Mahle International Gmbh

Mahle Metal Leve S/a

Paulo Jose Da Rocha Mordente

Robert Richard Banfield

Juliano Avelar Araujo

Jose Valentim Lima Sarabanda

Edney Deschauer Rejowski

Jose V Sarabanda

Paulo Roberto Vieira De Morais

Nuno Costa

Juliano A Araujo

Samantha Uehara

Davi Antonio Da Silva

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 may include a drawn metal base of constant thickness having an outer peripheral surface. The piston ring may also include a hard coating disposed on the outer peripheral surface. The coating may have a thickness that is greater in a region of two butt ends of the base than a thickness of the coating in another region of the outer peripheral surface. The coating may be defined by a plurality of layers with a nanoscale structure.

Piston ring for an internal-combustion engine, a method for coating a piston ring, and an internal-combustion engine

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.

Piston ring for internal combustion engines

A piston ring for an internal-combustion engine may include a body having a substantially annular external surface and a physical vapor deposition coating layer disposed on the external surface. The body may include a gap defined between a first end and a second end. The piston ring may also include a first half in a region of the gap and a second half opposite the first half. The coating layer of the first half may have a thickness gradient, and the coating layer may define a greater thickness in a vicinity of the first end and the second end and a reduced thickness in regions further away from the vicinity of the first end and the second end. The coating layer of the second half may have a uniform thickness.

Internal-combustion engine piston ring, process for obtaining a piston ring, and internal-combustion engine

A sliding combination for use in an internal combustion engine may include at least one cylinder liner defining an internal sliding surface and a ring having an external lateral sliding surface. The external sliding surface of the ring may slide in relation to the internal sliding surface of the liner. The external sliding surface of the ring may include a first coating of a physical vapor deposited metal nitride in sliding contact with a second coating of a diamond-like carbon (DLC) material disposed on the internal sliding surface of the liner.

Sliding combination for use in an internal combustion engine

A piston ring may include a metallic base, an outer slide layer and an intermediate layer disposed between the base and the outer slide layer. The base may extend between at least two end regions. The outer slide layer and the intermediate layer may be disposed on an outer radial face of each end region of the base.

Piston ring

An element with at least one slide surface with a coating for use on an internal combustion engine may include a base of a metallic alloy and at least one inner surface provided with a hard ceramic coating generated by physical vapor deposition. The element may include a porosity with a rate lower than 2 percent by volume, a Vickers hardness ranging from 1500 to 3000HV, and a compressive inner tension lower than 500 MPa.

Element comprising at least one sliding surface having a coating for use in an internal combustion engine or a compressor

A cylinder for an internal combustion engine may include a metallic cylinder body and an amorphous diamond-like hard carbon film disposed on an internal peripheral surface of the cylinder body. The amorphous diamond-like carbon film may include a roughness ranging from Rz 0.5 &#x3bc;m to Rz 4.0 &#x3bc;m.

Cylinder for application on an internal combustion engine

The present invention relates to an element () that works sliding, of an internal combustion engine and/or a compressor that undergoes friction and receives a coating of chrome nitride having an equiaxial morphology, with low porosity (lower than 1%) and with a crystallographic orientation predominantly (111), maintaining some reticulate in the orientation (200), so as to improve its resistance to wear and its toughness, prolonging the useful life of the element () that works sliding.

Element provided with at least one slide surface for use on an internal combustion engine

The present invention has the objective of solving the problems encountered in coating engine components (engine blocks or sleeves, either fixed or movable) having at least one cylindrical cavity and composed mainly by iron or aluminum, providing them with a coating () that is subdivided into three different layers, which are deposited onto the metallic substrate (), which are first sub-layer () comprising at least 80% silicon deposited onto the substrate () with the function of providing interface with good adhesion between the substrate () and the subsequent sub-layers, which contain hydrogenated amorphous carbon, second sub-layer () of transition comprising a percentage of silicon and of hydrogenated amorphous carbon (a-C:H:Si) and, finally, on the working surface, third sub-layer () having a pure composition of hydrogenated amorphous carbon (a-C:H), wherein such coating () is generated by the hollow cathode effect (HCE) by plasma-enhanced chemical vapor deposition (PECVD).

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Jundiai, Brazil

Paulo Jose Da Rocha Mordente