WO2018197338A1 - Piston pour moteur à combustion interne - Google Patents

Piston pour moteur à combustion interne Download PDF

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Publication number
WO2018197338A1
WO2018197338A1 PCT/EP2018/060086 EP2018060086W WO2018197338A1 WO 2018197338 A1 WO2018197338 A1 WO 2018197338A1 EP 2018060086 W EP2018060086 W EP 2018060086W WO 2018197338 A1 WO2018197338 A1 WO 2018197338A1
Authority
WO
WIPO (PCT)
Prior art keywords
weight
piston according
barrier coating
thermal barrier
inorganic
Prior art date
Application number
PCT/EP2018/060086
Other languages
German (de)
English (en)
Inventor
Ulrich Bischofberger
Alois LECKER
Reinhard Rose
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 WO2018197338A1 publication Critical patent/WO2018197338A1/fr

Links

Classifications

    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • 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 
    • F02F3/10—Pistons  having surface coverings
    • F02F3/12—Pistons  having surface coverings on piston heads
    • 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 
    • F02F3/10—Pistons  having surface coverings
    • F02F3/12—Pistons  having surface coverings on piston heads
    • F02F3/14—Pistons  having surface coverings on piston heads within combustion chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2251/00—Material properties
    • F05C2251/04—Thermal properties
    • F05C2251/048—Heat transfer

Definitions

  • the invention relates to a piston for an internal combustion engine and an internal combustion engine with such a piston.
  • DE 195 42 944 A1 discloses an internal combustion engine with combustion and in particular heat-stressed parts. Furthermore, a method of applying a porous thermal barrier coating to these parts will be described.
  • the heat-insulating layer formed from externally interconnected grains and / or fibers is at least partially made of a heat-resistant, temperature-shock resistant and abrasion-resistant insulating material.
  • the thermal barrier coating has a low heat input on. This means that also the thermal conductivity, the heat capacity and the density of said thermal barrier coating are low. In this way it is achieved that the thermal barrier coating receives only a relatively small amount of heat and delivers to the actual piston material of the piston.
  • the basic idea of the invention is accordingly to provide a thermal barrier coating and a cover layer disposed on the thermal barrier coating on the surface of a piston for an internal combustion engine.
  • the heat-insulating layer in combination with the cover layer serves to prevent penetration of heat or even heat from the combustion chamber of the internal combustion engine into the material of the piston as far as possible.
  • thermal barrier coating with a low heat input, which is usually accompanied by low thermal conductivity, low heat capacity and low density.
  • the thermal barrier coating of an inventive In accordance with the piston an inorganic-oxidic matrix material, in which a plurality of hollow balls is embedded.
  • the cover layer arranged on the thermal barrier coating according to the invention serves to reflect heat radiation generated in the combustion chamber of the internal combustion engine as far as possible, ie to throw it back into the combustion chamber, so that as little heat as possible hits the thermal barrier coating in the first place.
  • the cover layer also comprises an inorganic-oxidic matrix material in which a plurality of platelet-like particles, in particular of mica, are embedded.
  • the said particles as the main constituent of the cover layer follow the principle of action of tiny mirrors which have the desired reflection properties.
  • an inorganic-oxidic matrix material has a low thermal conductivity, which also has an advantageous effect on the thermal insulation to be achieved by means of the thermal barrier coating.
  • the platelets can also cause a mechanical stabilization of the cover layer, so that in particular the formation of cracks is avoided.
  • An inventive piston for an internal combustion engine comprises a base body on which a thermal barrier coating is applied.
  • the thermal barrier coating comprises an inorganic-oxidic matrix material in which a plurality of hollow spheres is embedded.
  • a cover layer is applied on the thermal barrier coating.
  • the cover layer also comprises an inorganic oxide matrix material in which a plurality of platelet-like particles is embedded.
  • the inorganic-oxidic matrix material comprises an inorganic metal-oxide, preferably an inorganic silica-based or polyphosphate-based, matrix material.
  • the inorganic-oxidic matrix material is formed by: silicone resin, water glass, sodium silicate, potassium silicate, sodium potassium silicate, alumino silicate, soda-lime glass, silanes, or siloxanes.
  • the material of the hollow spheres may be a glass or comprise a glass.
  • the material of the hollow spheres may be a metal oxide or comprise a metal oxide.
  • the hollow spheres SiO 2 are formed from at least one of the following materials: SiO 2 , ZnO 2 , CaO, Al 2 O 3 , Cr 2 O 3 , alumino silicate, MgO, BaO, TiO 2 , ZrO 2 , MnO, Fe 2 O 3 , PbO, B 2 O 3 .
  • the platelet-like particles preferably consist of mica, stainless steel, glass or aluminum.
  • the platelet-like particles are at least partially formed as micro-platelets, which have a measured along a longitudinal direction of the particle platelet length of at most 40 ⁇ , more preferably from 10 to 40 ⁇ .
  • the proportion of hollow spheres in the thermal barrier coating is 40-80% by volume. Particularly preferably, the proportion is about 50 Vol .-%.
  • the weight of the SiO 2 hollow spheres in the heat-insulating layer is between 15% by weight and 20% by weight, preferably substantially 18% by weight, most preferably approximately 18.75% by weight, the weight of the inorganic-oxidic matrix material in the thermal barrier coating. This measure also leads to a reduction of the thermal conductivity.
  • the thermal barrier coating comprises a plurality of platelet-like particles, preferably of mica or glass or stainless steel or aluminum, whose weight is between 20 wt .-% and 30 wt .-%, of the weight of the inorganic-oxidic matrix material in the thermal barrier coating is.
  • a value of essentially 25% by weight is found to be particularly advantageous for the weight of the particles.
  • At least 70%, preferably at least 90%, most preferably at least 95%, of the platelet-like particles are each arranged substantially planar to a surface of the base body.
  • at least one hollow sphere has a diameter d K of between 30 ⁇ m and 55 ⁇ m. This is especially preferred for all hollow spheres present in the thermal barrier coating. This diameter range ensures a particularly low heat capacity of the thermal barrier coating.
  • this contains a plurality of metal pigments arranged in the inorganic-oxidic matrix material, which are preferably designed as stainless-steel pigments. Said metal pigments counteract the formation of cracks in the thermal barrier coating to a considerable extent.
  • the weight of the metal pigments in the thermal barrier coating is between 2% by weight and 3% by weight of the weight of the inorganic-oxidic matrix material in the thermal barrier coating. Particularly preferred is a value of substantially 2.5% by weight.
  • the thermal barrier coating has a layer thickness between 150 ⁇ and 400 ⁇ .
  • a thermal barrier coating with a layer thickness in this layer thickness interval is technically particularly easy to produce.
  • the heat-insulating layer can be provided with a heat penetration number of at most 0.15 J / K m s, preferably of at most 0.03 J / K m s. In this way it is ensured that only a small amount of heat can penetrate the thermal barrier coating and penetrate into the actual piston material.
  • the cover layer may comprise a plurality of metal pigments arranged in the inorganic-oxidic matrix material, which are preferably formed as pigments from stainless steel.
  • metal pigments By means of such Metal pigments, the thermal and physical flexibility of the top layer is significantly improved.
  • the weight of the metal pigments in the cover layer is between 2% by weight and 3% by weight, preferably substantially 2.5% by weight, of the weight of the silicone resin in the cover layer.
  • the cover layer contains a plurality of platelet-like particles, preferably of mica or glass or stainless steel or aluminum, whose weight is between 35% by weight and 40% by weight, preferably substantially 37.5% by weight. , the weight of the silicone resin in the topcoat is. Said platelet-like particles counteract the formation of cracks in the cover layer - caused by high thermal loads.
  • the cover layer may have a layer thickness d D s between 20 ⁇ and 100 ⁇ own.
  • a layer thickness range is accompanied by particularly good reflection properties of the cover layer.
  • an adhesion-promoting layer between the thermal barrier coating and the main body, which contains the inorganic-oxidic matrix material in which a plurality of flake-like particles are embedded.
  • the flake-like particles may consist of a metal.
  • the metal is aluminum or titanium.
  • at least one flake-like particle may have a particle diameter D A i between 13 ⁇ m and 19 ⁇ m. This applies particularly preferably to all particles present in the adhesion-promoting layer.
  • the adhesion-promoting layer preferably contains an adhesion-increasing binder. This measure additionally improves the adhesion properties of the adhesion-promoting layer.
  • the adhesion-promoting layer contains a plurality of platelet-like particles, preferably of mica or stainless steel or glass or aluminum, whose weight is between 20% by weight and 30% by weight, preferably substantially 25% by weight Weight of the inorganic-oxide matrix material in the adhesion-promoting layer is.
  • the platelet-like particles improve the crack resistance of the primer layer.
  • the heat-insulating layer and / or the cover layer contains in each case preferably between 15% by volume and 45% by volume, preferably approximately 40% by volume or 17.5% by volume of xylene.
  • the formulation of the optional adhesion-promoting layer may contain about 40% by volume or about 17.5% by volume of xylene. In this case, the xylene promotes a better curability of the formulation as a solvent and thus easier training of the thermal barrier coating.
  • the invention further relates to an internal combustion engine with cylinders, in each of which a previously presented piston is adjustably arranged.
  • the advantages of the above-explained piston are therefore also transferred to the internal combustion engine according to the invention.
  • FIG. 1 shows a schematic partial representation of the structure of a piston 1 according to the invention.
  • This comprises a basic body 2 which is only roughly illustrated in FIG. 1.
  • a porous thermal barrier coating 3 is applied to the base body 2 and comprises an inorganic-oxidic matrix material indicated only schematically in FIG.
  • the inorganic oxide matrix material may in particular be an inorganic metal oxide, preferably an inorganic silicon dioxide-based or polyphosphate-based matrix material.
  • said matrix material is a silicone resin 10.
  • Possible alternative materials are: silicone resin, water glass, sodium silicate, potassium silicate, sodium potassium silicate, alumino silicate, soda lime glass, silanes, or siloxanes.
  • the thermal barrier coating 3 may have a layer thickness d W Ds between 150 ⁇ and 400 ⁇ .
  • a plurality of SiO 2 hollow spheres 1 1 are embedded, which are also indicated in Figure 1 only schematically.
  • the SiO 2 hollow spheres 1 1 each have a diameter between 30 ⁇ and 55 ⁇ and are thus formed as micro-hollow spheres.
  • SiO 2 - can be used as a material for the hollow spheres, another metal oxide.
  • glass as a material for the hollow spheres is conceivable. In particular, the following materials can be used:
  • a cover layer 4 which also comprises an inorganic-oxidic matrix material.
  • the inorganic-oxidic matrix material may in particular be an inorganic metal-oxide, preferably an inorganic silicon dioxide-based or polyphosphate-based.
  • the matrix material is a silicone resin 12.
  • a plurality of platelet-like particles 13 made of mica are embedded. Instead of mica can be used as a particle material and stainless steel, glass or aluminum.
  • the platelet-like particles are formed as micro-platelets, which are measured along a longitudinal direction of the particle platelet length of 10 to 40 ⁇ .
  • the proportion of SiO 2 hollow spheres in the thermal barrier coating is 40-80 vol%, preferably about 50 vol%.
  • the weight of the SiO 2 hollow spheres 1 1 in the thermal barrier coating 3 is between 15 wt .-% and 20 wt .-%, preferably substantially 18 wt .-%, most preferably about 18.75 wt .-% of the weight of in the thermal barrier coating 3 existing silicone resin 10th
  • the thermal barrier coating 3 may comprise a plurality of particles 13 of mica, the weight of which is between 20% by weight and 30% by weight of the weight of the silicone resin 10 present in the thermal barrier coating 3. Particularly preferred is a value of substantially 25 wt .-%. Instead of mica comes as an alternative material and glass, stainless steel and aluminum into consideration.
  • At least 70% of the platelet-like particles 13 made of mica are each arranged substantially planar to a surface 6 of the base body 2.
  • a value of at least 90% is preferred, a value of at least 95% being particularly preferred.
  • the thermal barrier coating 3 may comprise a plurality of metal pigments 14 disposed in the silicone resin 10.
  • the metal pigments 14 are stainless steel pigments.
  • the weight of the metal pigments 14 in the thermal barrier coating 3 may be between 2% by weight and 3% by weight of the weight of the silicone resin 10 in the thermal barrier coating 3. Particularly preferred is a value of substantially 2.5% by weight.
  • the thermal barrier coating 3 can have a heat input of at most 0.15
  • the cover layer 4 has a layer thickness d D s between 20 ⁇ and 100 ⁇ .
  • the cover layer 4 also comprises a plurality of metal pigments 15 arranged in the silicone resin 12.
  • the metal pigments are preferably stainless-steel pigments.
  • the weight of the metal pigments 15 in the cover layer 4 is between 2% by weight and 3% by weight of the silicone resin 12 in the cover layer 4. A value of essentially 2.5% by weight proves to be particularly advantageous. ,
  • the cover layer 4 may contain a plurality of platelet-like particles 16 - preferably made of mica, glass, stainless steel or aluminum - whose weight is between 35 wt .-% and 40 wt .-% of the weight of the silicone resin 12 in the cover layer 4. Preference is given to a value of essentially 37.5% by weight.
  • an adhesion-promoting layer 5 may be formed, which also contains silicone resin 17.
  • silicone resin 17 of the adhesion-promoting layer 5 a plurality of flake-like particles 18 of aluminum may be embedded in a matrix-like manner.
  • aluminum comes as a material and other suitable metal, such as titanium, into consideration.
  • the flake-like particles 18 preferably have a particle diameter Da between 13 ⁇ and 19 ⁇ . In this case, the maximum possible distance between two arbitrary points on the surface of an Al particle 18 is defined as the diameter D A i.
  • the adhesion-promoting layer 5 may contain an adhesion-increasing binder not further illustrated in FIG.
  • the adhesion-promoting layer 5 can be dispensed with.
  • the adhesion-promoting layer 5 also contains a multiplicity of platelet-like particles 19 of mica, the weight of which is between 20% by weight and 30% by weight, of the weight of the silicone resin 17 in the adhesion-promoting layer. simply 5. Particularly advantageous is a value of substantially 25 wt .-%. Instead of mica comes as a material and stainless steel, glass or aluminum into consideration.
  • the formulations of the thermal barrier coating 3 and the cover layer 4 each contain, preferably between 15% vol .-% and 45 vol .-% xylene. Particularly preferred are a value of about 40 vol .-% for the thermal barrier coating 3 and a value of about 17.5 vol .-% for the cover layer 4.
  • the adhesion-promoting layer 5 may contain xylene. A value of about 40% by volume or about 17.5% by volume of xylene proves to be particularly advantageous for the adhesion-promoting layer 5. In this case, the xylene promotes improved curability of the formulation as a solvent and thus easier formation of the thermal barrier coating, but is preferably contained in the cured layer only in small quantities or not at all.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

L'invention concerne un piston (1) pour un moteur à combustion interne. Le piston comprend -un corps de base (2), -une barrière thermique (3) poreuse qui est appliquée sur le corps de base (2) et qui comporte un matériau matriciel inorgano-oxydique dans lequel sont encapsulées une pluralité de sphères creuses (11), -une couche de recouvrement (4) qui est agencée sur la barrière thermique (3) et qui comporte un matériau matriciel inorgano-oxydique (12) dans lequel sont encapsulées une pluralité de particules (13) de type plaquettes.
PCT/EP2018/060086 2017-04-28 2018-04-19 Piston pour moteur à combustion interne WO2018197338A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017207236.9A DE102017207236A1 (de) 2017-04-28 2017-04-28 Kolben für eine Brennkraftmaschine
DE102017207236.9 2017-04-28

Publications (1)

Publication Number Publication Date
WO2018197338A1 true WO2018197338A1 (fr) 2018-11-01

Family

ID=62044710

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/060086 WO2018197338A1 (fr) 2017-04-28 2018-04-19 Piston pour moteur à combustion interne

Country Status (2)

Country Link
DE (1) DE102017207236A1 (fr)
WO (1) WO2018197338A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020208366A1 (de) 2020-07-03 2022-01-05 Mahle International Gmbh Kolben für eine Brennkraftmaschine sowie Brennkraftmaschine
DE102020208462A1 (de) 2020-07-07 2022-01-13 Mahle International Gmbh Verfahren zum Beschichten eines Kolbens

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4553472A (en) * 1982-08-20 1985-11-19 Robert Munro Pistons and method for their manufacture
US4852542A (en) 1987-10-23 1989-08-01 Adiabatics, Inc. Thin thermal barrier coating for engines
DE19542944A1 (de) 1995-11-17 1997-05-22 Daimler Benz Ag Brennkraftmaschine und Verfahren zum Aufbringen einer Wärmedämmschicht
DE102012025283A1 (de) 2012-12-21 2014-06-26 Mahle International Gmbh Kolben für einen Verbrennungsmotor und Verfahren zu seiner Herstellung
US20150204269A1 (en) * 2012-08-10 2015-07-23 Aisin Seiki Kabushiki Kaisha Engine and piston
WO2016163244A1 (fr) * 2015-04-08 2016-10-13 アイシン精機株式会社 Pièce de machine de véhicule et piston
EP3272905A1 (fr) * 2015-04-08 2018-01-24 Aisin Seiki Kabushiki Kaisha Pièce de machine de véhicule et piston

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19629399B4 (de) * 1996-07-20 2008-10-16 Mahle Gmbh Kolben für Verbrennungsmotoren mit einem Kolbenboden oder Kolbenoberteil
JPH11116832A (ja) * 1997-08-14 1999-04-27 Kanegafuchi Chem Ind Co Ltd 硬化性組成物
DE102005042474A1 (de) * 2005-09-07 2007-03-08 Ks Aluminium-Technologie Ag Beschichtung eines thermisch und erosiv belasteten Funktionsbauteil, sowie ein Trennmittel und ein Verfahren zur Herstellung der Beschichtung
EP2818677A4 (fr) * 2012-02-22 2015-11-25 Ngk Insulators Ltd Structure de chambre de combustion de moteur et structure de paroi intérieure de circuit fluidique
WO2013129430A1 (fr) * 2012-02-27 2013-09-06 日本碍子株式会社 Élément thermo-isolant et structure de chambre de combustion de moteur
JP2014040820A (ja) * 2012-08-23 2014-03-06 Mazda Motor Corp エンジン燃焼室に臨む部材の断熱構造体及びその製造方法
WO2015016122A1 (fr) * 2013-08-01 2015-02-05 日立オートモティブシステムズ株式会社 Méthode de fabrication d'un piston pour moteur à combustion interne, et piston pour moteur à combustion interne
JP6321934B2 (ja) * 2013-09-30 2018-05-09 マツダ株式会社 エンジン燃焼室に臨む部材表面の断熱層の製造方法
DE102014201337A1 (de) * 2014-01-24 2015-07-30 Volkswagen Aktiengesellschaft Kolben für eine Kolbenmaschine
JP6281551B2 (ja) * 2015-09-30 2018-02-21 マツダ株式会社 エンジン燃焼室の断熱構造

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4553472A (en) * 1982-08-20 1985-11-19 Robert Munro Pistons and method for their manufacture
US4852542A (en) 1987-10-23 1989-08-01 Adiabatics, Inc. Thin thermal barrier coating for engines
DE19542944A1 (de) 1995-11-17 1997-05-22 Daimler Benz Ag Brennkraftmaschine und Verfahren zum Aufbringen einer Wärmedämmschicht
US20150204269A1 (en) * 2012-08-10 2015-07-23 Aisin Seiki Kabushiki Kaisha Engine and piston
DE102012025283A1 (de) 2012-12-21 2014-06-26 Mahle International Gmbh Kolben für einen Verbrennungsmotor und Verfahren zu seiner Herstellung
WO2016163244A1 (fr) * 2015-04-08 2016-10-13 アイシン精機株式会社 Pièce de machine de véhicule et piston
EP3272905A1 (fr) * 2015-04-08 2018-01-24 Aisin Seiki Kabushiki Kaisha Pièce de machine de véhicule et piston

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