Federal-mogul Burscheid Gmbh

Wilmington Trust, National Association, As Collateral Trustee

Christiane Bauer

Ralf Lammers

Manfred Fischer

Steffen Hoppe

Jörg Vetter

Yuriy Ivanov

Manfred Muller

Reiner Waller

Yurly Ivanov

Manfred MÜLLER

A sliding element, in particular a piston ring has an outer circumferential running surface of the piston ring, has no nitriding layer, preferable no surface hardening the running surface has as an outermost layer, which differs from the intermediate layer, a DLC layer or a metal-based nitride layer, preferable a metal nitride layer, preferably a CrN layer. Provided between the substrate of the sliding element and the DLC layer there is at least one metal-containing intermediate layer, preferably a metal layer, particularly preferable a chromium layer, and at least one further surface of the sliding element, preferably the piston ring flanks, is surface-hardened, preferably has a nitriding layer.

Sliding element, in particular piston ring, and method for producing the same

A piston ring is produced in which a piston ring base body made of cast iron or cast steel is coated with at least one PVD layer having a variable layer thickness, such that an increased layer thickness is present in the region of the ring ends compared to the remaining circumferential region of the piston ring base body, wherein the piston ring base body is configured so that, in the cold operating state with the engine not running, the radial pressure distribution of the piston ring base body is such that the ring ends exhibit substantially no radial pressure across a defined circumferential angle, and the variable layer thickness of the PVD layer is set so that a substantially uniform radial pressure distribution is present along the entire ring circumference of the piston ring at a piston ring temperature above 150&#xb0; C.

Method for producing piston a ring

The invention relates to a piston ring which is produced from a carrier material, especially steel or a cast material. The piston ring has a wear-resistant coating from a periodic multilayer system, every periodicity consisting of at least two individual metal nitride layers. The multilayer system has superlattice structures, the thickness of an individual layer being &#x2265;2 nm to &#x3c;15 nm and the thickness of the multilayer system being &#x3e;4.5 &#x3bc;m and adjacent individual layers within the periodicity having different metallic elements.

Piston ring for internal combustion engines

Disclosed is a piston ring () having a substrate () to which a wear resistant coating () is applied that includes at least one first element with a melting point T&#x2266;700&#xb0; C. The wear resistant coating () contains at least one second element with a melting point T&#x3e;760&#xb0; C. The wear resistant coating also includes droplets () which have a diameter (D) and which contain at least the first element, wherein at least 90% of the droplets () have a value 1 &#x3bc;m&#x2266;D&#x2266;10 &#x3bc;m. In the method for producing a wear resistant coating () using an arc evaporation technique, the target material includes at least one first element with a melting point T&#x2266;700&#xb0; C. and at least one second element with a melting point T&#x3e;760&#xb0; C., wherein the quantity of the second material contained in the target material is such that the melting point (T) of the target material &#x2267;1000&#xb0; C.

Piston ring

The invention relates to a piston ring which is produced from a carrier material, especially steel or a cast material. The piston ring has a wear-resistant coating from a periodic multilayer system, every periodicity consisting of at least two individual metal nitride layers. Adjacent individual layers within the periodicity have different metallic elements. The thickness of an individual layer is &#x2267;15 nm.

In order to avoid burn traces on piston rings, it is proposed to provide the piston ring with a wear-protection coating which consists of a material with a thermal conductivity of at least 180 W/(m&#xb7;K). At least 5% vol. of the wear-protection coating consists of aluminum nitride.

Disclosed is a piston ring comprising a supporting material and a wear-resistant coating. The wear-resistant coating is composed of a ternary system A-B&#x2014;N which is applied using a PVD process and in which A and B each represent an element form the group encompassing Ti, Zr, Hf, V, Nb, Ta, Cr, Mo W, Al, Si and C, wherein A&#x2260;B and N represents nitrogen. The thickness of the wear-resistant coating amounts to &#x2267;3 &#x3bc;m.

A sliding element comprises at least one surface for sliding contact with a running face, wherein a wear layer and a run-in layer made from carbon are applied to the surface, and is characterized in that the run-in layer comprises hydrogen and nanocrystalline carbide phases. In a method for manufacturing a sliding element, the run-in layer is applied by means of a PVD process. A sliding system has an above-described sliding element and a body having a running face. A coating for a sliding element comprises a wear layer which can be applied to the upper side of the sliding element, and a run-in layer which is configured as a carbon layer, and is characterized in that the run-in layer comprises hydrogen and nanocrystalline carbide phases.

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Burscheid, Germany

Christiane Bauer