SLIDING BEARING, SLIDING BEARING MATERIAL, METHOD FOR PRODUCING A SLIDING BEARING MATERIAL AND USE OF A SLIDING BEARING MATERIAL FOR A SLIDING BEARING

Abstract

The present application relates to a sliding bearing material comprising a steel substrate back and an aluminum alloy applied thereto, characterized in that the aluminum alloy contains an aluminum alloy matrix and hard particles, preferably 0.01 to 10 wt %, and/or fibers, preferably 0.01 to 50 vol %. The invention further relates to a method for producing a sliding bearing material, to the use of a sliding bearing material for a sliding bearing and to a sliding bearing.

Claims

1. Sliding bearing material comprising a steel substrate back and an aluminum alloy applied thereon, wherein the aluminum alloy contains an aluminum alloy matrix, hard particles in an amount, 0.01 to 10 wt %, fibers in an amount of, 0.01 to 50 vol % and 0.01 to 54 wt %, and the steel substrate back consists of one of the steels C06, C10, C22 or CXX (wherein XX>22), wherein, the aluminum alloy matrix is lead-free and/or comprises one or more of the following alloy elements: up to 3 wt % respectively of Cu, Mn, Mg, Si, Fe, V, Ti, Sc, Cr, Zn and/or Ni; up to 15 wt % Sn; up to 0.2 wt %, preferably 0.02 to 0.05 wt % Sr, boron, TiB.sub.2 and/or Na; and the balance aluminum with up to 0.5 wt % inevitable impurities; wherein the hard particles are selected from a group of carbides, nitrides, borides and/or oxides and the hard particles exhibit a size <20 m and the fibers are selected from a group of organic and/or inorganic fibers, and the fibers exhibit a length <50 m and a diameter <3 m, in the form of nanotubes.

2. The sliding bearing material according to claim 1, wherein the aluminum alloy contains lubricant.

3. The sliding bearing material according to claim 1, wherein the fibers have a higher tensile strength and/or a higher modulus of elasticity and/or a lower fracture elongation in the longitudinal direction than the aluminum alloy matrix.

4. The sliding bearing material according to claim 1, wherein an intermediate layer is provided between the steel substrate back and the aluminum alloy, said intermediate layer preferably consisting of an aluminum alloy of the 1xxx, 2xxx or 3xxx alloy series.

5. (canceled)

6. A sliding bearing, consisting, at least partially, of a sliding bearing material according to claim 1.

7. A method for producing a sliding bearing material according to claim 1, wherein the aluminum alloy is applied to the steel substrate back by hot roll cladding or cold roll cladding.,

8. The method for producing a sliding bearing material according to claim 7, wherein an aluminum foil consisting of an aluminum alloy of the 1xxx, 2xxx or 3xxx alloy series is first of all applied, to the steel substrate back before the roll cladding.

9. The method for producing a sliding bearing material according to claim 8, wherein the aluminum alloy undergoes at least one homogenization and/or recrystallization heat treatment in the temperature range of 200 C. 600 C. with a holding time of 1-30 h before the roll cladding.

10. The method for producing a sliding bearing material according to claim 7, including: transforming the alloy elements, hard particles and/or fibers of the aluminum alloy into a melting bath; continuous casting the melt into a strand with substantially rectangular cross-section, heat treatment of the strand, rolling the strand heat treatment of the rolled strand and roll cladding the aluminum alloy onto a steel substrate back.

11. The sliding bearing of claim 1, wherein the group of carbides, borides and/or oxides is selected from the group TiC, MoC, AIN, c-BN, TiB.sub.2, and/or Y.sub.2O.sub.3.

12. The sliding bearing of claim 1, wherein the group of carbides, borides and/or oxides is selected from the group SiC, Si.sub.3N.sub.4, ZrO.sub.2, and or Al.sub.2O.sub.3.

13. The sliding bearing of claim 1, wherein the fibers are glass fibers and/or Al.sub.2O.sub.3.

14. The sliding bearing of claim 1, wherein the fibers are selected from the group of SiC; carbon and/or Al.sub.2O.sub.3 fibers.

15. The sliding bearing of claim 2 wherein the lubricant comprises h-BN and/or graphite.

16. The sliding hearing of claim 15 wherein the lubricant has a concentration of 0.01 to 10 wt %.

17. The method of claim 8, wherein the aluminum foil is roll cladded.

Description

PREFERRED EMBODIMENT

[0028] According to a preferred embodiment, the alloy elements of the aluminum alloy matrix, namely approximately 0.05 wt % Sr, approximately 14.0 wt % Sn, approximately 1.0 wt % copper and the rest being aluminum and inevitable impurities, and approximately 5 wt % SiC hard particles and approximately 20 vol. % Al.sub.2O.sub.3fibers are transformed into a molten pool at a temperature of 800 C. The weight data given for the alloy elements refer to the aluminum alloy matrix. The specified percentage by volume of fibers can be converted into a corresponding percentage by weight via the known density of the fibers. At the said melting temperature, the hard particles and fibers remain in the solid phase and convection ensures fine and homogenous distribution of the hard particles and fibers in the melt The aluminum alloy is then cast into a strand of rectangular cross-section by means of continuous casting. The aluminum alloy matrix is homogenized by homogenization heat treatment at approximately 450 C. and holding time of 16 h, so that the strand can be rolled to a thickness of 1.1 mm in the subsequent rolling steps due to its reduced strength. The aluminum alloy is then applied to a C06 steel by means of hot roll cladding. Due to dynamic recrystallization during hot roll cladding, high levels of deformability and thus excellent bonding can be achieved between the steel substrate and the aluminum alloy. In order to improve adhesion between substrate and aluminum alloy, the respective surfaces are ground and brushed prior to the hot roll cladding. Ultimately, a bearing shell is made out of the sliding bearing material by means of the usual forming steps and surface finishing.