Abstract: 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 sp3 to sp2 ranging 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%.

Abstract: 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.

Abstract: 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 sp3 to sp2 ranging 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%.

Abstract: 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 vapour 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.

Abstract: The present invention refers to a piston ring, particularly for use in the piston channel of an internal combustion engine or a compressor, comprising at least a substantially ring-shaped metallic base (2) having at least a first region (20), at least a second region (21) and at least a gap (22), the first region (20) being positioned in a way substantially opposite to the gap (22), the ring comprising at least a nitrided layer (3) in the second region (21) and comprising at least reduction of the nitrided layer (3) in the first region (20), whereas the reduced nitrided layer (3) is at least partially blocked in the first region (20) due to the previous application of an intermediate layer (4).

Abstract: The present invention refers to a piston ring, particularly for use in the piston channel of an internal combustion engine or a compressor, comprising at least a substantially ring-shaped metallic base (2) having at least a first region (20), at least a second region (21) and at least a gap (22), the first region (20) being positioned in a way substantially opposite to the gap (22), the ring comprising at least a nitrided layer (3) in the second region (21) and comprising at least reduction of the nitrided layer (3) in the first region (20), whereas the reduced nitrided layer (3) is at least partially blocked in the first region (20) due to the previous application of an intermediate layer (4).

Abstract: 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: (a) an oxygen content in solid solution of 0.5 to 2.5 wt %; (b) a content of uniformly dispersed micro-pores of less than 10% in volume of the coating; and (c) an X-ray diffraction intensity ratio of (111) planes to (200) planes parallel to the surface in the range of 0.80 to 1.20.

Abstract: 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: (a) an oxygen content in solid solution of 0.5 to 2.5 wt %; (b) a content of uniformly dispersed micro-pores of less than 10% in volume of the coating; and (c) an X-ray diffraction intensity ratio of (111) planes to (200) planes parallel to the surface in the range of 0.80 to 1.20.

Abstract: A piston ring for internal combustion engines with a coating of Chromium nitride (CrN) deposited by a physical vapor deposition process on a sliding surface with a typical crystal structure of CrN phase, has a high wear resistance and superior resistance to the generation of micro-cracks and consequent localized loss of pieces of the coating. The coating is a columnar crystalline coating of CrN having a dispersed pore content lower than 10% in volume and ratio of intensities, measured through x-ray diffraction, between the crystal planes (111) and planes (200), parallel to the surface, in the range of 0.40 to 0.70. This crystalline distribution is obtained through an oxygen content impregnated in the CrN coating between 1.0% in weight to 7.0% in weight. The Vickers hardness of the film ranges from 1,500 to 2,200 HV.

Abstract: Multilayer sliding bearing, of the type comprising: an intermediate layer (20) made of a material with a certain hardness, disposed on a backing layer (10); a sliding layer (30) made of a less hard material, said intermediate layer (20) presenting a radially internal face defined by at least a pair of surfaces, which are excentric to the bearing and which intercept each other along a respective intersection line (22) of the bearing that is inclined relative the opposite end edges, in order to reduce the thickness of said intermediate layer (20), the radially internal face of the sliding layer (30) presenting a curvature radius at maximum equal to the distance between the axis of the bearing and each point of each intersection line (22).