Patent ID: 8734603
Filing Date: 2014-05-27
Classification: C21D,C23C,F16D

Abstract:
1. A method for producing a friction element comprising the steps: providing a metal main body, hardening the main body on at least one part of its surface in a salt bath, the salt bath comprising a mixture of different salts, forming several different oxides in discrete areas on the surface of the main body, the different oxides being present in respective discrete areas next to one another, wherein the discrete areas have a maximum diameter in plan view which is selected from a range with a lower limit of 50 μm and an upper limit of 300 μm and wherein the discrete areas are designed to be at least partly crater-shaped with a crater depth of between 2 μm and 20 μm, and forming a hardened surface comprising salt residues from the salt bath, wherein the salt residues are located within the discrete areas, and wherein the salt bath hardening is the final step of the method and there is no further processing of the hardened surface.