Mahle Metal Leve S/a

Mahle International Gmbh

Juliano Avelar Araujo

Robert Richard Banfield

Paulo Jose Da Rocha Mordente

Jose Valentim Lima Sarabanda

Gisela Ablas Marques

Nuno Costa

Eliel Dos Santos Paes

Paulo José Da Rocha Mordente

José Valentim Lima Sarabanda

Gisela Ablas Marquez

A sliding element may include a base material having an annular external surface upon which a bonding layer and a sliding layer are sequentially deposited. The sliding layer may be composed of hard amorphous carbon of a combined matrix with sp3/sp2 bonds. The sliding layer may include a plurality of nanoparticles of graphite incorporated within the combined matrix of sp3/sp2.

Sliding element for internal combustion engines

A piston ring for internal combustion engines provided with a ferrous alloy base includes an annular outer surface on which a coating including at least one outer layer is applied deposited on an adhesive layer, the outer layer being provided with a variable thickness, in such a way that the thickness of the outer layer gradually increases from 90&#xb0; and 270&#xb0; towards 0&#xb0; and 360&#xb0; respectively, with the thickness attaining its maximum value in the region of 10&#xb0; and 350&#xb0; and slightly decreasing towards 0&#xb0; and 360&#xb0; so as to ensure an optimal working condition, minimizing the contact pressure and consequently the accelerated wear in the vicinities of the ends of the ring, in addition to preventing and/or impeding the detachment of the outer layer of the coating.

Piston ring for internal combustion engines

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.

Sliding element

A piston ring for an internal combustion engine may include a substantially annular base of a ferrous alloy upon which is applied a coating. The coating may have a first bonding layer and at least a first external layer or a second external layer deposited upon the first bonding layer up to a maximum of 100 micrometers in thickness of a plurality of sequentially deposited first and second external layers. The first external layer may include a nitride of a doped metal chemical element, a doping element being aluminum. The second external layer may include a nitride of the metal chemical element. The first external layer may have a thickness greater than at least once a thickness of the second external layer and less than ten times the thickness of the second external layer.

A sliding element for internal combustion engines may include a sliding face upon which are deposited, from the sliding face outwards, an adhesive layer and a coating of hard amorphous carbon. The coating may present a proportion of spto spranging from 0.42 to 2.33 and at least one of an Rmr (0.2-0.5) profile greater than at least 25% and/or an Rmr (0.3-0.5) profile greater than at least 50%.

A sliding element for internal combustion engines may include a ferrous base provided with a film applied upon a sliding surface. The film may have, sequentially, a metal connecting layer, a transitional layer, and a contact layer. The transitional layer may include a carbide containing a metal element. The contact layer may contain DLC (diamond-like carbon) doped with the metal element of the transitional layer, the DLC containing a maximum of 2% hydrogen by weight. An atomic ratio between metal and carbon in the contact layer in terms of a ratio Me/C is equal to or less than 0.1.

Sliding element, internal combustion engine and process for obtaining sliding element

The present invention refers to a piston ring for internal combustion engine, having an outer surface of a coating of Chromium Nitride (CrN and Cr2N) and Niobium Nitride (NbN and Nb4N3), capable of offering greater resistance to peeling of the coating, also maintaining an excellent level of resistance to wear and tear and scratches to the layer of Chromium Nitride deposited.

Piston ring for internal combustion engine

A sliding component for an internal combustion engine may include a ferrous base having a peripheral sliding surface covered with a protective layer including at least one of a nitride applied via physical vapor deposition and a nitrided layer. The base may include a coating of carbon of a diamond-like carbon type. The coating may include at least one of (i) a transition layer including a composition of WCand (ii) a layer of metallic chromium of crystalline structure disposed between the ferrous base and an outer layer of amorphous carbon. The coating may also include an intermediate layer of a nanocrystalline phase of carbides in a multilayer structure having a first sub-layer including a composition different than a second sub-layer disposed under the outer layer.

Sliding component for use in an internal combustion engine

The present invention refers to a piston ring for internal combustion engine, having an outer surface of a coating of Chromium Nitride (CrN and CrN) and Niobium Nitride (NbN and NbN), capable of offering greater resistance to peeling of the coating, also maintaining an excellent level of resistance to wear and tear and scratches to the layer of Chromium Nitride deposited.

The invention relates to a piston ring for internal combustion engines, the piston ring comprises a steel or cast iron base material with a coating of chromium nitride deposited by a physical vapor deposition process on a sliding surface of the piston ring, wherein the coating is composed of a columnar crystal structure of CrN with the following features:

Piston ring with chromium nitride coating for internal combustion engines

The present invention relates to a piston ring for an internal combustion engine, the piston ring comprises a sulphide rich compound layer forming a surface layer, said sulphide rich compound layer comprising an iron nitride matrix with iron sulphide (FeS) inclusions embedded in said matrix, said sulphide rich compound layer having a sulphur content of 1 to 4 wt % S and a nitrogen content of 10 to 20 wt % N.

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Jundiai, Brazil

Juliano Avelar Araujo