Title:
PISTON RING AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2015/115601
Kind Code:
A9
Abstract:
The present invention addresses the problem of providing a piston ring having a hard carbon film exhibiting exceptional wear resistance and initial conformability, and a manufacturing method therefor. This problem is solved by a piston ring (10) having a hard carbon film (4) formed on at least an external peripheral sliding surface (11) of a piston ring base material (1), the hard carbon film (4) having a sp2 component ratio within a range of 40% to 80% inclusive as measured by a TEM-EELS spectrum which combines electron energy loss spectroscopy (EELS) with a transmission electron microscope (TEM), the hydrogen content being in a range of 0.1 at.% to 5 at.% inclusive, and the amount of macroparticles appearing on the surface being in a range of 0.1% to 10% inclusive by area ratio. The hard carbon film (4) is formed on a hard carbon foundation film (3) formed under low-speed film-forming conditions on the side of the piston ring base material (1), and the hard carbon foundation film (3) is formed with an arc current value 80% or less of the arc current value during the formation of the hard carbon film (4).
Inventors:
OZAKI TAKUYA (JP)
SUGIURA HIROYUKI (JP)
SUGIURA HIROYUKI (JP)
Application Number:
PCT/JP2015/052680
Publication Date:
June 02, 2016
Filing Date:
January 30, 2015
Export Citation:
Assignee:
NIPPON PISTON RING CO LTD (JP)
International Classes:
F16J9/26; F02F5/00
Attorney, Agent or Firm:
YOSHIMURA, SHUNICHI (JP)
Toshikazu Yoshimura (JP)
Toshikazu Yoshimura (JP)
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