amount of the ring portion 15 cooling channel 23, the oil inlet or.
- the surface 24 of the cooling channel 23 is provided with a coating 25 containing hexagonal boron nitride (hBN).
- the thickness of the coating 25 is preferably 20 ⁇ m to 40 ⁇ m
- Thermal conductivity of the coating 25 is preferably 40W / mK to 50W / mK, depending on the degree of purity of the hexagonal boron nitride.
- the friction coefficient of the coating 25 is constant up to a temperature of 600 ° C and is 0.2.
- the specific surface area of the coating 25, depending on the degree of purity of the hexagonal boron nitride, is 5m 2 / g to 15m 2 / g.
- the surface of the cooling channel 23 is determined in cm 2 in order to be able to optimally dose the coating composition.
- the surface 24 of the cooling channel 23 is thoroughly cleaned with ethanol.
- 10ml to 30ml of ethanol via one of ⁇ lzulauf- or oil drain holes 23 ', 23 "introduced into the cooling channel 23 and the holes 23', 23" closed with plugs (preferably made of a rubber-elastic material)
- the piston 10 is moved to disperse the ethanol in the cooling channel and to ensure that the entire surface 24 is wetted with ethanol.
- a biaxial mixer can be used.
- the plugs are removed, so that the remaining ethanol drains from the cooling channel 23.
- the surface 24 of the cooling channel 23 is dried via one of the bores 23 ', 23 "by means of a laminar air flow at a flow rate of 1 m / s to 2 m / s for five minutes at room temperature.
- the coating agent used is a suspension of particles of hexagonal boron nitride in a polysiloxane dissolved in ethanol.
- the content of hexagonal boron nitride in the suspension in the exemplary embodiment is 104 g / l, based on the volume of the pure polysiloxane solution.
- the content of polysiloxane in the exemplary embodiment is 61 g / l, based on the total volume of the suspension.
- the ethanol content of the suspension in the exemplary embodiment is 647 g / l, based on the total volume of the suspension.
- Such a coating agent is commercially available, for example, under the name HeBoCoat®400E from the manufacturer Henze Boron Nitride Products AG, Grundweg 1, 87493 Lauben purchase. It is essential that the coating agent is free of halogen-containing substances, in particular free of fluorine-containing substances.
- the dosage is based on the size of the surface 24 of the cooling channel 23 in cm 2 .
- An optimum dosage of the suspension is 7 ml for a surface 24 of the cooling channel 23 of 190 cm 2 . In the exemplary embodiment, this corresponds to 4.53 g of ethanol, 0.43 g of polysiloxane and 0.73 g of hBN.
- the coating agent is introduced into the cooling channel 23 via one of the bores 23 ', 23 ", expediently with the aid of a metering device, for example a metering pump
- the bores 23', 23" are closed with plugs, preferably made of a rubber-elastic material.
- the piston 10 is moved by at least two spatial axes. These Movement is essential to evenly distribute the coating agent on the surface 24 of the cooling channel.
- a rotation unit for example.
- a known per se biaxial mixer is used, with which the piston 10 is rotated both about its longitudinal axis and about an axis perpendicular to the longitudinal axis.
- the coating agent adhering to the surface 24 of the cooling channel 23 is dried via one of the bores 23 ', 23 "by means of a laminar air flow at a flow rate of 1 m / s to 2 m / s for about five minutes at room temperature (about 20 ° C.) This drying step is essential to ensure proper uniform drying of the coating agent.
- the flow rate of the laminar airflow must not be too high, otherwise it will be near the holes 23 ', 23 "on the surface 24 of the cooling channel 23 adhering coating agent would be displaced by the air pressure, so that a coating with uneven thickness would result.
- a curing by heat treatment wherein the piston 10 is heated to 180 ° C to 220 ° C during a period of 25min to 60min.
- the polysiloxane is converted to a SiO 2 matrix in which the particles of hexagonal boron nitride are incorporated.
- the resulting coating 25 has a surface energy of 15-17 mN / m and a layer thickness of 20 .mu.m to 40 .mu.m, which is constant over the entire surface 24 of the cooling channel 23. Due to its small layer thickness, the coating 25 has no thermal insulating effect on the material of the piston 10.
- the coating 25 is temperature-resistant up to 600 ° C.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Wood Science & Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Lubricants (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102015007334 | 2015-06-12 | ||
PCT/EP2016/063324 WO2016198618A1 (de) | 2015-06-12 | 2016-06-10 | Verfahren zur beschichtung der oberfläche eines geschlossenen kühlkanals eines kolbens für einen verbrennungsmotor sowie mittels dieses verfahrens herstellbarer kolben |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3307922A1 EP3307922A1 (de) | 2018-04-18 |
EP3307922B1 true EP3307922B1 (de) | 2019-05-22 |
Family
ID=56289464
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16732963.0A Not-in-force EP3307922B1 (de) | 2015-06-12 | 2016-06-10 | Verfahren zur beschichtung der oberfläche eines geschlossenen kühlkanals eines kolbens für einen verbrennungsmotor |
Country Status (6)
Country | Link |
---|---|
US (1) | US10252293B2 (zh) |
EP (1) | EP3307922B1 (zh) |
JP (1) | JP6408722B2 (zh) |
CN (1) | CN107787402B (zh) |
BR (1) | BR112017025644A2 (zh) |
WO (1) | WO2016198618A1 (zh) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017207594A1 (de) * | 2017-05-05 | 2018-11-08 | Federal-Mogul Nürnberg GmbH | Thermische Isolierung eines Stahlkolbens mittels einer Mangan-Phosphat- und einer Polysilazan-Schicht |
DE102017207590A1 (de) * | 2017-05-05 | 2018-11-08 | Federal-Mogul Nürnberg GmbH | Thermische Isolierung des Mittenkegels eines Stahlkolbens |
DE102017207593A1 (de) * | 2017-05-05 | 2018-11-08 | Federal-Mogul Nürnberg GmbH | Thermische Isolierung eines Stahlkolbens mittels einer versiegelten amorphen Phosphat-Schicht |
DE102020208462A1 (de) * | 2020-07-07 | 2022-01-13 | Mahle International Gmbh | Verfahren zum Beschichten eines Kolbens |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20060111665A (ko) * | 2004-01-07 | 2006-10-27 | 가부시키가이샤 고마쓰 세이사쿠쇼 | 내연기관용 피스톤 |
DE102007029668A1 (de) * | 2007-06-27 | 2009-01-08 | Epg (Engineered Nanoproducts Germany) Ag | Ultraharte Kompositschichten auf Metalloberflächen und Verfahren zu ihrer Herstellung |
EP2096290B1 (en) | 2008-02-29 | 2014-06-18 | Caterpillar Motoren GmbH & Co. KG | Engine piston with cooling chamber having a non-stick coating |
DE102008020906A1 (de) | 2008-04-18 | 2009-10-22 | Ltn Nanovation Ag | Schutzbeschichtung für Einrichtungen in Kraftwerken und Industrie |
DE102011107659A1 (de) * | 2011-07-12 | 2013-01-17 | Mahle International Gmbh | Verfahren zur Herstellung eines Kolbens für einen Verbrennungsmotor sowie Kolben für einen Verbrennungsmotor |
DE102012211440A1 (de) * | 2011-10-21 | 2013-04-25 | Mahle International Gmbh | Kolben |
US9169800B2 (en) * | 2011-11-28 | 2015-10-27 | Federal-Mogul Corporation | Piston with anti-carbon deposit coating and method of construction thereof |
DE102012025283A1 (de) | 2012-12-21 | 2014-06-26 | Mahle International Gmbh | Kolben für einen Verbrennungsmotor und Verfahren zu seiner Herstellung |
CN105190000B (zh) * | 2013-03-05 | 2018-11-20 | 费德罗-莫格尔公司 | 带有抗积碳涂料的活塞及其制造方法 |
EP2969256B1 (en) * | 2013-03-15 | 2016-10-26 | Mahle International GmbH | Wearable anti-friction coating for piston assembly |
-
2016
- 2016-06-10 WO PCT/EP2016/063324 patent/WO2016198618A1/de active Application Filing
- 2016-06-10 CN CN201680033189.1A patent/CN107787402B/zh not_active Expired - Fee Related
- 2016-06-10 JP JP2017560696A patent/JP6408722B2/ja not_active Expired - Fee Related
- 2016-06-10 BR BR112017025644-4A patent/BR112017025644A2/pt not_active Application Discontinuation
- 2016-06-10 EP EP16732963.0A patent/EP3307922B1/de not_active Not-in-force
- 2016-06-10 US US15/735,464 patent/US10252293B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
CN107787402A (zh) | 2018-03-09 |
BR112017025644A2 (pt) | 2018-09-11 |
CN107787402B (zh) | 2019-11-19 |
JP6408722B2 (ja) | 2018-10-17 |
JP2018514701A (ja) | 2018-06-07 |
US20180163310A1 (en) | 2018-06-14 |
WO2016198618A1 (de) | 2016-12-15 |
US10252293B2 (en) | 2019-04-09 |
EP3307922A1 (de) | 2018-04-18 |
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