DE102014018256A1 - Piston for an internal combustion engine - Google Patents
Piston for an internal combustion engine Download PDFInfo
- Publication number
- DE102014018256A1 DE102014018256A1 DE102014018256.8A DE102014018256A DE102014018256A1 DE 102014018256 A1 DE102014018256 A1 DE 102014018256A1 DE 102014018256 A DE102014018256 A DE 102014018256A DE 102014018256 A1 DE102014018256 A1 DE 102014018256A1
- Authority
- DE
- Germany
- Prior art keywords
- piston
- coating
- layer
- piston according
- internal combustion
- 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.)
- Withdrawn
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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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/24—Vacuum evaporation
- C23C14/28—Vacuum evaporation by wave energy or particle radiation
-
- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/0641—Nitrides
- C23C14/0647—Boron nitride
-
- 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
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/34—Nitrides
- C23C16/342—Boron nitride
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- 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
Abstract
Die vorliegende Erfindung betrifft einen Kolben (10, 10', 10'') für einen Verbrennungsmotor, mit einem Kolbenkopf (11) und einem Kolbenschaft (17), wobei der Kolbenkopf (11) einen Kolbenboden (12) aufweist. Erfindungsgemäß ist vorgesehen, dass im Bereich des Kolbenbodens (12) eine Beschichtung (22, 22', 22'') aus kubischem Bornitrid mittels eines PLD-Verfahrens aufgebracht ist.The present invention relates to a piston (10, 10 ', 10 ") for an internal combustion engine, comprising a piston head (11) and a piston shaft (17), the piston head (11) having a piston head (12). According to the invention, it is provided that in the region of the piston head (12) a coating (22, 22 ', 22' ') of cubic boron nitride is applied by means of a PLD process.
Description
Die vorliegende Erfindung betrifft einen Kolben für einen Verbrennungsmotor, mit einem Kolbenkopf und einem Kolbenschaft, wobei der Kolbenkopf einen Kolbenboden aufweist.The present invention relates to a piston for an internal combustion engine, comprising a piston head and a piston skirt, the piston head having a piston crown.
Kolben für moderne Verbrennungsmotoren sind einer hohen thermischen und mechanischen Belastung ausgesetzt. Infolgedessen treten insbesondere im Bereich des Kolbenbodens Plastifizierungs- bzw. Relaxationseffekte auf. Aufgrund dieser Belastung können sich bei fortgesetztem Motorbetrieb zunächst so genannte Zunderkerben und in Fortsetzung dessen Risse im Werkstoffgefüge, bilden. Dies kann im äußersten Fall zum Funktionsausfall des Kolbens führen.Pistons for modern internal combustion engines are exposed to high thermal and mechanical stress. As a result, plastification or relaxation effects occur in particular in the region of the piston crown. Due to this load, so-called scale notches and, in continuation of their cracks in the material structure, may initially form during continued engine operation. In the extreme case, this can lead to a malfunction of the piston.
Die Aufgabe der vorliegenden Erfindung besteht darin, einen gattungsgemäßen Kolben so weiterzuentwickeln, dass der auf thermischer bzw. mechanischer Belastung beruhende Verschleiß im Bereich des Kolbenbodens reduziert wird.The object of the present invention is to further develop a generic piston so that the based on thermal or mechanical stress wear in the region of the piston crown is reduced.
Die Lösung besteht darin, dass im Bereich des Kolbenbodens eine Beschichtung aus kubischem Bornitrid mittels eines PLD-Verfahrens (pulsed-laser-deposition) aufgebracht ist.The solution is that in the region of the piston crown a coating of cubic boron nitride is applied by means of a PLD process (pulsed laser deposition).
Im Zusammenhang mit der vorliegenden Erfindung wird unter einem PLD-Verfahren ein Laserstrahlverdampf-Verfahren verstanden, bei dem der Beschichtungswerkstoff als Target in einer Vakuumkammer mit gepulster Laserstrahlung hoher Intensität (ca. 10 MW/cm2) beleuchtet und dadurch verdampft wird. Dadurch wird ein Plasma gebildet, das unter Verwendung großer Prozessgasdrücke (über 1 mbar) in der Gasphase auf der Oberfläche des zu beschichteten Substrats zu Clustern kondensiert und sich in einer dünnen Schicht auf dem Substrat abscheidet.In the context of the present invention, a PLD method is understood to mean a laser beam evaporation method in which the coating material is illuminated as a target in a vacuum chamber with pulsed laser radiation of high intensity (about 10 MW / cm 2 ) and thereby evaporated. This forms a plasma that condenses into clusters on the surface of the substrate to be coated using large process gas pressures (above 1 mbar) in the gas phase and deposits in a thin layer on the substrate.
Der erfindungsgemäße Kolben zeichnet sich durch eine Beschichtung aus kubischem Bornitrid aus, die einen besonders dichten und geschlossenen Schichtaufbau und eine hohe chemische Stabilität aufweist. Eine Verzunderung des Kolbenwerkstoffs wird somit zuverlässig vermieden. Der dichte Schichtaufbau verhindert das Eindringen von Sauerstoff in den Kolbenwerkstoff während des Motorbetriebs, so dass ein oxidativer Angriff auf den Kolbenwerkstoff ausgeschlossen ist.The piston according to the invention is characterized by a coating of cubic boron nitride, which has a particularly dense and closed layer structure and a high chemical stability. Scaling of the piston material is thus reliably avoided. The dense layer structure prevents the penetration of oxygen into the piston material during engine operation, so that an oxidative attack on the piston material is excluded.
Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.Advantageous developments emerge from the subclaims.
Eine besonders bevorzugte Weiterbildung der Erfindung sieht vor, dass der Kolbenboden eine Verbrennungsmulde aufweist und die Beschichtung auf dem Muldenrand der Verbrennungsmulde aufgebracht ist. Der Muldenrand eines Kolbens mit Verbrennungsmulde ist im Motorbetrieb besonders hoch belastet, so dass in diesem Bereich die Bildung von Muldenrandrissen besonders wirksam verhindert wird.A particularly preferred embodiment of the invention provides that the piston head has a combustion bowl and the coating is applied to the trough edge of the combustion bowl. The trough edge of a piston with combustion bowl is particularly heavily loaded during engine operation, so that the formation of trough edge cracks is particularly effectively prevented in this area.
Die Beschichtung ist bevorzugt als Einzellagenbeschichtung ausgebildet, um ihre Verschleißfestigkeit zu optimieren. Die Schichtdicke der Beschichtung kann zwischen 0,5 μm und 10 μm betragen.The coating is preferably designed as a single-layer coating in order to optimize its wear resistance. The layer thickness of the coating can be between 0.5 μm and 10 μm.
Vorzugsweise ist zwischen dem Kolbenwerkstoff und der Beschichtung eine Haftvermittlerschicht aus einem Werkstoff auf der Basis eines Elements der IV. bis VI. Nebengruppe des Periodensystems der Elemente angeordnet. Besonders bevorzugt basiert der Werkstoff der Haftvermittlerschicht auf dem Element Chrom, wobei insbesondere elementares Chrom oder Chromnitrid zur Anwendung kommen. Die Haftvermittlerschicht kann eine Schichtdicke von 0,5 μm bis 5,0 μm aufweisen und insbesondere als Mehrlagenschichtsystem ausgebildet sein.Preferably, between the piston material and the coating, a bonding agent layer of a material based on an element of IV. To VI. Subgroup of the periodic table of elements arranged. Particularly preferably, the material of the adhesion promoter layer is based on the element chromium, in particular elemental chromium or chromium nitride being used. The adhesion promoter layer may have a layer thickness of 0.5 .mu.m to 5.0 .mu.m and be designed in particular as a multilayer system.
Ein Ausführungsbeispiel der vorliegenden Erfindung wird im Folgenden anhand der beigefügten Zeichnungen näher erläutert. Es zeigen in einer schematischen, nicht maßstabsgetreuen Darstellung:An embodiment of the present invention will be explained in more detail below with reference to the accompanying drawings. In a schematic, not to scale representation:
In den Ausführungsbeispielen ist ein Kolben
Die Kolben
Hierzu kann ein Excimer-Laser verwendet werden, der Einzelpulse mit einer Energie über 0,5 Joule bei einer Leistungsdichte von 10 bis 50 J/cm2 generiert. Als Pulsfrequenz sind Werte über 10 Hz bevorzugt. Der Prozessgasdruck sollte über 1 mbar betragen. Die Beschichtungstemperatur kann frei gewählt werden innerhalb des Bereichs, der von der Raumtemperatur und der zulässigen Anlasstemperatur des zu beschichtenden Substrats definiert wird. Für nicht-austenitische Stahlwerkstoffe beträgt diese Obergrenze bspw. 600°C. Der Targetabstand und der Laserwinkel sind abhängig von der Geometrie des zu beschichtenden Substrats.For this purpose, an excimer laser can be used which generates individual pulses with an energy of more than 0.5 Joule at a power density of 10 to 50 J / cm 2 . Values above 10 Hz are preferred as the pulse rate. The process gas pressure should be above 1 mbar. The coating temperature can be freely selected within the range defined by the room temperature and the allowable tempering temperature of the substrate to be coated. For non-austenitic steel materials, this upper limit is, for example, 600 ° C. The target distance and the laser angle depend on the geometry of the substrate to be coated.
Claims (9)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014018256.8A DE102014018256A1 (en) | 2014-12-11 | 2014-12-11 | Piston for an internal combustion engine |
PCT/EP2015/079435 WO2016092078A1 (en) | 2014-12-11 | 2015-12-11 | Piston for an internal combustion engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014018256.8A DE102014018256A1 (en) | 2014-12-11 | 2014-12-11 | Piston for an internal combustion engine |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102014018256A1 true DE102014018256A1 (en) | 2016-06-16 |
Family
ID=54848576
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102014018256.8A Withdrawn DE102014018256A1 (en) | 2014-12-11 | 2014-12-11 | Piston for an internal combustion engine |
Country Status (2)
Country | Link |
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DE (1) | DE102014018256A1 (en) |
WO (1) | WO2016092078A1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7458358B2 (en) * | 2006-05-10 | 2008-12-02 | Federal Mogul World Wide, Inc. | Thermal oxidation protective surface for steel pistons |
WO2013063342A1 (en) * | 2011-10-27 | 2013-05-02 | Federal-Mogul Corporation | Piston assembly including a polymer coating with hard particles applied to sliding surfaces |
CN104024615B (en) * | 2011-12-28 | 2016-08-17 | 本田技研工业株式会社 | Piston for explosive motor |
DE102012025283A1 (en) * | 2012-12-21 | 2014-06-26 | Mahle International Gmbh | Piston useful for an internal combustion engine comprises a piston head comprising a piston base and a peripheral piston junk and a piston shaft |
-
2014
- 2014-12-11 DE DE102014018256.8A patent/DE102014018256A1/en not_active Withdrawn
-
2015
- 2015-12-11 WO PCT/EP2015/079435 patent/WO2016092078A1/en active Application Filing
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Publication number | Publication date |
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WO2016092078A1 (en) | 2016-06-16 |
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R082 | Change of representative | ||
R082 | Change of representative | ||
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |