WO2011018343A1

WO2011018343A1 - Method for producing a sliding coating on a plain bearing component and corresponding plain bearing component

Info

Publication number: WO2011018343A1
Application number: PCT/EP2010/061018
Authority: WO
Inventors: Gudrun Martin; Cedric Zimmermann
Original assignee: Schaeffler Technologies Gmbh & Co. Kg
Priority date: 2009-08-12
Filing date: 2010-07-29
Publication date: 2011-02-17
Also published as: DE102009037262A1

Abstract

The invention relates to a method for producing a sliding layer on a plain bearing component, wherein a porous coating is applied to the plain bearing component by means of a thermal spraying method, wherein at least a portion of the pores have a sliding material applied by means of vacuum impregnation, wherein the sliding material is used in a suspension.

Description

Name of the invention

Method for producing a sliding layer on a sliding bearing component and associated plain bearing component

description

Field of the invention

The invention relates to a method for producing a sliding layer on a sliding bearing component, in which a porous coating is applied to the sliding bearing component by means of a thermal spraying method, wherein at least a part of the pores is provided with a sliding material by means of vacuum impregnation.

Background of the invention

The term "slide bearing component" as used in this application particularly includes slide bushes and spherical plain bearings as well as other components used in high performance plain bearings Such high performance plain bearings are suitable for aggressive or corrosive media such as salt water, oil or the like.

DE 10 2007 035 342 A1 proposes a method for producing a sliding layer on a plain bearing component, in which a porous coating is applied to the plain bearing component and at least part of the pores are provided with a sliding material. The functionality and reliability of the sliding bearing should be increased by the porous layer forms a reservoir for the sliding material, which can be dispensed finely dosed during operation and serves as a long-term lubrication. From EP 0 852 298 B1 a sliding bearing material is known, consisting of a metallic support body on which a bronze layer is sintered porous, the pores are filled by vacuum infiltration with polytetrafluoroethylene. The PTFE is embedded in the pores of the bronze layer and acts as a solid lubricant.

The patent US Pat. No. 5,217,814 describes a sintered sliding material in which a porous layer of copper or a copper alloy, the pores of which are filled with a sliding material, is sintered on a metallic carrier.

A method for producing a self-lubricating bearing is known from EP 1 412 1 12 B1, in which bronze powder is pressed and subsequently sintered. The pores of the sintered bronze are filled with PTFE by vacuum infiltration.

Although in each case individual aspects have been improved in these known production methods for plain bearing components, there is a need for a production method which enables a simple and cost-effective production of a sliding bearing component with which a reliable and permanently trouble-free operation is possible.

Summary of the invention

The invention has for its object to provide a method for producing a sliding layer on a sliding bearing component, which allows easy production of a permanently trouble-free insertable sliding bearing component. To solve this problem, it is provided according to the invention in a method of the type mentioned that the sliding material is used in a suspension.

Within the scope of the invention it has been found that an optimal infiltration of the sliding material into the pores can be achieved when the sliding material is used in a suspension. In this way, the sliding material also reaches areas that are removed from the surface of the porous coating, so that a permanent supply of the sliding surface is ensured with the sliding material. Due to the particularly homogeneous distribution of the sliding material, sufficient sliding lubrication can be achieved under all operating conditions.

The method according to the invention is particularly suitable for thermal spraying methods such as plasma spraying, flame spraying, arc spraying and laser spraying. When the porous coating is applied by one of these thermal spraying methods, a particularly durable porous coating having an optimum surface structure results.

According to one embodiment of the method, a metallic coating can be applied which consists in particular of bronze or a bronze-containing alloy. Optionally, the coating may also contain non-metallic materials, depending on the intended use.

It is particularly preferred in the inventive method that the sliding material is used in a suspension with water, a plastic or a synthetic resin. By means of these suspensions, which contain different carrier liquids, the introduction of the sliding material into the pores is facilitated. As synthetic resins, in particular polyacrylic methacrylate, Methacrylate monomers or acrylate monomers. In this way, the sliding material is bound in the synthetic resin and released gradually.

A further improvement of the method according to the invention can be achieved by providing the suspension with an emulsifier. By using the emulsifier, the mixing of the sliding material with the carrier liquid is improved and stabilized, an automatic separation of the liquid and the solid phase is avoided.

According to a development of the method according to the invention, it can be provided that a suspension with polyamide-imide (PAI), phenol, polyesterimide (PESI), polyimide (PI) or polyethehmide (PEI) is used. These substances can be constituents of the synthetic resin which is used with the sliding material in a suspension.

With the method according to the invention, an optimum sliding layer can be produced if one or more of the following substances is or are used as a sliding material in powder form, as particles, fibers, nanotubes, platelets or spheres: polytetrafluoroethylene (PTFE), graphite, molybdenum sulfide, tungsten disulfide.

In addition, the invention relates to a sliding bearing component, with a sliding layer having a porous coating, wherein at least a part of the pores is provided with a sliding material.

The sliding bearing component according to the invention is characterized in that it is produced by the method described. Brief description of the drawings

Further advantages and details of the invention will be explained with reference to embodiments with reference to the drawings. The drawings are schematic representations and show:

Fig. 1 shows an inventive sliding bearing component in a cut

View;

FIG. 2 shows an enlarged detail of the sliding bearing component of FIG. 1 in the region of the sliding layer; FIG.

Fig. 3 is a micrograph of a sliding bearing component according to the invention; and

Fig. 4 is a microsection of another sliding bearing component according to the invention.

DETAILED DESCRIPTION OF THE DRAWINGS FIG. 1 shows an exemplary embodiment of a slide bearing component 1, which is designed as a one-piece spherical plain bearing. The sliding bearing component has an outer ring with an annular body 2, an outer lateral surface 3 and an inner lateral surface 4. On the inner circumferential surface 4, a sliding layer 5 has been applied by means of a thermal spraying process. In the illustrated embodiment, a porous coating 6 was applied by plasma spraying. The porous coating 6 is made of bronze. The coating 6 has a porous surface 7, in whose pores a sliding material 8 is introduced, which is infiltrated into the pores 9 of the coating. The sliding material 8 is used in a suspension, water being used as carrier material is used. After drying the water, the sliding material 8 remains in the pores 9, whereby the desired sliding layer is produced. In this case, the sliding material 8 comprises a mixture of graphite 10 and polytetrafluoroethylene (PTFE) 11.

FIG. 2 shows an enlarged detail of the sliding bearing component of FIG. 1 in the region of the porous coating. On the inner circumferential surface 4 of the ring body 2 is the applied by means of plasma spraying porous coating 6, the pores 9 are filled with the suspension containing the sliding material. The porous surface 7 is coated with the sliding material, whereby the sliding layer is formed. The suspension used for the vacuum impregnation comprises 55 to 65 weight percent PTFE, 33.5 to 42.5 weight percent water and 0.5 to 3 weight percent of an emulsifier. Another suspension comprises polyamideimide, phenol, polyestemide, polyimide or polyethermide as a carrier liquid. In another suspension, low-viscosity polyacrylmethacrylate is used as a carrier, to which the lubricants graphite and PTFE are mixed in different amounts. One suspension has 20% by weight of graphite, another suspension has 10% by weight of PTFE, another suspension contains 5% by weight of PTFE and 5% by weight of graphite.

FIG. 3 shows a micrograph of a plain bearing component produced according to the method described. In this case the suspension contains 20% by weight of graphite. In Fig. 3 can be seen a base material 13, was applied to the pores having coating 6. Likewise, the consisting of the sliding material sliding layer 12 is visible. It is essential that in the region of the porous coating 6 all pores are completely filled with the sliding material.

FIG. 4 shows a micrograph of another sliding bearing component which has been produced by the described method. In this case, too, the Kuumimprägnierung with a suspension containing 20 weight percent graphite. On the base material 13 there is the porous coating 6 produced by plasma spraying and on this the sliding layer 12. It can be seen that almost all the pores of the porous coating 6 are filled with the sliding material. The vacuum impregnation was carried out with a suspension consisting of graphite as a solid lubricant and a synthetic resin, wherein polyacrylate-methacrylate was used.

LIST OF REFERENCE NUMBERS

1 slide bearing component

2 ring bodies

3 outer surface

4 inner lateral surface

5 sliding layer

6 coating

7 surface

8 sliding material

9 pores

10 graphite

1 1 polytetrafluoroethylene

12 sliding layer

13 basic material

Claims

claims

1. A method for producing a sliding layer on a sliding bearing component, wherein a porous coating is applied to the sliding bearing component by means of a thermal spraying method, wherein at least a portion of the pores is provided by means of vacuum impregnation with a sliding material, characterized in that the sliding material in a suspension is used.

2. The method according to claim 1, characterized in that the injection method from the group comprising plasma spraying, flame spraying, arc spraying and laser spraying, is selected.

3. The method according to claim 1 or 2, characterized in that a metallic coating, in particular of bronze or a bronze-containing alloy is used

4. The method according to any one of the preceding claims, character- ized in that the sliding material is used in a suspension with water, a plastic or a synthetic resin, in particular Polyacrylmethac- rylat.

5. The method according to claim 4, characterized in that an artificial resin is used with methacrylate or acrylate monomers.

6. The method according to claim 4 or 5, characterized in that a suspension is used with an emulsifier.

7. The method according to any one of claims 4 to 6, characterized in that a suspension with polyamide-imide (PAI), phenol, polyesterimide (PESI), polyimide (PI) or polyetherimide (PEI) is used.

8. The method according to any one of the preceding claims, characterized in that one or more of the following substances is used as a sliding material in powder form, as particles, fibers, nanotubes, platelets or spheres: polytetrafluoroethylene (PTFE), graphite, molybdenum disulfide, tungsten disulfide ,

9. plain bearing component, with a sliding layer having a porous coating, wherein at least a portion of the pores is provided with a sliding material, characterized in that the sliding bearing component (1) is produced by a method according to one of the claims 1 to 8.