PISTON RING AND MANUFACTURING METHOD THEREFOR |
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| 申请号 | US15739344 | 申请日 | 2016-07-29 | 公开(公告)号 | US20180180181A1 | 公开(公告)日 | 2018-06-28 |
| 申请人 | NIPPON PISTON RING CO., LTD.; | 发明人 | Takuya OZAKI; Hiroyuki SUGIURA; | ||||
| 摘要 | 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 sp2 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. | ||||||
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