DE102008056727A1 - Method for producing a metallic layer on a base material of an aluminum component, comprises applying the layer on a surface of the component by thermal spraying, which is carried out with plasma treatment process - Google Patents

Abstract

The method for producing a metallic layer on a base material of an aluminum component (1) comprises applying the layer on a surface of the component by thermal spraying, where the thermal spraying is carried out with plasma treatment process by which the surface of the component is cleaned and activated. The plasma treatment process precedes the thermal spraying and is carried out with light arc plasma, which is produced with a tungsten-inert gas-burner. The surface is melted by suitably adjusting the plasma treatment processes. The component surface is cooled.

Description

The The invention relates to a method for producing a layer a base material of a component, wherein the layer on a Surface of the component is applied by thermal spraying.

The Method is more wear resistant, in particular for the production Layers on components of internal combustion engines suitable, preferably for the coating of connecting rod bearings or cylinder liners in crankcases. Such components are usually Made of aluminum alloys, for the measures must be made for wear protection.

For this It is known, liners made of a wear-resistant Use material, for example, gray cast iron or a ceramic material.

It are already different ways to apply known by thermal spray coatings, with which the wear resistance can be increased.

For example, in the DE 196 43 029 A1 a method for coating a particular of an aluminum alloy component of an internal combustion engine by a laser beam, in which an aluminum-silicon powder is converted by means of a powder conveyor in cooperation with a laser beam from the solid to the molten phase and applied to the component surface, whereupon In the following solidification process finely dispersed silicon is released.

Furthermore, from the DE 199 41 563 A1 a method for machining a surface of a component is known in which the surface of the component is swept by a laser beam and the beam of a plasma torch.

Of the Invention is based on the object, an improved method for producing a layer on a base material of a component specify the layer on a surface of the component is applied by thermal spraying.

The Object is according to the invention with a method solved, which specified in claim 1 features having.

advantageous Embodiments of the invention are the subject of the dependent claims.

at the process of the invention is the thermal Spraying in one operation with a plasma processing process, with which the surface of the component is cleaned and activated is carried out. The cleaning and activation effect is by tearing open the oxide layer and removing it caused by impurities. This is a good adhesion of the thermal achieved applied layer. Since the plasma processing operation and the thermal spraying performed in one operation is a special mechanical preparation of the to be coated Surface not required.

Advantageous It is there, when the plasma processing process the thermal Spraying precedes and the plasma is generated with an arc.

Further is it possible that the surface of the component, on which the layer is applied, by appropriate adjustment of the plasma processing process is melted. This can be the Adhesion of the applied layer can be improved.

A Another advantageous embodiment of the method provides that the component surface during the machining process or cooled immediately thereafter. By the increase the cooling rate can improve the texture be achieved and damage to the coating Crack formation can be avoided.

The Method can be applied to applying different layers Base materials are used, it is particularly suitable for Treatment of aluminum components, on their surface a silicon-containing layer is to be applied.

A Particularly advantageous embodiment of the method provides that the plasma processing process is performed with a tungsten inert gas burner becomes.

• 1. Gegenüber bekannten thermischen Spritzverfahren wird eine bessere Anbindung von thermisch gespritzten Schichten auf dem Grundwerkstoff erreicht, so dass eine hohe Haftfähigkeit der aufgebrachten Schicht gewährleistet ist.
• 2. Es sind keine speziellen mechanischen Vorbereitungsarbeitsgänge erforderlich.
• 3. Durch den Plasmabearbeitungsprozess wird die Oberfläche des zu bearbeitenden Bauteils gereinigt und aktiviert, wobei Verunreinigungen, beispielsweise ölhaltige Rückstände, verdampfen und Oxidschichten aufgerissen werden.
• 4. Da die Aktivierung und Reinigung inline in einem Prozessschritt erfolgt, ergibt sich eine Vereinfachung und damit eine Kostensenkung für das Aufbringen der Schicht.

The process is characterized by a number of advantages. Which includes:

• 1. Compared with known thermal spraying method better connection of thermally sprayed layers is achieved on the base material, so that a high adhesion of the applied layer is ensured.
• 2. No special mechanical preparation work is required.
• 3. The plasma processing process cleans and activates the surface of the component to be processed, vaporizing contaminants, such as oily residues, and tearing up oxide layers.
• 4. Since the activation and cleaning inline in egg takes place in a process step, there is a simplification and thus a cost reduction for the application of the layer.

Further Advantages, features and details of the invention are described below with reference to an embodiment with reference to the drawing described.

there shows:

1 a schematic representation of a coating process on a metallic substrate

In 1 an embodiment is shown in which on a component 1 a sprayed layer 2 is applied. The application is carried out by combining a thermal spraying process with a leading arc plasma. The device used for this purpose contains a coating burner 3 and a plasma torch 4 , The component 1 is moved past under this arrangement. It is first with the plasma torch 4 generates an arc plasma. As plasma torch 4 In the example shown here, a tungsten inert gas burner is used whose plasma jets 7 on the surface to be processed immediately before the point on which the spray particles 3 hit, is addressed. The application of the spray coat 2 takes place in a thermal process by using the coating burner 3 spray particles 5 on the surface of the component 1 be applied. Both the spot on which the plasma jets 7 impinge, as well as the spot on which the spray particles 5 are from a protective gas bell 8th surround. The protective gas 6 is from the plasma torch 4 supplied to the surface at the point to be processed.

1

component

2

spray layer

3

coating burner

4

plasma torch

5

spray particles

6

protective gas

7

plasma jets

8th

Gas shroud

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 19643029 A1 [0005]
• - DE 19941563 A1 [0006]

Claims (8)

Method for producing a layer on a base material of a component ( 1 ), wherein the layer on a surface of the component ( 1 ) is applied by thermal spraying, characterized in that the thermal spraying in one operation with a plasma processing process, with which the surface of the component is cleaned and activated, is performed. Method according to claim 1, characterized in that that the plasma processing process precedes thermal spraying. Method according to claim 1 or 2, characterized that the plasma processing process is performed with an arc plasma becomes. Method according to one of the preceding claims, characterized in that the arc plasma is generated with a tungsten inert gas burner becomes. Method according to one of the preceding claims, characterized in that the surface by suitable Setting the plasma processing process is melted. Method according to one of the preceding claims, characterized in that the component surface is cooled becomes. Method according to one of the preceding claims, characterized in that the layer on an aluminum component is applied. Method according to one of the preceding claims, characterized in that with the thermal spraying a metallic Layer is applied.