DE19960646A1 - Production of a thermally and mechanically loaded surface layer on cast pistons in I.C. engines comprises applying an aluminum layer to the surface of the component and anodizing - Google Patents
Production of a thermally and mechanically loaded surface layer on cast pistons in I.C. engines comprises applying an aluminum layer to the surface of the component and anodizingInfo
- Publication number
- DE19960646A1 DE19960646A1 DE19960646A DE19960646A DE19960646A1 DE 19960646 A1 DE19960646 A1 DE 19960646A1 DE 19960646 A DE19960646 A DE 19960646A DE 19960646 A DE19960646 A DE 19960646A DE 19960646 A1 DE19960646 A1 DE 19960646A1
- Authority
- DE
- Germany
- Prior art keywords
- layer
- component
- anodizing
- thermally
- production
- 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.)
- Ceased
Links
Classifications
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/42—Electroplating: Baths therefor from solutions of light metals
- C25D3/44—Aluminium
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- 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
- C25D11/022—Anodisation on selected surface areas
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- 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
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
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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
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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
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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
- F05C2201/00—Metals
- F05C2201/02—Light metals
- F05C2201/021—Aluminium
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Herstellung einer thermisch und mechanisch hochbelastbaren Oberflächenschicht auf Bauteilen aus siliziumhaltigen Aluminiumlegierungen, insbesondere auf gegossenen Kolben für Verbrennungskraftmaschinen durch Hartanadosierung.The invention relates to a method for producing a thermal and mechanically heavy-duty surface layer on components silicon-containing aluminum alloys, especially on cast pistons for internal combustion engines by hard anado coating.
Unter Hartanadosierung oder Harteloxierung versteht man die Herstellung einer keramischen Oberflächenschicht auf metallischen Bauteilen durch galvanische Umwandlung der Metalle in Metalloxide. Bei Leichtmetallkolben für Verbrennungskraftmaschinen wird die Hartanodisierung schon lange angewendet, um insbesondere die Brennraummulden und Tragflächen für die Kolbenringe zu härten, um die thermische und mechanische Belastbarkeit zu verbessern und die Lebensdauer zu erhöhen (vergleiche DE 26 26 131, DE 29 21 952, FR 26 48 187).Hard anado-coating or hard anodizing means the production a ceramic surface layer on metallic components galvanic conversion of metals into metal oxides. For light alloy pistons Hard anodizing has been used for internal combustion engines for a long time applied to in particular the combustion chamber troughs and wings for the Harden piston rings to increase thermal and mechanical strength improve and increase the service life (compare DE 26 26 131, DE 29 21 952, FR 26 48 187).
Es hat sich jedoch gezeigt, daß die für Leichtmetallkolben bevorzugt verwendeten, siliziumhaltingen Aluminiumlegierungen mikroskopisch inhomogen sind, wobei neben der Mischkristallphase primäres und eutektisches Silizium sowie zahlreiche intermetallische Phasen vorliegen. Diese Phasen verhindern bei der Anodisierung das gleichmäßige Wachsen einer Hartanodisierungsschicht, so daß anodisierte Inseln neben mehr oder weniger nicht-anodisierten Oberflächenbereichen entstehen, die im Basiswerkstoff nicht ausreichend verankert sind und daher unter Belastung ausbrechen können. Sie wirken dann als Schmirgelmittel und erhöhen den Verschleiß.However, it has been shown that preferred for light metal pistons used silicon-containing aluminum alloys microscopically are inhomogeneous, whereby in addition to the mixed crystal phase primary and eutectic Silicon and numerous intermetallic phases are present. These phases prevent uniform growth of anodizing Hard anodizing layer, so that anodized islands next to more or less non-anodized surface areas arise that are not in the base material are sufficiently anchored and can therefore break out under stress. she then act as an abrasive and increase wear.
Der Erfindung liegt die Aufgabe zugrunde, diesen Mangel zu beheben und das bekannte Hartanodisierungsverfahren insbesondere für den eingangs genannten Anwendungsbereich so zu verbessern, daß auf den Bauteilen eine zuverlässig haftende Keramikschicht hergestellt werden kann, ohne daß hinsichtlich der erforderlichen Dicke und flächigen Erstreckung der Schicht Einschränkungen in Kauf genommen werden müssen.The invention has for its object to remedy this deficiency and Known hard anodizing processes, in particular for the one mentioned at the beginning To improve the application area so that a reliable on the components Adhesive ceramic layer can be made without the required thickness and areal extent of the layer restrictions have to be accepted.
Zur Lösung dieser Aufgabe wird vorgeschlagen, daß auf der Oberfläche des Bauteils zunächst eine Schicht aus Aluminium aufgebracht und daß die aufgebrachte Schicht anschließend in bekannter Weise anodisiert wird.To solve this problem it is proposed that on the surface of the Component first applied a layer of aluminum and that the applied layer is then anodized in a known manner.
Vorgeschlagen wird also die Herstellung einer mikroskopisch homogeneren Zwischenschicht, die einerseits problemlos auf die Basis-Oberfläche aufgebracht werden kann und sich innig mit ihr verbindet und die andererseits in üblicher Weise anodisch in Metalloxid umgewandelt werden kann und eine ganzflächig harte und verschleißfeste Metalloxidschicht bildet. Für Kolben aus Aluminium-Silizium-Legierungen hat sich für die Bildung einer 10 bis 80 µm dicken Al2O3-Schicht eine Aluminium-Zwischenschicht in der Größenordnung ≧ 10 µm als brauchbar herausgestellt.It is therefore proposed to produce a microscopically more homogeneous intermediate layer which, on the one hand, can be applied to the base surface without problems and connects intimately to it, and which, on the other hand, can be anodically converted into metal oxide and forms a hard and wear-resistant metal oxide layer over the entire surface. For pistons made of aluminum-silicon alloys, an aluminum intermediate layer in the order of magnitude ≧ 10 µm has been found to be useful for the formation of a 10 to 80 µm thick Al 2 O 3 layer.
Vorteilhafte Ausgestaltungen des Erfindungsgedankens sind in den Unteransprüchen 2 bis 9 beschrieben. Danach kann anstelle von Aluminium eine Schicht aus einer primärsiliziumfreien Aluminiumlegierung oder aus einem anderen auf der Oberfläche des Bauteils haftenden, hartanodisierbaren Metall aufgebracht werden. Das Aufbringen kann galvanisch, durch Aufdampfen, durch Plattieren, Löten oder Umschmelzen erfolgen. Vorzugsweise wird die aufgebrachte Schicht nicht über ihre gesamte Dicke durchanalysiert, vielmehr wird als Haftvermittlung zwischen der Basis- Oberfläche und der äußeren keramischen Schicht noch ein Teil der aufgebrachten Schicht in dem nach dem Aufbringen vorhandenen metallurgischen Zustand belassen. Advantageous refinements of the inventive concept are in the Subclaims 2 to 9 described. After that, instead of aluminum a layer made of a primary silicon-free aluminum alloy or another hard anodizable that adheres to the surface of the component Metal can be applied. The application can be galvanic, by Evaporation, plating, soldering or remelting. The applied layer is preferably not over its entire thickness thoroughly analyzed, rather as mediation between the basic Surface and the outer ceramic layer still part of the applied layer in the existing one after application leave metallurgical state.
Das erfindungsgemäße Verfahren kann wie bei den bekannten Hartanodisierverfahren auf die gesamte Oberfläche des Bauteils erstreckt werden, es kann aber auch wie bisher schon auf Oberflächenbereiche beschränkt werden, die besonders hohen thermischen und mechanischen Belastungen unterliegen. Schließlich kann das erfindungsgemäße Verfahren selbstverständlich auch bei Bauteilen aus anderen Basiswerkstoffen angewendet werden, die für eine direkte Hartanodisierung der Oberfläche nicht geeignet sind.The method according to the invention can, as in the known ones Hard anodizing extends over the entire surface of the component , but it can also be applied to surface areas as before limited, the particularly high thermal and mechanical Subject to charges. Finally, the method according to the invention naturally also used for components made of other basic materials are not suitable for direct hard anodizing of the surface are.
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19960646A DE19960646A1 (en) | 1999-12-16 | 1999-12-16 | Production of a thermally and mechanically loaded surface layer on cast pistons in I.C. engines comprises applying an aluminum layer to the surface of the component and anodizing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19960646A DE19960646A1 (en) | 1999-12-16 | 1999-12-16 | Production of a thermally and mechanically loaded surface layer on cast pistons in I.C. engines comprises applying an aluminum layer to the surface of the component and anodizing |
Publications (1)
Publication Number | Publication Date |
---|---|
DE19960646A1 true DE19960646A1 (en) | 2001-07-05 |
Family
ID=7932849
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19960646A Ceased DE19960646A1 (en) | 1999-12-16 | 1999-12-16 | Production of a thermally and mechanically loaded surface layer on cast pistons in I.C. engines comprises applying an aluminum layer to the surface of the component and anodizing |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE19960646A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10315232A1 (en) * | 2003-04-03 | 2004-10-28 | Federal-Mogul Nürnberg GmbH | Pistons for an internal combustion engine and method for producing a piston |
EP1528127A2 (en) * | 2003-10-28 | 2005-05-04 | Federal-Mogul Nürnberg GmbH | Component, especially piston and process for manufacturing a highly resistant surface on a component, especially on a piston |
WO2016024376A1 (en) * | 2014-08-11 | 2016-02-18 | Toyota Jidosha Kabushiki Kaisha | Method for manufacturing piston for direct injection engine |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2338063A1 (en) * | 1973-07-26 | 1975-04-03 | Siemens Ag | PROCESS FOR COATING HIGH-FREQUENCY HEATING COILS MADE OF COPPER, BRASS, SILVER OR ALUMINUM |
DE2626131A1 (en) * | 1976-06-11 | 1977-12-22 | Mahle Gmbh | HARD ANODIZED LIGHT ALLOY PISTON |
DE2166843B2 (en) * | 1971-05-07 | 1978-02-02 | Ausscheidung aus: 21 22 610 Siemens AG, 1000 Berlin und 8000 München | PROCESS FOR PRE-TREATMENT OF LIGHT METALS FOR THE GALVANIC DEPOSITION OF ALUMINUM |
DE2921952A1 (en) * | 1979-05-30 | 1980-12-04 | Volkswagenwerk Ag | Light alloy piston for IC engine - has hard wearing surface layer of aluminium oxide deposited electrolytically |
FR2648187A1 (en) * | 1989-06-07 | 1990-12-14 | Pechiney Recherche | DEVICE FOR THE ANODIZATION TREATMENT OF ALUMINUM ALLOY PISTONS USED IN INTERNAL COMBUSTION ENGINES |
DE19751256A1 (en) * | 1997-11-19 | 1999-05-27 | Ahc Oberflaechentechnik Gmbh | Die-cast aluminum part with an aluminum oxide conversion layer and process for its production |
-
1999
- 1999-12-16 DE DE19960646A patent/DE19960646A1/en not_active Ceased
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2166843B2 (en) * | 1971-05-07 | 1978-02-02 | Ausscheidung aus: 21 22 610 Siemens AG, 1000 Berlin und 8000 München | PROCESS FOR PRE-TREATMENT OF LIGHT METALS FOR THE GALVANIC DEPOSITION OF ALUMINUM |
DE2338063A1 (en) * | 1973-07-26 | 1975-04-03 | Siemens Ag | PROCESS FOR COATING HIGH-FREQUENCY HEATING COILS MADE OF COPPER, BRASS, SILVER OR ALUMINUM |
DE2626131A1 (en) * | 1976-06-11 | 1977-12-22 | Mahle Gmbh | HARD ANODIZED LIGHT ALLOY PISTON |
DE2921952A1 (en) * | 1979-05-30 | 1980-12-04 | Volkswagenwerk Ag | Light alloy piston for IC engine - has hard wearing surface layer of aluminium oxide deposited electrolytically |
FR2648187A1 (en) * | 1989-06-07 | 1990-12-14 | Pechiney Recherche | DEVICE FOR THE ANODIZATION TREATMENT OF ALUMINUM ALLOY PISTONS USED IN INTERNAL COMBUSTION ENGINES |
DE19751256A1 (en) * | 1997-11-19 | 1999-05-27 | Ahc Oberflaechentechnik Gmbh | Die-cast aluminum part with an aluminum oxide conversion layer and process for its production |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10315232A1 (en) * | 2003-04-03 | 2004-10-28 | Federal-Mogul Nürnberg GmbH | Pistons for an internal combustion engine and method for producing a piston |
EP1528127A2 (en) * | 2003-10-28 | 2005-05-04 | Federal-Mogul Nürnberg GmbH | Component, especially piston and process for manufacturing a highly resistant surface on a component, especially on a piston |
EP1528127A3 (en) * | 2003-10-28 | 2008-09-03 | Federal-Mogul Nürnberg GmbH | Component, especially piston and process for manufacturing a highly resistant surface on a component, especially on a piston |
WO2016024376A1 (en) * | 2014-08-11 | 2016-02-18 | Toyota Jidosha Kabushiki Kaisha | Method for manufacturing piston for direct injection engine |
CN106661756A (en) * | 2014-08-11 | 2017-05-10 | 丰田自动车株式会社 | Method for manufacturing piston for direct injection engine |
CN106661756B (en) * | 2014-08-11 | 2018-10-23 | 丰田自动车株式会社 | Method for manufacturing the piston for being used for direct injection ic engine |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OP8 | Request for examination as to paragraph 44 patent law | ||
8131 | Rejection |