Nippon Itf, Inc

Honda Motor Co., Ltd.

Nippon Piston Ring Co., Ltd.

Takehiko Ooshiro

Koji Miyake

Yoshihiro Ito

Hiroyuki Sugiura

Satoshi Yoshida

Takahiro Okazaki

Hideki Moriguchi

Masanori Tsujioka

Akinori Shibata

Eishi Fujimagari

Takeyuki Yamasaki

Hidetoshi Chiba

Shinya Kanazawa

Yukako Fukutani

A hard carbon film that forms a sliding surface of a sliding member, wherein the hard carbon film includes terminal atoms that bond to carbon atoms and has a plurality of protruding shaped parts, part of which protrude from the surface thereof, with the periphery of each of the plurality of protruding shaped parts being terminated by a terminal atom. A manufacturing method for the hard carbon film for producing the hard carbon film on a sliding surface of the sliding member using arc vapor deposition having graphite as the vaporization source, wherein a gas containing the terminal atoms that bond to carbon atoms is introduced, and the plurality of protruding shaped parts is grown on the surface of the hard carbon film while terminating the periphery of the plurality of protruding shaped parts by bonding of the terminal atoms to carbon atoms.

Hard carbon film, manufacturing method for same, and sliding member

A sliding member () including a coating film () composed of a hard carbon layer on a sliding surface () of a base material (). The coating film has, when a cross section thereof is observed by a bright-field TEM image, a thickness within a range of 1 &#x3bc;m to 50 &#x3bc;m, and is configured by repeating units including black hard carbon layers (B), relatively shown in black, and white hard carbon layers (W), relatively shown in white, and laminated in a thickness direction, and comprise an inclined region, provided on a base material side, where thicknesses of white hard carbon layers (W) of the repeating units gradually increase in a thickness direction, and a homogeneous region\, provided on a surface side of the sliding member, where thicknesses of the white hard carbon layers (W) of the repeating units are the same or substantially the same in the thickness direction.

Sliding member and coating film

The purpose of the invention is to provide technology, which, in addition to being capable of forming thick hard carbon films of excellent durability even using PVD, is able to establish both chipping resistance and wear resistance in the formed hard carbon film and able to improve low friction properties and peeling resistance. Provided is a coating film to be coated on the surface of a substrate, the coating film having a total film thickness of greater than 1 &#x3bc;m to 50 &#x3bc;m wherein: when a cross-section is observed using bright field TEM images, white hard carbon layers that are shown as relatively white and black hard carbon layers that are shown as black are alternately laminated in the thickness direction; and the white hard carbon layers have regions that have grown in a fan-shape in the thickness direction.

Coating film, manufacturing method therefor, and PVD apparatus

A piston ring in which carbon films with film qualities optimized to be adapted to required performance are formed on an outer circumferential sliding surface and top and bottom surfaces thereof with good productivity is provided, and a high-performance engine which employs the piston ring is also provided. In the piston ring, a carbon film is formed on an outer circumferential sliding surface and top and bottom surfaces. The carbon film contains a stacking of at least two types of carbon film layers with different film qualities, and a thickness ratio of the two types of carbon film layers is different between the outer circumferential sliding surface and the top and bottom surfaces.

Piston ring and engine

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/spof the spbond to the spbond continuously increases from the substrate surface toward the film surface, and a decrease region, in which the ratio sp/spcontinuously decreases, are formed in alternating fashion, a soft film in which the ratio sp/spis low and a hard film in which the ratio sp/spis high are formed so as to be layered in alternating fashion by continuous variation of the ratio sp/spin 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.

Piston ring and method for manufacturing same

Provided are a piston ring which, even when a sleeve constituted of an aluminum alloy is used, can sufficiently show the required low frictional properties, wear resistance, and low counterpart-material attacking properties, and a process for producing the piston ring. The piston ring has a rigid carbon film formed as the outermost layer thereof and serving as a sliding surface with a sleeve constituted of an aluminum alloy, wherein the rigid carbon film gives an X-ray diffraction pattern that has peaks assigned to graphite crystals. The rigid carbon film of the piston ring is formed using a chemical vapor deposition method. The rigid carbon film of the piston ring has a hydrogen content which is at least 20 atm % but lower than 30 atm %, and gives a Raman spectrum in which the ratio of the area (ID) of D-band peaks to the area (IG) of G-band peaks, ID/IG, is 0.5-2.0.

Growing community of inventors

Kyoto, Japan

Takehiko Ooshiro