WO2013167300A1 - Method for applying a cufe2p-based slide bearing material by roll cladding; corresponding slide bearing composite material - Google Patents

Description

 METHOD OF APPLYING WHEEL PLATING OF A SLIDE BASED MATERIAL BASED ON CUFE2P; CORRESPONDING BEARING COMPOSITE MATERIAL

5

Technical area

 10

 The invention relates to a method for applying a lead-free sliding bearing material with a matrix based on CuFe2P on a support layer.

15 State of the art

Lead-free sintered sliding bearing materials based on copper, in particular based on a bronze matrix, are known for their good thermal conductivity and their high wear and tear

20 Corrosion resistance compared to similar

 lead-containing materials. The development of such materials was based on the desire to replace lead-containing plain bearing materials, as lead is classified as pollutant polluting the environment. Lead has the function in the sliding bearing material

25 of a solid lubricant. For this solid lubrication rauss a replacement can be found. Otherwise, for example, a single-phase bronze material may have an increased tendency to eat under mixed conditions. Under this

 The point of view is one in the literature and in practice

30 series of different compositions have been studied

 and used.

In particular, DE 10 2009 002 894 A1 describes the use of CuFe 2 P as a sliding bearing material with high thermal

35 conductivity and good mechanical properties. to

Production of plain bearings is the bearing metal layer CuFe2P applied by sintering or casting on a steel backing layer.

By applying by sintering and in particular casting, however, it comes to iron accumulation in the

 Sliding bearing material based on CuFe2P, whereby the

Microstructure and the thermal conductivity of CuFe2P are adversely affected

necessary powders are produced by means of an expensive atomizing process.

The present invention is based on the object to provide a method for applying a sliding bearing material based on CuFe2P, which avoids the disadvantages mentioned above.

Summary of the invention

Surprisingly, it has now been found out that

Advantageously, CuFe2P can be applied to the support layer by roll-plating. Therefore, the present invention relates to a method of applying a plain bearing material {i. one

Sliding layer) based on CuFe2P on a supporting layer, in which the sliding bearing material based on CuFe2P on the

Support layer is roll-clad.

Detailed description of the invention

The invention as the basis of the plain bearing material

used CuFe2P (CW107C, C19400) is a copper alloy, which according to the DIN EN specification 2.1-2.6 wt .-% Fe, 0.05-0.2 wt .-% Zn, 0.015-0.15 wt. -% P, up to 0.03 wt. -% Pb and up to 0.2 wt. -% other additions, one for the purpose of the present invention is particularly suitable alloy is available under the name Wieland-K65 ^® and has the following composition (values):

According to the invention, the plain bearing material based on CuFe2P is applied to a supporting layer, in particular a supporting layer made of steel, by means of roll cladding. According to the invention, the roll cladding can be clad, for example, by hot roll plating or Kait roll bonding

(see, for example, Steel Information Center, Leaflet 383 - Clad Steel Sheet). In the method according to the invention is a suitable

Starting material {e.g. Continuous casting or rolled out strip) on the steel backing layer. Although then usually still a Giühschritt is required, can surprisingly diffuse from the support layer in the sliding bearing material diffusing with the erf indungsgemäßen method

Amount of iron are greatly reduced, so that the chemical and physical properties of the plain bearing material are no longer adversely affected. So contains

For example, a plain bearing material cast on a steel support layer about 0.8 wt. % diffused iron along the bonding zone (interface), a sintered plain bearing material about 0.1 wt. -% diffused iron, while in a plated plain bearing material only about 0.03-0.1 wt. -% of diffused iron could be detected. Moreover, in the method of the invention, the CuPe2P based material to be plated may be heat treated or otherwise modified or optimized prior to the roll plating step

Support layer is affected.

In general, the roll cladding leads to a

However, this disadvantage can be prevented by the fact that in the inventive

Method is carried out after the roll cladding, a step of annealing for recrystallization. The glow to

Recrystallization increases the bonding of the sliding bearing material based on CuFe2P to the steel, since interdiffusion occurs and stresses at the interface are reduced. Despite the occurring interdiffusion occurs

Surprisingly, not to dissolve a significant amount of diffused iron in the matrix of CuFe2P. Between the rolling steps may optionally further

Annealing steps are carried out to further improve bonding while reducing shrinkage

Bearing metal hardness to facilitate the Abbwalzen, In addition, the bond by a higher

 Gesamtumformgrad be improved during the Walzplattiervorgangs. In this case, preference is given to working with a Gesamtumformgrad of up to 80%, more preferably with a Gesamtumformgrad of 40- 60%. At a higher Gesamtumformgrad also a greater elongation of the material is achieved, resulting in a better material utilization.

In the matrix of the sliding bearing material based on CuFe2? There are hard particles of Fe2P that need not be introduced by special steps. These Hartteiichen lead to a high Äbriebbeständigkeit. They also serve as a chip breaker, whereby the workability of the Material, for example when drilling the bearing,

to improve. The existing Fe2 ~ particles lead to good polishing properties against the counter-rotor and thereby prevent the seizure of the sliding bearing and the possible transfer of bearing material to the counter-rotor and the associated adhesion of the bearing on the counter-rotor.

If the plain bearing material based on CuFe2P is applied by means of hot-roll cladding at a corresponding temperature (preferably more than 600 ° C.), direct recrystallization takes place during the forming. As a result, it is possible to produce a particularly fine-grained microstructure with a homogeneous and fine distribution of the Fe 2 P particles, which leads to an improvement in the mechanical characteristics of the roll-clad alloy. In this embodiment, the separate Rekristallisationsgluhen deleted at the end of the process and. the final rolling to set the final hardness can be done directly, as the hot rolling usually under one

reducing atmosphere (0-30%, preferably 10-20% H2, rest of N2) is carried out in a closed system, thus, a reformation of OxidsChichten on the

Surface of the materials are avoided, so that the

Bond is further improved.

If the strongest possible bond is desired, therefore, the use of hot-rolling plating is preferred. However, as a rule, hot-dip plating results in stronger diffusion processes than cold-whipping plating. Therefore, if prevention of the diffusion of iron into the plain bearing material is the priority

 Kaltwaizplattieren preferred,

If desired, the bond may also be achieved by grinding the cast CuFe2P tape and / or the steel backing layer be improved. Such grinding leads to roughening and thus to a mechanical "hooking" of the materials to be joined. In addition, the grinding eliminates oxide layers on the surface and thus leads to a

Activation of the binding zone.

The process used according to the invention preferably comprises the following steps in the order given; - Casting, in particular by means of continuous casting, such as

Belt Casting, Casting Rolling or Die Casting

 Annealing for homogenization, preferably for 4 to 12 hours at 600-800 ° C;

 - Rolls, optionally in several steps;

 optionally annealing, preferably at 400-60 ° C, to reduce the hardness prior to roll cladding;

 - Walzpiattieren, preferably mitteis warm or

 Cold Roll;

 optionally annealing for recrystallization, preferably 5-20

Minutes at € 00 ~ 800 ° C;

 - optional rollers.

By means of the last rolling step, the hardness of the

Slide bearing material based on CuFe2P can be adjusted. The material becomes harder the bigger the

Rolling degree is selected. When used as a bearing material, the hardness of the invention produced

Plain bearing material preferably 120 HBW 1/5/30 (Brinell hardness according to DIN EN ISO 6506-1) or less, more preferably 100 HBW

 1/5/30 or less. When used as a bushing material, the hardness is preferably 120 HBW 1/5/30 or more, more preferably 140 HBW 1/5/30 or more. In general, a degree of blending of about 5% leads to hardnesses below 100 HBW 1/5/30

Fermentation degree of about 10% results in a hardness of less than or equal to 120 HBW 1/5/30 and a degree of gulling of about 15% to a hardness of less than or equal to 140 HBW 1/5/30. During casting, further hard particles can be introduced into the plain bearing material based on C Fe2P, which reinforce the polishing effect. Suitable hard particles include, for example particles of A1N, Al2O3, NiB, Fe ₂ B, SiC, TiC, WC, W ₂ C, Mo ₂ C, c-BN, oSi ₂ "Si ₃ N _4, Fe ₃ P, Fe ₂ P, Fe3B, Ti0 ₂ and ZrC> 2. In addition, other additives, such as solid lubricants such as hB or graphite, in the

Sliding bearing material based on CuFe2P be introduced.

The advantageous properties of CuFe 2 P as plain bearing material described in DE 10 2009 002 894 A1 therefore remain even when using the method according to the invention.

Claims

Method for applying a matrix based on CuFe 2 P to a support layer, characterized in that the matrix based on CuFe 2 P Walzplattieren is applied. A method according to claim 1, wherein the roll cladding is done by hot roll plating or Kait roll cladding. A method according to claim 1 or 2, wherein the method comprises the steps of:  - casting, in particular by continuous casting; - annealing for homogenization;  - Rolls, optionally in several steps;  - optional annealing;  - Walzplattieren, preferably by means  Hot Roll Plating or Kaitwalzplattieren;  - optional annealing for recrystallization;  - optional rollers. Method according to one of claims 1 to 3, wherein the support layer consists of steel. Process for the preparation of a  Gleitlagerverbundwerkstoff, surround send the method according to one of claims 1 to 4, wherein the Matri based on CuFe2P as a plain bearing material on a Support layer is applied. A method for manufacturing a sliding element or sliding bearing, comprising the method according to one of claims 1 to 4, wherein the matrix is based on CuFe2P is applied as a plain bearing material on a support layer. Sliding bearing composite, obtainable by the method according to claim 5. Sliding element or sliding bearing, obtainable by the method according to claim 6.