Title:
ピストンリング及びその製造方法
Document Type and Number:
Japanese Patent JP6557342
Kind Code:
B2
Abstract:
To provide a piston ring comprising a hard carbon film that is easy to form and exhibits excellent adhesion and wear resistance, and a manufacturing method therefor. The above-described problem is solved by means of a piston ring comprising a hard carbon film 50 formed on at least an outer peripheral sliding surface 11 of a piston ring base material 1, wherein the hard carbon film 50 is a laminated film comprising a plurality of layers, including an upper layer 5 with a lamination pitch within a range of 3 nm to 50 nm inclusive, a middle layer 4 with a lamination pitch less than that of the upper layer 5, and a lower layer 3 with a lamination pitch within the same range as that of the upper layer 5 and greater than that of the middle layer 4. This hard carbon film 50 may be configured to have an sp 2 component ratio within a range of 35% 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.
Inventors:
Takuya Ozaki
Hiroyuki Sugiura
Hiroyuki Sugiura
Application Number:
JP2017532569A
Publication Date:
August 07, 2019
Filing Date:
July 29, 2016
Export Citation:
Assignee:
Nippon Piston Ring Co., Ltd.
International Classes:
F16J9/26; C23C14/06
Domestic Patent References:
| JP2000128516A | ||||
| JP2000320673A | ||||
| JP200326414A | ||||
| JP201586967A |
Foreign References:
| WO2014133095A1 |
Attorney, Agent or Firm:
Shunichi Yoshimura