EP3717680A1 - Schichtstapel zur anordnung in einem brennraum einer verbrennungsmaschine, insbesondere eines kolbens, sowie ein verfahren zu dessen herstellung - Google Patents
Schichtstapel zur anordnung in einem brennraum einer verbrennungsmaschine, insbesondere eines kolbens, sowie ein verfahren zu dessen herstellungInfo
- Publication number
- EP3717680A1 EP3717680A1 EP18812124.8A EP18812124A EP3717680A1 EP 3717680 A1 EP3717680 A1 EP 3717680A1 EP 18812124 A EP18812124 A EP 18812124A EP 3717680 A1 EP3717680 A1 EP 3717680A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- piston
- base layer
- layer stack
- stack
- 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.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/026—Anodisation with spark discharge
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/024—Anodisation under pulsed or modulated current or potential
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
- C25D11/08—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing inorganic acids
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/18—After-treatment, e.g. pore-sealing
- C25D11/24—Chemical after-treatment
- C25D11/246—Chemical after-treatment for sealing layers
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/26—Anodisation of refractory metals or alloys based thereon
-
- 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
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- 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
- Layer stack for arrangement in a combustion chamber of an internal combustion engine, in particular a piston, and a method for its production
- the invention relates to a layer stack for arrangement in a combustion chamber of a
- Combustion engine in particular a piston, and a method for its
- Piston engines (also referred to as reciprocating piston engine) comprise a stationary component, namely a cylinder, and a piston arranged movably in the cylinder.
- the piston is essentially composed of a piston skirt, which is slidably mounted along the cylinder wall, and a piston crown.
- the piston crown together with the cylinder and the cylinder head, encloses a closed combustion chamber whose volume changes as a result of the movement of the piston in accordance with the working stroke of the engine.
- the respective position of the piston in the housing thus determines the size of the combustion chamber.
- a sealing of the combustion chamber relative to the crankcase takes place via sealing elements provided on the piston skirt of the piston.
- the materials used for such pistons are steels and aluminum-based light alloys.
- the most widely used piston engines today are gasoline and diesel engines, which are used in particular in motor vehicles.
- the piston must be at
- Layer stack comprises a first layer of heat-insulating material and a second layer of a thermally conductive material.
- WO 2015/045 286 proposes a heat-insulating layer which, in addition to hollow particles of an inorganic oxide and a filler material, also has a vitreous material, wherein the vitreous material surrounds and binds the abovementioned constituents.
- the high roughness has a negative effect on the combustion process, so that in practice it is arranged only in regions, that is to say not in particular in the trough of a piston.
- PEO plasma-electrolytic oxidation
- a first aspect of the invention relates to a layer stack which is arranged on a surface adjacent to a combustion chamber of an internal combustion engine.
- the layer stack comprises a porous base layer of an Al 2 O 3 ceramic, which is arranged directly or indirectly on the surface, and one on the combustion chamber side facing the
- both the base layer and the sealing layer have a thermal conductivity L of not more than 5 W / mK.
- the layer system according to the invention has an additional due to the two-layeredness
- the thermal conductivity is especially in a working range of 50 to 800 ° C,
- the non-porous sealing layer has a low roughness, which extends the application range of the layer stack according to the invention as an insulating layer to the entire combustion chamber of an internal combustion engine, in particular to the entire piston surface.
- a recess of the trough of a piston is no longer necessary or desirable, but the entire thermal potential of the coating is utilized.
- the porosity of the base layer is in particular due to the production.
- the base layer is preferably produced by means of plasma-electrolytic oxidation.
- the base layer with the method known in WO 2015/090 267 on the surface applied. The cited publication is hereby incorporated by reference.
- a porous base layer is to be understood as meaning in particular a ceramic layer which has at least mesopores (average diameter 2-50 nm), preferably macropores, ie pores having an average diameter of> 50 nm.
- Both layers have a very similar to each other, very low thermal conductivity. This is significantly below the thermal conductivity of the substrate material, in particular in the case of the base layer in accordance with its ceramic character.
- the substrate material is preferably a light metal alloy, in particular an Ai light metal alloy. Due to the smaller heat transfer coefficient and the lower
- Combustion allows higher wall temperatures, so that the provided with the insulating or protective layer surface over the adjacent medium, such as hot gas, is thermally insulated.
- Sealing layer not more than 2, especially not more than 1 W / mK. Particularly preferred is a thermal conductivity A 30- I OO of the base layer of less than 0.9 W / mK. These values optimize the above-described influence of the layer on the application in the combustion chamber.
- the heat capacity of the base layer deviates from that of the sealing layer by not more than 50% relative to the base layer, and optionally the base layer and / or the base layer
- Sealant layer have a volumetric heat capacity p of not more than 5 MJ / m 3 K, in particular not more than 2 MJ / m 3 K.
- Such layers are optimized in particular for use as an insulating layer in a diesel engine. This could be at least 2% reduced at full surface coating of a Dieselkobens
- the base layer comprises a mixed ceramic based on Al 2 0 3 (ie not less than 50% by volume, in particular not less than 75% by volume) with an oxide of the IV subgroup, in particular Zr and / or Ti, or consists of such.
- a mixed ceramic based on Al 2 0 3 ie not less than 50% by volume, in particular not less than 75% by volume
- an oxide of the IV subgroup in particular Zr and / or Ti, or consists of such.
- the sealing layer consists of more than 60 vol .-% of a silicate ceramic. In other words, it is based on a silicate or a silicon oxide ceramic.
- heat-insulating particles in particular Zr0 2 and / or Ti0 2 , to add. It has proven to be advantageous to additionally add particles with nanocrystalline grain size or as disperse distributed spherical conglomerates in high concentration in the preparation process of the silicate, wherein the particles have an average diameter of 25 pm.
- the detailed micro and / or macrostructure of Ti0 2 - or Zr0 2 -Partikei itself has a further additional influence on the thermal insulation.
- spherical conglomerates of fine powder particles, in particular with nanocrystalline microstructures exhibit a lower heat conduction and are therefore preferably included in the layer according to the invention.
- Non-globulitic particles which are oriented parallel to the surface additionally increase the thermal insulation due to the anisotropy of the microstructure and are preferably additionally or alternatively contained in the layer.
- the sealing layer is applied by means of a sol-gel method, since, as a result of the production, in particular in conjunction with silicates, fine, smooth surfaces of the layers can be produced.
- the layer stack according to the invention has a total layer thickness (d) of 130 to 350 pm, in particular in the range of 170 to 230 pm.
- the best results were achieved with a production-measuring tolerance of 200 pm thick layer. It is always the goal, as strong as possible heat-insulating (ie, as thick as possible) to deposit sturdy, yet temperature change resistant (ie as thin as possible) layer.
- the total layer thickness is composed in particular of a 70 to 200 pm thick base layer and / or a 30 to 100 pm thick sealing layer. In the sol-gel process, essentially layers up to 80 ⁇ m thick are deposited.
- the properties of the base layer determine the properties of the insulation layer, so that this contributes to the greatest extent to the total layer thickness.
- Another aspect of the invention relates to a piston for an internal combustion engine
- the piston according to the invention is characterized in particular by a light metal alloy, on whose surface, in particular in the region of a piston crown, at least in regions an inventive layer stack is arranged in one of the embodiments described.
- the layer stack is preferably arranged on the entire surface, in particular in the region of a depression of the piston crown.
- Efficiency of the internal combustion engine is particularly increased by the fact that less heat is removed from the combustion chamber or the cylinder chamber.
- higher temperatures prevail than are known from the prior art. Higher temperatures in turn lead to a higher efficiency.
- a temperature increase in the combustion chamber has a positive effect on the exhaust gas treatment, since the exhaust gases also have a higher temperature and thus lead to an accelerated heating of the catalysts.
- the layer stack according to the invention provides on the piston crown for insulation and / or corrosion protection of the piston surface or of the piston.
- a piston according to the invention is advantageously used in piston engines.
- Piston machines are fluid-energy machines in which a displacer defines a periodically changing working space by means of its movement.
- the displacer is a piston, which may for example have a cylindrical shape.
- the reciprocating engine is understood as meaning both a rotary piston engine, which for example has a disk piston, and a reciprocating piston engine, in particular a cylindrical piston.
- the region of the piston which faces the combustion chamber and thus is in contact with the fluid is referred to in the present invention as the piston head.
- this piston crown is a top side with a round shape, which is cylindrical circumferential side wall, the piston skirt, is arranged.
- the piston head in turn can have many forms. Thus, both planar and concave or convex curved shapes of the piston crown are possible in the present invention.
- the piston head may have depressions and elevations, for example in the form of lugs, which are embedded in and / or protrude from the piston head.
- the piston described in the present invention, in particular piston crowns are at least partially made of a light metal alloy or a steel, wherein
- Light metal alloys are preferred as the piston material. Under light alloy are basically all conceivable light metal alloys to understand. However, aluminum alloys, in particular aluminum-silicon alloys with varying aluminum contents up to hypereutectic concentrations, are preferred in the present invention.
- Another aspect of the invention relates to a process for the preparation of a
- the layer stack comprises at least two layers, wherein a first layer is a base layer which is produced by means of a plasma electrolytic process, wherein optionally the electrolyte as a suspension additionally comprises ZrO 2 particles or TiO 2 particles, and a second layer comprises one the base layer disposed sealing layer which is produced by means of a sol-gel process.
- a method for producing a layer stack for thermal insulation of components, in particular of pistons and other gas-conducting components of a motor is provided, wherein the layer stack comprises at least two layers.
- a base layer by means of a
- the electrolyte as a suspension additionally comprises ZrO 2 particles or TiO 2 particles, and a sealing layer is produced by means of a sol-gel process.
- the proposed solution is thus the production of a 2-layer coating, the base layer being characterized by both an extremely low thermal conductivity and a large roughness and the sealing layer expands and simultaneously seals the base layer, thus providing a smooth seal of the surface to reach.
- the invention combines two modified processes, reduces their respective disadvantages and extends the functionality of thermal insulation with cost-attractive effort.
- the rough roughness of the first layer allows a good interlocking of both layers with each other.
- the two processes can be used optimally in terms of time and function and thus a cost-effective durability and very good
- the layer stack thus obtained also has the advantage of a contact transition or resistance, in addition to the Reduction of heat conduction also minimizes the transmission of radiation by reflection.
- One application of a layer produced in this way is in all drives, in particular in internal combustion engines, in which high-temperature loads
- Base layer is applied in a thickness of 150 - 260 pm and the sealing layer is applied in a thickness of 30 - 80 pm.
- the resulting total thickness of the layer stack is not greater than 250 pm. It has also been shown in detailed simulations that the optimal thermal barrier coating for a reduced consumption
- the base layer 2 is a porous AI 3 0 -Mischoxidkeramik or a porous AI 2 0 3 -Zr02-mixed oxide or a porous Al 2 0 3 -Ti0 2 - have mixed oxide, which in each case additionally embedded particles , is.
- This layer is therefore characterized by an extremely low thermal conductivity, so that a particularly good thermal insulation is achieved.
- this layer thus has a high roughness, so that the sealing layer can be anchored particularly well here.
- As material for the particles with relatively low thermal conductivity are preferably Zr0 2 , Y-stabilized zirconia (Zr (Y) 0 2 ), alumina (Al 2 0 3 ), spinel (Al 2 0 3 / Mg0), mullite (Al 2 0 3 / Si0 2 ), zirconium alumina (Al 2 0 3 / Zr0 2 ), titanium oxide (Ti0 2 ), silicon oxide (Si0 2 ), alkali and alkaline earth silicate (ASi0 4 ) and mixed ceramics with essential constituents of said oxides into consideration. Even if the thermal conductivity of the introduced particles in their pure bulk state is not lower than that of the matrix, the thermal conductivity of both
- the composite layer of the protective layer should be lower overall since the particles introduced act as impurities for the propagation of the crystal oscillations (phonons).
- the concretization "with relatively low thermal conductivity" according to the invention is not limited exclusively to an actual material property of the particles, but should also include a heat conductivity reducing effect within the matrix.
- Sealant layer a Si0 2 base layer or a Zr0 2 base layer or a
- the properties of the first layer can still be used, so that the result is a particularly durable and highly efficient layer stack.
- the applied layer stack is chemically and / or mechanically post-processed, in particular by etching, grinding or honing. This ensures an even better surface.
- Important features of the cover layer are the lowest possible porosity and a smooth surface.
- Electrolyte as a suspension additional particles are not greater than 25 pm. In this way, the layer can be applied very efficiently.
- Sealant layer is additionally provided with heat-insulating particles, these particles are in particular nanocrystalline Zr0 2 or disperse distributed spherical conglomerates in high concentration of Zr0 2 . Particularly preferred are Zr0 2 ,
- Y-stabilized zirconia Zr (Y) O 2
- alumina Al 2 O 3
- spinel Al 2 O 3 / MgO
- mullite Y-stabilized zirconia
- Al 2 0 3 / Si0 2 zirconium alumina (Al 2 0 3 / Zr0 2 ), titanium oxide (Ti0 2 ), silicon oxide (Si0 2 ), alkali and
- Sealant layer are applied to an entire surface of a trough of the piston.
- Figure 1 is a schematic sectional view of a piston in a first
- Figure 2 is a schematic sectional view of a piston in a second
- FIG. 3 schematically shows a detailed detail of a layer stack according to the invention on a piston bottom according to FIG. 2 or 3.
- a preferred embodiment of the piston 10 according to the invention is based on a
- Figure 1 shows a cylindrical piston 10 of a reciprocating motor not shown.
- the piston 10 has a cylindrically shaped piston skirt 14, on which a substantially planar circular piston crown 11 is arranged.
- the piston 10 further has circumferential grooves, which are formed to receive sealing elements, in particular piston rings.
- the piston 10 is preferably made of a light metal alloy 15. Particularly preferred are aluminum alloys, in particular aluminum-silicon alloys. Also usable as piston material are iron compounds, ie steels. In illustrated
- the piston head 11 has a recess 12 in which a layer stack 20 is arranged.
- the diameter d s of the layer stack 20 essentially corresponds to the diameter of the depression 12.
- the diameter d s of the layer stack 20 is in the
- the layer stack 20 is flush with the edge 12 surrounding the recess. A detailed structure of the layer stack 20 is explained in more detail in a detail drawing described below in FIG.
- FIG. 10 The embodiment of a piston 10 shown in FIG.
- FIG. 1 A further preferred embodiment of a piston according to the invention is shown in FIG.
- the piston 10, which is likewise shown in a sectional drawing, is fundamentally constructed in the same way as the piston 10 shown in FIG. 1. It differs from the first embodiment in that the piston head 11 of the cylindrical piston 10 is not planar but has a depression 13.
- a functional layer stack 20 is arranged on the piston head 11 of the second embodiment of the piston 10 shown in FIG. 2.
- the trough 13 may be substantially uniformly (not shown), ie without elevations or as shown in Figure 2 uneven, so for example with increases on the piston head executed.
- the layer stack 20 has, as shown in Figure 1, a smaller diameter than the piston head 11. It thus forms a distance between the layer stack 20 and outer edge of the piston head 1 1. While maintaining a defined edge of the remaining area of the piston head 1 1 is complete from
- the peripheral edge of the piston crown 11 preferably corresponds to less than 10%, in particular less than 5%, preferably less than 2% of the surface of the
- the functional layer stack 20 shown in FIGS. 1 and 2 has, in particular, a heat-insulating function. This is due to the structure of the sketched in Figure 3
- FIG. 3 shows a layer stack 20 according to the invention, which is arranged on a light metal alloy 15.
- the light metal alloy 15 is preferably aluminum alloys, in particular aluminum-silicon alloys.
- a bonding agent 23 can be arranged on this light metal alloy 15.
- This base layer 21 is made of a material having heat insulating properties. It is an Al 2 0 3 -Kermik whose thermal conductivity in particular by adding
- the base layer 21 has a coarse pore structure, ie it has at least mesopores and / or channels.
- the porosity can be achieved through the manufacturing process.
- Particularly suitable for producing the base layer 21 is a plasma electrolytic oxidation.
- An anodization (ANOF) process or a PEO process is a combined process from the fields of plasma technology and electrochemistry, by means of which surfaces of components formed of so-called valve metals can be provided with a base layer 21 of an oxide ceramic ,
- native barrier layer formers such as aluminum, magnesium or titanium come into the selection as valve metals.
- the generation of the base layer 21 can be carried out in particular in aqueous electrolytes.
- the component to be oxidized is poled anodically and immersed in the electrolyte together with a counter electrode (cathode).
- the component initially forms a purely chemically induced passive layer. The growth of this passive layer can be achieved by applying a potential between the anodically poled component and the cathode.
- the oxide layer of the component to be coated will penetrate locally, wherein plasma-chemical solid-state reactions, the spark discharges, are triggered.
- This process does not take place nationwide but at those points where the thickness of the oxide layer and thus the local electrical resistance is lowest. Since the plasma reactions thus always take place at those points of the passive layer which locally have the lowest layer thickness, and there ensure a layer thickness growth, the surface is coated with a very uniform base layer.
- Breaking breakdown voltage the applied electric potential is increased until the desired layer thickness of the base layer is reached.
- the base layer produced by the preferred method is constructed as follows: Adjacent to the substrate is a thin, dense and closed layer, the so-called barrier layer 23, followed by a compact and low-pore layer. This is followed by a porous and less compact layer which, depending on the layer thickness, becomes both more porous and more brittle. In particular, this layer is openly porous and through small channels
- the layer has an interconnecting pore network and / or a non-interconnecting pore network, which is characterized by closed inclusions of air or electrolyte.
- the electrolyte has an electrolyte base, wherein the electrolyte base phosphoric acid (H 3 P0 4 ), potassium hydroxide (KOH), water glass
- zirconium-containing compound (Na 2 Si0 3 ), deionized water or a zirconium-containing compound.
- An electrolyte base in this case is a substance from a variety of substances, the most abundant in g / L in addition to water and urotropin in an electrolyte occurs.
- Zirconium sulfate (ZrS0 4 ) or zirconium tungstate (ZrW0) is particularly suitable as the zirconium-containing compound. This has the advantage that with such an electrolyte composition, a component of, for example, aluminum or titanium or of the corresponding alloys can be plasma-electrochemically oxidized at all. It is advantageous if the electrical power is voltage-controlled, the current is limited or current-controlled, the voltage is limited, or is power-controlled.
- the electrical power is applied at a frequency of 1 Hz to 10 kHz, in particular with a frequency of 1 Hz to 1000 Hz. It is advantageous if the voltage is applied in a range between 150 and 1500 volts, preferably in a range between 210 and 650 volts, and if the current with a current density in a range between 0.001 and 1000 A / dm 2 , preferably in one Range between 0.5 to 15 A / dm 2 is applied. It is conceivable for the applied current and / or the applied voltage to be modulated by a higher-frequency current and / or a higher-frequency voltage.
- the applied current and / or the applied voltage is regulated in the same way, or to have the form of a symmetrical wave, an asymmetric wave, a rectangle or a trapezoid.
- the characteristic shape is provided with a duty cycle and an offset in the range of 0 to 100% and can thus be executed both uni- and bipolar.
- the shape of a wave is advantageous.
- a temperature in the range between 0 ° C and 80 ° C is selected as the process temperature for the PEO. More preferably, the temperature is between 18 ° C and 50 ° C.
- Base layer 21 grows closed on the component and thus a particularly dense and thus secure base layer 21 is formed.
- the component can be protected so safe and long-term stability against external influences, for example, from undesirable oxidation.
- the inventive method component can be produced in mass production with corresponding quality requirements. Furthermore, as well as a practicable
- Production speed can be achieved, which makes a large-scale production possible.
- the electrolyte is carried out as a dispersion, wherein one or more of the following particles are added to the electrolyte: tungsten carbide (WC), ZrO 2 , iron oxide, graphite, molybdenum disulfide (MoS 2 ), Y-stabilized zirconium oxide (Zr ( Y) 0 2 ), alumina (Al 2 O 3 ), spinel (Al 2 O 3 / MgO), mullite (Al 2 O 3 / SiO 2 ), zirconia alumina (Al 2 O 3 / ZrO 2 ), titanium oxide (TiO 2 )
- the electrolyte is applied to an above-mentioned electrolyte base by the addition of said particles.
- the particles may be either globular, ellipsoidal or sparse in the form of flakes or the like.
- the particles can be made of an oxide, a carbide or another material as long as the particles are incorporated as a foreign body into the base layer 21 due to the process or together with the substrate or the electrolyte to another
- zirconium oxide (Zr0 2 ) has proved to be advantageous.
- the sealing layer 24 is arranged.
- the sealing layer 24 is substantially non-porous. It can be applied by means of a sol-gel process.
- the sealing layer is characterized by a smooth surface. This effect can optionally be increased by a downstream smoothing process, such as grinding or honing.
- the sealing layer 24 is preferably thinner than the base layer 21.
- Preferred thicknesses of the sealing layer 24 are in the range between 50 and 100 .mu.m, particularly preferably 80 .mu.m. Due to the high porosity of the base layer 21, a toothing of the two layers results with each other, resulting in a particularly good durability.
- the thermal conductivity and coefficient vary as well as the thermal expansion between the sealing layer 24 and the base layer only very little.
- the layer stack 20 has a heat-insulating, in particular insulating function by the heat-insulating properties of the base layer 21. Because of the very low
- Thermal conductivity l of the protective layer of the layer stack 20 only a very small part of the heat in the combustion chamber is discharged to the surface of the piston crown and from there out of the cylinder chamber. Rather, the heat remains within the combustion chamber and thus remains available for combustion. As a result, a higher efficiency is realized in the combustion chamber than at lower temperatures. At the same time, the exhaust gases discharged from the combustion chamber also have a higher temperature, which ultimately benefits exhaust gas treatment. Negative properties, which entail a high roughness of an insulating layer for the behavior in the combustion chamber, are alleviated by the arrangement of a sealing layer. In addition, a high durability and robustness is achieved by the high degree of toothing of the base layer with the sealing layer.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017221733.2A DE102017221733A1 (de) | 2017-12-01 | 2017-12-01 | Schichtstapel zur Anordnung in einem Brennraum einer Verbrennungsmaschine, insbesondere eines Kolbens, sowie ein Verfahren zu dessen Herstellung |
PCT/EP2018/082871 WO2019106026A1 (de) | 2017-12-01 | 2018-11-28 | Schichtstapel zur anordnung in einem brennraum einer verbrennungsmaschine, insbesondere eines kolbens, sowie ein verfahren zu dessen herstellung |
Publications (1)
Publication Number | Publication Date |
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EP3717680A1 true EP3717680A1 (de) | 2020-10-07 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP18812124.8A Pending EP3717680A1 (de) | 2017-12-01 | 2018-11-28 | Schichtstapel zur anordnung in einem brennraum einer verbrennungsmaschine, insbesondere eines kolbens, sowie ein verfahren zu dessen herstellung |
Country Status (3)
Country | Link |
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EP (1) | EP3717680A1 (de) |
DE (1) | DE102017221733A1 (de) |
WO (1) | WO2019106026A1 (de) |
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RU2763137C1 (ru) * | 2021-02-11 | 2021-12-27 | Акционерное общество "ЗЕНТОРН" | Каталитически активный термобарьерный керамический модификационный слой на поверхности дна поршня, и/или сферы, и/или выпускных каналов головки двс и способ его формирования |
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JP5629463B2 (ja) * | 2007-08-09 | 2014-11-19 | 株式会社豊田中央研究所 | 内燃機関 |
JP5315308B2 (ja) * | 2010-08-25 | 2013-10-16 | トヨタ自動車株式会社 | 内燃機関とその製造方法 |
JP5609497B2 (ja) * | 2010-09-30 | 2014-10-22 | マツダ株式会社 | 断熱構造体 |
JP5607582B2 (ja) * | 2011-07-06 | 2014-10-15 | トヨタ自動車株式会社 | エンジンバルブの製造方法 |
JP5642640B2 (ja) * | 2011-09-12 | 2014-12-17 | トヨタ自動車株式会社 | 内燃機関とその製造方法 |
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 |
US20140262790A1 (en) * | 2013-03-12 | 2014-09-18 | Thomas Levendusky | Colored, corrosion-resistant aluminum alloy substrates and methods for producing same |
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 |
WO2015090267A1 (de) | 2013-12-17 | 2015-06-25 | Meotec GmbH & Co. KG | Verfahren zur erzeugung einer schutzschicht auf einem thermisch belasteten bauteil sowie bauteil mit einer derartigen schutzschicht |
DE102014219819A1 (de) * | 2014-09-30 | 2016-03-31 | Volkswagen Aktiengesellschaft | Verfahren zur thermischen Isolierung eines Brennraums und/oder einer Abgasführung einer Brennkraftmaschine |
DE102014201337A1 (de) | 2014-01-24 | 2015-07-30 | Volkswagen Aktiengesellschaft | Kolben für eine Kolbenmaschine |
JP6046665B2 (ja) * | 2014-06-10 | 2016-12-21 | トヨタ自動車株式会社 | 断熱膜の形成方法および断熱膜 |
JP6217552B2 (ja) * | 2014-07-25 | 2017-10-25 | トヨタ自動車株式会社 | 断熱膜の形成方法 |
JP6170029B2 (ja) * | 2014-11-07 | 2017-07-26 | トヨタ自動車株式会社 | 遮熱膜の形成方法 |
JP6178303B2 (ja) * | 2014-12-26 | 2017-08-09 | トヨタ自動車株式会社 | 内燃機関 |
CN108138328A (zh) * | 2015-09-11 | 2018-06-08 | 惠普发展公司,有限责任合伙企业 | 基于轻金属的多层基板 |
DE102015120288A1 (de) | 2015-11-24 | 2017-02-16 | Meotec GmbH & Co. KG | Verfahren zur Erzeugung einer Oberflächenschicht auf einer Oberfläche eines Bauteils mittels plasmaelektrolytischer Oxidation |
JP6424851B2 (ja) * | 2016-03-01 | 2018-11-21 | トヨタ自動車株式会社 | 内燃機関の燃焼室構造 |
-
2017
- 2017-12-01 DE DE102017221733.2A patent/DE102017221733A1/de active Pending
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2018
- 2018-11-28 EP EP18812124.8A patent/EP3717680A1/de active Pending
- 2018-11-28 WO PCT/EP2018/082871 patent/WO2019106026A1/de unknown
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DE102017221733A1 (de) | 2019-06-06 |
WO2019106026A1 (de) | 2019-06-06 |
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