PLAIN BEARING OR PART THEREOF, METHOD FOR PRODUCING SAME AND USE OF A CUCRZR ALLOY AS A PLAIN BEARING MATERIAL

Abstract

The present application relates to a plain bearing, or a part thereof and to a method for producing same, characterised in that the plain bearing at least partially consists of a CuCrZr alloy. The application also relates to the use of the CuCrZr alloy as a plain bearing material.

Claims

1. A plain bearing or part thereof comprising a CuCrZr alloy which has a porosity of <0.3 volume percent.

2. The plain bearing or part thereof according to claim 1, wherein the CuCrZr alloy consists of 0.01 to 0.5% by weight Zr, 0.01 to 4.9% by weight Cr, and also copper as remainder and up to 0.5% by weight unavoidable impurities.

3. The plain bearing or part thereof according to claim 2, wherein the CuCrZr alloy additionally contains 0.01 to 15.0% by weight Sn.

4. The plain bearing or pad thereof according to claim 2, wherein the CuCrZr alloy additionally contains Al, Mg, Ti and/or Mn in a concentration range of 0.15 to 0.25% by weight in each case.

5. The plain bearing or part thereof according to claim 2, wherein the CuCrZr alloy has further functional additions such as solid lubricants, preferably h-BN and/or graphite, hard particles, preferably oxides, carbides, nitrides and/or phosphides, chip breakers, preferably tellurium, bismuth, lead and/or sulphur, and/or corrosion inhibitors.

6. The plain bearing or part thereof according to claim 1, wherein the CuCrZr alloy is applied to a substrate backing.

7. A method for producing a plain bearing or a part thereof according to claim 1, which is manufactured at least partially from a CuCrZr alloy, with at least part of the plain bearing, preferably the CuCrZr alloy, being subjected to heat treatment, preferably solution annealing, hot age-hardening and/or soft annealing.

8. The method for producing a plain bearing or a part thereof according to claim 7, wherein functional additions such as solid lubricants, preferably h-BN and/or C, hard particles, preferably oxides, carbides, nitrides and/or phosphides, chip breakers, preferably tellurium, bismuth, lead and/or sulphur, and/or corrosion inhibitors are introduced.

9. The method for producing a plain bearing or a part thereof according to claim 7 wherein the CuCrZr alloy is processed as a solid material.

10. The method for producing a plain bearing or a part thereof according to claim 7 wherein the CuCrZr alloy is applied to a substrate backing.

11. The method for producing a plain bearing or a part thereof according to claim 10, wherein the CuCrZr alloy is applied to the substrate backing by roll bonding cladding, a galvanic process and/or a sputtering process.

12. The method for producing a plain bearing or a part thereof according to claim 7, wherein the CuCrZr alloy is formed by a sintering process, consisting of at least one, preferably two, sintering operations.

13. The method for producing a plain bearing or a part thereof according to claim 12, wherein at least one, preferably each, sintering operation is followed by at least one roll pass.

14. The method for producing a plain bearing or a part thereof according to claim 7, wherein the sintering takes place at temperatures of 950° C. to 1000° C.

15. The method for producing a plain bearing or a part thereof according to claim 8, wherein the functional additions such as solid lubricants, preferably h-BN and/or C, hard particles, preferably oxides, carbides, nitrides and/or phosphides, chip breakers, preferably tellurium, bismuth, lead and/or sulphur, and/or corrosion inhibitors are introduced via a preceding grinding and mixing process.

16. The method for producing a plain bearing or a part thereof according to claim 7, wherein the CuCrZr alloy is a sintering powder produced by an atomisation process, preferably of pure elements and/or the prealloys thereof.

17. The method for producing a plain bearing or a part thereof according to claim 16, wherein the sintered powder is made from chips occurring in the production of cast CuCrZr.

18. The method for producing a plain bearing or a part thereof according to claim 16, wherein the sintering powder has a fines fraction <5 μm of over 5% by weight.

19. The method for producing a plain bearing or a part thereof according to claim 7, wherein the CuCrZr alloy is processed by a casting process.

20. The method for producing a plain bearing or a part thereof according to claim 7, wherein at least part of the plain bearing, preferably the CuCrZr alloy, is mechanically processed.

21. (canceled)

22 The plain bearing or part thereof according to claim 1, wherein said Cr is present in the range of 0.01 to 4.4% by weight.

23. The plain bearing or part thereof according to claim 6, wherein said substrate comprises a steel backing.

24. The method for producing a plain bearing or a portion thereof according to claim 10, wherein the substrate is selected as a steel backing.

25. The method for producing a plain bearing or a portion thereof, according to claim 14, wherein the sintering takes place at a temperature of 950° C. to 980° C.

26. The method for producing a plain bearing or a portion thereof, according to claim 18, wherein the fines fraction is at least 10% by weight.

Description

PREFERRED EMBODIMENT

[0031] According to a preferred embodiment, a plain bearing, consisting of a steel backing and a sinter layer of a CuCrZr alloy applied thereon, is provided. To produce it, initially a sintering powder mixture having the percentages by weight 1.0% by weight Cr and 0.1% by weight Zr, and also copper as remainder is produced. To this end, pure substances of the alloying elements are atomised using an atomisation installation such that a fines fraction <5 μm of 10% by weight results. The sintering powders are mixed, compacted on a steel backing and sintered at a temperature of 950° C.. After the first sintering operation, there follows a roll pass and also a second sintering operation at 950° C., which is again followed by a second roil pass, so that a material with a homogeneous structure and a porosity of less than 0.3 volume percent results.