Mahle International Gmbh

Mahle Metal Leve S/a

Eliel Dos Santos Paes

Juliano Avelar Araujo

A sliding element for an internal combustion engine may include a base material having an annular external surface. The external surface may include a bonding layer, a first layer of coating, and a second layer of coating sequentially disposed thereon. The first layer of coating and the second layer of coating may include hard amorphous carbon (DLC) of a combined matrix having a plurality of sp3/sp2 bonds. The first layer of coating may include 45% sp3 bonds or less and may have a thickness of at least 10 micrometers. The second layer of coating may include at least 55% sp3 bonds and may have a thickness of at least 3 micrometers.

Sliding element for an internal combustion engine

A sliding element, for example a piston ring for an internal combustion engine, may include a sliding face, an adhesive layer disposed on the sliding face, and a coating disposed over the adhesive layer. The coating may be composed of an amorphous carbon material. The coating may have a ratio between spbonds and spbonds that indicates a predominance of spbonds. The coating may have a roughness profile including a value of Rpk of &#x2264;0.15 &#x3bc;m and a value of Rz of 0.7&#x2264;Rz&#x2264;1.5 &#x3bc;m.

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Jundiai, Brazil

Eliel Dos Santos Paes