Provided is a piston ring having excellent low-friction properties and abrasion resistance manufactured without the need for precision control using an ordinary film formation device that does not have a special function. A piston ring obtained by coating an amorphous carbon film on the surface of a ring-shaped substrate, the piston ring being configured so that the amorphous carbon film is formed by CVD, an increase region, in which the ratio sp.sup.2/sp.sup.3 of the sp.sup.2 bond to the sp.sup.3 bond continuously increases from the substrate surface toward the film surface, and a decrease region, in which the ratio sp.sup.2/sp.sup.3 continuously decreases, are formed in alternating fashion, a soft film in which the ratio sp.sup.2/sp.sup.3 is low and a hard film in which the ratio sp.sup.2/sp.sup.3 is high are formed so as to be layered in alternating fashion by continuous variation of the ratio sp.sup.2/sp.sup.3 in the boundary between the increase region and the decrease region, and the decrease regions are formed in equal number to or with one region less than the number of increase regions.

A sliding element, such as a piston ring, including a substrate, base coating, and relatively thin sliding coating is provided. The base coating is typically applied to a running surface of the substrate by PVD, CVD, galvanic deposition, electrodeposition, or a thermal spray process. The sliding coating includes a polymer matrix and hard particles disposed throughout the matrix. The sliding coating is applied to the base coating when the base coating is still in its as-applied condition and has a surface roughness of at least 4.0 m. During use of the sliding element, the thin sliding coating acts as a sacrificial run-in layer. In addition, as the polymer matrix of the sliding coating wears away, the hard particles polish the rough surface of the base coating. Thus, polishing or lapping of the as-applied base coating prior to use of the sliding element is not required.

A sliding element, such as a piston ring, including a substrate, base coating, and relatively thin sliding coating is provided. The base coating is typically applied to a running surface of the substrate by PVD, CVD, galvanic deposition, electrodeposition, or a thermal spray process. The sliding coating includes a polymer matrix and hard particles disposed throughout the matrix. The sliding coating is applied to the base coating when the base coating is still in its as-applied condition and has a surface roughness of at least 4.0 m. During use of the sliding element, the thin sliding coating acts as a sacrificial run-in layer. In addition, as the polymer matrix of the sliding coating wears away, the hard particles polish the rough surface of the base coating. Thus, polishing or lapping of the as-applied base coating prior to use of the sliding element is not required.

A sliding element, such as a piston ring, including a substrate, base coating, and relatively thin sliding coating is provided. The base coating is typically applied to a running surface of the substrate by PVD, CVD, galvanic deposition, electrodeposition, or a thermal spray process. The sliding coating includes a polymer matrix and hard particles disposed throughout the matrix. The sliding coating is applied to the base coating when the base coating is still in its as-applied condition and has a surface roughness of at least 4.0 m. During use of the sliding element, the thin sliding coating acts as a sacrificial run-in layer. In addition, as the polymer matrix of the sliding coating wears away, the hard particles polish the rough surface of the base coating. Thus, polishing or lapping of the as-applied base coating prior to use of the sliding element is not required.

The present invention relates to a method for coating a substrate, preferably a drill, wherein at least one first HiPIMS layer is applied by means of a HiPIMS process. Preferably, at least one second layer is applied to the first HiPIMS layer by means of a coating process that does not contain a HiPIMS process.

Embodiments of the present disclosure provide a film and a forming method thereof. The forming method includes: providing a base; forming a diamond-like carbon film on the base, where the DLC film has carbon-hydrogen chemical bonds; and performing photocatalytic treatment on the DLC film, to break at least some of the carbon-hydrogen chemical bonds and reduce content of hydrogen elements in the DLC film.

Thermally conductive coatings are deposited on an inner surface of a particle containment chamber to mitigate excessive heating of the inner surface. A particle manipulation system includes a particle containment plasma containment chamber with a thermally-conductive coating comprising bort, graphite, and/or diamond on the inner surface of the chamber. The coating material and thickness can be selected to absorb a majority of energetic radiation (such as X-rays) incident on the coating and transport heat generated by the absorbed X-rays away from the inner surface of the chamber. Methods of deposition, including in situ deposition, are also described.

According to an embodiment of the present invention, there is provided a device for forming at least a diamond film on a surface of a substrate, the device comprising: a container configured to hold a raw material liquid and to place the substrate in the raw material liquid; an electrode part comprising a positive electrode and a negative electrode and configured to generate a plasma in the raw material liquid; a raw material gas supply part and a carrier gas supply part, each of the raw material gas supply part and the carrier gas supply part being connected to the electrode part; and a power source configured to apply a voltage to the electrode part, wherein the power source is a direct current power source, and the electrode part further comprises an adjunctive member, and the adjunctive member is attached to an electrode at a plasma generation region of the electrode part.

The present invention relates to a carbon coating method for a rubber roller, in which a DLC (Diamond-Like Carbon) coating is applied to the surface of the rubber roller using an ion source. In order to prevent problems such as surface cracks caused by heat and ultraviolet radiation generated during the plasma-based coating process, the method controls the coating cycle by distributing the coating time and aging time (also referred to as cooling time) into a single unit coating cycle.