EP3307922B1 - Procédé de revêtement de la surface d'un canal de refroidissement fermé d'un piston pour un moteur à combustion interne - Google Patents

Procédé de revêtement de la surface d'un canal de refroidissement fermé d'un piston pour un moteur à combustion interne Download PDF

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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
Application number
EP16732963.0A
Other languages
German (de)
English (en)
Other versions
EP3307922A1 (fr
Inventor
Ulrich Bischofberger
Stephan Körner
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.)
Mahle International GmbH
Original Assignee
Mahle International GmbH
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 Mahle International GmbH filed Critical Mahle International GmbH
Publication of EP3307922A1 publication Critical patent/EP3307922A1/fr
Application granted granted Critical
Publication of EP3307922B1 publication Critical patent/EP3307922B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Wood Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Lubricants (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (12)

  1. Procédé de revêtement de la surface (24) d'un canal de refroidissement (23) fermé, présentant des perçages d'amenée d'huile ou d'évacuation d'huile (23', 23"), d'un piston (10) pour un moteur à combustion interne avec un agent de revêtement contenant du nitrure de bore hexagonal, caractérisé par les étapes de procédé suivantes :
    a) introduction d'une quantité définie d'un agent de revêtement sous la forme d'une suspension de nitrure de bore hexagonal avec une solution à base d'au moins un liant anorganique thermiquement durcissable et d'au moins un solvant dans le canal de refroidissement (23) ;
    b) distribution de l'agent de revêtement sur la surface (24) du canal de refroidissement (23) par déplacement du piston (10) autour d'au moins deux axes spatiaux ;
    c) séchage de l'agent de revêtement distribué sur la surface (24) du canal de refroidissement (23) au moyen d'un courant d'air laminaire :
    d) durcissement thermique de l'agent de revêtement pour terminer un revêtement (25) adhérant sur la surface (24) du canal de refroidissement (23).
  2. Procédé selon la revendication 1, caractérisé en ce qu'avant l'étape a), la taille de la surface (24) du canal de refroidissement (23) est déterminée.
  3. Procédé selon la revendication 1, caractérisé en ce qu'avant l'étape a), la surface (24) du canal de refroidissement (23) est nettoyée avec un produit de nettoyage.
  4. Procédé selon la revendication 3, caractérisé en ce que le produit de nettoyage est sélectionné dans le groupe comprenant du méthanol, de l'éthanol, de l'acétone, du 1-propanol, du 2-propanol.
  5. Procédé selon la revendication 1, caractérisé en ce que dans l'étape a), au moins un polysiloxane est utilisé en tant que liant.
  6. Procédé selon la revendication 5, caractérisé en ce que de l'éthanol est utilisé en tant que liant.
  7. Procédé selon la revendication 1, caractérisé en ce que du sodium et/ou silicate de potassium est utilisé en tant qu'autre liant.
  8. Procédé selon la revendication 1, caractérisé en ce que dans l'étape a), une quantité de 7 ml de l'agent de revêtement est utilisée pour le revêtement d'une surface (24) du canal de refroidissement (23) de 190 cm2.
  9. Procédé selon la revendication 1, caractérisé en ce que dans l'étape b), le piston (10) est déplacé au moyen d'un mélangeur biaxial.
  10. Procédé selon la revendication 1, caractérisé en ce que dans l'étape c), un courant d'air laminaire avec une vitesse de 1 à 2 mètres par seconde est utilisé.
  11. Procédé selon la revendication 1, caractérisé en ce que dans l'étape c), le séchage est réalisé à température ambiante.
  12. Procédé selon la revendication 1, caractérisé en ce que dans l'étape d), le durcissement thermique est réalisé à une température de 180 °C à 220 °C.
EP16732963.0A 2015-06-12 2016-06-10 Procédé de revêtement de la surface d'un canal de refroidissement fermé d'un piston pour un moteur à combustion interne Not-in-force EP3307922B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015007334 2015-06-12
PCT/EP2016/063324 WO2016198618A1 (fr) 2015-06-12 2016-06-10 Procédé de revêtement de la surface d'un canal de refroidissement fermé d'un piston pour un moteur à combustion interne et piston pouvant être fabriqué au moyen de ce procédé

Publications (2)

Publication Number Publication Date
EP3307922A1 EP3307922A1 (fr) 2018-04-18
EP3307922B1 true EP3307922B1 (fr) 2019-05-22

Family

ID=56289464

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16732963.0A Not-in-force EP3307922B1 (fr) 2015-06-12 2016-06-10 Procédé de revêtement de la surface d'un canal de refroidissement fermé d'un piston pour un moteur à combustion interne

Country Status (6)

Country Link
US (1) US10252293B2 (fr)
EP (1) EP3307922B1 (fr)
JP (1) JP6408722B2 (fr)
CN (1) CN107787402B (fr)
BR (1) BR112017025644A2 (fr)
WO (1) WO2016198618A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017207593A1 (de) * 2017-05-05 2018-11-08 Federal-Mogul Nürnberg GmbH Thermische Isolierung eines Stahlkolbens mittels einer versiegelten amorphen Phosphat-Schicht
DE102017207590A1 (de) * 2017-05-05 2018-11-08 Federal-Mogul Nürnberg GmbH Thermische Isolierung des Mittenkegels eines Stahlkolbens
DE102017207594A1 (de) * 2017-05-05 2018-11-08 Federal-Mogul Nürnberg GmbH Thermische Isolierung eines Stahlkolbens mittels einer Mangan-Phosphat- und einer Polysilazan-Schicht
DE102020208462A1 (de) * 2020-07-07 2022-01-13 Mahle International Gmbh Verfahren zum Beschichten eines Kolbens

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112004002568T5 (de) * 2004-01-07 2006-11-30 Komatsu Ltd. Kolben für einen Verbrennungsmotor
DE102007029668A1 (de) * 2007-06-27 2009-01-08 Epg (Engineered Nanoproducts Germany) Ag Ultraharte Kompositschichten auf Metalloberflächen und Verfahren zu ihrer Herstellung
EP2096290B1 (fr) 2008-02-29 2014-06-18 Caterpillar Motoren GmbH & Co. KG Piston de moteur à combustion interne pourvu d'un chambre de refroidissement avec un revêtement anti-adhésif
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
KR20150121239A (ko) * 2013-03-05 2015-10-28 페더럴-모걸 코오포레이숀 카본 디포짓 방지 코팅을 지닌 피스톤 및 그 구성 방법
EP2969256B1 (fr) * 2013-03-15 2016-10-26 Mahle International GmbH Revêtement antifriction d'usure pour ensemble piston

Non-Patent Citations (1)

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Title
None *

Also Published As

Publication number Publication date
WO2016198618A1 (fr) 2016-12-15
US10252293B2 (en) 2019-04-09
US20180163310A1 (en) 2018-06-14
CN107787402A (zh) 2018-03-09
CN107787402B (zh) 2019-11-19
BR112017025644A2 (pt) 2018-09-11
JP2018514701A (ja) 2018-06-07
EP3307922A1 (fr) 2018-04-18
JP6408722B2 (ja) 2018-10-17

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