Method of producing an anti-wear layer and anti-wear layer produced by means of said method
AssigneesFraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., H-O-T Haerte- Und Oberflaechentechnik GmbH & Co. KG
InventorsAndreas Leson, Hans-Joachim Scheibe, Frank-Peter Bach
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Abstract
The invention relates to the production of wear-resistant layers which are exposed to friction wear on surfaces of components of internal combustion engines. In the process, wear-resistant layers are formed on the respective surface by electric arc discharge under vacuum conditions. The wear-resistant layers are formed from at least approximately hydrogen-free tetrahedrally amorphous (ta-C) comprising a mixture of sp2 and sp3 hybridized carbon and have a microhardness of at least 3500 HV and an arithmetical mean roughness value Ra of 0.1 μm without a mechanical, physical and/or chemical surface processing taking place.
Claims11
A method of producing wear-resistant layers on surfaces of components of internal combustion engines which are exposed to frictional wear, wherein a plasma is formed by means of pulse-operated laser radiation from sequentially ignited electrical arc discharges under vacuum conditions, wherein the electrical arc discharge is operated between an anode (6) and a cathode (10) of graphite and ionized parts of the plasma are deposited on a surface of at least one component (14) as a layer which is formed from at least approximately hydrogen-free tetrahedrally amorphous (ta-C) comprising a mixture of sp2 and sp3 hybridized carbon,
- wherein the method further comprises deflecting the plasma by an absorber electrode (5) such that positively charged ions of the plasma are deflected in the direction of the at least one component (14) by applying at least approximately the same electric voltage at the anode (6) and at the absorber electrode (5) as the electrical arc discharges and providing an electric current flow through the absorber electrode (5) which is at least 1.5 times greater than the electric current flow through the anode (6), and
- wherein said coated surface of the at least one component (14) is free of any mechanical and/or chemical machine finishing.
Dependencies are inferred from the claim text.