Mahle International Gmbh

Oerlikon Surface Solutions Ag, Pfaffikon

Monika Lehnert

Kurt Maier

Beno Widrig

Juergen Ramm

Reinhard Rose

The invention relates to a component having a coating containing chromium, nitrogen and carbon, which component is characterized in that the coating comprises a sliding layer having a ceramic phase and an amorphous phase. According to the invention the ceramic phase forms a crystalline ceramic matrix from Crx(CN) with 0.8=x=1.2 and y&#x3e;0.7, and the amorphous phase consists of carbon particles that are embedded in substantially uniform distribution in the crystalline ceramic matrix.

Component having a coating and method for the production thereof

The invention relates to a component having a coating containing chromium, nitrogen and carbon. According to the invention the coating comprises a sliding layer having a ceramic phase and a carbon phase, the ceramic phase forms a crystalline ceramic phase from Crx(CN) with 0.8=x=1.2 and y&#x3e;0.7, and the crystalline ceramic phase and the carbon phase form a layer system of alternating individual layers (A, B), wherein the carbon phase has interstices that are filled with the crystalline ceramic phase.

A steel piston for an internal combustion engine may include a piston crown and a protective layer disposed on the piston crown. The protective layer may include an adhesion layer of Cr or CrN, which is present on a surface of the piston crown. The protective layer may include a functional layer, which is present on the adhesion layer. The functional layer may have at least one of (i) at least one layer (A) of CrN and (ii) at least one layer (B) of CrOn in the form of [(A)/(B)], and a may represent 1 to 100.

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Remseck, Germany

Monika Lehnert