EP1920150B1 - Method for coating the outer surface of a cylinder bushing - Google Patents

Method for coating the outer surface of a cylinder bushing Download PDF

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Publication number
EP1920150B1
EP1920150B1 EP06791335A EP06791335A EP1920150B1 EP 1920150 B1 EP1920150 B1 EP 1920150B1 EP 06791335 A EP06791335 A EP 06791335A EP 06791335 A EP06791335 A EP 06791335A EP 1920150 B1 EP1920150 B1 EP 1920150B1
Authority
EP
European Patent Office
Prior art keywords
cylinder liner
cylinder
coating
cylinder bushing
melt
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.)
Expired - Fee Related
Application number
EP06791335A
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German (de)
French (fr)
Other versions
EP1920150A1 (en
Inventor
Gerhard Bucher
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Mahle International GmbH
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Mahle International GmbH
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Publication date
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Publication of EP1920150A1 publication Critical patent/EP1920150A1/en
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Expired - Fee Related legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0009—Cylinders, pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0081—Casting in, on, or around objects which form part of the product pretreatment of the insert, e.g. for enhancing the bonding between insert and surrounding cast metal
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/38—Wires; Tubes
    • 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
    • F02F1/00—Cylinders; Cylinder heads 

Definitions

  • the invention relates to a method for coating the outer surface of a cylinder liner according to the preamble of claim 1.
  • the object of the invention is to avoid this disadvantage of the prior art and also to provide a simple and inexpensive coating process.
  • a cylinder liner which consists of an iron-based material that may be alloyed or unalloyed.
  • the cylinder liner is made of gray cast iron, which may contain either lamellar graphite, vermicular graphite or nodular graphite.
  • the gray cast iron can in this case have a ferritic-pearlitic, a pearlitic, a bainitic or an austenitic basic structure.
  • the outer surface of the cylinder liner may be smooth. But it can also have all other surface finishes to a flat Raugussober Structure.
  • the outer surface, the front side and the inner surface of the cylinder liner can be pre-machined by turning.
  • the cylinder crankcase is made of one of the common light alloy castings, using both aluminum-based castings such as EN AC-AISi10Mg (Fe), EN AC-AlSi10Mg (Cu), ENAC-AlSi9Cu3 (Fe), EN AC-AISi12 (Cu) , as well as magnesium-based, such as EN MC-MgA19Zn1 (A), EN MC-MgY4RE3Zr eligible.
  • aluminum-based castings such as EN AC-AISi10Mg (Fe), EN AC-AlSi10Mg (Cu), ENAC-AlSi9Cu3 (Fe), EN AC-AISi12 (Cu)
  • magnesium-based such as EN MC-MgA19Zn1 (A), EN MC-MgY4RE3Zr eligible.
  • the outer surface of the cylinder liner is coated by dipping. In preparation for this, it is necessary to clean the outer surface of dirt and oxides and then roughen. Suitable methods for this are brushing and / or blasting. For example, coarse corundum, ie, crystallized Al 2 O 3 , can be used for blasting.
  • the outer surface of the cylinder liner is pickled and / or coated with a flux, which is zinc chloride-aluminum chloride double salt or salmiacite (ammonium chloride) is suitable. This is to remove oxides from the outer surface of the cylinder liner to promote the alloying of a metal layer described below.
  • a flux which is zinc chloride-aluminum chloride double salt or salmiacite (ammonium chloride) is suitable. This is to remove oxides from the outer surface of the cylinder liner to promote the alloying of a metal layer described below.
  • the subsequent dipping process for coating the outer surface of the cylinder liner takes place in a zinc-aluminum-copper melt with 3% to 12% copper and 2% to 8% aluminum, the remainder of the melt being zinc.
  • a zinc-aluminum-copper melt with 3% to 12% copper and 2% to 8% aluminum, the remainder of the melt being zinc.
  • up to 1% magnesium may be added to the melt.
  • the cylinder liner is so far submerged in the melt until a small, over the entire axial length of the cylinder liner continuous segment of the outer surface but not the inner surface of the cylinder liner is wetted by the melt.
  • the cylinder liner is then rotated about its longitudinal axis, wherein the melt is set by ultrasound in a high-frequency movement. This promotes alloying between the cylinder liner alloy and the zinc base alloy of the melt to form a layered intermetallic and mixed crystal layer system that provides metallic bonding of the cylinder liner with the surrounding metal layer.
  • the metal layer has reached a thickness of 100 microns to 300 microns, and the cylinder liner is removed from the melt.
  • the cylinder liner is then mounted horizontally in a holder, wherein excess melt drips and solidifies the applied metal layer.
  • the copper component of the alloy has the advantage that an oxide film that may form during coating does not become too dense, so that it peels off easily when poured.
  • the liquidus temperature of the melt is between 440 ° C and 520 ° C, causing the metal layer to melt from its encapsulation material as the cylinder crankcase is cast, thereby ensuring the metallic bond between the cylinder liner and the cylinder crankcase encapsulant. If the gravity casting method is used for this, it is necessary to heat the coated cylinder liners to 300 ° C to 400 ° C. This is omitted in the application of the die-casting process for the production of the cylinder crankcase.

Landscapes

  • 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)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Coating With Molten Metal (AREA)

Abstract

The invention relates to a method for coating the outer surface of a cylinder bushing. A small segment of the cylinder bushing is immersed into a melt which consists of a zinc based alloy comprising alloy components of aluminium and copper and which extends in a continuous manner over the entire axial length of the cylinder bushing, after cleaning and roughening the external surface, and said cylinder bushing is rotated about the longitudinal axis thereof, until a metal layer is formed on the outer surface of the cylinder bushing, which extends in a continuous manner over the entire length thereof and which consists of a zinc based alloy. The copper prevents an oxide skin, which is difficult to remove from the metal layer, from forming and also increases rigidity in the binding layer.

Description

Die Erfindung betrifft ein Verfahren zum Beschichten der Außenfläche einer Zylinderlaufbuchse nach dem Oberbegriff des Anspruches 1.The invention relates to a method for coating the outer surface of a cylinder liner according to the preamble of claim 1.

Um das Gewicht von Kraftfahrzeugen zu reduzieren, und um auf diesem Wege Kraftstoff zu sparen, werden Zylinderkurbelgehäuse aus Leichtmetall, insb. aus Aluminium gegossen. Diese weisen aber derart schlechte tribologische Eigenschaften auf, dass bei deren Herstellung aus einem Eisenbasiswerkstoff, wie beispielsweise aus Grauguss, bestehende Zylinderlaufbuchsen in das Zylinderkurbelgehäuse mit eingegossen werden. Hierbei ergeben sich die Probleme, die Zylinderlaufbuchsen ausreichend fest im Zylinderkurbelgehäuse zu verankern, und einen ausreichenden Wärmeübergang zwischen den Zylinderlaufbuchsen und dem Zylinderkurbelgehäuse zu gewährleisten. Diese Probleme können dadurch gelöst werden, dass die Außenflächen der Zylinderlaufbuchsen eine Rauhgussstruktur mit Hinterschnitten erhalten. Dies bringt aber mit sich, dass die Stege zwischen den in das Zylinderkurbelgehäuse eingegossenen Zylinderlaufbuchsen sehr breit sind, und dass deshalb der Platzbedarf der Zylinderlaufbuchsen sehr groß ist.In order to reduce the weight of motor vehicles, and to save fuel in this way, cylinder crankcases made of light metal, esp. Of aluminum are cast. However, these have such poor tribological properties that in their production of an iron-based material, such as gray cast iron, existing cylinder liners are poured into the cylinder crankcase with. This results in the problems of anchoring the cylinder liners sufficiently firmly in the cylinder crankcase, and to ensure sufficient heat transfer between the cylinder liners and the cylinder crankcase. These problems can be solved by giving the outer surfaces of the cylinder liners a roughcast structure with undercuts. However, this entails that the webs between the cast-in cylinder liners in the cylinder liners are very wide, and therefore that the space requirement of the cylinder liners is very large.

Im Rahmen des Trendes bei der Motorenentwicklung, die Motoren bei gleichbleibender Leistung zu verkleinern, ergibt sich die Notwendigkeit, die Abstände zwischen den einzelnen Zylinderlaufbuchsen zu verringern und zudem die Wärmeabfuhr vom Brennraum über die Zylinderlaufbuchse zu den Kühlräumen des Zylinderkurbelgehäuses zu verbessern. Diese Probleme können dadurch gelöst werden, dass als Alternative zur Raugussbuchse Zylinderlaufbuchsen aus Grauguss mit einer glatten oder mäßig rauen Außenfläche und mit einer Beschichtung verwendet werden, die das Anbinden der Zylinderlaufbuchse an das Umgussmaterial des Zylinderkurbelgehäuses sicherstellt.As part of the trend in engine development to downsize the engines while maintaining power, there is a need to reduce the distances between the individual cylinder liners and also to improve the heat dissipation from the combustion chamber via the cylinder liner to the cooling chambers of the cylinder crankcase. These problems can be solved by using cylinder casings made of gray cast iron with a smooth or moderately rough outer surface and with a coating as an alternative to the Raugussbuchse Ensures the binding of the cylinder liner to the Umgussmaterial the cylinder crankcase.

Aus der US-Patentschrift mit der Nummer 5,333,668 ist es bekannt, hierzu eine Zink-Basis-Legierung mit 5. % Aluminium zu verwenden. Nachteilig ist hierbei, dass die aus dem Stand der Technik bekannte Beschichtung sehr schnell oxidiert, und nur mäßige Festigkeitswerte aufweist, was die Güte der metallischen Bindung der Beschichtung mit dem Umgussmaterial des Zylinderkurbelgehäuses beeinträchtigt.It is known from US Pat. No. 5,333,668 to use a zinc-based alloy with 5% aluminum for this purpose. The disadvantage here is that the known from the prior art coating oxidized very quickly, and only moderate strength values, which affects the quality of the metallic bond of the coating with the Umgussmaterial the cylinder crankcase.

Aufgabe der Erfindung ist es, diesen Nachteil des Standes der Technik zu vermeiden und zudem ein einfaches und preisgünstiges Beschichtungsverfahren zur Verfügung zu stellen.The object of the invention is to avoid this disadvantage of the prior art and also to provide a simple and inexpensive coating process.

Gelöst wird diese Aufgabe mit den im Kennzeichen des Hauptanspruches stehenden Merkmalen. Zweckmäßige Ausgestaltungen der Erfindung sind Gegenstand der Unteranprüche.This problem is solved with the features in the characterizing part of the main claim. Advantageous embodiments of the invention are the subject of Unteranprüche.

Das erfindungsgemäße Verfahren zum Beschichten einer in ein Zylinderkurbelgehäuse einzugießenden Zylinderlaufbuchse wird im Folgenden näher erläutert.The inventive method for coating a zuzugießenden in a cylinder crankcase cylinder liner will be explained in more detail below.

Verwendet wird hierzu eine Zylinderlaufbuchse, die aus einem Eisenbasiswerkstoff besteht, das legiert oder unlegiert sein kann. Vorzugsweise besteht die Zylinderlaufbuchse aus Grauguss, der entweder lamellares Graphit, Vermikulargraphit oder Kugelgraphit enthalten kann. Der Grauguss kann hierbei ein ferritisch-perlitisches, ein perlitisches, ein bainitisches oder ein austenitisches Grundgefüge aufweisen. Die Außenfläche der Zylinderlaufbuchse kann glatt ausgebildet sein. Sie kann aber auch alle weiteren Oberflächengüten bis hin zu einer flache Raugussoberfläche aufweisen. Darüberhinaus können die Außenfläche, die Stirnseite und die Innenfläche der Zylinderlaufbuchse durch Drehen vorbearbeitet sein.For this purpose, a cylinder liner is used, which consists of an iron-based material that may be alloyed or unalloyed. Preferably, the cylinder liner is made of gray cast iron, which may contain either lamellar graphite, vermicular graphite or nodular graphite. The gray cast iron can in this case have a ferritic-pearlitic, a pearlitic, a bainitic or an austenitic basic structure. The outer surface of the cylinder liner may be smooth. But it can also have all other surface finishes to a flat Raugussoberfläche. In addition, the outer surface, the front side and the inner surface of the cylinder liner can be pre-machined by turning.

Zum Eingießen der Zylinderlaufbuchse in das Zylinderkurbelgehäuse können alle gebräuchlichen Gießverfahren, wie beispielsweise das Druckgießverfahren, das Pressgießverfahren, das Schwerkraftgießverfahren oder das Niederdruck-Gießverfahren verwendet werden.For pouring the cylinder liner into the cylinder crankcase, all common casting methods, such as the die casting method, die casting method, gravity casting method or low pressure casting method can be used.

Das Zylinderkurbelgehäuse besteht aus einem der gebräuchlichen Leichtmetall-Gusswerkstoff, wobei sowohl Gusswerkstoffe auf Aluminiumbasis, sie beispielsweise EN AC-AISi10Mg(Fe), EN AC-AlSi10Mg(Cu), EN AC-AlSi9Cu3(Fe), EN AC-AISi12(Cu), als auch auf Magnesium-Basis, wie beispielsweise EN MC-MgA19Zn1(A), EN MC-MgY4RE3Zr in Frage kommen.The cylinder crankcase is made of one of the common light alloy castings, using both aluminum-based castings such as EN AC-AISi10Mg (Fe), EN AC-AlSi10Mg (Cu), ENAC-AlSi9Cu3 (Fe), EN AC-AISi12 (Cu) , as well as magnesium-based, such as EN MC-MgA19Zn1 (A), EN MC-MgY4RE3Zr eligible.

Um beim Eingießen der Zylinderlaufbuchse in das Zylinderkurbelgehäuse die metallische Bindung der Zylinderlaufbuchse mit dem Umgussmaterial des Zylinderkurbelgehäuses sicherzustellen, wird die Außenfläche der Zylinderlaufbuchse im Tauchverfahren beschichtet. Als Vorbereitung hierfür ist es erforderlich, die Außenfläche von Schmutz und Oxiden zu säubern und anschließend aufzurauen. Geeignete Verfahren hierzu sind das Bürsten und/oder das Strahlen. Beispielsweise kann zum Strahlen grobes Korund, d.h., kristallisiertes Al2O3 verwendet werden.In order to ensure the metallic bond of the cylinder liner with the encapsulation material of the cylinder crankcase when pouring the cylinder liner into the cylinder crankcase, the outer surface of the cylinder liner is coated by dipping. In preparation for this, it is necessary to clean the outer surface of dirt and oxides and then roughen. Suitable methods for this are brushing and / or blasting. For example, coarse corundum, ie, crystallized Al 2 O 3 , can be used for blasting.

Im Anschluss daran wird die Außenfläche der Zylinderlaufbuchse gebeizt und/oder mit einem Flussmittel bestrichen, wozu sich Zinkchlorid-Aluminiumchlorid-Doppelsalz oder Salmiakstein (Ammoniumchlorid) eignet. Dies bezweckt, Oxide von der Außenfläche der Zylinderlaufbuchse zu entfernen, um das Anlegieren einer im Folgenden beschriebenen Metallschicht zu fördern.Subsequently, the outer surface of the cylinder liner is pickled and / or coated with a flux, which is zinc chloride-aluminum chloride double salt or salmiacite (ammonium chloride) is suitable. This is to remove oxides from the outer surface of the cylinder liner to promote the alloying of a metal layer described below.

Das hierauf folgende Tauchverfahren zur Beschichtung der Außenfläche der Zylinderlaufbuchse erfolgt in einer Zink-Aluminium-Kupfer-Schmelze mit 3 % bis 12 % Kupfer und 2 % bis 8 % Aluminium, wobei der Rest der Schmelze Zink ist. Zur Förderung der Ausscheidungshärtung kann der Schmelze bis zu 1 % Magnesium zugegeben werden.The subsequent dipping process for coating the outer surface of the cylinder liner takes place in a zinc-aluminum-copper melt with 3% to 12% copper and 2% to 8% aluminum, the remainder of the melt being zinc. To promote precipitation hardening, up to 1% magnesium may be added to the melt.

Hierbei wird die Zylinderlaufbuchse so weit in die Schmelze getaucht, bis ein kleines, über die gesamte axiale Länge der Zylinderlaufbuchse durchgehendes Segment der Außenfläche nicht aber die Innenfläche der Zylinderlaufbuchse von der Schmelze benetzt wird. Die Zylinderlaufbuchse wird dann um ihre Längsachse gedreht, wobei die Schmelze durch Ultraschall in eine hochfrequente Bewegung versetzt wird. Dadurch wird die Legierungsbildung zwischen der Legierung der Zylinderlaufbuchse und der Zinkbasislegierung der Schmelze gefördert, wobei ein Schichtsystem aus intermetallischen Phasen und Mischkristallen entsteht, das für die metallische Bindung der Zylinderlauffläche mit der umgebenden Metallschicht sorgt.Here, the cylinder liner is so far submerged in the melt until a small, over the entire axial length of the cylinder liner continuous segment of the outer surface but not the inner surface of the cylinder liner is wetted by the melt. The cylinder liner is then rotated about its longitudinal axis, wherein the melt is set by ultrasound in a high-frequency movement. This promotes alloying between the cylinder liner alloy and the zinc base alloy of the melt to form a layered intermetallic and mixed crystal layer system that provides metallic bonding of the cylinder liner with the surrounding metal layer.

Nach 3 bis 5 Minuten hat die Metallschicht eine Dicke von 100 µm bis 300 µm erreicht, und die Zylinderlaufbuchse wird der Schmelze entnommen. Die Zylinderlaufbuchse wird dann waagrecht in einer Halterung befestigt, wobei überschüssige Schmelze abtropft und die aufgetragene Metallschicht erstarrt.After 3 to 5 minutes, the metal layer has reached a thickness of 100 microns to 300 microns, and the cylinder liner is removed from the melt. The cylinder liner is then mounted horizontally in a holder, wherein excess melt drips and solidifies the applied metal layer.

Der Kupferbestandteil der Legierung hat den Vorteil, dass eine beim Beschichten sich möglicherweise bildende Oxidhaut nicht allzu dicht wird, sodass sie sich beim Eingießen leicht ablöst. Die Liquidustemperatur der Schmelze liegt zwischen 440 °C und 520°C, wodurch bewirkt wird, dass die Metallschicht beim Gießen des Zylinderkurbelgehäuses von dessem Umgussmaterial angeschmolzen wird, wodurch die metallische Bindung zwischen der Zylinderlaufbuchse und dem Umgussmaterial des Zylinderkurbelgehäuses sichergestellt wird. Wird hierzu das Schwerkraftgussverfahren angewandt, ist es erforderlich, die beschichteten Zylinderlaufbuchsen auf 300°C bis 400°C zu erwärmen. Dies entfällt bei der Anwendung des Druckgussverfahrens zur Herstellung des Zylinderkurbelgehäuses.The copper component of the alloy has the advantage that an oxide film that may form during coating does not become too dense, so that it peels off easily when poured. The liquidus temperature of the melt is between 440 ° C and 520 ° C, causing the metal layer to melt from its encapsulation material as the cylinder crankcase is cast, thereby ensuring the metallic bond between the cylinder liner and the cylinder crankcase encapsulant. If the gravity casting method is used for this, it is necessary to heat the coated cylinder liners to 300 ° C to 400 ° C. This is omitted in the application of the die-casting process for the production of the cylinder crankcase.

Claims (3)

  1. Method for coating the outer surface of a cylinder liner consisting of an iron-based material with the following procedure steps:
    - cleaning the outer surface,
    - roughening the outer surface by brushing and/or blasting,
    - coating the outer surface with a flux material that can be a zinc chloride-aluminum double salt or ammonium chloride,
    - dipping a small segment of the outer surface, which extends over the whole axial length of the cylinder liner, in a melt of a zinc-based alloy with 7% to 12% copper, with 2% to 8% aluminum and with up to 1% magnesium,
    - rotating the cylinder liner for 3 to 5 min. about its longitudinal axis until a metal layer, which consists of a zinc-based alloy and extends over the whole length of the cylinder liner, has formed on the outer surface of the cylinder liner,
    - removing the cylinder liner from the melt.
  2. The method of claim 1, characterized by the fact that the outer surface of the cylinder liner is blasted with corundum.
  3. The method of claim 1 or 2, characterized by the fact that the metal layer is formed with a thickness of 100 µm to 300 µm.
EP06791335A 2005-09-01 2006-08-31 Method for coating the outer surface of a cylinder bushing Expired - Fee Related EP1920150B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005041410A DE102005041410A1 (en) 2005-09-01 2005-09-01 Method for coating the outer surface of a cylinder liner
PCT/DE2006/001529 WO2007025531A1 (en) 2005-09-01 2006-08-31 Method for coating the outer surface of a cylinder bushing

Publications (2)

Publication Number Publication Date
EP1920150A1 EP1920150A1 (en) 2008-05-14
EP1920150B1 true EP1920150B1 (en) 2011-12-21

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EP06791335A Expired - Fee Related EP1920150B1 (en) 2005-09-01 2006-08-31 Method for coating the outer surface of a cylinder bushing

Country Status (8)

Country Link
US (1) US20090258140A1 (en)
EP (1) EP1920150B1 (en)
JP (1) JP2009507159A (en)
CN (1) CN101253321A (en)
BR (1) BRPI0615428A2 (en)
DE (1) DE102005041410A1 (en)
RU (1) RU2421540C2 (en)
WO (1) WO2007025531A1 (en)

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DE102011106564A1 (en) * 2011-07-05 2013-01-10 Mahle International Gmbh Method for producing a cylinder surface and cylinder liner
US8900729B2 (en) * 2012-11-19 2014-12-02 Guardian Industries Corp. Coated article with low-E coating including zinc oxide inclusive layer(s) with additional metal(s)
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DE102005041410A1 (en) 2007-03-08
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US20090258140A1 (en) 2009-10-15
RU2008111965A (en) 2009-10-20

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