Title:
ピストンリング及びその製造方法
Document Type and Number:
Japanese Patent JP6718452
Kind Code:
B2
Abstract:
To provide a piston ring comprising a hard carbon film that is easy to form and exhibits excellent wear resistance. The above-described problem is solved by having a hard carbon film 4 formed on at least an outer peripheral sliding surface 11 of a piston ring base material 1, wherein the hard carbon film 4 is a laminated film comprising a plurality of layers, and is configured so as to contain boron within a range of an atomic density of 0.2 x 10 22 atoms/cm 3 to 2.0 x 10 22 atoms/cm 3 inclusive. This hard carbon film 4 may be configured to have an sp 2 component ratio within a range of 40% to 80% inclusive, measured in a TEM-EELS spectrum formed by combining electron energy loss spectroscopy (EELS) with a transmission electron microscope (TEM), and a hydrogen content within a range of 0.1 atom% to 5 atom% inclusive. Further, a total thickness of this hard carbon film 4 may be configured to be within a range of 0.5 µm to 20 µm inclusive.
Inventors:
Takuya Ozaki
Hiroyuki Sugiura
Hiroyuki Sugiura
Application Number:
JP2017532568A
Publication Date:
July 08, 2020
Filing Date:
July 29, 2016
Export Citation:
Assignee:
Nippon Piston Ring Co., Ltd.
International Classes:
F16J9/26; C22C38/20; C23C14/06; F02F5/00
Domestic Patent References:
| JP5208806A | ||||
| JP2013108156A |
Foreign References:
| DE102010052971A1 | ||||
| WO2014133095A1 |
Attorney, Agent or Firm:
Shunichi Yoshimura